Texas Instruments ADS8028EVM-PDK User manual

User's Guide
SBAU198–April 2012
ADS8028EVM-PDK
Figure 1. ADS8028EVM-PDK
This user's guide describes the characteristics, operation, and use of the ADS8028EVM-PDK. This
evaluation module and performance development kit (EVM-PDK) is an evaluation system for the
ADS8028, a 12-bit, 1-MSPS, 8-channel, successive approximation register (SAR) analog-to-digital
converter (ADC). The EVM-PDK allows evaluation of all aspects of the ADS8028 device.
This document includes an EVM QuickStart section, hardware and software details, bill of materials, and
schematic.
The following related documents are available through the Texas Instruments web site at
http://www.ti.com.
Table 1. EVM-Compatible Device Data Sheets
Device Literature Number
ADS8028 SBAS549
OPA836 SLOS712
REF5025 SBOS410
ADCPro is a trademark of Texas Instruments.
Microsoft Windows is a registered trademark of Microsoft, Corporation.
SPI is a trademark of Motorola.
All other trademarks are the property of their respective owners.
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Contents
1 EVM Overview ............................................................................................................... 3
2 EVM Setup ................................................................................................................... 4
3 ADS8028EVM Hardware Details .......................................................................................... 6
4 Using the ADS8028EVM-PDK with ADCPro ........................................................................... 11
5 Schematics and Bill of Materials ........................................................................................ 13
List of Figures
1 ADS8028EVM-PDK......................................................................................................... 1
2 Jumper Locations and Default Settings.................................................................................. 4
3 Headers and Pin Numbers ................................................................................................ 6
4 Analog Input Header Schematic .......................................................................................... 7
5 Digital Interface Header Schematic....................................................................................... 8
6 Power Header Schematic ................................................................................................. 9
7 EVM Voltage Reference Schematic .................................................................................... 10
8 ADCPro: ADS8028EVM Panel .......................................................................................... 11
9 ADCPro: Channel Selection Tab ........................................................................................ 12
10 ADCPro: Controls Tab.................................................................................................... 12
List of Tables
1 EVM-Compatible Device Data Sheets ................................................................................... 1
2 Related Documents......................................................................................................... 3
3 Default Jumper Configurations............................................................................................ 4
4 Critical Connections ........................................................................................................ 6
5 ADS8028EVM Bill of Materials .......................................................................................... 14
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1 EVM Overview
The ADS8028EVM-PDK is designed to evaluate the ADS8028. The ADS8028 is a 12-bit, 8-channel,
multiplexed, SAR ADC, with a maximum throughput rate of 1 MSPS. The ADS8028 also offers an internal
2.5-V voltage reference and internal temperature sensor with 0.25°C resolution. The ADS8028EVM allows
access to every pin of the converter and makes it easy to connect the ADS8028 SPI™-compatible serial
interface to any host microprocessor or TI DSP based system with 1.8-V, 3.3-V, or 5-V logic capability.
The ADS8028EVM-PDK combines the ADS8028EVM daughtercard with the digital sensor processor
(DSP)-based MMB0 motherboard and ADCPro™ evaluation software for complete evaluation of the
ADS8028.
1.1 Features
ADS8028EVM Features
• Easy-to-use ADCPro evaluation software for Microsoft Windows®operating systems
• Built-in analysis tools for ADCPro, including scope, FFT, and histogram displays
• Simple device operation with full control of single 16-bit control register
• Data collection to text files
• 1.8-V, 3.3-V, or 5-V logic compatible with 16-bit, 20-MHz SPI Interface
• Contains all support circuitry needed for the ADS8028:
– Voltage reference options: ADS8028 (2.5 V) internal reference, on-board REF5025 (2.5 V)
reference, or external reference
– Two on-board OPA836 (205-MHz unity-gain bandwidth / 1-mA quiescent current) ADC input drivers
– Power supplied by MMB0 motherboard
• Compatible with the TI modular EVM system
ADS8028EVM-PDK Features
The ADS8028EVM-PDK includes the ADS8028EVM board with the DSP-based MMB0 motherboard, that
can be used with ADCPro to quickly evaluate the device.
This manual covers the operation of the ADS8028EVM-PDK. Throughout this document, the abbreviation
EVM and the term evaluation module are synonymous with the ADS8028EVM.
