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User's Guide

SLAU262C– January 2009– Revised May 2011

ADS79xxEVM and ADS79xxEVM-PDK

Figure 1. ADS7953EVM (Left) and ADS7953EVM-PDK (Right)

This users guide describes the characteristics, operation, and use of the ADS7953EVM, ADS7957EVM

and ADS7961EVM, both by themselves and as part of the ADS7953EVM-PDK, ADS7957EVM-PDK or

ADS7961EVM-PDK. These evaluation modules (EVMs) are evaluation boards for the ADS7953, a 12-bit,

16-channel, successive approximation register (SAR) analog-to-digital converter (ADC), and the ADS7957

and ADS7961, which are 10-bit and 8-bit variations of the ADS7953. The EVM allows evaluation of all

aspects of the ADS7953, ADS7957 or ADS7961 device. Complete circuit descriptions, schematic

diagrams, and bills of material are included in this document.

The following related documents are available through the Texas Instruments website at http://www.ti.com.

ADCPro is a trademark of Texas Instruments.

Microsoft, Windows XP are registered trademarks of Microsoft Corporation.

C is a trademark of NXP Semiconductors.

All other trademarks are the property of their respective owners.

SLAU262C– January 2009– Revised May 2011 ADS79xxEVM and ADS79xxEVM-PDK

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Summary of content (32 pages)

