i want ADAU 1761 CODEC mic input level to be 0.7 volt , 150 ohm and output level at speaker to be 20 Vrms, 600 ohm. What circuit and part nos are suggested for this using op amp?
The ADAU1761 is a low power, stereo audio codec with integrated digital audio processing that supports stereo 48 kHz record and playback at 14 mW from...
ADAU1761 on Analog.com
This is a large design nut just simply a few parts to use in front or after the codec/DSP. A 150ohm mic input preamplifier will be a significant design and the easiest would probably be to use a transformer. What kind of microphone are you using?
Then 20Vrms into 600 ohms is significant level!! +28dBu and into 600 ohms means it will be dissipating almost 3/4W! This is approaching a power amplifier so it would have to be more than just a standard OpAmp on the output.
So this means you need a speaker amplifier. Here is our selection guide for Class-D amplifiers.
You might have some solutions for the preamp by looking at the selection guide for preamps.
There are just so many different options that I cannot just give you an answer based on one sentence.