AD9204-80EBZ SPI communication problem: no response

Hello Bastian,

Thank you for your interest in AD9204.

Your query is acknowledged. Kindly give time for the product owner to look into this and provide their response.

Thanks.

Hi Bastian ,

Thank you for your interest in AD9204.

Here's some things I'd like you to try.

1. Could you try lowering your SCLK speed maybe about 1MHz at first? Just until the SPI is confirmed working and work your way up to the desired frequency later on.
2. The NC7WZ07P6X is an open-drain output, please try keeping the MOSI in high state after sending the 16bit read instruction.

Let me know if there is an improvement.

Best regards,
Peevee

Hello,

thanks for the answer. I tried your suggestions, unfortunately there is no improvement. I attached pictures with the new settings.

I also measured AVDD and DRVDD, both are around 1.8V. Does the DRVDD needs to be around 3.3 for internal reference (because my SAM board sets the high lvl to around 3.3)? I run the Board on default mode. The datasheet states, that a 3.3V powersupply might be needed but I thought this would only be the case if i remove the ferrite beads. If I go to table 3 it states that LOGIC INPUTS are max. DRVDD + 0.3 .

I will try to talk to a different ADC (AD7888) to see if there is a Problem with the ADC or with the SAM µC.

Do I need to write any register before reading the Chip ID?

Kindly,

Sebastian

Hello,

I got some new behaviour. If I "read" multiple Bytes with chip select inactive between them i get this periodic signal: