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SSM2165-1S

更新时间： 2024-01-01 07:22:47
品牌 Logo 应用领域
亚德诺 - ADI 消费电路商用集成电路音频放大器视频放大器光电二极管
页数 文件大小 规格书
10页 166K
描述
Microphone Preamplifier with Variable Compression and Noise Gating

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SSM2165-1S 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：SOIC
包装说明：SOIC-8针数：8
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.33.00.01风险等级：5.8
标称带宽：20 kHz商用集成电路类型：AUDIO PREAMPLIFIER
增益：18 dB谐波失真：0.5%
JESD-30 代码：R-PDSO-G8JESD-609代码：e3
长度：4.9 mm湿度敏感等级：1
信道数量：1功能数量：1
端子数量：8最高工作温度：85 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SOP8,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260电源：5 V
认证状态：Not Qualified座面最大高度：1.75 mm
子类别：Audio/Video Amplifiers最大压摆率：10 mA
最大供电电压 (Vsup)：5.5 V最小供电电压 (Vsup)：4.5 V
表面贴装：YES技术：BIPOLAR
温度等级：INDUSTRIAL端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：40
宽度：3.9 mmBase Number Matches：1

SSM2165-1S 数据手册

 浏览型号SSM2165-1S的Datasheet PDF文件第2页浏览型号SSM2165-1S的Datasheet PDF文件第3页浏览型号SSM2165-1S的Datasheet PDF文件第4页浏览型号SSM2165-1S的Datasheet PDF文件第5页浏览型号SSM2165-1S的Datasheet PDF文件第6页浏览型号SSM2165-1S的Datasheet PDF文件第7页 
Microphone Preamplifier with  
Variable Compression and Noise Gating  
a
SSM2165*  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
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  
Low Cost  
CONTROL  
DETECTOR  
APPLICATIONS  
SSM2165  
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. A  
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  
which 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  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1999  
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