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

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 ...More

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

Product Description

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 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 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 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 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

    • 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

    Diagrams

    SSM2167 Diagram
    Functional Block Diagram for SSM2167

    Specifications

    Supply Current (max) 5mA
    Micophone Driver Mono

    SSM2319 - Filterless, High Efficiency, Mono 3 W Class-D Audio Amplifier

    SSM2335 - Filterless, High Efficiency, Mono 3 W Class-D Audio Amplifier

    SSM2604 - Low Power Audio Codec

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    Part# Output Power (W) Speaker Driver Headphone Driver Micophone Driver Product Description Price* (1000-4999)
    AD8541 - - - - Rail-Rail Input/Output, Low Power, Single/Supply, CMOS Amplifier $0.27
    AD8542 - - - - Dual, Rail-Rail Input/Output, Low Power, Single/Supply, CMOS Amplifier $0.38
    AD8544 - - - - Quad, Rail-Rail Input/Output, Low Power, Single/Supply, CMOS Amplifier $0.54
    ADAU1513 23 - - - - $3.15
    ADAU1590 15.5 - - - - $3.49
    ADAU1592 18 - - - - $3.66
    SSM2167 - - - Mono Microphone Driver withe Noise Gate $1.20
    SSM2211 1.5 Mono - - Mono Speaker Driver $0.45
    SSM2250 1.5 Mono Stereo - Mono Speaker and Stereo Headphone Driver $1.00
    SSM2301 1.4 - - - - $0.45
    SSM2302 2 - - - - $0.92
    SSM2304 2 - - - - $0.81
    SSM2305 2.8 - - - - $0.60
    SSM2306 2 - - - - $0.99
    SSM2311 3 - - - - $0.73
    SSM2315 3 Mono - - - $0.82
    SSM2317 3 - - - - $0.91
    SSM2319 3 - - - - $0.90
    SSM2335 3 - - - - $0.63

    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    ** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

    Pricing, Packaging & Availability

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    Temperature Range
    This is the acceptable operating range of the device. The various ranges specified are as follows:
    • Commercial: 0 to +70 degrees Celsius
    • Military : -55 to +125 degrees Celsius
    • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
    • Automotive: -40 to +125 degrees Celsius
    Price
    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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    Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

    *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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