1.2 Related Documentation from Texas Instruments
The related documents listed in Table 2 are available for download through the Texas Instruments web
site at www.ti.com.
Table 2. Related Documents
Device Literature Number
ADS8028 SBAS549
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EVM Setup www.ti.com
2 EVM Setup
This section is a quick guide to begin evaluating the ADS8028EVM with ADCPro.
2.1 Default Jumper Configuration
Figure 2 shows the location of jumpers on the EVM and their respective factory default settings.
Figure 2. Jumper Locations and Default Settings
Table 3 lists the jumpers on the ADS8028EVM and their factory default settings.
Table 3. Default Jumper Configurations
Jumper Default Position Description
J-1 Open 1.8-V logic not selected
J-3 Short 3.3-V logic selected (BVDD = 3.3 V)
J-5 Open 5-V logic not selected
J-CS Pins 1-2 (Down) MMB0 FSX pin connected to CS
J-REF Pins 2-3 (Right) Allows for external voltage reference input or internal voltage reference output
CAUTION
Only one of the digital interface jumpers (J-1, J-3, or J-5) should be shorted at a
time to prevent large reverse currents that could potentially damage voltage
regulators on the MMB0 motherboard.
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2.2 ADS8028EVM-PDK Kit Operation
To prepare to evaluate the ADS8028 with the ADS8028EVM-PDK, complete the following steps:
1. Verify the ADS8028EVM jumper settings from the factory as shown in Figure 2 and also listed in
Table 3.
2. Install ADCPro and the ADS8028EVM plug-in software. Complete hardware connections and driver
installation as per the ADCPro HW/SW Installation Manual. Use the following jumper settings on the
MMB0 to configure power with the ac adapter.
• MMB0 J12 →Short (power supplied to the MMB0 through MMB0 J2 jack)
• MMB0 J13A →Open (+VA supply is not used on the ADS8028EVM)
• MMB0 J13B →Short (power supplied to the ADS8028EVM through the MMB0 J5 header)
• No additional power connections are required
3. Plug the ADS8028EVM onto the MMB0 motherboard. The female portion of J-ANALOG, J-DIGITAL,
and J-POWER on the bottom of the EVM align with male connectors J7, J4, and J5 (respectively) on
the MMB0.
4. Connect the included USB cable to J1 on the MMB0 and to an unused USB port on the computer with
ADCPro installed.
5. Connect the included ac adapter to the MMB0.
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Pin 1 2
3 4
6
8
5
7
9 10
12
14
11
13
15 16
18
20
17
19
Pin 1 2
3 4
6
8
5
7
9 10
12
14
11
13
15 16
18
20
17
19
Pin 1
2 4 6 8 10
3 5 7 9
J-ANALOG.1 J-DIGITAL.1
J-POWER.1
ADS8028EVM Hardware Details www.ti.com
3 ADS8028EVM Hardware Details
Figure 3 shows the location of headers J-ANALOG, J-DIGITAL, and J-POWER and their assigned pin
numbers. The notation J-NAME.<#> is used in this user's guide for identifying header pins. For example,
J-ANALOG.1 refers to pin 1 on the J-ANALOG header.
Figure 3. Headers and Pin Numbers
Table 4 provides a quick summary of the connections required for operation of the ADS8028. The purpose
of the MMB0 motherboard is to provide power and SPI communication to the ADS8028EVM. Analog
inputs of interest must be applied to the ADS8028EVM by the user. For a complete list of connections and
pins, refer to the ADS8028EVM schematic in Section 5.2.
