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SSM2166SZ-REEL1

更新时间： 2024-11-02 12:27:23
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亚德诺 - ADI 放大器
页数 文件大小 规格书
20页 549K
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Microphone Preamplifier with Variable Compression and Noise Gating

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SSM2166SZ-REEL1 数据手册

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Microphone Preamplifier with  
Variable Compression and Noise Gating  
SSM2166  
SSM2166 can be programmed with a fixed gain of up to 20 dB;  
this gain is in addition to the variable gain in other compression  
FEATURES  
Complete microphone conditioner in a 14-lead SOIC package  
Single 5 V operation  
Adjustable noise gate threshold  
Compression ratio set by external resistor  
Automatic limiting feature—prevents ADC overload  
Adjustable release time  
settings. The input buffer can also be configured for front-end  
gains of 0 dB to 20 dB. A downward expander (noise gate) prevents  
amplification of 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 that may  
add noise or impair accuracy of speech recognition algorithms.  
The compression ratio and time constants are set externally. A  
high degree of flexibility is provided by the VCA gain, rotation  
point, and noise gate adjustment pins.  
Low noise and distortion  
Power-down feature  
20 kHz bandwidth ( 1 dBꢀ  
APPLICATIONS  
The SSM2166 is an ideal companion product for audio codecs  
used in computer systems, such as the AD1845. The SSM2166 is  
available in a 14-lead SOIC package and is guaranteed for  
operation over the extended industrial temperature range of  
−40°C to +85°C.  
Microphone preamplifiers/processors  
Computer sound cards  
Public address/paging systems  
Communication headsets  
Telephone conferencing  
10  
Guitar sustain effects generators  
Computerized voice recognition  
Surveillance systems  
COMP RATIO = 10:1  
COMP RATIO = 2:1  
0
–10  
–20  
Karaoke and DJ mixers  
GENERAL DESCRIPTION  
COMP RATIO = 1:1  
The SSM2166 integrates a complete and flexible solution for  
conditioning microphone inputs in computer audio systems. It  
is also excellent for improving vocal clarity in communications  
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 characteristic. The  
compression ratio is set by a single resistor and can be varied  
from 1:1 to over 15:1 relative to a user-defined rotation point;  
signals above the rotation point are limited to prevent overload  
and to eliminate popping. In the 1:1 compression setting, the  
–30  
–40  
–50  
–60  
–70  
–60  
–50  
–40  
–30  
–20  
–10  
0
INPUT (dBu)  
Figure 1. Compression and Gating Characteristics with 10 dB of Fixed Gain (The  
Gain Adjust Pin Can Be Used to Vary This Fixed Gain Amount)  
FUNCTIONAL BLOCK DIAGRAM AND TYPICAL SPEECH APPLICATION  
V+  
R1  
10kΩ  
10µF  
+
10µF (OPTIONAL)  
+
V+  
VCA  
VCA  
R
BUF OUT  
BUFFER  
IN  
GAIN  
ADJUST  
5
3
4
14  
2
1kΩ  
2.3kΩ  
–IN  
6
7
OUTPUT  
0.1µF  
13  
9
VCA  
1kΩ  
AUDIO  
+IN  
NOISE GATE  
SET  
500kΩ  
17kΩ  
R2  
10kΩ  
LEVEL  
DETECTOR  
CONTROL  
11  
+
1µF  
SSM2166  
ROTATION  
SET  
12  
1
8
10  
POWER DOWN  
GND  
AVG CAP  
COMP RATIO SET  
+
22µF  
25kΩ  
Figure 2.  
Rev. D  
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 registeredtrademarks arethe 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 ©1996–2008 Analog Devices, Inc. All rights reserved.  
 
 
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