I'm considering an AD7606B for its channel count, oversampling capability and ease of synchronisation.
I am trying to digitise a modulated 5kHz sine wave carrier (from 4, 8 or more sources) and need to acquire 8 samples per cycle (40ksps) for a lock-in correlating demodulator. Demodulated bandwidth is about 1 to 2kHz. I intend to clock the ADC at 640kHz and use the oversampling function to achieve 40ksps. 16 bits of resolution is sufficient but 18 would be better (limited by Johnson noise).
A range of signals are to be connected, hence the need for 10V to ~20mV range. Can you suggest an appropriate additional PGA?
I also need to allow some future-proofing by perhaps increasing the data rate (by reducing the oversampling). This is a nice-to-have for product specmanship.
Is this an appropriate ADC? I have also considered AD7771 and AD7768 (and ADS8688).
FYI, I am considering using and AD9542 to derive the 640kHz clock from a distributed 5kHz system clock (covered in another post)
Am I on the right track?
Thanks in advance,
[edited by: Lluis at 8:41 AM (GMT 0) on 20 Apr 2020]