Hi All ,
I have purchased AD7656A-1 ADC for my experimental work. I have configured it for SPI interface using zedboard.
Configuration is on Hardware. Using ALL data line A,B,and C. with internal ref selected.
But there is a problem that I am getting All time same value i.e. -32768 on all channels .
When I measured the voltage across open terminal of analog input to AGND , it was -2.25 V.
What is this mean? Is ADC is no more live?
Here the signals captured by DSO for reference,
Legends are as follows for scop_0:
1- SCLK
2- CONVST
3-CS
4-BUSY
While in scope_1, and _2 :
4th signal is DOUT A , ( when no analog signal is applied)
While in scope_2: 1 volt 500 Hz sine bipolar signal has been applied on V1 analog input using function generator, with OP07 as buffer.
I am unable to find out, what actually happening, why ADC is not capturing signals!
Thanks in Advance,