Table 4. Critical Connections
Function Header and Pin Pin Name Description
CS J-DIGITAL.7 FSX Chip select; active low logic input
SCLK J-DIGITAL.3 CLKX SCLK
SPI DIN J-DIGITAL.11 DX Data In
DOUT J-DIGITAL.13 DR Data Out
TM_BUSY J-DIGITAL.15 INT Busy output; high during temperature conversion
1.8V J-POWER.7 +1.8VD Digital interface supply (BVDD)(1)
3.3V J-POWER.9 +3.3VD Digital interface supply (BVDD)(1)
5.0V J-POWER.10 +5VD Digital interface supply (BVDD)(1)
Power 5.0V (AVDD) J-POWER.3 +5VA Analog operation supply (AVDD)
J-POWER.5 and DGND and
GND Digital and Analog supply grounds(2)
J-POWER.6 AGND
Channels 0 and 1 J-ANALOG.1-4 — Analog Inputs (Buffered)(3)
Analog inputs Channels 2 to 7 J-ANALOG.5-16 — Analog Inputs(3)
(1) Only one digital supply connection (BVDD) is required when evaluating the ADS8028EVM as a stand-alone board. Check that
the corresponding jumper (J-1, J-3, or J-5) is correctly selected to power the ADS8028 digital interface.
(2) AGND and DGND are shorted on the ADS8028EVM.
(3) All ADS8028 analog inputs are single-ended and connect between the even and odd pins on the J-ANALOG header. All odd
pins on J-ANALOG are connected to AGND.
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3.1 Analog Inputs
The ADS8028 provides eight single-ended input channels plus an internal temperature sensor. The eight
analog input channels to the ADS8028 (AIN0 to AIN7) are connected to J-ANALOG on the ADS8028EVM.
Channels 0 and 1 are buffered converter inputs. The OPA836 is configured as a unity-gain buffer on these
channels. Channels 2 to 7 connect directly to the converter with an option to add an RC filter before the
converter input. Figure 4 shows the EVM schematic portion of the analog inputs. All discrete resistors and
capacitors shown in Figure 4 are size 0603 and can be modified to adjust circuit gain and filtering. Note
that not all components shown in Figure 4 are installed and have values "NI" (not installed).
Optionally, the user can add an SMA connector at J-SMA and use an SMA input for channels 0 and 1 if
an SMA connection is more convenient. RS0 and RS1 resistors select the SMA input channel. If the SMA
input has a 50-Ωsource impedance, R10 and other input resistors can be modified for impedance
matching, otherwise they can provide signal attenuation and input current limiting.
Figure 4. Analog Input Header Schematic
NOTE: All odd pins on J-ANALOG connect to GND. Therefore, all analog input connections can be
easily made across even and odd pin numbers (The channel 0 input connects to J-
ANALOG.1-2, channel 1 input connects to J-ANALOG.3-4, etc.).
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3.2 Digital Control
The SPI digital control signals are applied directly to the J-DIGITAL header on the ADS8028EVM. When
using the ADS8028EVM-PDK (the combination of the ADS8028EVM, MMB0 motherboard, and ADCPro
software), these signals are supplied by the MMB0 motherboard through J4. If the ADS8028EVM is
instead evaluated as a stand-alone board, these signals must be supplied by another microcontroller or
processor according to the timing characteristics in the ADS8028 data sheet.
Figure 5 shows the schematic connections to the J-DIGITAL header. The CS signal can be routed to J-
DIGITAL.1 or J-DIGITAL.7 (default) through the J-CS jumper. Ensure that the J-CS jumper is positioned to
route CS to J-DIGITAL.7 (short pins J-CS.1-2) for proper SPI communication when using the
ADS8028EVM-PDK. Additionally, the S1 push-button switch allows the user to manually reset and power-
down the ADS8028 and OPA836 op amps on the ADS8028EVM while the button is held. When the button
is released, the ADS8028 powers up with default conditions.
Figure 5. Digital Interface Header Schematic
NOTE: By default, the J-CS jumper on the ADS8028EVM is shorted between pins J-CS.1-2. This
setting is required for proper SPI communication between the MMB0 motherboard and the
ADS8028.
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3.3 Power Supply
The ADS8028EVM requires two power-supply rails: one 5-V analog supply (AVDD) and a configurable
digital interface (BVDD). Three selectable voltages are available for the digital interface to make the EVM
compatible with different logic levels. Jumpers J-1, J-3, and J-5 on the ADS8028EVM select 1.8-V, 3.3-V,
or 5-V BVDD digital interface voltages, respectively. Refer to Table 3 for the ADS8028EVM jumper
functions and default settings. The default jumper settings of J-1 (open), J-3 (short), and J-5 (open) are
recommended when using the ADS8028EVM with the MMB0 3.3-V logic.
