AD5762 not working properly, Voltage is not updated according to input register value

Hi NithinAntoT,

Could you provide any oscilloscope screenshot to verify that the SPI transfers don't violate any timing constraints?

Best regards

Paco

Hey guys, I am using Ad5762 IC, On my pcb, It is connected to spi with clock 10mhz, in mode 0, The digital reference voltage is 5V and Analog voltage is plus or minus 15Volt. When i power the device i get an Output voltage of -10v. I could not change the output voltage. I tried clearing the output voltage and i could not do it. I refered the timing diagram of datasheet and tried again still i had no luck. I have tried everything. I need help here.

Blue: LDAC signal, Green: Data(sdi), Yellow: SYNC Pulse

More images

Hi NithinAntoT,

in the timing diagram of the datasheet you can see that the sampling edge is the falling edge

so, you must use SPI modes 1 or 3, but not 0. 

you can find a useful AN on that at Introduction to SPI Interface | Analog Devices

Best regards

Paco

I tried different spi modes including mode 1 and 3. Nothing seemed to work.

let's check other things.

1. Could you please check the timing around the rising edge of the SYNC (CS) signal to verify that the timing parameters are observed?

meanwhile I will check the sch you just shared.

ok I will check my part.

the sch looks correct altough it is not showing the connections of RSTIN, DAC_REF1 and 2SCOMP that are important signals.

could you please measure the value of TEMP? it should be, according to the DS, a value of 1.47v, this way we can know if the part is alive.

Another option is to test you controller with the AD5764R EVB EVAL-AD5764R Evaluation Board | Analog Devices