I have a question.
Could you tell me the dynamic range [dB] of AD1934 at 192kHz please?
It seems that the test conditions on the data sheet was at 48kHz and did not have the score at 192kHz.
Sorry, been super swamped and also had to do some travelling. I just made the measurements. I was looking at all channels driven. A-wtd with the filter set to the nyquist for each sampling rate. The DNR at 48kHz was sitting around 110 dB, Some channels a few tenths higher and some a few tenths lower.
For 96kHz I got about the same, perhaps a slight bit lower but not much.
For 196kHz it was every so slightly better. The best channel was 110.7dB and the worst was 109.9dB.
So it was as I suspected, there is very little difference when changing the sample rates.
As you have seen we only publish the specifications at 48kHz. As far as the DNR specification, I would not expect that to be very different. The bit depth is the same and the digital filters are very similar with the exception of the nyquist frequency difference. So since the quantization noise energy is distributed up to higher frequencies I would expect it to perform even better. The noise is going to be mostly the small amount of dither/quantization noise and any clock/digital noise generated inside and around the part. Most of this will not change very much when changing the sampling frequency. I could go into the lab and make a quick comparison of one part at one temperature if you like. I am not sure how quick I could do this.
Long time no see!
Thank you so much for your answer.
I understand that the value would not change much depending on the Fs.
But I would like you to do the quick comparison for it.
It is because this answer would be the answer for my customer's RFQ.
I'm afraid to say,,, but, I would be really appreciate you if you could estimate when you might get this done please.
Thank you very much.
Oh, I am sorry to hear that you were super busy.
You've been traveling! Nice! Where have you been?
In terms of your answer,
I understand that the prediction you made on the DNR was very precise!
Thank you so much.
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