Texas Instruments ADS1259EVM User Manual

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This user's guide describes the characteristics, operation, and use of the ADS1259EVM, both by itself and

as part of the ADS1259EVM-PDK. This evaluation model (EVM) is an evaluation board for two different

devices. First, it can be used to evaluate the ADS1259, a low-noise, 24-bit, single-channel, delta-sigma

(ΔΣ) analog-to-digital converter (ADC). The ADS1259 can be used either in standalone applications or

with the PGA280. The PGA280 is a high-precision instrumentation amplifier with digitally-controllable gain

and signal integrity test capability. The combination of these two devices forms a high-resolution

measurement system able to digitize a wide range of signals.

This EVM allows performance evaluations of both the ADS1259 and the PGA280. The EVM also allows

for PGA280 control of the ADS1259 through the use of the external chip select modes. Complete circuit

descriptions, schematic diagrams, printed circuit board (PCB) layouts, and bill of material are included in

this document.

The following related documents are available through the Texas Instruments web site at

http://www.ti.com.

ADCPro is a trademark of Texas Instruments.

Microsoft, Windows are registered trademarks of Microsoft Corporation.

SPI is a trademark of Motorola Inc.

C is a trademark of NXP Semiconductors.

NI-VISA is a trademark of National Instruments.

All other trademarks are the property of their respective owners.

SBAU163A – March 2010 – Revised April 2010

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ADS1259EVM, ADS1259EVM-PDK

ADS1259EVM (Left) and ADS1259EVM-PDK (Right)

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Summary of Contents for Texas Instruments ADS1259EVM

