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Tool/software:
Hello,
I was trying to test ADS4149 on my board and have attached the schematic of my board. I did following tests.
1) I disconnected inputs of the ADS4149(unmounted R98, R98, C94, C93 in my board) and captured the digital output in my FPGA. I got approx. 0.90V. Is this the correct behavior of ads4149?
2) I further removed biasing of inputs(unmounted R96, R97) and captured again. This time also I got 0.90V. Pl confirm about this test also.
Hi Ankur,
Yes, the analog input should be sitting at a DC value of 0.9V. This the common mode DC bias on both of those analog input pins.
Regards,
Rob