Power rails are supplied to the ADS8028EVM through the J-POWER header. If the ADS8028EVM is being
evaluated as a stand-alone board, the user must supply power to the J-POWER header by direct
connections to a power supply. Otherwise, the MMB0 motherboard supplies the ADS8028EVM with power
through J-5 when the ADS8028EVM daughtercard is mounted on the MMB0. Check the MMB0 jumper
settings listed in the ADS8028EVM-PDK Kit Operation section if the ADS8028EVM is not receiving power
when connected to the MMB0 motherboard. Figure 6 shows a schematic of J-POWER header
connections on the ADS8028EVM.
Figure 6. Power Header Schematic
CAUTION
Do not apply voltages that the exceed the absolute maximum ratings of the
installed components. The absolute maximum supply voltage of the OPA836
limits the maximum analog supply voltage of the ADS8028EVM to 5.5 V. The
digital supply voltage should not exceed the analog supply voltage.
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3.4 Voltage Reference
The ADS8028EVM allows the user flexibility to select different voltage reference sources for the ADS8028.
Options include the:
• ADS8028 internal 2.5-V voltage reference,
• Onboard REF5025 2.5-V reference, or
• External reference source
When the ADS8028 powers up, the internal 2.5-V reference is selected as the reference source by
default. To use an external reference source, the internal voltage reference must be disabled by
performing a serial interface write to the ADS8028 control register to update bit 2. When using an external
source, shorting pins J-REF.1-2 uses the REF5025 external 2.5-V reference. If a reference voltage other
than 2.5 V is needed, the REF5025 can be replaced with any other reference in the REF50xx family.
Shorting pins J-REF.2-3 connects J-ANALOG.20 to the ADS8028 reference input. This short allows the
user to output the internal ADS8028 voltage reference to another circuit or allows a external reference
voltage to be applied to the ADS8028 reference input when the internal reference is disabled. The
allowable voltage range for an external voltage reference is 1 V to AVDD (5 V when the ADS8028EVM is
used with the MMB0).
Figure 7. EVM Voltage Reference Schematic
CAUTION
The user should avoid connecting any external voltage reference to the
ADS8028 before a serial write to the ADS8028 control register disables the
internal reference source. Providing an external source prior to this
communication draws additional current from the external source. The
ADS8028 internal protection circuitry limits this current to 20 mA.
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4 Using the ADS8028EVM-PDK with ADCPro
This section covers the use of the ADS8028EVM-PDK plug-in for ADCPro. For general ADCPro software
use and instructions, refer to the ADCPro User's Guide.
The ADS8028EVM-PDK plug-in for ADCPro provides complete control over all ADS8028 settings. It
consists of a tabbed interface (see Figure 8), with different functions available on each tab. The tabs are:
• Channel Selection
• Controls
• About
The ADS8028EVM settings can be adjusted when not acquiring data. During acquisition, all controls are
disabled and settings may not be changed. When a setting is changed on the ADS8028EVM plug-in, it
takes effect immediately. The effect of some settings, such as the Channel Selection, are not detected
until the user starts acquiring data from the ADS8028. The option to acquire data is disabled until both an
EVM plug-in and Test plug-in have been loaded from the respective drop-down file menus.
ADS8028EVM settings correspond to settings described in the ADS8028 data sheet.
4.1 Top-Level Controls
The ADCPro top-level controls for the ADS8028EVM-PDK plug-in include the sample rate and standby
controls. The Sample Rate indicator, in the upper right corner of the plug-in interface, is always visible and
can be modified by the user by typing in a different value. The Standby control, in the lower left corner,
places the ADS8028 in standby mode when pressed. The user must exit standby mode to make the data
acquisition option available again. The top-level controls are highlighted in Figure 8.
Figure 8. ADCPro: ADS8028EVM Panel
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4.2 Channel Selection Tab
The ADS8028 can acquire data from one to eight channels, sequentially. The Channel Select tab provides
the control to select which channels are sampled. A channel is selected to be sampled if a check mark is
seen in the box corresponding to the channel number. Channels are listed sequentially, starting with
channel 0 (AIN0) at the top of the list and channel 7 (AIN7) at the bottom. Figure 9 shows where to select
channels in the Channel Select tab.
