Texas Instruments ADS125H02 User manual

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ADS125H02 Evaluation Module
User's Guide
SBAU318A–October 2018–Revised April 2019
ADS125H02 Evaluation Module
ADS125H02 Evaluation Module
The ADS125H02 is a 2-channel, 24-bit, 40-kSPS, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with
an integrated ±18-V programmable gain amplifier (PGA) with a 1-GΩinput impedance. The device also
includes a voltage reference and features to enhance data reliability such as cyclic redundancy check
(CRC) and signal monitors.
The ADS125H02EVM is an evaluation module kit providing hardware and software support for evaluation
of the ADS125H0x, delta-sigma analog-to-digital converter (ADC). The kit uses the Texas Instruments
TM4C1294NCPDT processor to communicate with the ADC via SPI and provide communication with a PC
over the USB interface. The software application is downloaded from the Texas Instruments website and
runs on the Windows operating system allowing for register manipulation and data collection from the
ADC. The ADS125H02EVM kit includes the ADS125H02 device along with a USB micro cable.
This document includes a detailed description of the hardware (HW), software, bill of materials, and
schematic for the EVM.
Throughout this document, the term EVM is synonymous with the ADS125H02EVM, demonstration kit,
and evaluation module. The term GUI is synonymous with Delta-Sigma ADC EvaluaTIon Software, core
application, and EVM software. The use of Tiva™ is synonymous with the TM4C1294NCPDT
microcontroller.
Table 1. Related Documentation
Device Literature Number
ADS125H02 SBAS790
Delta-Sigma ADC EvaluatTIon
Software User Manual SBAU260

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Contents
1 EVM Overview ............................................................................................................... 3
2 Quick Start.................................................................................................................... 4
3 Hardware Reference ........................................................................................................ 6
4 Software Details............................................................................................................ 12
5 EVM Bill of Materials, PCB Layouts, and Schematics................................................................. 18
List of Figures
1 Default Configurations for ADS125H02 EVM............................................................................ 4
2 Input Terminal Blocks ....................................................................................................... 7
3 High-Voltage Supply Terminal Block...................................................................................... 9
4 Delta-Sigma Evaluation Engine Installation Instructions.............................................................. 12
5 Device Package Installation Instructions................................................................................ 13
6 GUI View Before Connecting............................................................................................. 14
7 GUI View After Connecting EVM......................................................................................... 14
8 Empty Register Map for an Unrecognized Device..................................................................... 15
9 Console Tab View of an Unrecognized Device ........................................................................ 15
10 Register Map for the ADS125H02 ....................................................................................... 15
11 Data Analysis Window..................................................................................................... 16
12 Top Silkscreen.............................................................................................................. 23
13 Top Layer (Positive) ....................................................................................................... 23
14 Ground Layer (Negative).................................................................................................. 24
15 Power Layer (Negative) ................................................................................................... 24
16 Bottom Layer (Positive).................................................................................................... 25
17 Bottom Silkscreen.......................................................................................................... 25
18 ADS125H02EVM Block Diagram Schematic........................................................................... 26
19 ADS125H02EVM Analog Inputs Header Schematic .................................................................. 27
20 ADS125H02EVM ADC Main Schematic ................................................................................ 28
21 ADS125H02EVM Digital Header Schematic ........................................................................... 29
22 ADS125H02EVM USB and Peripherals Schematic ................................................................... 30
23 ADS125H02EVM Processor Main Schematic.......................................................................... 31
24 ADS125H02EVM USB Power Schematic............................................................................... 32
25 ADS125H02EVM External Power Schematic .......................................................................... 33
List of Tables
1 Related Documentation..................................................................................................... 1
2 Default Settings.............................................................................................................. 4
3 Jumper and Switch Options................................................................................................ 6
4 Analog Input Terminal Blocks, J1–J3 ..................................................................................... 8
5 High-Voltage Supply Terminal Block, J4 ................................................................................. 9
6 Digital Interface, J5 ........................................................................................................ 10
7 Test Points .................................................................................................................. 10
8 ADS125H02 EVM Software Commands................................................................................ 17
9 EVM Bill of Materials....................................................................................................... 18
Trademarks
Tiva is a trademark of Texas Instruments, Incorporated.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
All other trademarks are the property of their respective owners.

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1 EVM Overview
1.1 Description
This user's guide describes the operation and use of the ADS125H02 evaluation module. The EVM
platform is intended for evaluating the ADS125H02 performance and functionality.
1.2 Requirements
1.2.1 Software Requirements
PC with Microsoft®Windows®7 or higher operating system.
1.2.2 Hardware Requirements
PC with available USB 2.0 or greater connection.
1.2.2.1 Power Supply
The ADS125H02EVM is USB powered and has an onboard ±15-V supply that is boosted from the USB
power. An external ±15-V supply may also be used for operation of the EVM. A header for an external
±15-V supply is provided at J4 through the left position of switch S1.
1.3 Software Reference
For the core software documentation, see the Delta-Sigma ADC EvaluaTIon Software User Manual or
navigate to the File -> About option from within the GUI, then click on the Software user guide icon.
1.4 Supported Functionality
1.4.1 Hardware Functionality
The EVM features the following hardware capabilities:
• Onboard 5-V AVDD supply operation
• Onboard 3.3-V DVDD supply
• Onboard or external high voltage power supply, either bipolar supplies or unipolar supply
• Digital header for external processor or controller configuration
• Analog header and configurable input circuitry for direct sensor connections
• Place holder for optional REF62xx external reference source
• Onboard (not installed) high-voltage multiplexer for analog inputs
• Fault LED for STATUS or CRC error notification
1.4.2 Software Functionality
The EVM features the following software functions:
• Device conversion control
• Device software reset
• Device power down
• Register read and write
• Conversion result readback
• Offset and system input calibration
• Readback of STATUS and CRC data bytes (for error detection)
• CRC of SPI communication between the ADC and the host (for error prevention or detection of data
transmission)

