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AD7980 Ref Input Driven by AD780

Thread Summary

The user asked if a buffer is needed between the AD7980's REF input and AD780's output, given AD780's built-in buffer. The engineer explained that while the AD780's load regulation is 75uV/mA, the AD7980's REF current can peak at 2.5mA, potentially causing more than 1 LSB error. The user decided to switch to the LT6658A-2.5, which has better load regulation (0.25uV/mA), likely eliminating the need for a buffer. The engineer confirmed this and emphasized the importance of using a REF decoupling capacitor as specified in the AD7980 datasheet.
AI Generated Content

Hi Team,

I am planning to use AD7980 with AD780. Do I need to use a buffer between AD7980's ref input and AD780's output? From the datasheet of AD780, it looks like it already has a built-in buffer.

Thanks.

Edit Notes

Adding tags to post for internal tracking purposes.
[edited by: tschmitt at 6:54 PM (GMT -4) on 18 Sep 2020]

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