Figure 9. ADCPro: Channel Selection Tab
NOTE: If multiple channels are selected for acquisition, then each channel is sampled at a slower
rate, given by the sampling rate divided by the number of channels selected for acquisition.
4.3 Controls Tab
The Controls tab allows for reference source selection and operation of the ADS8028 internal temperature
sensor. Figure 10 highlights the controls the user can modify on the Controls tab.
Figure 10. ADCPro: Controls Tab
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www.ti.com Schematics and Bill of Materials
The Reference Source control selects between the ADS8028 internal voltage reference (INT) and an
external voltage reference source (EXT). Selecting EXT disables the internal voltage reference and allows
the user to specify the applied reference voltage in the Reference Voltage indicator to display the correct
voltage output values.
The Temperature Averaging control configures the ADS8028 to average eight temperature
measurements.
The Read Temp button returns the output of the internal ADS8028 temperature sensor reading. The
output code is displayed in the Internal Temperature Data indicator and the corresponding temperature
value in degrees Celsius is displayed in the Internal Temperature indicator.
4.4 About Tab
The About tab provides information on the EVM hardware and software versions.
The plug-in version is the software version of the ADCPro plug-in. The firmware version is the firmware
version loaded and running on the processor.
5 Schematics and Bill of Materials
A complete schematic for the ADS8028EVM is included in this user's guide. Refer to Table 5 for a bill of
materials. Gerber files are available on request. Please e-mail [email protected] or E2E Community Forums
and ask for details on how to receive the files.
5.1 Bill of Materials
NOTE: All components should be compliant with the European Union Restriction on Use of
Hazardous Substances (RoHS) Directive. Some part numbers may be either leaded or
RoHS. Verify that purchased components are RoHS-compliant. (For more information about
TI's position on RoHS compliance, see the Design Support section at http://www.ti.com.)
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Schematics and Bill of Materials www.ti.com
Table 5. ADS8028EVM Bill of Materials
Item No. Qty Value Ref Des Description Manufacturer Part Number
1 1 — Printed Circuit Board, 3.2 In x 1.7 In x 0.062 In Any 6544351
2 2 430 pF CIN0, CIN1 Capacitor, C0G Ceramic, 50V, 5%, 0603 Murata GRM1885C1H431JA01D
3 5 1 µF C1-C3, C12, C13 Capacitor, X7R Ceramic, 25V, 10%, 0603 Murata GRM188R71E105KA12D
4 3 10 µF C4, C5, C14 Capacitor, X7R Ceramic, 25V, 10%, 1206 Taiyo Yuden TMK316B7106KL-TD
5 0 — C6, C8, C11, CIN2-CIN7 Not Installed — —
6 2 0.1 µF C7, C10 Capacitor, X7R Ceramic, 25V, 10%, 0603 Murata GRM188R71E104KA01D
7 1 47 pF C9 Capacitor, C0G Ceramic, 50V, 5%, 0603 Murata GRM1885C1H470JA01D
8 0 — C15 Not Installed — —
9 3 — J-1, J-3, J-5 CONN HEADER 2POS .100" SGL GOLD Samtec TSW-102-07-L-S
10 2 — J-ANALOG(A), J-DIGITAL(A) CONN HEADER 20POS .100" SMD TIN Samtec TSM-110-01-T-DV-P
11 2 — J-ANALOG(B), J-DIGITAL(B) CONN RECPT 20POS .100" SMT GOLD Samtec SSW-110-22-F-D-VS-K
12 1 — J-POWER(A) CONN HEADER 10POS .100" DBL SMD Samtec TSM-105-01-T-DV-P
13 1 — J-POWER(B) CONN RECPT 10POS .100" SMT GOLD Samtec SSW-105-22-F-D-VS-K
14 2 — J-CS, J-REF CONN HEADER 3POS .100" SGL GOLD Samtec TSW-103-07-L-S
15 0 — J-SMA Not Installed — —
16 2 24.9 ΩRIN0, RIN1 Resistor, Chip, 1/10W, 1%, 0603 Yageo RC0603FR-0724R9L
17 2 2.7 kΩRE3, RE4 Resistor, Chip, 1/10W, 1%, 0603 Yageo RC0603FR-072K7L
18 5 47 ΩR1-R5 Resistor, Chip, 1/10W, 1%, 0603 Yageo RC0603FR-0747RL
19 1 10 kΩR6 Resistor, Chip, 1/10W, 1%, 0603 Yageo RC0603FR-0710KL
20 2 100 ΩR7, R8 Resistor, Chip, 1/10W, 1%, 0603 Yageo RC0603FR-07100RL
21 14 0 ΩR9, R12, R17, R19-R21, Resistor, Chip, 1/10W, < 0.05Ω, 0603 Yageo RC0603JR-070RL
