Analog Devices Inc. SSM2166S-REEL

The SSM2166, produced by Analog Devices Inc., is a complete microphone conditioner integrated circuit designed for conditioning microphone inputs in various audio systems. It is particularly useful for improving vocal clarity in communications, public address systems, and computer audio applications. The device integrates a low-noise, voltage-controlled amplifier (VCA) with variable compression and noise gating capabilities, ensuring optimized signal levels prior to digitization.

The SSM2166 operates on a single 5 V supply and can accept input signals up to 1 V rms, producing output signal levels greater than 1 V rms into loads greater than 5 kΩ. It 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.

• Variable Compression and Noise Gating: The SSM2166 features a voltage-controlled amplifier (VCA) with a dynamically adjusted gain to maintain a set compression characteristic. The compression ratio can be varied from 1:1 to over 15:1 relative to a user-defined rotation point.
• Input Buffer and Gain Control: The input buffer can be configured for front-end gains of 0 dB to 20 dB, and the total signal path gain can be up to 80 dB.
• Downward Expander (Noise Gate): Prevents the amplification of noise or hum in the absence of an input signal, ensuring clean audio output.
• Power-Down Feature: The supply current can be reduced to less than 100 µA in power-down mode.
• Single Supply Operation: Operates on a single 5 V supply and accepts input signals up to 1 V rms.
• Industrial Temperature Range: Guaranteed for operation over the extended industrial temperature range of −40°C to +85°C.

• Computer Audio Systems: Ideal companion product for audio codecs used in computer systems to improve microphone input conditioning.
• Public Address Systems: Enhances vocal clarity and overall audio quality in public address systems.
• Communications Systems: Suitable for voice-band applications, including telecommunication and voice recognition systems.
• Audio Equipment: Can be used in various audio equipment where high-quality microphone preamplification and noise reduction are required).

1. What is the primary function of the SSM2166?

   The SSM2166 is a complete microphone conditioner with variable compression and noise gating, designed to improve microphone input conditioning in various audio systems).

2. What is the operating voltage range of the SSM2166?

   The SSM2166 operates on a single supply voltage range of 4.5 V to 5.5 V).

3. What is the maximum gain provided by the SSM2166?

   The total signal path gain can be up to 80 dB, including the input buffer gain and the VCA gain).

4. How does the noise gating feature work in the SSM2166?

   The downward expander (noise gate) prevents the amplification of noise or hum in the absence of an input signal, ensuring clean audio output).

5. What is the temperature range for the SSM2166?

   The SSM2166 is guaranteed for operation over the extended industrial temperature range of −40°C to +85°C).

6. What package type is the SSM2166 available in?

   The SSM2166 is available in a 14-lead SOIC package).

7. Can the compression ratio of the SSM2166 be adjusted?

   Yes, the compression ratio can be varied from 1:1 to over 15:1 relative to a user-defined rotation point).

8. How does the power-down feature of the SSM2166 work?

   The supply current of the SSM2166 can be reduced to less than 100 µA by applying an active signal to the power-down pin).

9. What are some common applications of the SSM2166?

   The SSM2166 is commonly used in computer audio systems, public address systems, and communications systems where high-quality microphone preamplification is required).

10. Is the SSM2166 RoHS compliant?

    Yes, the SSM2166 is RoHS compliant).