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SSM2167-1RMZ-REEL Datasheet

  • SSM2167-1RMZ-REEL

  • Low Voltage Microphone Preamplifier with Variable Compressio...

  • 267.87KB

  • 12頁

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Low Voltage Microphone Preamplifier with
Variable Compression and Noise Gating
SSM2167
FEATURES
Complete microphone conditioner in a 10-lead package
Single 3 V operation
Low shutdown current < 2 渭A
Adjustable noise gate threshold
Adjustable compression ratio
Automatic limiting feature prevents ADC overload
Low noise and distortion: 0.2% THD + N
20 kHz bandwidth
PIN CONFIGURATION
GND
1
VCA
IN 2
SHUTDOWN
3
BUF
OUT 4
INPUT
5
10
V
DD
OUTPUT
COMPRESSION RATIO
02628-001
SSM2167
TOP VIEW
(Not to Scale)
9
8
7
6
GATE THRS
AVG CAP
Figure 1. 10-Lead MSOP (RM Suffix)
APPLICATIONS
Desktop, portable, or palmtop computers
Telephone conferencing
Communication headsets
Two-way communications
Surveillance systems
Karaoke and DJ mixers
DOWNWARD
EXPANSION
THRESHOLD
(NOISE GATE)
LIMITING
THRESHOLD
(ROTATION POINT)
LIMITING
REGION
OUTPUT (dB)
COMPRESSION
REGION
1
r
VCA GAIN
GENERAL DESCRIPTION
The SSM2167 is a complete and flexible solution for conditioning
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 鈭?0擄C to +85擄C.
DOWNWARD
EXPANSION
REGION
1
1
V
DE
INPUT (dB)
V
RP
Figure 2. General Input/Output Characteristics
Rev. C
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 漏2001鈥?007 Analog Devices, Inc. All rights reserved.
02628-002

SSM2167-1RMZ-REEL 產(chǎn)品屬性

  • 1

  • 集成電路 (IC)

  • 線性 - 音頻放大器

  • -

  • AB 類

  • 1-通道（單聲道）

  • -

  • 2.5 V ~ 5.5 V

  • 麥克風(fēng)，關(guān)機(jī)

  • 表面貼裝

  • 10-MSOP

  • 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）

  • Digi-Reel®

  • SSM2167Z-EVAL-ND - BOARD EVAL FOR SSM2167

  • SSM2167-1RMZ-REELDKR

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