RIGHT OPEN
OPEN OPEN
JUMPER
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2 Quick Start
This section provides a guide to quickly begin using the EVM.
2.1 Default Jumper and Switch Configuration
The EVM is configured with the settings listed in Table 2 and shown in Figure 1.
Table 2. Default Settings
Jumper Position Function
JP1 (Not Installed) Use onboard processor
JP2 (Not Installed) USB-derived supplies ON
JP3 (Not Installed) DVDD from USB power (1-2 connection via R84)
JP4 (Not Installed) AVDD from USB power (1-2 connection via R85)
JP5 (Not Installed) External +5-V power down
JP6 Installed +5-V supply selection, jumper installed left
JP7 (Not Installed) Onboard HV supply disable, jumper not installed
JP8 Installed HV transformer driver clock input, jumper installed to select internal clock
Switch Position Function
S1 Left Bipolar high-voltage analog supply selection (±15 V)
Figure 1. Default Configurations for ADS125H02 EVM
2.2 Powering the EVM
The EVM is powered through the USB interface with the PC. This power includes a +5-V and an HV
supply generated onboard the EVM from the USB. Additionally, the HV supplies the ADS125H02 (±18 V
to ±5 V), which can be powered from an external source from header connections on J4 through switch
S1. Follow the installation and connection procedure in Section 2.3 before connecting the EVM to the PC.
Section 2.2.1 and Section 2.2.2 provide additional details about the analog and digital power supply
configurations of the ADC. Section 2.2.3 provides additional details about the high voltage supply.

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2.2.1 Analog Supply Configuration of the ADC
The ADS125H02 low-voltage analog supply requires a 5-V source for the AVDD. The EVM provides
onboard 5-V supply for the AVDD low-voltage analog supply.
Use R30 to measure the AVDD supply current, either by measuring the voltage drop across this resistor or
by removing the resistor and connecting a dc current meter between the A+ and A– test points.
2.2.2 Digital Supply Configuration of the ADC
The ADS125H02 digital supply requires a 2.7-V to 5.25-V source connected between DVDD and DGND.
The EVM provides a 3.3-V onboard digital supply for the digital supply of the ADC.
R31 can be use to measure the DVDD supply current, either by measuring the voltage drop across this
resistor or by removing the resistor and connecting a dc current meter between the D+ and D– test points.
2.2.3 High-Voltage Analog Supply Configuration of the ADC
The ADS125H02 high-voltage supply requires a high-voltage power supply ranging from ±18 V to ±5 V for
bipolar operation, or ranging from +36 V to +10 V for unipolar operation (when HV_AVSS = GND). An
onboard HV supply generator supplies ±15 V from the USB connection.
The EVM also provides terminal block J4 to connect an external ±15 V for the high-voltage analog supply
of the ADC when setting S1 to the left position. When switching S1, TI recommends disconnecting the
USB cable from the EVM, toggling the switch, and then reconnecting the USB cable.
R32 can be use to measure the high-voltage supply current, either by measuring the voltage drop across
this resistor or by removing the resistor and connecting a dc current meter between the HV_A+ and
HV_A– test points.
2.3 Software Installation and Hardware Connection Procedure
Use the following steps at startup:
1. Download all required software from www.ti.com/tool/ads125H02evm.
2. Install the GUI software on the PC.
3. Install the ADS125H02 device package software on the PC.
4. Ensure all jumpers and switches are configured in the default configuration per Table 2 and Figure 1.
5. Connect the EVM to the PC using a USB cable to power the board.
6. Attach the high-voltage supply to J4 and ensure that S1 is set to the left. Alternately, use the onboard
high-voltage supply (not installed) and set S1 to the right.
7. If prompted, install any required drivers.
8. Start the GUI application on your PC. The GUI automatically detects the connected EVM.
NOTE: After powering the EVM, the green D2 and +5V LEDs light up.

