Quick Start Guide

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Quick Start Guide for using the Triggered Capture Feature of the HSC-ADC-EVALEZ FMC Capture Board with the AD9656 ADC Evaluation Board

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TYPICAL SETUP

Figure 1. AD9656 Evaluation Board and HSC-ADC-EVALEZ FMC Data Capture Board

EQUIPMENT NEEDED

• 6V 2A switching supply (such as CUI EPS060250UH-PHP-SZ) (optional)

• 12V, 3 A switching power supply

• Analog signal source and anti aliasing filter (if test signal is to be applied)

• Analog Clock source (if not using the on-board crystal)

• PC running Windows

• USB 2.0 port recommended (USB 1.1 compatible)

• AD9656 Evaluation Board (AD9656-65EBZ)

• HSC-EVALEZ FMC FPGA Data Capture Board

HELPFUL DOCUMENTS

• AD9656 User Guide - http://wiki.analog.com/resources/eval/ad9656-125ebz

• VisualAnalog Converter Evaluation Tool User Manual, AN-905

AD9656 Quickstart Guide

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• High Speed ADC SPI Control Software User Manual, AN-878

• Interfacing to High Speed ADCs via SPI, AN-877

SOFTWARE NEEDED

• VisualAnalog ( http://www.analog.com/en/converters-tools/adc-tools/topic.html )

• SPIController ( http://www.analog.com/en/converters-tools/adc-tools/topic.html ) Documents are available at http://www.analog.com. For any questions, please send an email to highspeed.converters@analog.com.

TESTING

1. Setup the AD9656 evaluation kit as described in the AD9656 User Guide ( http://wiki.analog.com/resources/eval/ad9656-125ebz ). Verify that the evaluation kit is converting and processing data as specified in the User Guide.

2. Additionally, hardware connections to the SMA connectors J201 and J202 (see Figure 1) are needed. The voltage on J202 will be monitored. A 0V � 2.5V rising edge will be applied to J201 to trigger capture.

3. In VisualAnalog, navigate to the Samples Canvas: File � New . . .

4. Select the Samples Canvas. It will look something like the following picture. Push the Settings button on the ADC Data Capture block.

Evaluation Board QuickStart

Guide QS-AD9656-Trig

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5. Pushing the Settings button will bring up a window with three tabs. In the General tab select which channel to capture. One channel is shown here, but multiple channels can be selected. Sample/capture depth is also specified here. Note that the sum total capture depth of all channels cannot exceed 256k.

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6. In the Capture Board tab, check the Poll Full Flag box, and enter a number like 10000 into the Maximum Poll Time (ms) field. The purpose for this number will be seen later.

7. In the Device tab, check the Enable External Trigger box. Push OK.

8. Push the Run button on the VisualAnalog top bar

Evaluation Board QuickStart

Guide QS-AD9656-Trig

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9. You will see the voltage on J202 rise from a few millivolts up to 2.5V. This indicates that the system is ready to capture data, triggered by an edge to be applied to J201.

10. Apply a rising edge (2.5V) on J201. This edge needs to be applied before the end of the Poll Time interval specified in Step 6. If 10000 was entered in Step 6, you will have 10000 milliseconds from when the voltage on J202 went to 2.5V, to apply the edge. After the data is captured take J201 low again. The pulse on J201 must be longer than 6.25ns, and also long enough to allow for capturing the specified sample depth.

11. Data that was captured will appear graphically on the VisualAnalog canvas. 12. To store the captured data, push the Settings button on the graph window.

13. This brings up a Graph Settings window. In the General tab, check the Save Files box within the Data Files field.

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14. In the Data Settings tab, check the boxes indicated below. Push the Browse . . . button to navigate to the location where data is to be stored, and enter desired filename.

15. Optional Step: In the Graph Window tab, the Float automatically check box is checked by default. This causes the graph to pop-up and “float” when the Run button is pushed. To disable this, uncheck this box. Push OK to save the settings and close the window.

Evaluation Board QuickStart

Guide QS-AD9656-Trig

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16. Start at Step 8 again. Note that the voltage on J202 will still be high from the previous action. When the rising edge is applied to J201, a .csv file containing the time domain samples will be written to the location specified in Step 14.

STEPS FOR PERIODIC TRIGGERED CAPTURE

As mentioned in Step 10, a rising edge on J201 triggers capture. Periodic pulses can be applied to J201 to trigger capture at precise instants.

1. Connect the trigger pulse source to J201. NOTE: There is a board anomaly that causes the necessity for J201 to be actively driven either low or high (2.5V) for triggered capture. If J201 is left floating, the board will capture when the Run button is pushed (as if it is not in triggered capture mode), even though it is configured for triggered capture.

2. Push the Run button. The system will wait until the next pulse on J201. 3. With the system configured to save the captured data, a set of data will be captured and saved for every push of the Run

button.