Texas Instruments ADS1241MEVM User manual

User's GuideSBAU106 – October 2004
ADS1241MEVM
This user's guide describes the characteristics, operation, and use of theADS1241MEVM. This EVM is a 24-bit analog-to-digital converter evaluation module. Acomplete circuit description, schematic diagram, and bill of materials are included.
The following related documents are available through the Texas Instruments web siteat www.ti.com .
EVM-Compatible Device Data Sheets
LiteratureDevice Number
ADS1241 SBAS173REF1004 SBVS002OPA350 SBOS099SN74LVC1G126 SCES224
Contents1 EVM Overview ............................................................................................................... 22 Analog Interface ............................................................................................................ 23 Digital Interface ............................................................................................................. 34 Power Supplies ............................................................................................................. 35 EVM Operation .............................................................................................................. 56 EVM Bill of Materials and Schematic ................................................................................... 7
List of Figures
1ADS1241MEVM Switch and Jumper Locations ...................................................................... 5
List of Tables
1Analog Interface Pinout ................................................................................................... 22Digital Interface Pinout .................................................................................................... 33Power Supply Pinout ...................................................................................................... 34Reference Selection Options - S6 and S7 ............................................................................. 45Input Selection Options - S1 through S4 .............................................................................. 56AINCOM Selection Options - S5 ......................................................................................... 57ADS1241MEVM Bill of Materials ......................................................................................... 7
Speedy33 is a trademark of Hyperception, Inc..
1SBAU106 – October 2004 ADS1241MEVM

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1 EVM Overview
1.1 Features
1.2 Introduction
2 Analog Interface
EVM Overview
•Full-featured evaluation board for the ADS1241 24-bit analog-to-digital converter•On-board reference and oscillator circuits•
Modular design for use with a variety of DSP and microcontroller interface boards
The ADS1241MEVM is in Texas Instruments' modular EVM form factor, which allows directevaluation of the ADS1241 performance and operating characteristics, and eases softwaredevelopment and system prototyping. This EVM is compatible with the 5-6K Interface Board(SLAU104) from Texas Instruments and additional third-party boards such as the HPA449demonstration board from SoftBaugh, Inc. (www.softbaugh.com ) and the Speedy33™ fromHyperception, Inc. (www.hyperception.com ).
For maximum flexibility, the ADS1241MEVM is designed for easy interfacing to multiple analogsources. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide aconvenient 10-pin, dual-row, header/socket combination at J1. This header/socket providesaccess to the analog input pins of the ADS1241. Consult Samtec at www.samtec.com or call1-800-SAMTEC-9 for a variety of mating connector options.
Table 1. Analog Interface Pinout
Pin Number Signal Description
J1.1 AN0- ADS1241 AN1J1.2 AN0+ ADS1241 AN0J1.3 AN1- ADS1241 AIN3J1.4 AN1+ ADS1241 AIN2J1.5 AN2- ADS1241 AIN5J1.6 AN2+ ADS1241 AIN4J1.7 AN3- ADS1241 AIN7J1.8 AIN3+ ADS1241 AIN6J1.10 AIN4+ ADS1241 AINCOMJ1.15 VCOM Tied to onboard 2.5V referenceJ1.18 REF(-) External reference source low sideJ1.20 REF(+) External reference source input (2.5V NOM)J1.9-J1.19 (odd) GND Analog ground connections (except J1.15)J1.12-J1.16 (even) Unused
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3 Digital Interface
4 Power Supplies
Digital Interface
The ADS1241MEVM is designed to easily interface with multiple control platforms. Samtec partnumbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin,dual-row, header/socket combination at J2. This header/socket provides access to the digitalcontrol and serial data pins of the ADS1241. Consult Samtec at www.samtec.com or call1-800-SAMTEC-9 for a variety of mating connector options.
Table 2. Digital Interface Pinout
Pin Number Signal Description
J2.1 DSYNC Synchronization controlJ2.2 PWDN Power downJ2.3 SCLK Serial clockJ2.4 DGND Digital groundJ2.5 UnusedJ2.6 GPIO1 Oscillator kickstart (see Section 5.3.1.1 )J2.7 CS Chip select - Active low signal, enables data transfer. Frame sync on DSP host systems.J2.8 GPIO2 Oscillator kickstart enable (see Section 5.3.1.1 )J2.9 UnusedJ2.10 DGND Digital groundJ2.11 DIN Serial data input to ADS1241 from hostJ2.12 BUFEN Buffer enableJ2.13 DOUT Serial data output from ADS1241 to hostJ2.14 POL Serial clock polarityJ2.15 DRDY Data readyJ2.16 SCL I
2
C bus serial clockJ2.17 TOUT External clock input to ADS1241J2.18 DGND Digital groundJ2.19 RESET Resets ADS1241 deviceJ2.20 SDA I
2
C bus data line
J3 provides connection to the common power bus for the ADS1241MEVM. Power is supplied onthe pins listed in Table 3 .