RIN2-RIN7, RS0, RE1
22 0 — R10, R11, R16, RE2, RS1 Not Installed — —
23 1 1 ΩR18 Resistor, Chip, 1/10W, 1%, 0603 Yageo RC0603FR-071RL
24 2 2 kΩR13, R15 Resistor, Chip, 1/10W, 1%, 0603 Panasonic ERJ-3EKF2001V
25 1 1 kΩR14 Resistor, Chip, 1/10W, 1%, 0603 Yageo RC0603FR-071KL
26 1 — S1 Tactile Switch, 6x6 mm, Surface Mount TE Connectivity FSM4JSMATR
27 1 — U1 IC, ADC, SAR, 12-Bit, 1 MSPS, 8-Channel, RTJ-20 Texas Instruments ADS8028IRTJT
28 2 — U2, U3 IC, OPAMP, VFB, RRO, 205MHZ, SOT23-6 Texas Instruments OPA836IDBVT
29 1 — U4 IC, Precision Voltage Reference, 2.5V, SO-8 Texas Instruments REF5025AID
30 1 — U5 IC, EEPROM, 256KBIT, 400KHZ, TSSOP-8 Microchip 24AA256-I/ST
Technology
31 11 — — Shunt, 100-mil, Black 3M 969102-0000-DA
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1/10/2012
C
4
ABCD
Date
E
Sheet of
F
4 2
1
Title
3
1
ABCDE
Size Number
F
2
Filename
Drawn by
3
Engineer
Rev
1
<Number>
ADS8028_A.sch 1
Texas Instruments
ADS8028 EVM Schematic
Christopher Hall
June 27, 2011
A
Christopher Hall
(NOT A PIN)
Thermal PAD
Signal Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
CNTL
GPIO0
CLKX
DGND
CLKR
GPIO1
FSX
GPIO2
FSR
DGND
DX
GPIO3
DR
GPIO4
*INT
SCL
TOUT
DGND
GPIO5
SDA
Digital Connector
Connect analog &
NOTES:
EEPROM Digital Interface
Short ADC's
AGND & BGND
Reference
Reference Selector
+1.8V Logic
+3.3V Logic
+5V Logic
Power Connector
Power
Signal Pin #
1 2 3 4 5 6 7 8 9 10
+VA -VA +5VA -5VA DGND AGND +1.8VD VD1 +3.3VD +5VD
BVDD Selector
/CS Selector
Optional Filter
Edge Damping
(optional)
digital grounds
Signal Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
AGND
A0+
AGND
A1+
AGND
A2+
AGND
A3+
AGND
A4+
AGND
A5+
AGND
A6+
VCOM
A7+
AGND
REF-
AGND
REF+
Analog Connector Ground unused channels with
jumper to avoiding floating inputs
Analog Inputs
Single-Ended Input
0.1V* -> +2.5V
Bipolar Input
-2V -> +2V
SMA Input
GPIO0
CNTL FSX
REF5025 INT/EXT
* Limited by op amp output swing
Selecting "INT/EXT":
- Outputs internal reference or
- Inputs an external reference
0.25V -> +2.25V
Remove R10 and connect ammeter Remove R20and connect ammeter
to measure analog power consumption to measure digital power consumption
(MMB0 uses "FSX" for "/CS")
R1 47 R2 47 R3 47 R4 47 R5 47
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
J-DIGITAL
1
2
3
J-CS
1AIN3
2AIN4
3AIN5
4AIN6
5AIN7
6AGND
7REF
8NC
9DGND
10 AVDD
11
CS
12
TM_BUSY
13
DIN
14
DOUT
15
SCLK
16
DVDD
17
PD-RST
18
AIN0
19
AIN1
20
AIN2
21
GND
U1
ADS8028RTJ
C2 1u
R20 0R210
C1
1u
C3
1u
1A0
2A1
3A2
4VSS 5
SDA
6
SCL
7
WP
8
VCC
U5
24AA256-I/ST
RE2
NI
RE1 0
1DNC
2VIN
3TEMP
4GND 5
TRIM
6
VOUT
7
NC
8
DNC
U4
REF5025AID
C12
1u
C13
1u
C14
10u
R18 1
21 J-5
21 J-1
21 J-3
C5
10u
R19 0
C15
NI
RE3
2.7k
RE4
2.7k
1
2
3
J-REF
C4
10u
R6 10k
1
2
3
4
5
6
7
8
9
10
J-POWER
RIN2 0
CIN2 NI
RIN6 0
CIN6 NI
RIN5 0
CIN5 NI
RIN4 0
CIN4 NI
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
J-ANALOG
RIN3 0
CIN3 NI
R9 0RIN024.9
CIN0 430p
3+ 4-
1
OUT
2
VS-
6
VS+
5
PD
U2
OPA836IDBV
AIN0
R14 1k
R15 2k
RIN1 24.9
CIN1 430p
R13 2k
3+ 4-
1
OUT
2
VS-
6
VS+
5
PD
U3
OPA836IDBV
AIN1
C7
0.1u
C10
0.1u
S1
SW_FSM4JSMA
J-SMA
RS0
0
RS1
NI
VREF
C11 NI
R17 0 R12 0
C8 NI
R10 NI
C6
NI
C9
47p
R11 NI R16 NI
R8 100
R7 100
RIN7 0
CIN7 NI
DOUT TM_BUSY
/CS
/CS SCLK DIN
DIN
DOUT
/PD_/RST
SCLK
TM_BUSY
AIN0
AIN1
AIN2
AIN6 AIN5 AIN4 AIN3
BVDD AVDD
BVDD
EXT_REF
AVDD
AVDD
VREF
VREF
BVDD
AIN7
SCL SDA
SCL
SDA
/PD_/RST
BVDD
EXT_REF
/PD_/RST
AVDD
AIN0
/PD_/RST
AVDD
AIN1
AIN6 AIN5 AIN4 AIN3 AIN2 AIN7
AVDD
www.ti.com Schematics and Bill of Materials
5.2 Schematic
15
SBAU198–April 2012 ADS8028EVM-PDK
Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated

Evaluation Board/Kit Important Notice
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have
electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental
measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does
not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling
