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CIRCUIT060088

Transimpedance amplifier (TIA) microphone amplifier circuit

CIRCUIT060088

Overview

This circuit uses an op amp in a transimpedance amplifier configuration to convert the output current from an electret capsule microphone into an output voltage. The common mode voltage of this circuit is constant and set to mid–supply eliminating any input–stage cross over distortion.
Features
  • Input pressure (Max) = 1000 dB SPL(2Pa)
  • Output voltage (Max) = 1.228 Vrms
  • Supply:
    • Vcc = 5 V
    • Vee = 0 V
  • Frequency response deviation @ 20Hz = -0.5 dB
  • Frequency response deviation @ 20kHz = -0.1 dB
General-purpose op amps
OPA172 — Single, 36-V, 10-MHz, low-power operational amplifier TLV6741 — Single, 5.5-V, 10-MHz, low noise (4.6-nV/√Hz) operational amplifier
Precision op amps (Vos<1mV)
OPA192 — High-Voltage, Rail-to-Rail Input/Output, 5µV, 0.2µV/˚C, Precision Operational Amplifier
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Technical documentation

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Type Title Date
* Circuit design TIA microphone amplifier circuit (Rev. A) PDF | HTML 26 Sep 2024
User guide Single-Supply Electret Microphone Preamplifier Reference Design 02 Feb 2015

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PSPICE-FOR-TI — PSpice® for TI design and simulation tool TINA-TI — SPICE-based analog simulation program
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ANALOG-ENGINEER-CALC — Analog engineer's calculator

Reference designs

REFERENCE DESIGN
TIPD181 — Single-Supply, Electret Microphone Preamplifier Reference Design

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