Table 3. Power Supply Pinout
Signal Pin Number Signal
Unused 1 2 Unused+5VA 3 4 UnusedAGND 5 6 DGNDUnused 7 8 Unused+3.3VD 9 10 +5VD
When power is supplied to J3, J4 allows for either 3.3V of 5V to be applied to the digital sectionsof the ADS1241. J4 also provides for a method of measuring AVDD and DVDD supply currentsif the shunts on J4.1-2 and J4.3-4 are removed and a current meter is connected between theappropriate pins. See the schematic and Figure 1 for details.
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4.1 ADC Power
4.2 Stand-Alone Operation
4.3 Reference Voltage
Power Supplies
Power for the ADS1241 analog supply voltage (AVDD) comes from +5VA, which is suppliedthrough J3.3. The shunt from J4 pins 1 to 2 applies this supply to the ADS1241 device.The ADS1241 digital supply voltage (DVDD) is selected using J4. When a shunt is applied fromJ4 pins 5 to 6, +5VD is selected, and this power comes from J3.10. If a shunt is placed from J4pins 7 to 8 (the default factory setting), +3.3VD is selected, which is provided from J3.9. J4 pins9 and 10 provide a way to connect the analog and digital grounds; these pins are connected bydefault when the EVM is shipped from the factory.
CAUTIONVerify that all power supplies are within the safe operating limits shown onthe ADS1241 data sheet before applying power to the EVM. Note that ashunt should only be connected between J4 pins 7 and 8 OR pins 5 and 6,but never both; doing so would short the +3.3V supply to the +5V digitalsupply.
When used as a stand-alone EVM, the analog power can be applied to J4.1, referenced toJ4.10. DVDD can be applied to J4.3, referenced to J4.10. Note that this EVM uses only a singleground plane.
The ADS1241 requires an external voltage reference. Two switches, S6 and S7, select thesource of the reference for the ADS1241. An external reference may be supplied through J1 pin20 on the ADS1241MEVM. A 2.5V reference is provided on the EVM for convenience, or thesupply voltage may also be used as the device reference voltage. These different referencesources can be selected using S6 and S7, as shown in Table 4 . Note that the ADS1241reference is differential, so both VREF+ and VREF- pins may take on several voltages. Refer tothe ADS1241 data sheet.
CAUTIONVerify that the external reference voltage is within the safe operating limitsshown on the ADS1241 data sheet before applying power to the EVM.
Table 4. Reference Selection Options - S6 and S7
S6 Position S7 Position VREF+ VREF- Comment
Left Left External (J1.20) External (J1.18)Middle Left 2.5V External (J1.18)Right Left AVDD External (J1.18)Left Middle External (J1.20) GroundMiddle Middle 2.5V GroundRight Middle AVDD GroundLeft Right External (J1.20) 2.5V
This results in a 0VMiddle Right 2.5V 2.5V reference - not a veryuseful setting.Right Right AVDD 2.5V
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5 EVM Operation
MIDDLE
RIGHTLEFT
S1
S2
S3
S4
S5
S6
S7
LEFT
(External)
RIGHT
(Onboard)
5.1 Analog Input
EVM Operation
The following section provides information on the analog input, digital control, and generaloperating conditions of the ADS1241MEVM. Refer to Figure 1 for switch and jumper locations,and the meanings of left,middle, and right for switch settings in the following discussion.
Figure 1. ADS1241MEVM Switch and Jumper Locations
The analog input sources can be applied directly to J1 (top or bottom side) or through optionalamplifier and signal-conditioning modules. Consult the ADS1241 data sheet to determine themaximum analog input range. Switches S1-S5 can be used to select the source for inputsAIN0-3, as shown in Table 5 . AINCOM is selected by S5, as shown in Table 6 .
Table 5. Input Selection Options - S1 through S4
Switch Position Input Selected
J1.2 for AIN0J1.1 for AIN1Left
J1.4 for AIN2J1.3 for AIN3Middle Ground for AIN0-3Right 2.5V for AIN0-3
Table 6. AINCOM Selection Options - S5
Switch Position Input Selected
Left J1.10Middle GroundRight 2.5V
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5.2 Digital Control
5.3 Clock Source
EVM Operation
The digital control signals can be applied directly to J2 (top or bottom side). The modular
ADS1241MEVM can also be connected directly to a DSP or microcontroller interface board,
such as the HPA449. For a current list of compatible interface and/or accessory boards for the
EVM or the ADS1241, see the relevant product folder on the TI web site.