Page 1 ADS1259EVM, ADS1259EVM-PDK ADS1259EVM (Left) and ADS1259EVM-PDK (Right) This user's guide describes the characteristics, operation, and use of the ADS1259EVM, both by itself and as part of the ADS1259EVM-PDK. This evaluation model (EVM) is an evaluation board for two different devices. First, it can be used to evaluate the ADS1259, a low-noise, 24-bit, single-channel, delta-sigma (ΔΣ) analog-to-digital converter (ADC).
Page 2: Table Of Contents
ADS1259EVM-PDK Setup Wizard: Screen 3 ................ADS1259EVM-PDK Setup Wizard: Screen 4 ....................MMB0 Initial Configuration ................Connecting the ADS1259EVM to the MMB0 ..................Using the +6V Wall Supply for +5V ................MMB0 Configured for Lab Power Supply ................NI-VISA Driver Installation Wizard, Screen 1 ................
Page 3 J8: Analog Interface Header Pinout ..................... J7: Serial Data Interface Pins .................. J11 Configuration: Power-Supply Input ..................ADS1259EVM Bill of Materials SBAU163A – March 2010 – Revised April 2010 ADS1259EVM, ADS1259EVM-PDK Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 4: Evm Overview
The input pins on the ADS1259EVM do not connect directly to the part, but connect to the inputs of the ADS1259 through switch S2 and modest filtering. Along with the analog header, these analog inputs can be easily accessed through test loops TP7 and TP8.
Page 5: Test Points Tp11 And Tp12
ADC input from the AINP or AINN inputs from the analog interface header, the VOP and VON outputs of the PGA280, or allows for the self calibration inputs in combination with jumper J15. SBAU163A – March 2010 – Revised April 2010 ADS1259EVM, ADS1259EVM-PDK Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 6: Digital Interface
Figure 3. Switch S3 Digital Interface The ADS1259EVM is designed to easily interface with multiple control platforms. Samtec part numbers 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 J7. This header/socket provides access to the digital control and serial data pins of the ADC.
Page 7: Power Supplies
J11.6 AGND Analog ground input J11.7 +1.8VD 1.8V digital supply J11.8 Not used J11.9 +3.3VD 3.3V digital supply Always J11.10 +5VD SBAU163A – March 2010 – Revised April 2010 ADS1259EVM, ADS1259EVM-PDK Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 8: Voltage Reference
J11. The supplies +VA and –VA can be set to +10V to +15V, and –10V to –15V, respectively. Voltage Reference The ADS1259EVM has three options for supplying a reference voltage to the ADS1259. There are two options for an external reference and one option with the internal ADS1259 reference.
Page 9: Ads1259 Control
ADS1259 though several of the PGA GPIOs. Note that this method of control is used in the ADS1259EVM-PDK, and that jumpers J2, J3, and J4 must be set to the left to enable control through ADCPro and the ADS1259EVM plug-in.
Page 10: Evm Operation
Usage in PDK If using the ADS1259EVM as part of the ADS1259EVM-PDK, switch S4 should be set to the left, using the multiplexer output. Using the onboard 7.3728MHz crystal oscillator allows the ADS1259EVM-PDK software to recognize the EVM using the software provided.
Page 11: Ads1259Evm Default Jumper Positions
Figure 7 shows the jumpers found on the EVM and the respective factory default conditions for each. Figure 7. ADS1259EVM Default Jumper Positions Four switches are used on the ADS1259/PGA280. Three-way switch S1 is set to the center position, setting the output common-mode of the PGA280 to AVDD/2. Switch S2 is set to the right, connecting the ADS1259 reference to the EVM onboard reference.
Page 12: Ads1259Evm-Pdk Operation
The latest software is available from the TI website at http://www.ti.com. The CD-ROM shipped with the ADS1259EVM may not contain the latest software, but the ADCPro installer will check for updates when executed (if connected to the Internet), and then give you the option of downloading and installing the latest version.
Page 13: Ads1259Evm-Pdk Setup Wizard: Screen 1
ADS1259EVM-PDK Operation www.ti.com Figure 9. ADS1259EVM-PDK Setup Wizard: Screen 1 Figure 10. ADS1259EVM-PDK Setup Wizard: Screen 2 SBAU163A – March 2010 – Revised April 2010 ADS1259EVM, ADS1259EVM-PDK Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 14: Ads1259Evm-Pdk Setup Wizard: Screen 3
ADS1259EVM-PDK Operation www.ti.com Figure 11. ADS1259EVM-PDK Setup Wizard: Screen 3 Figure 12. ADS1259EVM-PDK Setup Wizard: Screen 4 The software should now be installed, but the USB drivers may not yet have been loaded by the PC operating system. This step completes when the ADCPro software is executed; see Section 9.4, Running...
Page 15: Mmb0 Initial Configuration
ADS1259EVM-PDK Operation www.ti.com Setting Up the ADS1259EVM-PDK The ADS1259EVM-PDK contains both the ADS1259EVM and the MMB0 motherboard; however, the devices are shipped unconnected. Follow these steps to set up the ADS1259EVM-PDK: Step 1. Unpack the ADS1259EVM-PDK package. Step 2. Set the jumpers and switches on the MMB0 as shown in Figure •...
Page 16: Connecting The Ads1259Evm To The Mmb0
The MMB0 is a Modular EVM System motherboard. It is designed around the TMS320VC5507, a DSP with an onboard USB interface from Texas Instruments. The MMB0 also has 16MB of SDRAM installed. The MMB0 is not sold as a DSP development board, and it is not available separately. TI cannot offer support for the MMB0 except as part of an EVM kit.
Page 17: Using The +6V Wall Supply For +5V
Connecting the Power Supply The ADS1259EVM-PDK can be operated with a combination of +5V and bipolar (±10V to ±15V) supply. When the MMB0 DSP is powered properly, LED D2 glows green. The green light indicates that the 3.3V supply for the MMB0 is operating properly. (It does not indicate that the EVM power supplies are operating properly.)
Page 18: Mmb0 Configured For Lab Power Supply
It is not necessary to connect a +5V dc supply voltage to the +5VA terminal on J14 if the +5V/+5VA position on J13 is shorted. ADS1259EVM, ADS1259EVM-PDK SBAU163A – March 2010 – Revised April 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 19: Ni-Visa Driver Installation Wizard, Screen
The program for evaluating the ADS1259EVM-PDK is called ADCPro. This program uses plug-ins to communicate with the EVM. The ADS1259EVM-PDK plug-in is included in the ADS1259EVM-PDK package.
Page 20: Ni-Visa Driver Installation Wizard, Screen