(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from
the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER
AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or
services described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This
notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or
safety programs, please contact the TI application engineer or visit www.ti.com/esh.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
combination in which such TI products or services might be or are used.
FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio
frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are
designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may
cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may
be required to correct this interference.
EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of 3.3 V to 5 V and the output voltage range of 0 V to 5 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions
concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.
Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than +30°C. The EVM is designed to operate
properly with certain components above +85°C as long as the input and output ranges are maintained. These components include but are
not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified
using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2012, Texas Instruments Incorporated

EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS
Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims
arising from the handling or use of the goods.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from
the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO
BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH
ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES.
Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This
notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety
programs, please visit www.ti.com/esh or contact TI.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
combination in which such TI products or services might be or are used. TI currently deals with a variety of customers for products, and
therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design,
software performance, or infringement of patents or services described herein.
REGULATORY COMPLIANCE INFORMATION
As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal
Communications Commission (FCC) and Industry Canada (IC) rules.
For EVMs not subject to the above rules, this evaluation board/kit/module is intended for use for ENGINEERING DEVELOPMENT,
DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end product fit for general consumer
use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing
devices pursuant to part 15 of FCC or ICES-003 rules, which are designed to provide reasonable protection against radio frequency
interference. Operation of the equipment may cause interference with radio communications, in which case the user at his own expense will
be required to take whatever measures may be required to correct this interference.
General Statement for EVMs including a radio
User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and
power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local
laws governing radio spectrum allocation and power limits for this evaluation module. It is the user’s sole responsibility to only operate this
radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this are strictly prohibited and
unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory
authorities, which is responsibility of user including its acceptable authorization.
For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant
Caution
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the
equipment.
FCC Interference Statement for Class A EVM devices
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the interference at his own expense.