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3 Hardware Reference
3.1 Jumper and Switch Configuration Reference
Table 3 provides all jumper and switch configuration settings for the EVM.
(1) Switch is DPDT. Pin 1 is identified with a dot on the PCB silkscreen.
Table 3. Jumper and Switch Options
Jumper Position Description
JP1 Operation of EVM with external digital signals
Installed (ON) Hold the Tiva processor (U13) in reset and disable level shifters to allow external digital
signals
Uninstalled (OFF) Normal operation with onboard Tiva processor (default)
JP2 Power down USB power supplies
Installed (ON) USB-derived power supplies disabled and powered down
Uninstalled (OFF) USB-derived power supplies enabled and ON (default)
JP3 Digital supply source
1–2 shorted Digital supply (U18) powered from USB power (default using R94 as the short)
2–3 shorted Digital supply (U18) powered from external supply source
Open No digital system power provided
JP4 5-V supply source
Installed (ON) 5-V supply powered from USB (default using R85 as the short)
Uninstalled (OFF) No analog supply powering AVDD
JP5 EXT_5V supply power down
Installed (ON) External supply regulator (U18-not installed) disabled
Uninstalled (OFF) External supply regulator (U18-not installed) enabled (default)
JP6 Onboard 5-V source for the HV analog supply source
Right 5-V supply sourced from EXT_5V
Left 5-V supply sourced from USB power (default)
JP7 Disable for the onboard HV analog supply
Installed (ON) Holds enable low to disable onboard HV analog supply
Uninstalled (OFF) Onboard HV analog supply enabled (default)
JP8 External clock for transformer driver for the onboard HV analog supply
Installed (ON) Transformer driver (U22) uses onboard oscillator for onboard HV analog supply
(default)
Uninstalled (OFF) Connection to transformer driver (U22) external clock
Switch Position Description
S1(1) High-voltage analog supply selection switch
Right (pin connections:
5–6, 2–3) High-voltage supply sourced from onboard ±15-V supply (not installed)
Left (pin connections: 5–4,
2–1) High-voltage supply sourced from external supplies through J4 (default)
S2 Reset FAULT button
Closed (depressed) Clears FAULT indicator and writes 0x00 to the STATUS register of the ADC
Open (normally) Normal operation
S3 BSL button for Device Firmware Update (DFU) mode
Closed (depressed) Total Tiva FLASH erasure (on reset Tiva enumerates as a DFU device)
Open (normally) Normal operation
S4 Spare button (not installed)
Closed (depressed)
Open (normally)

IDAC2
IDAC1
AIN0
AIN1
REFN1
REFP1
REFN0
REFP0
GND
AINCOM
REFOUT
GND
J1
J2
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Table 3. Jumper and Switch Options (continued)
Jumper Position Description
S5 Tiva reset (U13 RST) button
Closed (depressed on
RESET) Tiva held in RESET, level shifters (U5, U6, and U7) tri-stated
Open (normally) Normal operation
3.2 Header, Connector, and Test Point Reference
This section provides the connection information and details for the connectors and test points utilized on
the EVM.
3.2.1 Analog Input Terminal Blocks
Connect the analog input to the EVM at the terminal blocks located on the left side of the board (as shown
in Figure 2) to evaluate the performance of the ADS125H02. The functions for these terminal blocks are
listed in Table 4. At no time apply a voltage to the inputs of the ADS125H02 that exceeds the absolute
maximum ratings for the device.
Figure 2. Input Terminal Blocks

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(1) Analog inputs are pinned out to terminal blocks through RC filters. See Figure 19 for additional connection details.
Table 4. Analog Input Terminal Blocks, J1–J3
Pin Function Test Point ADS125H02 Input
Pin
J1
1 IDAC current output IDAC2 IDAC2
2 IDAC current output IDAC1 IDAC1
3 Analog input(1) A0 AIN0
4 Analog input(1) A1 AIN1
5 External reference input 1 / GPIO 1 RP1 REFP1/GPIO0
6 External reference input 1 / GPIO 0 RN1 REFN1/GPIO1
7 External reference input 0 RP0 REFP0
8 External reference input 0 RN0 REFN0
9 GND – GND
J2
1 Analog input(1) ACOM AINCOM
2 Reference output – REFOUT
3 GND – GND
J3 (not installed)
1 Multiplexer analog input S1A –
2 Multiplexer analog input S2A –
3 Multiplexer analog input S3A –
4 Multiplexer analog input S4A –
5 Multiplexer analog input S1B –
6 Multiplexer analog input S2B –
7 Multiplexer analog input S3B –
8 Multiplexer analog input S4B –
9 GND – GND

+15V_EXT
J4
í15V_EXT GND
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3.2.2 High-Voltage Supply Terminal
The EVM has an optional external high-voltage supply connection (nominally ±15 V) that is connected to
the J4 terminal block located on the top center side of the board, as shown in Figure 3. This connection
provides a high voltage bipolar supply to the EVM for evaluation purposes. The functions for these
terminal blocks are listed in Table 5. Never apply a supply voltage that exceeds the absolute maximum
ratings for the power supply of the ADS125H02.
Figure 3. High-Voltage Supply Terminal Block
Table 5. High-Voltage Supply Terminal Block, J4
Pin Function Test Point ADS125H02 Input Pin
J4
1 –15-V supply input -15V_EXT HV_AVSS
2 GND GND GND
3 +15-V supply input +15V_EXT HV_AVDD
3.2.3 External Clock
By default, a clock is supplied by the internal oscillator of the ADC when the CLKIN pin is low. However,
the EVM also provides the capability to connect an external clock directly to the ADC using the J5
connector; see Figure 21. When connecting to J5, a direct connection can be made between pins 42
(CLKIN) and 40 (GND). A typical clock source of 7.3728 MHz (10.24 MHz only for 40000 SPS operation)
tracks with all timing described in the ADS125H02 data sheet.
NOTE: The CLKIN pin connects to the Tiva microcontroller. The microcontroller holds the CLKIN pin
low in order to enable the internal oscillator of the ADC. Before applying an external clock,
be sure to disable the GPIO output on this pin by sending the HOLDCLOCK 0 command, as
described in Table 8.

