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SSM2167:  Low Voltage Microphone Preamplifier with Variable Compression & Noise Gating

Product Details


The SSM2167 is a complete and flexible solution for conditioning microphone inputs in personal electronics and computer audio systems. It is also excellent for improving vocal clarity in com-munications 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 10:1 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 amplification of background 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. The flexibility of setting the compression ratio and the time constant of the level detector, coupled with two values of rotation point, make the SSM2167 easy to integrate in a wide variety of microphone conditioning applications.

The device is available in a 10-lead MSOP package, and is guaranteed for operation over the extended industrial temperature range of −40°C to +85°C.

Applications

  • Desktop, portable, or palmtop computers
  • Telephone conferencing
  • Communication headsets
  • Two-way communications
  • Surveillance systems
  • Karaoke and DJ mixers
  • FEATURES and BENEFITS

    • Complete microphone conditioner in a 10-lead package
    • Single 3 V operation
    • Low shutdown current < 2 μA
    • Adjustable noise gate threshold
    • Adjustable compression ratio
    • Automatic limiting feature prevents ADC overload
    • Low noise and distortion: 0.2% THD + N
    • 20 kHz bandwidth

    SSM2167 Pin Configuration Diagram

    Documentation

    Title Content Type File Type
    SSM2167: Low Voltage Microphone Preamplifier with Variable Compression and Noise Gating Data Sheet (Rev G, 09/2011) (pdf, 269 kB) Data Sheets PDF
    AN-583: Using the SSM2167 Evaluation Board  (pdf, 124 kB) Application Notes 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
    CN-0262: Low Noise Analog MEMS Microphone and Preamp with Compression and Noise Gating  (pdf) Circuit Note 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
    Amplifier pricing where you want it,  (pdf, 1037 kB)
    ... performance where you need it.
    Overview PDF
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    SSM2167 Transfer Characteristic Tool
    An online tool to compute and plot the transfer characteristic from RCOMP and RGATE.
    Design Calculators HTML

    Evaluation Kits & Symbols & Footprints

    Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

    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.

    Product Recommendations & Reference Designs

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    Price, packaging, availability

    SSM2167 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    SSM2167-1RMZ-R7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $1.20 Y  Material Info PCN Purchase Sample
    SSM2167-1RMZ-REEL Status: Production 10 ld MSOP 10 Ind Reel, 3000 - $1.20 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.

    SSM2167 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    SSM2167Z-EVAL Status: Production Evaluation Board $55.66 Yes -

    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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