5.3.1 Onboard Oscillator
The ADS1241 requires a clock. A 4.9152MHz crystal is provided on the EVM, and may be
selected as the clock source for the device when switch S8 is in the right-hand position.
5.3.1.1 Oscillator Kickstart (Experimental)
Because the ADS1241 is a low power device, its clock oscillator circuit does not have extremely
strong drive capabilities. Using the crystal and load capacitor values provided on the EVM, the
clock oscillator starts up and works reliably. However, some users may wish to try a different
crystal or load capacitor values, and in some cases the ADS1241 clock oscillator will take a long
time to start up.
To help decrease startup time, the circuit built around U5 is provided on the EVM. This is only
for experimental purposes and has not been proven nor is it recommended; it is provided only as
a possibility for decreasing oscillator startup times. This kickstart circuit is designed to provide a
pulse of energy to the crystal to help get it started oscillating.
In use, the enable for the kickstart circuit (GPIO2) would be pulled high to activate the circuit. A
rising edge would then be applied to GPIO1, which should result in a pulse appearing at the
output of C19. Once the crystal has begun oscillating, GPIO2 should be brought low to remove
the kickstart circuit from the oscillator.
5.3.2 External Oscillator
When S8 is switched to the left, the clock source for the ADS1241 is provided from J2.13.
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6 EVM Bill of Materials and Schematic
6.1 ADS1241MEVM Schematic
EVM Bill of Materials and Schematic
The following table contains a complete bill of materials for the modular ADS1241MEVM.
Table 7. ADS1241MEVM Bill of Materials
Reference Designator Description Manufacturer Mfg. Part Number
R3, R4, R5, R6, R7, R8, R9, 0 Ω1/8W 5% Chip Resistor Panasonic ERJ-6GEY0R00VR10
R2, R11 10K Ω1/10W 5% Chip Resistor Panasonic ERJ-3GEYJ103VR1 24.9K Ω1/16W 1% Chip Panasonic ERJ-3EKF2492VResistorRA1, RA2, RA3 100 Ω1/8W 5% 4 Resistor, CTS Corporation 744C083101JTR8 Terminal NetworkC21 12pF 50V Ceramic TDK C1608C0G1H120JChip Capacitor, ±5%, C0GC19, C20 18pF 50V Ceramic TDK C1608C0G1H180JChip Capacitor, ±5%, C0GC2, C5 0.01µF 50V Ceramic TDK C2012X7R1H103KChip Capacitor, ±10%, X7RC13 1µF 16V Ceramic TDK C1608X5R1C105KChip Capacitor, ±10%, X5RC14, C16 1µF 16V Ceramic TDK C2012X7R1C105KChip Capacitor, ±10%, X7RC15, C18 4.7µF 6.3V Ceramic TDK C1608X5R0J475MChip Capacitor, ±20%, X5RC17 22µF 16V Ceramic TDK C3225X5R1C226MChip Capacitor, ±20%, X5RC1, C3, C4, C6, C7, C8, C9, Ceramic Chip Capacitor - NotC10, C11, C12 InstalledX1 4.9152MHz Crystal, Thru-hole CTS ATS042U1 Analog to Digital Converter Texas Instruments ADS1241EU2 Op Amp Texas Instruments OPA350UAU3 2.5V Reference Texas Instruments REF1004I-2.5U4 256K I
2
C EEPROM MicroChip 24LC256-I/SNU5 Tri-State Buffer, Single Gate Texas Instruments SN74LVC1G126DBVADS1241MEVM PCB Texas Instruments 6462006J1A, J2A 20-pin SMT Plug Samtec TSM-110-01-L-DV-PJ1B, J2B 20-pin SMT Socket Samtec SSW-110-22-F-D-VS-KJ3A 10-pin SMT Plug Samtec TSM-105-01-L-DV-PJ3B 10-pin SMT Socket Samtec SSW-105-22-F-D-VS-KJ4 5 X 2 Position Header Samtec TSW-105-07-L-D0.1" spacingJ5 1 X 2 Position Header Samtec TSW-102-07-L-S0.1" spacingS1, S2, S3, S4, S5, S6, S7 SP3T Ultra-miniature switch NKK Switches SS14MDP2S8 DPDT Ultra-miniature switch NKK Switches SS22SDP2TP1 Miniature Test Point Terminal Keystone Electronics 5000Header Shorting Block Samtec SNT-100-BK-T
The schematic diagram is provided as a reference.
