Products In This Thread

ADAU1761 Production
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...
Datasheet
ADAU1761 on Analog.com

ADAU1761 IMPEDANCE MATCHING AND GAIN

Vinaybhatt

on Sep 17, 2023

Category: Hardware

Product Number: ADAU1761

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?

0 DaveThib

on Sep 26, 2023 12:28 PM
Hello Vinaybhatt,

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.

Selection Table for Class-D Audio Amplifiers | Parametric Search | Analog Devices

You might have some solutions for the preamp by looking at the selection guide for preamps.

Selection Table for Microphone Pre-Amp Audio Interfaces | Parametric Search | Analog Devices

There are just so many different options that I cannot just give you an answer based on one sentence.

Dave T
Cancel
Up 0 Down

Reply

Verify Answer

Cancel