Texas Instruments ADS794x EVM Series User Manual

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This user's guide describes the characteristics, operation, and use of the ADS794xEVM by itself and as

part of the ADS794xEVM-PDK kit. These evaluation modules (EVMs) allow evaluation of all aspects of

either the

ADS7946

ultralow-power, differential successive-approximation-register (SAR) analog-to-digital converters (ADCs)

with a maximum throughput rate of 2 MSPS. The ADS7945 offers fully-differential input voltages while the

pseudo-differential inputs of the ADS7946 offer single-ended input voltages with small common-mode

noise-cancelling capabilities. Complete circuit descriptions, schematic diagrams, and bill of materials 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.

All other trademarks are the property of their respective owners.

SBAU194 – August 2011

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ADS794xEVM and ADS794xEVM-PDK

ADS794xEVM-PDK

ADS7945

devices (ADS794x). Both devices are 14-bit, dual-channel,

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Summary of Contents for Texas Instruments ADS794x EVM Series

Page 1 ADS7946 offer single-ended input voltages with small common-mode noise-cancelling capabilities. Complete circuit descriptions, schematic diagrams, and bill of materials are included in this document. The following related documents are available through the Texas Instruments web site at http://www.ti.com. Related Documentation...
Page 2: Table Of Contents
P2: Analog Interface Pinout (Samtec 10 x 2) ......................SMA Analog Inputs ....................P1: Serial Interface Header ..............P3 Configuration: Power-Supply Interface Header ..................ADS794xEVM Bill of Materials SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 3: Evm Overview
Complete control of board settings • Easily expandable with new analysis plug-in tools from Texas Instruments The ADS794xEVM-PDK is available for use with a computer. This kit combines the ADS794xEVM board with the DSP-based MMB0 motherboard, and includes ADCPro™ software for evaluation.
Page 4: Analog Interface
The ADS7945 uses two inputs per channel because of its fully differential inputs. The ADS7946 uses one input per channel for its pseudo-differential inputs. SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 5: Ads794Xevm And Ads7945 Analog Inputs
OPA836 in Inverting A1(+) AIN1N (pin 7) Configuration A1( ) - OPA836 in Inverting AIN1P (pin 8) Configuration Figure 1. ADS794xEVM and ADS7945 Analog Inputs SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 6: Ads794Xevm And Ads7946 Analog Inputs
Pin P2.20 is an analog input for an external reference voltage when J2 is in position 2-3. The source that provides this external reference should have a voltage between 2.5 V and the analog power-supply voltage. SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 7: Digital Interface
C bus to communicate with the onboard EEPROM that records the board name and assembly date. It is not used in any form by the ADS794x converter. SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 8: Power Supplies
The selected reference is cleaned with a RC filter and buffered with a OPA350 operational amplifier. CAUTION Digital supply and reference voltage must be at or below the analog supply voltage at all times. SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 9: Evm Operation
5-6K Interface HPA-MCU Interface boards available from Texas Instruments, or the MMB0 if purchased as part of the ADS794xEVM-PDK. For a list of compatible interface and/or accessory boards for the EVM or the ADS794x, see the relevant product folder on the TI web site.
Page 10: Ads794Xevm-Pdk: Software Installation
Step 5. Connect the ADS794xEVM-PDK to the computer with a USB cable. Step 6. Complete the USB driver installation process. Each task is described in the subsequent sections of this document. SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 11: Ads794Xevm-Pdk Plug-In Installer
Figure 4 Figure 5 show the initial and completed installer screenshots, respectively. Figure 4. ADS794xEVM-PDK Plug-In Installer Figure 5. Completed ADS794xEVM-PDK Installer SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 12: Mmb0 Jumper Locations
J13B must be closed. This configuration connects the 5-V analog power supply with the 5-V digital power supply. • J13A must be opened. This setting allows the 5-V analog power supply to be regulated onboard. SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 13: Connecting Ads794Xevm To Mmb0
For dc-coupled unipolar input signals, J6 must be closed. • For dc-oupled bipolar input signals, J6 must be opened. • For ac-coupled signals, J6 must be closed. SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 14: Powering Up Ads794Xevm-Pdk
6.4). The following sections show how to install these drivers. NOTE: Driver prompts may not appear if another PDK kit has been used on the PC before. SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 15: Ni-Visa Driver Installation Prompt
Step 2. Start ADCPro from the Windows Start menu. Step 3. Load the ADS794xEVM plug-in from the ADCPro EVM drop-down menu as Figure 10 illustrates. Figure 10. Loading ADS794xEVM Plug-in From ADCPro SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 16: Usbstyx Driver Installation Prompt
Exit button in the small-pop up window. Step 6. Close ADCPro after the USBStyx driver has been installed. SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 17: Ads794Xevm-Pdk Kit Operation
EVM system motherboard. It is designed around the TMS320VC5507, a DSP with an onboard USB interface from Texas Instruments. The MMB0 also has 16 MB 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 18: Ads794Xevm Plug-In: Device Configuration Tab
ADS794xEVM board revision information. This information should appear after a device is selected. (7) Collection Bar: This feature shows the percentage of data collected during an acquisition session. SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 19: Adcpro Test Plug-Ins
If ADCPro stops responding while the ADS794xEVM-PDK is connected, shut down and restart the ADCPro software. Also, try unplugging the USB cable from the PDK. Unload and reload the plug-in before reapplying power to the PDK. SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 20: Bill Of Materials, Schematics, And Layout
Panasonic ERA-6AEB102V 1/8W, 0805 Resistor, Metal Film Chip, 0.1%, Panasonic ERA-3AEB102V 1/10W, 0603 Resistor, Thick Film Chip, 1%, R5, R6 Panasonic ERJ-3EKF1002V 1/10W, 0603 SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 21 IC D-Type, F-F w/CLR Preset SM8 SN74LVC2G74DCTR Instruments U5, U8 IC Op Amp, R-R Out, 200 MHz, Texas OPA836IDBVT SOT-23 Instruments U6, U7 0.100 Shunt, Black 969102-0000-DA SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 22: Ads794Xevm Pcb: Top Layer
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 ADS794xEVM PCBs. Figure 14. ADS794xEVM PCB: Top Layer Figure 15. ADS794xEVM PCB: Ground Layer SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 23: Ads794Xevm Pcb: Power Layer
Bill of Materials, Schematics, and Layout www.ti.com Figure 16. ADS794xEVM PCB: Power Layer Figure 17. ADS794xEVM PCB: Bottom Layer SBAU194 – August 2011 ADS794xEVM and ADS794xEVM-PDK Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...
Page 24 +5VA UN_POL_VCM +5VA 1000p 4.99 +3.3VD OPA836IDBVT 1000p 1000p 2.2p A1(+) A1(-) Texas Instruments, Inc. PRECISION ANALOG PRODUCTS 0.1u +5VA HIGH-PERFORMANCE ANALOG DIVISION AGND SEMICONDUCTOR GROUP UN_POL_VCM 5411 EAST WILLIAMS BOULEVARD, TUCSON, AZ 85711 USA AGND DESIGNED BY: 1000p TITLE:...
Page 25 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 26 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.
Page 27 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.
Page 28 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...
Page 29 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...
Page 30 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue.

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