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ADS7949, Data conversion is not being performed

Other Parts Discussed in Thread: ADS7949

Hi,

We are using ADS7949 ADC for our customer project. I have attached the schematics for the same. The voltage levels and timings are conforming to specifications provided in data sheet. But still we are getting a value of zero on MISO pin, no matter whatever is input voltage. Only value that I am suspecting is set up time(tsu1) which is 3.5nS, where as we are getting it at 3ms as we are driving chip select with GPIO line.

Please note that pin number 7 and 8 are interchanged in schematic but on circuit it is proper.

We saw same behavior on two different boards.

2251.ADC_circuit.pdf