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MAX9814ETD-T

更新时间： 2024-09-17 12:05:31

品牌	Logo	应用领域
美信 - MAXIM		放大器
页数	文件大小	规格书
14页	1064K
描述
Microphone Amplifier with AGC and Low-Noise Microphone Bias

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MAX9814ETD-T 数据手册

EVALUATION KIT AVAILABLE

MAX9814

Microphone Amplifier with AGC and

Low-Noise Microphone Bias

General Description

Features

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.

♦ 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/√Hz

♦ Low THD: 0.04% (typ)

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 thresh-

old. 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.

♦ Low-Power Shutdown Mode

♦ Internal Low-Noise Microphone Bias, 2V

♦ Available in the Space-Saving, 14-Pin TDFN (3mm

x 3mm) Package

♦ -40°C to +85°C Extended Temperature Range

Ordering Information

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.

PART

TEMP RANGE

PIN-PACKAGE

MAX9814ETD+T

-40°C to +85°C

14 TDFN-EP*

Applications

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Digital Still Cameras

Digital Video Cameras

PDAs

Two-Way Communicators

*EP = Exposed pad.

High-Quality Portable

Recorders

Pin Configurations appear at end of data sheet.

IP Phones/Telephone

Conferencing

Bluetooth Headsets

Entertainment Systems

(e.g., Karaoke)

Simplified Block Diagram

2.7V TO 5.5V

SHDN

MICBIAS

LOW-NOISE

REFERENCE

MAX9814

AGC

MICBIAS

OUT

GAIN

+8/+18/

+28dB

MICIN

MICOUT

LNA

+12dB

VGA

+20dB/0dB

GND

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

19-0764; Rev 2; 6/09

12 3 4 5 6 7...14

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