AD7607
Production
The AD7607 is a 14-bit, simultaneous sampling, analog-to-digital data acquisition system (DAS). The part contains analog input clamp protection; a second...
Datasheet
AD7607 on Analog.com
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
Hi Gaurav,
That's difficult to support if with the same schematic, some batches work and some doesn't. Schematic looks correct. Can you do the exercise of swapping the IC from a good board and a bad board?
For debugging, I'd suggest checking the PAR/SER pin, RESET pin, or scope the CS with SCLK together.
Regards,
Lluis.