|Originally posted by Wodgy
Glassman, you have a very poor understanding about this stuff. The AD1852 uses an 8x oversampling digital filter. The ultrasonic noise floor is flat to -120dB all the way up to 176.4 kHz, at which point you get noise from the sigma-delta modulator. This is so far from the audio band that it really doesn't matter.
edit: it's not flat to 176.4kHz.. 8x oversampling means 352.8kHz, which is a total bandwidth where the filter can act.. and it acts from ~22kHz to ~330kHz, which is a stop band with -110dB