FCC Interference Statement for Class B EVM devices
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
For EVMs annotated as IC – INDUSTRY CANADA Compliant
This Class A or B digital apparatus complies with Canadian ICES-003.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the
equipment.
Concerning EVMs including radio transmitters
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this
device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired
operation of the device.
Concerning EVMs including detachable antennas
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain
approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should
be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.
This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum
permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain
greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.
Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada.
Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de
l'utilisateur pour actionner l'équipement.
Concernant les EVMs avec appareils radio
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est
autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout
brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Concernant les EVMs avec antennes détachables
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain
maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à
l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente
(p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.
Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel
d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans
cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.
SPACER
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SPACER

【【Important Notice for Users of this Product in Japan】】
This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan
If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product:
1. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and
Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of
Japan,
2. Use this product only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this
product, or
3. Use of this product only after you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with
respect to this product. Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note
that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan.
Texas Instruments Japan Limited
(address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan
http://www.tij.co.jp
【ご使用にあたっての注】
本開発キットは技術基準適合証明を受けておりません。
本製品のご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。
1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用いただく。
2. 実験局の免許を取得後ご使用いただく。
3. 技術基準適合証明を取得後ご使用いただく。
なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。
上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。
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http://www.tij.co.jp
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EVALUATION BOARD/KIT/MODULE (EVM)
WARNINGS, RESTRICTIONS AND DISCLAIMERS
For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished
electrical equipment and not intended for consumer use. It is intended solely for use for preliminary feasibility evaluation in
laboratory/development environments by technically qualified electronics experts who are familiar with the dangers and application risks
associated with handling electrical mechanical components, systems and subsystems. It should not be used as all or part of a finished end
product.
Your Sole Responsibility and Risk. You acknowledge, represent and agree that:
1. You have unique knowledge concerning Federal, State and local regulatory requirements (including but not limited to Food and Drug
Administration regulations, if applicable) which relate to your products and which relate to your use (and/or that of your employees,
affiliates, contractors or designees) of the EVM for evaluation, testing and other purposes.
2. You have full and exclusive responsibility to assure the safety and compliance of your products with all such laws and other applicable
regulatory requirements, and also to assure the safety of any activities to be conducted by you and/or your employees, affiliates,
contractors or designees, using the EVM. Further, you are responsible to assure that any interfaces (electronic and/or mechanical)
between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to
minimize the risk of electrical shock hazard.
3. You will employ reasonable safeguards to ensure that your use of the EVM will not result in any property damage, injury or death, even
if the EVM should fail to perform as described or expected.
4. You will take care of proper disposal and recycling of the EVM’s electronic components and packing materials.
Certain Instructions. It is important to operate this EVM within TI’s recommended specifications and environmental considerations per the
user guidelines. Exceeding the specified EVM ratings (including but not limited to input and output voltage, current, power, and
environmental ranges) may cause property damage, personal injury or death. If there are questions concerning these ratings please contact
a TI field representative prior to connecting interface electronics including input power and intended loads. Any loads applied outside of the
specified output range may result in unintended and/or inaccurate operation and/or possible permanent damage to the EVM and/or
interface electronics. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the
load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures
greater than 60°C as long as the input and output are maintained at a normal ambient operating temperature. These components include
but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors which can be identified using the
EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during normal operation, please
be aware that these devices may be very warm to the touch. As with all electronic evaluation tools, only qualified personnel knowledgeable
in electronic measurement and diagnostics normally found in development environments should use these EVMs.
Agreement to Defend, Indemnify and Hold Harmless. You agree to defend, indemnify and hold TI, its licensors and their representatives
harmless from and against any and all claims, damages, losses, expenses, costs and liabilities (collectively, "Claims") arising out of or in
connection with any use of the EVM that is not in accordance with the terms of the agreement. This obligation shall apply whether Claims
arise under law of tort or contract or any other legal theory, and even if the EVM fails to perform as described or expected.
Safety-Critical or Life-Critical Applications. If you intend to evaluate the components for possible use in safety critical applications (such
as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, such as devices
which are classified as FDA Class III or similar classification, then you must specifically notify TI of such intent and enter into a separate
Assurance and Indemnity Agreement.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2012, Texas Instruments Incorporated