ADS1259EVM-PDK Operation www.ti.com Figure 18. NI-VISA Driver Installation Wizard, Screen 2 Figure 19. NI-VISA Driver Installation Wizard, Screen 3 ADS1259EVM, ADS1259EVM-PDK SBAU163A – March 2010 – Revised April 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 21: Ni-Visa Driver Installation Wizard, Screen
Windows Device Manager and locating the drivers as shown in Figure Figure 21. NI-VISA Driver Verification Using Device Manager SBAU163A – March 2010 – Revised April 2010 ADS1259EVM, ADS1259EVM-PDK Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 22: Adcpro Software Start-Up Display Window
1. Start the software by selecting ADCPro from the Windows Start menu. The screen in Figure 22 appears. Figure 22. ADCPro Software Start-up Display Window ADS1259EVM, ADS1259EVM-PDK SBAU163A – March 2010 – Revised April 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 23: Ads1259Evm-Pdk Plug-In Display Window
Figure 23. ADS1259EVM-PDK Plug-In Display Window 3. The ADS1259EVM-PDK plug-in window has a status area at the top of the screen. When the plug-in is first loaded, the plug-in searches for the board. You will see a series of messages in the status area indicating this action.
Page 24: Install New Driver Wizard Screen 1
ADS1259EVM-PDK Operation www.ti.com Figure 24. Install New Driver Wizard Screen 1 Figure 25. Install New Driver Wizard Screen 2 ADS1259EVM, ADS1259EVM-PDK SBAU163A – March 2010 – Revised April 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 25: Install New Driver Wizard Screen 3
ADS1259EVM-PDK Operation www.ti.com Figure 26. Install New Driver Wizard Screen 3 Figure 27. Install New Driver Wizard Screen 4 SBAU163A – March 2010 – Revised April 2010 ADS1259EVM, ADS1259EVM-PDK Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 26: Install New Driver Wizard Screen 5
Figure 29. USBStyx Driver Verification Using Device Manager The driver installation wizard sequence should not appear again, unless you connect the board to a different USB port. ADS1259EVM, ADS1259EVM-PDK SBAU163A – March 2010 – Revised April 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 27: Evaluating Performance With The Adcpro Software
You can adjust the ADS1259EVM settings when you are not acquiring data. During acquisition, all controls are disabled and settings may not be changed. When you change a setting on the ADS1259EVM plug-in, the setting immediately updates on the board. Settings on the ADS1259EVM correspond to settings described in the...
Page 28: Adc Configuration Tab
10.1.3 ADC Configuration Tab The first tab for the ADS1259EVM is the ADC Configuration Tab. This set of controls is used primarily for setting up the operation for the ADS1259. This tab is broken up into three subsections. The ADC...
Page 29: Adc Calibration Tab
A calibration feature is integrated into the ADS1259 to correct for offset and gain errors. The ADS1259EVM-PDK software is designed to allow the user to use the built-in system calibration commands or manually calibrate the device by directly entering the values for the offset and gain registers of the ADS1259.
Page 30: Pga Configuration Tab
Note that the buffer is only enabled with a change of the MUX value. For further information about the use of the current buffer, see the PGA280 data sheet. ADS1259EVM, ADS1259EVM-PDK SBAU163A – March 2010 – Revised April 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 31: Pga Gpio Tab
Note that the control for setting the GPIO values in Mux mode is in the PGA Configuration tab, described Section 10.1.5. The remaining four GPIO pins (GPIO3-GPIO6) are reserved in ECS mode to control the ADS1259. SBAU163A – March 2010 – Revised April 2010 ADS1259EVM, ADS1259EVM-PDK Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 32: Pga Input Switch Tab
Click on the switch to enable or disable the switch. For more information about switch function and control, see the Input Switch Network section of the PGA280 data sheet. Figure 36. PGA Input Switch Tab ADS1259EVM, ADS1259EVM-PDK SBAU163A – March 2010 – Revised April 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 33: Ads1259Evm, Ads1259Evm-Pdk
Note that as the device powers up for the first time, these error flags may be set. If you are going to use these flags, it is important to first clear them after the part has settled after start up. SBAU163A – March 2010 – Revised April 2010 ADS1259EVM, ADS1259EVM-PDK Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 34: Evm Software About Tab
The Plug-in Version and Firmware Version indicators show the version numbers of the plug-in and firmware code, respectively. The Notes indicator may show relevant notes about the plug-in or firmware code, if there are any. ADS1259EVM, ADS1259EVM-PDK SBAU163A – March 2010 – Revised April 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 35: Schematics And Layout
If ADCPro stops responding while the ADS1259EVM-PDK is connected, try unplugging the power supply from the PDK. Unload and reload the plug-in before reapplying power to the PDK. Schematics and Layout Schematics for the ADS1259EVM are appended to this user's guide. The bill of materials is provided in Table 11.1 Bill of Materials Table 4.
Page 36 Schematics and Layout www.ti.com Table 4. ADS1259EVM Bill of Materials (continued) Item RefDes Quantity Description Part Number RB3, RB4 Resistor, Thick Film Chip 10Ω, 1%, 1/10W, Size = 0603 ERJ-3EKF10R0V Panasonic Resistor, Thick Film Chip 10kΩ, 5%, 1/10W, Size = 0603...
Page 37: Top Silk Image
Schematics and Layout www.ti.com 11.2 PCB Layout NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid out; they are not intended to be used for manufacturing ADS1259EVM PCBs. Figure 40 through Figure 44 show the PCB layouts for the ADS1259EVM.
Page 38: Internal Layer 2 (Layer 3)
Corrected descriptions of pins 11.8 and 11.9 in Table 3 NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Revision History SBAU163A – March 2010 – Revised April 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated...
Page 39 DVDD AVDD AVDD REFN REFP 100K FRC_BAT54 Ref+ Ref- ONS_MMBZ5231BLT1 10uF SW-DPDT VOUT 22uF TEMP AVSS FRC_BAT54 CR10 TRIM 10uF-tant REF5025ID 10uF CALIBRATION AVSS OFFSET GAIN J7A (TOP) = SAM_TSM-110-01-L-DV-P JPR-1X3 J7B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K REFOUT CNTL GPIO0 CLKX DGND AVDD CLKR GPIO1...
Page 40 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.
Page 41 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.

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