Microphone Preamplifier With Variable Compression And Noise Gating

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 ampli 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. 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, an guaranteed for operation over the extended industrial temperature range of 4 to +85. As shown in Figure 1a, the SSM2165-1 1 has a rotation point of 25.7 dBu (40 mV , a VCA gain of 18 dB, and gives 7.7 dBu (320 mV) before limiting. As shown in Figur 1b, the SSM2165-2 has a rotation point of 17.8 dBu (100mV) By Analog Devices, Inc.
SSM2165 's PackagesSSM2165 's pdf datasheet

SSM2165 Pinout, Pinouts
SSM2165 pinout,Pin out
This is one package pinout of SSM2165,If you need more pinouts please download SSM2165's pdf datasheet.

SSM2165 Application circuits
SSM2165 circuits
This is one application circuit of SSM2165,If you need more circuits,please download SSM2165's pdf datasheet.

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