MAX9814
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MAX9814

Microphone Amplifier with AGC and Low-Noise Microphone Bias

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Integrated Automatic Gain Control Solves Audio Output Level Fluctuations

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $0.82
Features
  • Automatic Gain Control (AGC)
  • Three Gain Settings (40dB, 50dB, 60dB)
  • Programmable Attack Time
  • Programmable Attack and Release Ratio
  • 2.7V to 5.5V Supply Voltage Range
  • Low Input-Referred Noise Density of 30nV/
  • Low THD: 0.04% (typ)
  • Low-Power Shutdown Mode
  • Internal Low-Noise Microphone Bias, 2V
  • Available in the Space-Saving, 14-Pin TDFN (3mm × 3mm) Package
  • -40°C to +85°C Extended Temperature Range
Additional Details
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The MAX9814 is a low-cost, high-quality microphone amplifier with automatic gain control (AGC) and low-noise microphone bias. The device features a low-noise preamplifier, variable gain amplifier (VGA), output amplifier, microphone-bias-voltage generator and AGC control circuitry.

The low-noise preamplifier has a fixed 12dB gain, while the VGA gain automatically adjusts from 20dB to 0dB, depending on the output voltage and the AGC threshold. The output amplifier offers selectable gains of 8dB, 18dB, and 28dB. With no compression, the cascade of the amplifiers results in an overall gain of 40dB, 50dB, or 60dB. A trilevel digital input programs the output amplifier gain. An external resistive divider controls the AGC threshold and a single capacitor programs the attack/release times. A trilevel digital input programs the ratio of attack-to-release time. The hold time of the AGC is fixed at 30ms. The low-noise microphone-bias-voltage generator can bias most electret microphones.

The MAX9814 is available in the space-saving, 14-pin TDFN package. This device is specified over the -40°C to +85°C extended temperature range.

Applications

  • Bluetooth® Headsets
  • Digital Still Cameras
  • Digital Video Cameras
  • Entertainment Systems (e.g. Karaoke)
  • High-Quality Portable Recorders
  • IP Phones/Telephone Conferencing
  • PDAs
  • Two-Way Communicators
Part Models 2
1ku List Price Starting From $0.82

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Documentation

Documentation

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX9814ETD+
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MAX9814ETD+T
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Product Lifecycle

PCN

Jun 20, 2016

- 1612

ASSEMBLY

MAX9814ETD+

PRODUCTION

MAX9814ETD+T

PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

Jun 20, 2016

- 1612

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ASSEMBLY

MAX9814ETD+

PRODUCTION

MAX9814ETD+T

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX9814EVKIT

Evaluation Kit for the MAX9814

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MAX9814EVKIT

Evaluation Kit for the MAX9814

Evaluation Kit for the MAX9814

Features and Benefits

  • 2.7V to 5.5V Single-Supply Operation
  • 20dB of Dynamic Gain Compression
  • Selectable Gain Control
  • Programmable Attack Time
  • Selectable Attack/Release Ratio
  • Low-Power Shutdown Mode
  • Fully Assembled and Tested

Product Detail

The MAX9814 evaluation kit (EV kit) is a fully assembled and tested PCB that is used to evaluate the single-supply MAX9814 low-noise microphone amplifier IC. The MAX9814 IC contains a low-noise amplifier, an output amplifier, a microphone bias-voltage generator, and automatic gain-control (AGC) internal circuitry. The overall gain of the microphone amplifier is selectable to 40dB, 50dB, or 60dB without compression. The MAX9814 incorporates compressor/limiter circuitry that limits the microphone output to a set voltage.

The MAX9814 EV kit operates over a 2.7V to 5.5V range. The EV kit also features low quiescent current, and shutdown control to minimize power consumption. The MAX9814 IC is available in a 14-pin TDFN (3mm x 3mm x 0.8mm) exposed paddle package.

Applications

  • Bluetooth® Headsets
  • Digital Still Cameras
  • Digital Video Cameras
  • Entertainment Systems (e.g. Karaoke)
  • High-Quality Portable Recorders
  • IP Phones/Telephone Conferencing
  • PDAs
  • Two-Way Communicators

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