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Published February 14, 2023 | Accepted Version
Report Open

ADC Cross-Talk: Initial Measurements with Test Board

D'Addario, L.

Abstract

A PCB has been constructed for testing analog-to-digital converter ICs and their input circuits. It includes two Analog Devices HMDAC1511 (called devices B and D) and two Texas Instruments ADS5296A devices (A and C), each of which can digitize 4 signals at 200 MSa/s. They provide 8b per sample and 10b per sample, respectively. For each IC type, one is connected to its analog inputs using differential signaling via an ARJ45 connector, and the other is connected using single-ended (coax) signaling via four MMCX connectors and on-board baluns. The baluns use 1:2 impedance-ratio transformers and all signals are terminated in 100 ohms (differential) at the ADC device. The board layout allows for selecting any of several balun circuit topologies by replacing resistors. The board design is based on that of the CASPER ADC16x250. It has the same form factor and its digital outputs and power use a ZDOK connector, compatible with the ROACH2 FPGA board. Differences include providing bit clock and frame clock from one HMDAC1511 and one ADS5296A (vs. bit clock only), and supporting the ADS5296A's register readback feature. This report gives some initial test results. Crosstalk among the 8 signals into the two HMDAC1511 devices was measured. Tests involving the ADS5296A devices await necessary modifications to the available FPGA code.

Attached Files

Accepted Version - memo6.pdf

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Additional details

Created:
October 9, 2023
Modified:
January 15, 2024