Hello,
I have a question about number of oversample of AD7175-8 from a customer.
There is the comment which is the margin note of table-19 in the datasheet, is are following.
"The settling time is rounded to the nearest microsecond. This is reflected in the output data rate and channel switching rate."
This customer need the precise oversample numbers to explain the specification of his product.
He is using AD7175-8 with
- "SING_CYC=1"
- multiple channels(8ch)
- ODR=125kSPS
I checked the relation between ODR and settling time.
In the table of below, the "Settling time" is same as 1/ODR x "Num of Oversamples" pricisely.
It is not look like the "Settling time" was rounded.
All "number of oversamples" are divisible by "Settling time".
Then I would like to confirm the "Num. of Oversamples".
Is this "Num. of Oversamples", which is in below table, right ?
ODR of Multi-Ch Settling time Num. of Oversamples
50,000 20 us 160
41,667 24 us 192
31,250 32 us 256
27,778 36 us 288
20,833 48 us 384
17,857 56 us 448
12,500 80 us 640
10,000 100 us 800
5000 200 ss 1,600
2500 400 us 3,200
1000 1.0 ms 8,000
500 2.0 ms 16,000
397.5 2.516 ms 20,128
200 5.0 ms 40,000
100 10 ms 80,000
59.92 16.67 ms 133,360
49.96 20.016 ms 160,128
20 50.0 ms 100,000
16.66 60.02 ms 480,160
10 100 ms 800,000
5 200 ms 1,600,000
* "Num. of Oversamples" = "Settling time"/ODR
Best regards,
y-suzuki