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D:\ads1241mevm\ads1241mpm.ddb - ads1241mevm.sch
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ADS1241MEVM
DOCUMENT CONTROL NO. 6462007
+VA
1-VA 2
+5VA
3-5VA 4
AGND
5DGND 6
+1.8VD
7VD1 8
+3.3VD
9+5VD 10
J3
POWERHDR
2
3
6
74
U2
OPA350
4
8 6
U3
REF1004I-2.5
R2
10K
R1
24.9K 1%
AVDD
C16
1U 16V X7R
AVDD
C17
22U
AN0+ 2
AN1+ 4
AN2+ 6
AN3+ 8
AN4+ 10
AN5+ 12
AN6+ 14
AN7+ 16
REF- 18
REF+ 20
AGND
17
AGND
19
AN0-
1
AN1-
3
AN2-
5
AN3-
7
AGND
9
AGND
11
AGND
13
VCOM
15
J1
ANALOGHDR
CS
SCLK
DIN
DOUT
DRDY
PDWN
RESET
CLKX
FSX
DX
DR
INT
ADCDVDD
A0
1
A1
2
GND 4
SDA 5
SCL 6
WP
7
VCC 8
A2
3
U4
MCP_24LC256-I/SN
X1
4.9152MHz
C20
18P
C21
12P
DVDD
SDA SCL
RA1
100
RA2
100
DVDD 1
DGND 2
XIN 3
XOUT 4
RESET 5
DSYNC 6
PDWN 7
DGND 8
VREF+
9
VREF-
10
AIN0/D0
11
AIN1/D1
12
AIN4/D4
13
AIN5/D5
14
AIN6/D6
15
AIN7/D7
16
AIN2/D2
17
AIN3/D3
18
AINCOM
19
AGND
20
AVDD
21
POL 22
CS 23
DIN 24
DOUT 25
SCLK 26
DRDY 27
BUFEN 28
U1
ADS1241E
CNTLDSYNC
RA3
100
C19
18P
GPIO1
GPIO0
GPIO5
C11
DNP
C12
DNP
C10
DNP
C8
DNP
C9
DNP
C7
DNP
C5
10N
C6
DNP
C4
DNP
C2
10N
C3
DNP
C1
DNP
AIN0
AIN1
AIN2
AIN3
AINCOM
AN0- AN1- AN2- AN3-
BUFEN
POL
XIN XOUT
DVDD
TP1
XOUT
GPIO3
GPIO4
TOUT
GPIO2
24
1
53
U5
SN74LVC1G126DBV
S1
S2
S3
S4
S6
S7
R3 0
R4 0
R5 0
R6 0
R7 0
R8 0
R9 0
R10 0
AIN4
AIN5
AIN6
AIN7
C13
1U
S5
NKK_SS14MDP2
AVDD
C14
1U
1 2
3 4
5 6
7 8
9 10
J4
JPR-2X5
DVDD
AVDD
OBREF
AN0+ AN1+ AN2+ AN3+
C15
4.7U
C18
4.7U
REF-
REF+
AN4+
ADCAVDD
S8
NKK_SS22SDP2
AVDD
GPIO0 2
DGND 4
GPIO1 6
GPIO2 8
DGND 10
GPIO3 12
GPIO4 14
SCL 16
DGND 18
SDA 20
CNTL
1
CLKX
3
CLKR
5
FSX
7
FSR
9
DX
11
DR
13
INT
15
TOUT
17
GPIO5
19
J2 SERIALHDR
1 2
J5
R11
10K
DVDD

FCC Warnings
This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequencyenergy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules,which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in otherenvironments may cause interference with radio communications, in which case the user at his own expense will be required totake whatever measures may be required to correct this interference.
EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLYand is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms ofrequired design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typicallyfound in the end product incorporating the goods. As a prototype, this product does not fall within the scope of the European Uniondirective on electromagnetic compatibility and therefore may not meet the technical requirements of the directive.Should this evaluation kit not meet the specifications indicated in the EVM User's Guide, the kit may be returned within 30 daysfrom the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLERTO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANYWARRANTY 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 allclaims arising from the handling or use of the goods. Please be aware that the products received may not be regulatory compliantor agency certified (FCC, UL, CE, etc.). Due to the open construction of the product, it is the user's responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE Liable to the other FORANY 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 ofpatents or services described herein.
Please read the EVM User's Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM User's Guide prior tohandling the product. This notice contains important safety information about temperatures and voltages. For further safetyconcerns, please contact the TI application engineer.Persons handling the product must have electronics training and observe good laboratory practice standards.No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, orcombination in which such TI products or services might be or are used.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 2.7 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 arequestions 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 theEVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the loadspecification, please contact a TI field representative.During normal operation, some circuit components may have case temperatures greater than 30 °C. The EVM is designed tooperate properly with certain components above 85 °C as long as the input and output ranges are maintained. These componentsinclude but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types ofdevices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes nearthese devices during operation, please be aware that these devices may be very warm to the touch.
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