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AD9432BSQZ-80 Datasheet(PDF) 13 Page - Analog Devices |
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AD9432BSQZ-80 Datasheet(HTML) 13 Page - Analog Devices |
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13 / 20 page  REV. E AD9432 –13– DATA OUTPUTS The ADC digital outputs are latched on the board by two 574s; the latch outputs are available at the 37-pin connector at Pins 25–36. A latch output clock (data ready) is available at Pin 21, with the complement at Pin 2. There are series termination resistors on the data and clock outputs. These can be changed if required to accommodate different loading situations. Figure 16 shows a data bit switching and output clock (DR) at the connector. T CH2 CH1 1.00V 1.00V M 5.00ns CH1 1.20V 2 [T] 265 ACQS C1 MAX 3.06V C1 MIN –390mV C1 FREQ 105.4562MHz STOP: TEK 5.00GS/s Figure 16. Data Bit and Clock at 37-Pin Connector REFERENCE The AD9432 has an on-chip reference of 2.5 V available at VREFOUT (Pin 46). Most applications will simply tie this output to the VREFIN input (Pin 45). This is accomplished jumping E4 to E6 on the board. An external voltage reference can drive the VREFIN pin if desired by strapping E4 to E3 and placing an AD780 voltage reference on the board (not supplied). DAC The evaluation board has an on-board reconstruction DAC (AD9752). This is placed only to facilitate testing and debug of the board. It should not be used to measure the performance of the ADC, as it will not accurately indicate the ADC performance. The DAC output is available at SMB P1. It will drive a 50 Ω load. Provision to power down the DAC is at Pin 15 at the DAC. PCB LAYOUT The PCB is designed on a four-layer (1 oz. Cu) board. Compo- nents and routing are on the top layer with a ground flood for additional isolation. Test and ground points were judiciously placed to facilitate high-speed probing. A common ground plane exists on the second layer. The third layer has three split power planes, two for the ADC and one for support logic. The DAC, components, and routing are located on the bottom layer. TROUBLESHOOTING If the board does not seem to be working correctly, try the following: • Verify power at IC pins. • Check that all jumpers are in the correct position for the desired mode of operation. • Verify VREF is at 2.5 V. • Try running encode clock and analog inputs at low speeds (10 MSPS/1 MHz) and monitor 574 outputs, DAC output, and ADC outputs for toggling. The AD9432 Evaluation Board is provided as a design example for customers of Analog Devices, Inc. ADI makes no warranties, express, statutory, or implied, regarding merchantability or fitness for a particular purpose. |
Similar Part No. - AD9432BSQZ-80 |
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Similar Description - AD9432BSQZ-80 |
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