I am currently working on a project that requires sampling from a MEMs microphone at 500ksps at 16-bits, with the goal of recording ultrasonic sounds from bats.
After much research I believe the AD4010 would suit, but I have a few questions.
- In regards to the input, the MEMs microphone I will be using is analogue, and has an internal pre-amp, this means the output impedance is 400 ohms - would this be sufficient to drive the input to the ADC, or do I still need a buffer/driver?
- Is a digital decimation filter necessary on the output, or can I do this using a DSP?
- Would the AD4010 be suitable for ADC conversion for extended periods (a few minutes at a time)?
- And do you have any suggestions on a design for an anti-aliasing filter with programmable cutoff frequency?
Thank you for your time!