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3.2.4 Digital Interface Header
Table 6 lists the functions and pin numbers for all signals used on the digital interface.
(1) Even-numbered pins not included in this list are connected to GND.
(2) Odd-numbered pins not included are connected to the Tiva microcontroller (via level shifters) but the functionality is not used for
this EVM. For connection details, see Figure 21.
(3) Signals connected to the Tiva microcontroller are named according to their respective processor pin connections. For connection
details, see Figure 21.
Table 6. Digital Interface, J5
Function ADC Side Processor Side
Signal Name Pin Number(1) Pin Number(2) Signal Name , Tiva
Connection(3)
External voltage input GND 56 55 EXT_5V
Bank3 level-shifter voltage DVDD 54 53 LVDD1
GPIO for the ADC FAULT_LED 52 51 PD7
EXT_CLK 42 41 PD3 (Unused)
Bank2 level-shifter voltage DVDD 36 35 LVDD2
SPI0 ADC_nCS2 34 33 PA0
ADC_nDRDY 32 31 PA1
ADC_SCLK 30 29 PA2 (SSI0CLK)
ADC_nCS1 28 27 PA3
ADC_MOSI (DIN) 26 25 PA4 (SSI0XDAT0)
ADC_MISO (DOUT) 24 23 PA5 (SSI0XDAT1)
ADC GPIOs ADC_START 22 21 PA6
ADC_nRESET 20 19 PA7
Bank1 level-shifter voltage DVDD 18 17 LVDD3 (Unused)
3.2.5 Test Points
The test points listed in Table 7 may be used to probe onboard voltage supplies and signals.
Table 7. Test Points
Function Signal Name Restrictions
ADC side
Excitation current source (IDAC2) IDAC2 Probe only
Excitation current source (IDAC1) IDAC1 Probe only
Analog input (AIN0) A0 Probe only
Analog input (AIN1) A1 Probe only
Reference input (REFN1 / GPIO1) RN1 Probe only
Reference input (REFP1 / GPIO0) RP1 Probe only
Reference input (REFN0) RN0 Probe only
Reference input (REFP0) RP0 Probe only
Analog input (AINCOM) ACOM Probe only
Internal reference (REFOUT) REFOUT Probe only
External Reference Supply Source REF SUPPLY Probe only
Analog supply (AVDD supply side of sense resistor) A+ Probe only
Analog supply (AVDD device side of sense resistor) A– Probe only
Digital supply (DVDD supply side of sense resistor) D+ Probe only
Digital supply (DVDD device side of sense resistor) D– Probe only
HV analog supply (HV_AVDD supply side of sense resistor) HV_A+ Probe only
HV analog supply (HV_AVDD device side of sense resistor) HV_A– Probe only

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Table 7. Test Points (continued)
Function Signal Name Restrictions
2-V subregulator output (BYPASS) BYPASS Probe only
Internal reference (REFOUT) REFOUT Probe only
5-V supply +5V Probe only
3.3-V supply +3.3V Probe only
Ground GND Probe only
Processor Side
USB-sourced supply USB_VBUS
(VBUS+) Probe only
USB-sourced supply USB_VBUSP
(VBUS–) Probe only
5.5-V output (U14) USB_BOOST
(+5.5V) Probe only
1.8-V output (U16) +1.8V Probe only
5.0-V output (U15) +5V Probe only
Ground GND Probe only
3.3-V output (U18) +3.3V Probe only
Step-up transformer output (not populated) HVBoost Probe only
Inverting transformer output (not populated) HVInvert Probe only

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4 Software Details
4.1 Installing the Software
4.1.1 Delta-Sigma ADC EvaluaTIon Software
Download the Delta-Sigma ADC EvaluaTIon Software installer, as shown in Figure 4, from the
DELTASIGMAEVAL-GUI page and save to a local folder. Run the installer and follow the on-screen
prompts. Future software versions may show slightly different screens.
Figure 4. Delta-Sigma Evaluation Engine Installation Instructions

STEP 1 STEP 2
STEP 3 STEP 4
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4.1.2 ADS125H02 EVM Device Package
Download the ADS125H02 Device Package installer, as shown in Figure 5, from the ADS125H02EVM tool
page for the ADS125H02EVM and save the file to a local folder. Run the appropriate device package
installer and follow the on-screen prompts. Future software versions may show slightly different screens.
Figure 5. Device Package Installation Instructions

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4.2 Connecting to the EVM Hardware
After the Delta-Sigma ADC EvaluaTIon Software and the ADS125H02 Device Package is installed,
connect the hardware with the provided USB micro cable and connect the high-voltage supplies to J4 (if
the onboard high-voltage supply is not installed). Start the Delta-Sigma ADC EvaluaTIon Software. The
GUI automatically detects the connected hardware and displays the device register map under the Device
tab as Figure 6 and Figure 7 show.
Figure 6. GUI View Before Connecting Figure 7. GUI View After Connecting EVM
4.3 Using the Software With the EVM
The Delta-Sigma ADC EvaluaTIon Software User Manual provides an overview of the GUI, an explanation
of how to modify device register settings, how to collect and analyze data, and control device operations
with scripts. For a list of commands that are supported on the ADS125H02 EVM, see Section 4.3.4.

