SSM2166:  Complete Microphone Conditioner in a 14-Lead Package with Variable Compression & Noise Gating

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 ...More

SSM2166:  Complete Microphone Conditioner in a 14-Lead Package with Variable Compression & Noise Gating

Product Description

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, such as the AD1845. 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.

Applications

  • 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

    • Data Sheet, Rev. C, 5/08

    Features

    • 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)

    Diagrams

    SSM2166 Diagram
    Functional Block Diagram for SSM2166

    Specifications

    Product Description Mic Conditioner w/ Noise Gate

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    *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.
    **Sample availability may be better than production availability. Please enter samples iinto your cart to check sample availability.

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