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User's Guide SLAU262C – January 2009 – Revised May 2011 ADS79xxEVM and ADS79xxEVM-PDK Figure 1. ADS7953EVM (Left) and ADS7953EVM-PDK (Right) This users guide describes the characteristics, operation, and use of the ADS7953EVM, ADS7957EVM and ADS7961EVM, both by themselves and as part of the ADS7953EVM-PDK, ADS7957EVM-PDK or ADS7961EVM-PDK.
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www.ti.com 1 2 3 4 5 6 7 8 9 Contents EVM Overview ............................................................................................................... 3 Analog Interface ............................................................................................................. 4 Digital Interface .............................................................................................................. 5 Power Supplies ......................................................................
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EVM Overview www.ti.com 1 EVM Overview Table 1. EVM-Compatible Device Data Sheets 1.
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Analog Interface 2 www.ti.com Analog Interface For maximum flexibility, the ADS7953EVM is designed for easy interfacing to multiple analog sources. 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 P1. This header/socket provides access to the analog input pins associated with CH0-CH7 of the ADS7953. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options.
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Digital Interface www.ti.com 3 Digital Interface 3.1 Serial Data Interface The ADS7953EVM 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 P2. This header/socket provides access to the digital control and serial data pins of the ADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options.
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Power Supplies 4 www.ti.com Power Supplies P3 is the power-supply input connector. Table 5 lists the configuration details for P3. Only +5V analog and +5V digital is required to power the EVM. If desired, a jumper option (W6) is provided to supply the ADS7953 digital core with +3.3V. Table 5. P3 Configuration: Power-Supply Input Pin No. Pin Name J3.1 +VA +10V to +15V No J3.2 –VA –10V to –15V No J3.3 +5VA +5V analog supply Always J3.4 –5VA –5V analog supply No J3.
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EVM Operation www.ti.com 6.3 ADS7953EVM-PDK Power Supply The analog portion of the ADS7953EVM can either be powered by a 5V source generated via ac adapter or by applying the +5VA to the connector on the MMB0 board. The MMB0 board will provide the digital 5V and 3.3V to the ADS7953EVM. To provide +5VA to the ADS7953EVM from the MMB0 board, make sure the jumper at J13 (on the MMB0) is closed from +5V to +5VA. 6.
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ADS7953EVM-PDK Kit Operation 7 www.ti.com ADS7953EVM-PDK Kit Operation This section provides information on using the ADS7953EVM-PDK, including setup, program installation, and program usage. To prepare to evaluate the ADS7953 with the ADS7953EVM-PDK, complete the following steps: Step 1. Install the ADCPro software (if not already installed) on a PC. Step 2. Install the ADS7953EVM-PDK EVM plug-in software. Step 3. Set up the ADS7953EVM-PDK. Step 4.
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ADS7953EVM-PDK Kit Operation www.ti.com Figure 3. MMB0 Initial Setup Step 3. Plug the ADS7953EVM into the MMB0. The female portion of P1, P2 and P3 on the EVM align with male connectors J7, J4 and J5 respective on the MMB0. CAUTION Do not misalign the pins when plugging the ADS7953EVM into the MMB0. Check the pin alignment of P1, P2, and P3 carefully before applying power to the PDK. Step 4.
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ADS7953EVM-PDK Kit Operation 7.3.1 www.ti.com Connecting an AC Adapter An ac adapter can be connected to barrel jack J2 on the MMB0. J2 is located next to the USB connector. The adapter must output 6V-7V dc. The connector must be sleeve-negative, tip-positive. It should have a current rating of at least 2A. Jumper J12 on the MMB0 connects a wall-mounted power supply to the board. To use the wall-mount supply, J12 must be shorted. Figure 4 illustrates how to connect an ac adapter to the MMB0. Figure 4.
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ADS7953EVM-PDK Kit Operation www.ti.com Figure 5. Laboratory Power-Supply Connection 7.4 Running the Software and Completing Driver Installation Note: The software is continually under development. These instructions and screen images are current at the time of this writing, but may not exactly match future releases. The program for evaluating the ADS7953EVM-PDK is called ADCPro. This program uses plug-ins to communicate with the EVM. The ADS7953EVM-PDK plug-in is included in the ADS7953EVM-PDK package.
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ADS7953EVM-PDK Kit Operation www.ti.com Figure 6. NI-VISA Driver Installation Figure 7.
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ADS7953EVM-PDK Kit Operation www.ti.com Figure 8. NI-VISA Driver Installing Figure 9.
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ADS7953EVM-PDK Kit Operation www.ti.com This procedure should complete the installation of the NI-VISA drivers. Verify the proper installation by opening the Device Manager and locating as shown in Figure 10. Figure 10. NI-VISA Driver Verification Using Device Manager Once ADCPro is installed, install the ADS7953EVM-PDK software to allow ADCPro to recognize the evaluation board. 7.4.2 USBStyx Driver Installation Start the software by selecting ADCPro from the Windows Start menu.
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ADS7953EVM-PDK Kit Operation www.ti.com Figure 12. ADS7953EVM-PDK Plug-In Display Window 2. The ADS7953EVM-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. The user will see a series of messages in the status area indicating this action. 3. If the operating system drivers have not been loaded, Windows will display the Windows Install New Driver Wizard sequence (illustrated in Figure 13 through Figure 17).
