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DAC7565: External reference timing

Part Number: DAC7565

Dear Team,

My customer needs a DAC with 1.8V logic level for their new project and they picked up DAC7565.

They would like to supply an external reference voltage for the device, but datasheet states that internal reference should be turned off through SPI. It states internal and external references should not be supplied at the same time.

The question is that is it OK to supply if they supply the external supply immediately after the device is powered on and then turn off the internal reference. In this case, both will be active for very short period of time. or should they turn off the internal supply first before supplying the external reference?

 

By the way, any other device with 12-bit SPI interface and 1.8V logic capability is also welcome. Please feel free to offer an alternative.

Best Regards,

Caglar