DAC81401: How to get better PSRR output?

Hi Jimmy,

Can you please provide the DAC output span (min/max range) so that I can suggest best LDO options for DAC power rails?
Also mention the any specific critical DAC parameter that is needed for the application you looking for.

Thanks,
Sanjay

Hi Sanjay,

DAC output is plus/minus10V. Customer mention provide a good PSRR DAC output.

But I am not sure if PSRR is defined as the output voltage specification of DAC. As far as I know, PSRR is usually the specification of LDO.

Hi Jimmy,

To get best PSRR on the DAC output, please use the TPS7A4700 on AVDD/VDD power pin and TPS7A33 on AVSS power pin. Please have look on other LDOs like TLV767 or TPS7A20. 

We do have a PSSR spec but at lower frequencies.

Thanks,
Sanjay

Hi Sanjay,

Thanks your support. BTW If want to get plus/minus10V. What value of DAC power supply you suggestion? AVDD as 12V?

Hi team,

Due to customer use UCC14240 from 24V to 12V for DAC power supply. But you suggest 12V from low PSRR LDO for AVDD.

Is it possible to lower the output voltage of the LDO slightly (e.g. 11.5V) to power the DAC?

Finally want get +-10V output. Thanks