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4.3.1 Powering Up the EVM
When the EVM is powered up, the software start up must allow the GUI to identify the device and post the
register map. However, if the EVM fails to recognize the device, the register map is not read out by the
device. The device table appears as an empty register map, as shown in Figure 8. Verify that the device is
unrecognized by checking the Console tab to see that the USB is connected to an unrecognized device,
as shown in Figure 9 and Figure 9.
Figure 8. Empty Register Map for an Unrecognized
Device Figure 9. Console Tab View of an Unrecognized Device
Verify that the ADS125H02EVM is properly connected to the USB port. Then check the connection to the
high-voltage supplies at J4, and the position of switch S2. If the EVM is fully powered up, press the
RESET button at the lower left corner of the EVM, next to the USB cable connection.
4.3.2 ADS125H02EVM Configuration
When the ADS125H02EVM is correctly powered up, the software recognizes the device. The register map
must be configurable in the GUI as shown in Figure 10.
Figure 10. Register Map for the ADS125H02
The ADS125H02 can be configured through the register map as well as through commands through the
Console tab as described in Section 4.3.4.

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4.3.3 ADS125H02 Data Analysis Window
The Delta-Sigma ADC EvaluaTIon Software collects data from the EVM with the Data Analysis window.
Clicking on the Data Analysis icon opens up the analysis engine of for the software. This window is shown
in Figure 11.
Figure 11. Data Analysis Window
Here are several helpful hints to collecting data with the Data Analysis window:
• It is convenient to set the points/sample size in the lower left corner of the Data Analysis window to a
lower value. The default sample size is 2048, while the default data rate for the ADS125H02 is 20
SPS. Collecting that amount of data takes over 100 seconds.
• When the Data Analysis window plots voltage, ensure that the reference voltage is set to the correct
value. The default setting for the reference is set to AVDD to AVSS and the reference is set to 5 V,
instead of the 2.5-V reference default setting in the window.
• The voltage values for PGA gains below 1 V/V (0.125, 0.1875, 0.25, and 0.5) cannot be processed in
the Data Analysis window. The actual output voltage shown in the plot is smaller by a factor of the
gain. If the display plots the output ADC code, the code is correct.
The Data Analysis window collects and plots the ADC data. To start, click on the Collect Data button at
the lower right. For more information about the Data Analysis window or the EVM software, consult the
Delta-Sigma ADC EvaluaTIon Software User Manual.
4.3.4 ADS125H02 EVM Commands
The EVM commands are given in Table 8. These commands are available for use within the Scripts and
Console tabs of the Delta-Sigma ADC EvaluaTIon software. Many of these commands are SPI commands
that are defined in the device data sheet. All other command functions are provided by the EVM firmware.
In general, most device commands that communicate with the ADC via SPI require the PWDN pin to be
set high, prior to issuing the command. When the PWDN pin is low, the device is in hardware power-down
mode and all device functions are disabled (only the internal LDO remains powered). Returning the
PWDN pin resumes normal ADC operations and preserves the registers settings.
The ADC may also be placed into a software power-down mode by setting the PWDN bit high, in the
MODE3 register. In this mode the internal LDO, internal reference, and serial interface remain enabled.
SPI commands can be sent while the device is in software power-down mode; however, these actions
may or may not take effect in this mode.
Some of the commands listed in Table 8 may wake the ADC prior to taking effect, particularly for EVM
commands that are used by the GUI. See the Wakes Device? column in Table 8 to determine the
intended behavior of the EVM firmware.

