I have a question from our customer about settling time of AD7175-8.
The condition is followings,
- Multiple Channels sampling
- Number of channels to sample : 8 (Channel0~Channel7)
- Single Conversion Mode
- ODR = 125,000 (41.667) -> settling time is 24us from the table 19,20 in data sheet
- Delay = 0
- Digital filter : Sinc5+Sinc1
This customer expects that the /DRDY occur at 24us after sending 0x8010 to AD7175-8.
But the first /DRDY occur at 46us after command 0x8010.
And the second to eighth /ODR occur at 13us after command 0x8010.
I'm guessing that the 46us is include the time to start-up sigma-delta modulator from standby.
Then I would like to know about two points.
Q1. I would like to know the reason why the first /DRDY need 46us.
Q2. Why the second to eighth /DRDY are shorter than 24us ?
Customer wants to operate at 4kHz ODR with single conversion mode.
But it seems does not have a timing margin.