Datasheet > MAX9814

MAX9814

更新时间： 2024-11-26 14:57:51

品牌	Logo	应用领域
亚德诺 - ADI		放大器
页数	文件大小	规格书
13页	1207K
描述
具有AGC和低噪声麦克风偏置电路的麦克风放大器

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中文翻译

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MAX9814 数据手册

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Microphone Ampliﬁer with AGC and

Low-Noise Microphone Bias

MAX9814

General Description

Features

● Automatic Gain Control (AGC)

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.

● 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 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.

● 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 appears at end of data sheet.

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.

Simpliﬁed Block Diagram

Applications

● Digital Still Cameras

2.7V TO 5.5V

● Digital Video Cameras

● PDAs

SHDN

MAX9814

MICBIAS

MICIN

LOW-NOISE

REFERENCE

AGC

● Bluetooth Headsets

MICBIAS

OUT

GAIN

+8/+18/

+28dB

LNA

+12dB

VGA

MICOUT

● Entertainment Systems (e.g., Karaoke)

● Two-Way Communicators

● High-Quality Portable Recorders

● IP Phones/Telephone Conferencing

+20dB/0dB

GND

19-0764; Rev 4; 2/20

12 3 4 5 6 7...13

中文翻译

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与MAX9814相关器件

型号	品牌	获取价格	描述	数据表
MAX9814_09	MAXIM	获取价格	Microphone Amplifier with AGC and Low-Noise Microphone Bias
MAX9814EBC+T	MAXIM	获取价格	Microphone Amplifier with AGC and Low-Noise Microphone Bias
MAX9814ETD	MAXIM	获取价格	Microphone Amplifier with AGC and Low-Noise Microphone Bias
MAX9814ETD/V+T	MAXIM	获取价格	Audio Amplifier
MAX9814ETD+	MAXIM	获取价格	暂无描述
MAX9814ETD+T	MAXIM	获取价格	Microphone Amplifier with AGC and Low-Noise Microphone Bias
MAX9814ETD-T	MAXIM	获取价格	Microphone Amplifier with AGC and Low-Noise Microphone Bias
MAX981CPA	MAXIM	获取价格	Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators
MAX981CSA	MAXIM	获取价格	Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators
MAX981CUA	MAXIM	获取价格	Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators

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