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(1) Returns device to previous state after completion.
(2) Resetting wakes the device from software-power down mode.
Table 8. ADS125H02 EVM Software Commands
Command Command
Arguments Description Wakes Device?
ID Returns EVM ID string: "<DEVICE> <DATE> <TIME>", where "<DEVICE>" is "ADS125H02", and
"<DATE> <TIME>" indicates when the EVM firmware was complied. N
COMMANDLIST Returns a list of all commands supported by the EVM firmware. N
COLLECT <# Samples> Collects a number of ADC samples equal to "<# Samples>", where "<# Samples>" is an unsigned integer. During this operation, all other commands are ignored and the BUSY LED blinks until all
samples have been collected. Y(1)
REGMAP This command is used by the GUI to read the values of all registers. Y(1)
NOP Issues the NOP device command to the ADC (via SPI). N
RESET Issues the RESET device command to the ADC (via SPI). N(2)
START Sets the START pin low and issues the START device command to the ADC (via SPI). N
STOP Sets the START pin low and issues the STOP device command to the ADC (via SPI). N
RDATA Starts a single conversion, waits for DRDY to go low, and prints the conversion result to the console. N
OFSCAL Issues the offset calibration device command to the ADC (via SPI). N
GANCAL Issues the gain calibration device command to the ADC (via SPI). N
RREG <ADDRESS> Issues a read register device command to the ADC (via SPI), where "<ADDRESS>" is the starting
register address in hexadecimal (without the "0x" prefix or "h" postfix). N
READSINGLE <ADDRESS> This command is used by the GUI. This command provides the same function as RREG, but wakes the
device from power down and returns to previous power-down mode after completion. Y(1)
HOLDCLOCK <"0" or "1"> This command disables the Tiva GPIO output connected to "EXT CLK" to allow for external clocks to be
applied to J5. Refer to Section 3.2.3.N
WREG <ADDRESS>
<DATA>
Issues a write register device command to the ADC (via SPI), where "<ADDRESS>" is the starting
register address in hex, and "<DATA>" is the value to write to the register in hex (without the "0x" prefix
or "h" postfix). N
WRITESINGLE <ADDRESS>
<DATA> This command is used by the GUI. This command provides the same function as WREG, but wakes the device from power down and returns to previous power-down mode after completion. Y(1)
LOCK Sends the lock register device command to the ADC (via SPI). While in this mode, all write register
commands are ignored until the device is unlocked. N
UNLOCK Sends the unlock register device command to the ADC (via SPI). This command unlocks the device
register to allow write commands to take effect. N
HOLDSTART <"0" or "1"> This command controls the state of the START GPIO pin. An argument of "1" sets the START pin high,
while a "0" argument sets the START pin low. N
HWRESET This command toggles the RESET GPIO pin. N(2)
CLEAR Clears the software fault flag, writes "0x00" to the STATS register (to clear the CRC_ERR and RESET bits), and turns off the FAULT LED. NOTE: Pressing S3 performs the same action as the CLEAR
command. N
STATUS Reads the STATUS register (to check for any new fault conditions) and prints (to the console) a description of each fault type that has occurred since last clearing the software fault flag (with S3 or the
CLEAR command). N
CRC
<LENGTH>
<DATA1>
<DATA2>
<DATA3>
<DATA4>
Computes the CRC-n of the data bytes given in "<DATA1>" through "<DATA4>", where "<LENGTH>" is
the number of bytes to be used in the CRC-n calculation. If the number of data bytes provided is greater
than "<LENGTH>", the extra data bytes are ignored. N
DONTCARE <VALUE> Sets the "Don't care" byte value that is used for all SPI commands that include a "Don't care" byte. Changing the value of this byte only has the effect of modifying the resulting CRC byte that is used with
CRC-mode. N
SPISEND <LENGTH> <BYTE1>
<BYTE2> ...
Sends a user-specified SPI command sequence to the ADC. CS remains low until all bytes have been
sent. After issuing this command the firmware reads the STATUS register to check for any CRC errors.
This command allows for testing of the CRC command validation of the ADC, for example, because this
command allows the user to provide invalid CRC bytes with the various SPI commands.
N

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ADS125H02 Evaluation Module
5 EVM Bill of Materials, PCB Layouts, and Schematics
The bill of materials and schematics are shown for the ADS125H02EVM.
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 www.ti.com.)
Table 9. EVM Bill of Materials
Designator Qty Value Description Package Reference Part Number Manufacturer
!PCB1 1 Printed Circuit Board DC045 Any
C1, C2, C4, C5, C7, C8 6 1000pF CAP, CERM, 1000 pF, 50 V, ±10%, C0G/NP0, 0603 0603 06035A102KAT2A AVX
C3, C6, C9, C10 4 0.01uF CAP, CERM, 0.01 uF, 50 V, +/- 5%, C0G/NP0, 0603 0603 GRM1885C1H103JA01D MuRata
C11, C12 2 0.1uF CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R, 0603 0603 C1608X7R1H104K080AA TDK
C16, C18, C21, C23, C51, C62,
C65, C67, C69, C71 10 1uF CAP, CERM, 1 uF, 50 V, +/- 10%, X7R, 0603 0603 UMK107AB7105KA-T Taiyo Yuden
C17, C19, C26, C27, C28, C29,
C30, C33, C34, C35, C36, C39,
C40, C45, C46, C47, C48, C49,
C52, C54, C55, C56, C57, C63,
C68
25 0.1uF CAP, CERM, 0.1 uF, 25 V, +/- 5%, X7R, 0603 0603 06033C104JAT2A AVX
C20, C25, C76 3 0.1uF CAP, CERM, 0.1 uF, 100 V,+/- 10%, X7R, AEC-Q200 Grade 1,
0603 0603 GCJ188R72A104KA01D MuRata
C22 1 4700pF CAP, CERM, 4700 pF, 100 V, +/- 5%, C0G/NP0, 0603 0603 C0603C472J1GAC7867 Kemet
C24 1 10uF CAP, CERM, 10 uF, 10 V, +/- 10%, X7R, 0805 0603 GRM21BR71A106KE51L MuRata
C41, C42 2 6.8pF CAP, CERM, 6.8 pF, 50 V, +/- 4%, C0G/NP0, 0603 0603 06035A6R8CAT2A AVX
C43, C44 2 12pF CAP, CERM, 12 pF, 50 V, +/- 5%, C0G/NP0, 0603 0603 C0603C120J5GACTU Kemet
C50, C53 2 2.2uF CAP, CERM, 2.2 uF, 35 V, +/- 10%, X5R, 0603 0603 GRM188R6YA225KA12D MuRata
C58 1 4.7uF CAP, CERM, 4.7 uF, 50 V, +/- 10%, X7R, 1206 1206 GRM31CR71H475KA12L MuRata
C59 1 100pF CAP, CERM, 100 pF, 50 V, +/- 5%, C0G/NP0, 0603 0603 C0603C101J5GACTU Kemet
C60 1 22uF CAP, CERM, 22 uF, 16 V, +/- 10%, X7R, 1210 1210 GRM32ER71C226KE18L Murata
C61 1 10uF CAP, CERM, 10 uF, 35 V, +/- 10%, X7R, 1206 1206 GMK316AB7106KL Taiyo Yuden
C64 1 47uF CAP, CERM, 47 uF, 10 V, +/- 20%, X5R, 1206 1206 C3216X5R1A476M160AB TDK
C66, C70 2 1000pF CAP, CERM, 1000 pF, 100 V, +/- 5%, X7R, 0603 0603 06031C102JAT2A AVX
C77, C78, C80, C81 4 10uF CAP, CERM, 10 uF, 50 V, +/- 10%, X5R, 1206 1206 GRM31CR61H106KA12L Murata
D1 1 Orange LED, Orange, SMD LED_0603 LTST-C191KFKT Lite-On
D2, D3, D5 3 Green LED, Green, SMD LED_0603 LTST-C191TGKT Lite-On
D4 1 Red LED, Red, SMD LED_0603 LTST-C191KRKT Lite-On

