Add to Signal Chain Designer

SSM2166:  Complete Microphone Conditioner with Variable Compression & Noise Gating

Product Details

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 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 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 could 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.

The SSM2166 is an ideal companion product for audio codecs used in computer systems. 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
  • Guitar sustain effects generators
  • Computerized voice recognition
  • Surveillance systems
  • Karaoke and DJ mixers


  • Complete microphone conditioner in a
    14-lead package
  • Single 5 V operation
  • Adjustable noise gate threshold
  • Compression ratio set by external resistor
  • Automatic limiting feature—prevents ADC overload
  • Adjustable release time
  • Low noise and distortion
  • Power-down feature
  • 20 kHz bandwidth (±1 dB)

Functional Block Diagram for SSM2166


Title Content Type File Type
SSM2166: Microphone Preamplifier with Variable Compression & Noise Gating Data Sheet (Rev E, 10/2013) (pdf, 1651 kB) Data Sheets PDF
AN-938: Digital and Analog Measurement Units for Digital CMOS Microphone Preamplifier ASICs  (pdf, 75 kB) Application Notes PDF
AN-583: Using the SSM2167 Evaluation Board  (pdf, 132 kB)
This document explains how the evaluation board is set up and how to use it to evaluate the SSM-2167.
Application Notes PDF
Audio Processors, Amplifiers Deliver Complete HDTV Audio Subsystem
(EE Times, 10/1/2007)
Product Reviews HTML
ADI: Analog Essential To HDTV Experience
(Electronic Design, 10/1/2007)
Product Reviews HTML
Analog Devices in Advanced TV Overview HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

SSM2166 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
SSM2166SZ Status: Production 14 ld SOIC 14 Ind Tube, 56 $3.41 $3.13 Y  Material Info PCN Purchase Sample
SSM2166SZ-REEL Status: Production 14 ld SOIC 14 Ind Reel, 2500 - $3.13 Y  Material Info PCN Purchase
SSM2166SZ-REEL7 Status: Production 14 ld SOIC 14 Ind Reel, 1000 - $3.13 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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