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ADS7953EVM-PDK Kit Operation www.ti.com Figure 13. Install New Driver Wizard Screen 1 Figure 14.
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ADS7953EVM-PDK Kit Operation www.ti.com Figure 15. Install New Driver Wizard Screen 3 Figure 16.
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ADS7953EVM-PDK Kit Operation www.ti.com Figure 17. Install New Driver Wizard Screen 5 4. Once Windows finishes installing the software driver, the plug-in downloads the firmware to the MMB0. The status area will display Connected to EVM when the device is connected and ready to use. If the firmware does not load properly, try resetting the MMB0 by pressing reset and then reloading the plug-in. 5. Verify the proper installation of the USBStyx driver using the Device Manager.
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Evaluating Performance with the ADCPro Software www.ti.com 8 Evaluating Performance with the ADCPro Software The evaluation software is based on ADCPro, a program that operates using a variety of plug-ins. (The ADS7953EVM plug-in is installed as described in the previous section.) To use ADCPro, load an EVM plug-in and a test plug-in. To load an EVM plug-in, select it from the EVM menu. To load a test plug-in, select it from the Test menu.
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Evaluating Performance with the ADCPro Software 8.1.1 www.ti.com Channel Tab The ADS7953 can acquire from one to sixteen channels sequentially or in a user defined pattern. The Channel Tab (as shown in Figure 19) provides the control to turn each channel on or off. By default, manual channel mode is enabled. In manual mode, any single channel may be selected for conversion. Figure 19.
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Evaluating Performance with the ADCPro Software www.ti.com In addition, the Manual Control button (shown in Figure 20) can be used to enable or disable auto scan modes 1 and 2. Auto 1 Mode allows the selection of any number of channels from the channel selection list. Auto 2 Mode allows the selection of the highest channel to convert. All channels below this will be converted once this selection is made by pressing the 'Accept Selection' button. Figure 20.
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Evaluating Performance with the ADCPro Software 8.1.2 www.ti.com Other Tab The ADS7953 requires a clock to operate. The maximum frequency is selected by default for the different operating modes, providing the maximum 1MSPS throughput rate specified in the datasheet. The clock setting can be modified in this tab by accepting the default SPI or clock stop mode, a continuous clock mode with the fastest possible serial clock, or a continuous clock mode with a variable frequency.
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Evaluating Performance with the ADCPro Software www.ti.com 8.1.3 Alarm Tab The ADS7953 offers configurable alarm outputs for both high and low alarm selections. The configuration of the alarm function takes place in two steps, the first of which is the setting of the alarm limits. In the Alarm Tab, the hex values for high and low limits are entered for each channel requiring the alarm function. To enable the alarm functions, the GPIO Function tab must be considered next. Figure 22.
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Evaluating Performance with the ADCPro Software 8.1.4 www.ti.com GPIO Function Tab The GPIO0, GPIO1, GPIO2 and GPIO3 pins on the ADS7953 can function as simple general purpose inputs/outputs or as specialized control and monitor functions. The alarm function described in the previous section is processed by GPIO0 and GPIO1. Refer to the data sheet for specific details on GPIO0 and GPIO1 options. GPIO2 can be used to configure the input range of the ADS7953 (2.5V max or 5.
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Evaluating Performance with the ADCPro Software www.ti.com 8.1.5 GPIO Tab The GPIO Tab provides a means to monitor and control GPIO functions. If a GPIO is selected in the GPIO Function tab to perform a specialized function, it will appear 'grayed out' in the GPIO tab. For pins configured as GP outputs, a push button will enable the user to set the desired output state. GP Inputs are monitored with an LED display (bright green = logic high). Figure 24.
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Schematic and Bill of Materials 8.1.6 www.ti.com Collecting Data Once the user has configured the ADS7953 for the test scenario, press the ADCPro Acquire button to start the collection of the number of datapoints specified in the Test plug-in Block Size control. The ADS7953EVM-PDK plug-in disables all the front panel controls while acquiring, and displays a progress bar as shown in Figure 25. Figure 25.
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Schematic and Bill of Materials 9.1 www.ti.com 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 TI website.) Table 7. ADS7953EVM Bill of Materials 28 Item No.
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Revision History www.ti.com Table 7. ADS7953EVM Bill of Materials (continued) Item No. Qty Ref Des 24 0 W1 25 6 W2 - W7 Vendor Part Number Not Installed Description Samtec TMS-102-02-G-S 3 Pin , 2mm Header Samtec TMM-103-01-T-S Revision History Changes from B Revision (March, 2011) to C Revision ................................................................................................. Page • Updated Table 5 ........................................................................
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1 2 3 4 6 5 Revision History REV W1 Approved C15 R11 NI AGND ECN Number NI R12 VCC_D 0 +VCC CH0 R25 47.5K R26 47.5K C28 D W4 7 P1 20 17 18 15 16 13 14 11 9 8 5 6 3 4 1 2 3 R10 CH1 Ch0_FLT +In 1 C22 270pF U1 OPA365 2 270pF R9 Ch2_FLT 33 CH5 REF_M 3 REF_P 4 C11 270pF CH6 C27 5 +VCC AGND 6 10uF R8 CH7 C23 Ch3_FLT 33 7 0.
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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.
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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.