Hello ,
I am currently using AD7607 to read analog signal in the range of -+10V , I am interfacing the said IC with SOM , The SPI signal coming from SOM are isolated using ADuM262N1BRIZ. Now the problem is I am able to get busy signal i am also getting 2.5V reference voltage, but i am not getting MISO output of ADC . Please find the schematic attached.
Following are configuration
R47 DNP i.e HBEN
R80= GND using 0E resistor i.e DB15
Reset pull down using 1K resistor
OS[0:2] =000
REF Select = logic 1 , internal reference ( we are getting 2.5V )
Pin 25 floating
Please help . When first batch was manufacture the same sch was working , now in second batch we are getting multiple failure .
is there any fundamental flaw in the schematic ?
Please help me here we are in production phase . We have already manufacture ~2K PCB in batch of 10 . In first batch we did not got such issue , now in second batch we are facing no MISO .
We have also probed the pin the DoutA pin randomly goes high for 10uS & stays low.
Prompt reply will be appreciated .
Gaurav
Pin 24 used as MISO 
PDF