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19
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ADS125H02 Evaluation Module
Table 9. EVM Bill of Materials (continued)
Designator Qty Value Description Package Reference Part Number Manufacturer
D8, D9 2 Diode, Schottky, 80 V, 0.5 A, SOD-123 SOD-123 MBR0580-TP Micro Commercial
Components
H1, H2, H3, H4 4 Bumpon, Cylindrical, 0.312 X 0.200, Black Black Bumpon SJ61A1 3M
J1 1 Terminal Block, 3.5mm, 9x1, R/A, TH ED555/9DS On-Shore Technology
J2, J4 2 Terminal Block, 3.5mm Pitch, 3x1, TH ED555/3DS On-Shore Technology
J6 1 Connector, Receptacle, Micro-USB Type B, R/A, Bottom Mount
SMT 473460001 Molex
JP6 1 Header, 100mil, 3x1, Gold, TH PBC03SAAN Sullins Connector
Solutions
JP7, JP8 2 Header, 100mil, 2x1, Gold, TH TSW-102-07-G-S Samtec
L1 1 1uH Inductor, Wirewound, Ferrite, 1 uH, 2.05 A, 0.054 ohm, SMD 1210 LQH32PH1R0NN0L Murata
R1, R2, R5, R7, R10, R12, R28,
R29, R78, R81 11 0 RES, 0, 5%, 0.1 W, 0603 0603 RC0603JR-070RL Yageo America
R3, R4, R6, R8, R11, R13, R15,
R56, R58, R66 10 100 RES, 100, 1%, 0.1 W, 0603 0603 RC0603FR-07100RL Yageo America
R30, R31, R32, R73 4 0.1 RES, 0.1, 1%, 0.1 W, 0603 0603 ERJ-L03KF10CV Panasonic
R33, R39, R40, R41, R42, R43,
R44, R45, R46 9 47 RES, 47, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW060347R0JNEA Vishay-Dale
R34, R35, R36, R37, R38, R48,
R49, R74, R97 9 100k RES, 100 k, 1%, 0.1 W, 0603 0603 RC0603FR-07100KL Yageo America
R47 1 1.69k RES, 1.69 k, 1%, 0.1 W, 0603 0603 RC0603FR-071K69L Yageo America
R51, R54, R55, R57, R67 5 10k RES, 10.0 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW060310K0FKEA Vishay-Dale
R52, R86 2 1k RES, 1.00 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06031K00FKEA Vishay-Dale
R53 1 8.06k RES, 8.06 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06038K06FKEA Vishay-Dale
R61, R62, R63 3 2.94k RES, 2.94 k, 1%, 0.1 W, 0603 0603 RC0603FR-072K94L Yageo America
R68 1 1.0Meg RES, 1.0 M, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06031M00JNEA Vishay-Dale
R70 1 4.87k RES, 4.87 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06034K87FKEA Vishay-Dale
R71 1 2.00k RES, 2.00 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06032K00FKEA Vishay-Dale
R72 1 51 RES, 51, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW060351R0JNEA Vishay-Dale
R75 1 20.0k RES, 20.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0720KL Yageo America
R76 1 768k RES, 768 k, 1%, 0.1 W, 0603 0603 RC0603FR-07768KL Yageo America
R77 1 215k RES, 215 k, 1%, 0.1 W, 0603 0603 RC0603FR-07215KL Yageo America
R84, R85 2 0 RES, 0, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06030000Z0EA Vishay-Dale
R91 1 10k RES, 10 k, 5%, 0.1 W, 0603 0603 RC1608J103CS Samsung Electro-
Mechanics
R92 1 118k RES, 118 k, 1%, 0.1 W, 0603 0603 RC0603FR-07118KL Yageo America
R93 1 150k RES, 150 k, 1%, 0.1 W, 0603 0603 RC0603FR-07150KL Yageo America
R94, R95 2 10.0k RES, 10.0 k, 1%, 0.1 W, 0603 0603 ERJ-3EKF1002V Panasonic
R96 1 499k RES, 499 k, 1%, 0.1 W, 0603 0603 RC0603FR-07499KL Yageo America

