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SSM2165-1SZ-REEL7

更新时间： 2024-11-02 14:44:59
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亚德诺 - ADI 放大器光电二极管商用集成电路
页数 文件大小 规格书
12页 170K
描述
1 CHANNEL, AUDIO PREAMPLIFIER, PDSO8, SOIC-8

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SSM2165-1SZ-REEL7 数据手册

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Microphone Preamplifier with  
Variable Compression and Noise Gating  
a
SSM2165*  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Complete Microphone Conditioner in an 8-Lead Package  
Single 5 V Operation  
Preset Noise Gate Threshold  
C2  
10␮F  
V+  
+
Compression Ratio Set by External Resistor  
Automatic Limiting Feature Prevents ADC Overload  
Adjustable Release Time  
Low Noise and Distortion  
20 kHz Bandwidth (؎1 dB)  
BUF  
VCA  
IN  
OUT  
V+  
+1  
C1  
0.1␮F  
R
2
R
A
A
2
AUDIO  
IN+  
V
VCA  
OUT  
BUFFER  
LEVEL  
CONTROL  
Low Cost  
DETECTOR  
SSM2165  
APPLICATIONS  
Microphone Preamplifier/Processor  
Computer Sound Cards  
AVG CAP  
+
R1  
25k⍀  
COMPRESSION  
RATIO SET  
C3  
22␮F  
GND  
Public Address/Paging Systems  
Communication Headsets  
Telephone Conferencing  
Guitar Sustain Effects Generator  
Computerized Voice Recognition  
Surveillance Systems  
a VCA gain of 8 dB and gives –9.8 dBu (250 mV) before limiting.  
Both have a noise gate threshold of –64 dBu (500 µV), below  
which downward expansion reduces the gain with a ratio of  
approximately 1:3. That is, a –3 dB reduction of output signal  
occurs with a –1 dB reduction of input signal. For applications  
requiring adjustable noise gate threshold, VCA gain up to 18 dB,  
and adjustable rotation point, please refer to the SSM2166.  
0
Karaoke and DJ Mixers  
GENERAL DESCRIPTION  
The SSM2165 is a complete and flexible solution for condition-  
ing 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 compres-  
sion ratio is set by a single resistor and can be varied from 1:1 to  
over 15:1 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 amplifi-  
cation 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 could add noise or  
impair accuracy of speech recognition algorithms. The flexibility  
of setting the compression ratio and the time constant of the  
level detector, coupled with two values of rotation point, make  
the SSM2165 easy to integrate in a wide variety of microphone  
conditioning applications.  
–10  
–20  
–30  
–40  
–50  
–60  
–80 –70  
–60  
–50  
–40  
–30  
–20  
–10  
INPUT – dBu  
Figure 1a. SSM2165-1 Compression and Gating Characteristics  
0
–10  
–20  
–30  
The SSM2165 is an ideal companion product for audio codecs  
used in computer systems, such as the AD1845 and AD1847.  
The device is available in 8-lead SOIC and P-DIP packages, and  
guaranteed for operation over the extended industrial temperature  
range of –40°C to +85°C. As shown in Figure 1a, the SSM2165-1  
has a rotation point of –25.7 dBu (40 mV)1, a VCA gain of 18 dB,  
and gives –7.7 dBu (320 mV) before limiting. As shown in Figure  
1b, the SSM2165-2 has a rotation point of –17.8 dBu (100 mV),  
–40  
–50  
–60  
–70  
–80  
–70  
–60  
–50  
–40  
–30  
–20 –10  
INPUT – dBu  
*Patents pending.  
Figure 1b. SSM2165-2 Compression and Gating Characteristics  
1All signals are in rms volts or dBu (0 dBu = 0.775 V rms).  
REV. B  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
may result from its use. No license is granted by implication or otherwise  
under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
www.analog.com  
© Analog Devices, Inc., 2002  
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SSM2165-1SZ-REEL7 替代型号

型号 品牌 替代类型 描述 数据表
SSM2165-2SZ ADI

完全替代

 1 CHANNEL, AUDIO PREAMPLIFIER, PDSO8, SOIC-8
SSM2165-2S-REEL ADI

完全替代

 暂无描述
SSM2165-2S ADI

完全替代

 Microphone Preamplifier with Variable Compression and Noise Gating

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SSM2165-2P ADI

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SSM2165-2S ADI

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SSM2165-2S-REEL ADI

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SSM2165-2S-REEL7 ADI

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SSM2165-2SZ ADI

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 		1 CHANNEL, AUDIO PREAMPLIFIER, PDSO8, SOIC-8
SSM2166 ADI

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 		Microphone Preamplifier with Variable Compression and Noise Gating
SSM2166_03 ADI

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 		Microphone Preamplifier with Variable Compression and Noise Gating
SSM2166_08 ADI

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 		Microphone Preamplifier with Variable Compression and Noise Gating
SSM2166_16 ADI

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 		Microphone Preamplifier
SSM2166P ADI

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 		Microphone Preamplifier with Variable Compression and Noise Gating

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