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AD7791 Datasheet(PDF) 4 Page - Analog Devices |
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AD7791 Datasheet(HTML) 4 Page - Analog Devices |
4 / 5 page CN-0216 Circuit Note Rev. 0 | Page 4 of 5 Figure 5. Measured Histogram for 500 Samples Showing the Effects of Noise COMMON VARIATIONS Other ADCs and circuits suitable for weigh scale applications are discussed in CN-0102 (AD7190), CN-0107 (AD7780), CN- 0108 (AD7781), CN-0118 (AD7191), CN-0119 (AD7192), and CN-0155 (AD7195). The AD7171 is a 16-bit sigma-delta ADC. For a lower power consumption solution, use the ADA4051-2. The ADA4051-2 is a dual micropower, zero-drift amplifier with only 20 µA of supply current per amplifier. CIRCUIT EVALUATION AND TEST This circuit uses the EVAL-CN0216-SDPZ circuit board and the EVAL-SDP-CB1Z system demonstration platform (SDP) evaluation board. The two boards have 120-pin mating connectors, allowing for the quick setup and evaluation of the circuit’s performance. The EVAL-CN0216-SDPZ board contains the circuit to be evaluated, as described in this note, and the SDP evaluation board is used with the CN-0216 evaluation software to capture the data from the EVAL-CN0216-SDPZ circuit board. Equipment Needed • PC with a USB port and Windows XP or Windows Vista (32-bit), or Windows 7 (32-bit) • EVAL-CN0216-SDPZ circuit evaluation board • EVAL-SDP-CB1Z SDP evaluation board • CN0216 evaluation software • Tedea-Huntleigh 505H-0002-F070 load cell or equivalent • Power supply: +6 V, or +6 V “wall wart” Getting Started Load the evaluation software by placing the CN0216 Evaluation Software disc in the CD drive of the PC. Using My Computer, locate the drive that contains the evaluation software disc and open the Readme file. Follow the instructions contained in the Readme file for installing and using the evaluation software. Functional Block Diagram See Figure 1 of this circuit note for the circuit block diagram, and the PDF file “EVAL-CN0216-SDPZ-SCH” for the circuit schematics. This file is contained in the CN0216 Design Support Package. Setup Connect the 120-pin connector on the EVAL-CN0216-SDPZ circuit board to the connector marked “CON A” on the EVAL-SDP-CB1Z evaluation (SDP) board. Nylon hardware should be used to firmly secure the two boards, using the holes provided at the ends of the 120-pin connectors. Connect the load cell the EVAL-CN0216-SDPZ board. With power to the supply off, connect a +6 V power supply to the pins marked “+6 V” and “GND” on the board. If available, a +6 V "wall wart" can be connected to the barrel jack connector on the board and used in place of the +6 V power supply. Connect the USB cable supplied with the SDP board to the USB port on the PC. Note: Do not connect the USB cable to the mini USB connector on the SDP board at this time. Test Apply power to the +6 V supply (or “wall wart”) connected to EVAL-CN0216-SDPZ circuit board. Launch the evaluation software and connect the USB cable from the PC to the USB mini-connector on the SDP board. The software will be able to communicate to the SDP board if the Analog Devices System Development Platform driver is listed in the Device Manager. Once USB communications are established, the SDP board can now be used to send, receive, and capture serial data from the EVAL-CN0216-SDPZ board. Information and details regarding how to use the evaluation software for data capture can be found in the CN0216 Evaluation Software Readme file. Information regarding the SDP board can be found in the SDP User Guide. Analyzing the Data At least 500 samples of the ADC output data should be taken. Once the sample set is exported to a spreadsheet program, such as Excel, the samples can be analyzed. The standard deviation of the samples is approximately equal to the rms noise, assuming a Gaussian noise distribution. The peak-to-peak noise is approximately equal to the rms value multiplied by 6.6. The peak-to-peak noise can also be taken directly from the sample set by simply taking the difference between the largest and smallest sample. In practice, the results obtained using this |
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