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ADS125H02 Evaluation Module
Table 9. EVM Bill of Materials (continued)
Designator Qty Value Description Package Reference Part Number Manufacturer
S1 1 SLIDE SWITCH DPDT .1A, SMT SWITCH, 5.4x2.5x3.9mm CAS-220TA Copal Electronics
S2, S3, S5 3 Switch, Tactile, SPST-NO, 0.05A, 12V, SMT Switch, 4.4x2x2.9 mm TL1015AF160QG E-Switch
SH-1, SH-2 2 1x2 Shunt, 100mil, Flash Gold, Black Closed Top 100mil Shunt SPC02SYAN Sullins Connector
Solutions
T1 1 475 uH Transformer, 475 uH, SMT 760390015 Wurth Elektronik
U3 1 +/- 15.5 V-Input, 3-Channel, 19.2-kSPS, 24-Bit, Delta-Sigma
ADC With PGA and Voltage Reference, RHB0032E (VQFN-32) VQFN-32 ADS125H02IRHBR Texas Instruments
U4 1 Single Inverter Buffer/Driver With Open-Drain Output, DCK0005A DCK0005A SN74LVC1G06DCKT Texas Instruments
U5, U6 2 8-Bit Bidirectional Voltage-Level Shifter For Open-Drain And
Push-Pull Application, RGY0020A (VQFN-20) RGY0020A TXS0108ERGYR Texas Instruments
U8 1 USB ESD Solution with Power Clamp, 4 Channels, -40 to +85
degC, 6-pin SON (DRY), Green (RoHS & no Sb/Br) DRY0006A TPD4S012DRYR Texas Instruments
U9 1 High-Speed USB 2.0 (480 Mbps) 1:2 Multiplexer / Demultiplexer
Switch with Single Enable, 6 ohm RON, 2.5 to 3.3V, -40 to 85
degC, 10-Pin UQFN (RSE), Green (RoHS & no Sb/Br)
RSE0010A TS3USB221ERSER Texas Instruments
U10 1 Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI
Transceiver, QFN-32 5x5 QFN-32 USB3320C-EZK Microchip
U12 1 Triple Inverter Buffer/Driver with Open-Drain Output, DCU0008A,
SMALL T&R DCU0008A SN74LVC3G06DCUT Texas Instruments
U13 1 Tiva C Series Microcontroller, 1024 KB Flash, 256 KB SRAM, 12
Bit, 20 Channels, -40 to 85 degC, 128-Pin TQFP (PDT), Green
(RoHS & no Sb/Br), Tape and Reel
PDT0128A TM4C1294NCPDTI3R Texas Instruments
U14 1 3.5MHz, 1.5A, 92% Efficient Boost Converter with Adjustable
Input Current Limit, DSG0008A (WSON-8) DSG0008A TPS61252DSGR Texas Instruments
U15 1 36-V, 1-A, 4.17-uVRMS, RF LDO Voltage Regulator, RGW0020A
(VQFN-20) RGW0020A TPS7A4700RGWR Texas Instruments
U16 1 Single Output High PSRR LDO, 150 mA, Fixed 1.8 V Output, 2.5
to 6.5 V Input, with Low IQ, 5-pin SC70 (DCK), -40 to 85 degC,
Green (RoHS & no Sb/Br)
DCK0005A TPS71718DCKR Texas Instruments
U17 1 Voltage Supervisor with Active-Low, Open Drain Reset, 1 Supply
Monitored, -40 to 125 degC, 3-pin SOT-23 (DBZ), Green (RoHS
& no Sb/Br)
DBZ0003A TLV803MDBZR Texas Instruments
U18 1 Single Output LDO, 1A, Adj. (1.2 to 5.0V), Reverse Current
Protection, DRV0006A (WSON-6) DRV0006A TPS73733DRVR Texas Instruments
U22 1 Low-Noise 1 A, 420 kHz Transformer Driver, DBV0006A (SOT-
23-6) DBV0006A SN6505BDBVR Texas Instruments
U23 1 Wide-VIN (+/-33 V), 150-mA, Spilt-Rail Output, Positive and
Negative LDO Voltage Regulator with Startup Tracking,
DSC0010J (WSON-10)
DSC0010J TPS7A3901DSCR Texas Instruments
Y1 1 Crystal, 25 MHz, 18 pF, SMD ABM3 ABM3-25.000MHZ-D2Y-T Abracon Corporation
Y2 1 CRYSTAL, 32.768KHz, 7PF, SMD 1.5x1.4x6.7mm SSPT7F-7PF20-R Seiko Instruments
C11, C12, C76 0 0.1uF CAP, CERM, 0.1 uF, 100 V, +/- 10%, X7R, 0603 0603 GRM188R72A104KA35D MuRata
C13 0 2.2uF CAP, CERM, 2.2 uF, 10 V, +/- 10%, X7R, 0603 0603 GRM188R71A225KE15D MuRata