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MAX9810, MAX9810A, MAX9810B, MAX9810C

Electret Condenser Microphone Cartridge Preamplifier

The MAX9810 microphone preamplifier is intended for use inside electret condenser microphone (ECM) cartridges. The MAX9810 replaces the FET currently used with a high-gain, high-noise rejection, low output-impedance amplifier.
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Description

The MAX9810 microphone preamplifier is intended for use inside electret condenser microphone (ECM) cartridges. Current solutions use a FET as an impedance converter. FETs have limited gain, are susceptible to noise and require additional components external to the ECM cartridge for biasing and amplification. The MAX9810 replaces the FET with a high-gain, high-noise rejection, low-output-impedance amplifier. Designed to be integrated inside the ECM cartridge, the MAX9810 offers a flat frequency response, tightly controlled gain, increased sensitivity, and high-noise rejection greatly simplifying system design. Target applications include ECM cartridges in cell phones, PDAs, notebooks, and other portable audio devices.

The MAX9810 operates from a single 2.3V to 5.5V supply and consumes only 670µA of quiescent current. The device features an internally generated 1.5V DC bias and is available in three internally fixed gain options (24dB, 27dB, and 30dB). The MAX9810 is specified over the extended temperature range (-40°C to +85°C) and comes in a tiny 4-bump chip-scale package (UCSP™) that is designed to fit inside the ECM cartridge.

Data Sheet

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Key Features

  • Replaces FET in Electret Condenser Microphone
  • 2.3V to 5.5V Single-Supply Operation
  • Low-Impedance Output (<0.4Ω)
  • High PSRR: 82dB
  • Three High-Gain Options:
    • MAX9810A: 24dB
    • MAX9810B: 27dB
    • MAX9810C: 30dB
  • Internal Bias Voltage
  • Low Supply Current (670µA)
  • Rail-to-Rail Output
  • No Output Phase Reversal During Overload Conditions
  • Available in a Tiny 4-Bump UCSP
 

Applications/Uses

  • Cell Phones
  • Electret Condenser Microphone Cartridges
  • Notebook Computers
  • PDAs
  • Portable Audio
   

Diagram

MAX9810: Typical Operating Circuit
Typical Operating Circuit

Notes and Comments

The MAX9810 is a unique amplifier that is designed to be placed inside the microphone.

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Document Ref.: 19-2515 Rev 0; 2002-08-16
This page last modified: 2007-07-13