SSM21671RMZ Analog Devices, SSM21671RMZ Datasheet

SSM21671RMZ

Manufacturer Part Number

SSM21671RMZ

Description

Manufacturer

Analog Devices

Datasheet

1.SSM21671RMZ.pdf (12 pages)

Specifications of SSM21671RMZ

Date_code

07+

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Data Sheet

FEATURES

Complete microphone conditioner in a 10-lead package

Single 3 V operation

Low shutdown current < 2 µA

Adjustable noise gate threshold

Adjustable compression ratio

Automatic limiting feature prevents ADC overload

Low noise and distortion: 0.2% THD + N

20 kHz bandwidth

APPLICATIONS

Desktop, portable, or palmtop computers

Telephone conferencing

Communication headsets

Two-way communications

Surveillance systems

Karaoke and DJ mixers

GENERAL DESCRIPTION

The

microphone inputs in personal electronics and computer audio

systems. It is also excellent for improving vocal clarity in com-

munications and public address systems. A low noise voltage

controlled amplifier (VCA) provides a gain that is dynamically

adjusted by a control loop to maintain a set compression charac-

teristic. The compression ratio is set by a single resistor and can

be varied from 1:1 to over 10:1 relative to the fixed rotation

point. Signals above the rotation point are limited to prevent

overload and to eliminate popping. A downward expander (noise

gate) prevents amplification of background noise or hum. This

results in optimized signal levels prior to digitization, thereby

eliminating the need for additional gain or attenuation in the

digital domain. The flexibility of setting the compression ratio

and the time constant of the level detector, coupled with two

values of rotation point, make the SSM2167 easy to integrate in

a wide variety of microphone conditioning applications.

The device is available in a 10-lead MSOP package, and is

guaranteed for operation over the extended industrial

temperature range of −40°C to +85°C.

Rev. G

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

SSM2167

is a complete and flexible solution for conditioning

Low Voltage Microphone Preamplifier with

Variable Compression and Noise Gating

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

DOWNWARD

SHUTDOWN

EXPANSION

REGION

(NOISE GATE)

DOWNWARD

THRESHOLD

BUF

EXPANSION

Figure 2. General Input/Output Characteristics

VCA

INPUT

GND

OUT

Figure 1. 10-Lead MSOP (RM Suffix)

PIN CONFIGURATION

(Not to Scale)

SSM2167

COMPRESSION

TOP VIEW

(ROTATION POINT)

REGION

INPUT (dB)

THRESHOLD

LIMITING

OUTPUT

COMPRESSION RATIO

GATE THRS

AVG CAP

SSM2167

LIMITING

REGION

www.analog.com

VCA GAIN

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