SSM2167-1RM-REEL

Overview

The SSM2167-1RMZ-REEL is a low voltage microphone preamplifier with variable compression and noise gating. It operates on a single 3 V supply with shutdown current under 2 µA. The device features an adjustable noise gate threshold, adjustable compression ratio, and automatic limiting to prevent ADC overload. Audio specifications include 0.2% THD+N and a 20 kHz bandwidth. It is housed in a 10-lead MSOP package.

Feature Summary

• Integrates complete microphone conditioning including amplification, limiting, variable compression, and noise gating within a single integrated circuit.
• Features a low noise voltage controlled amplifier (VCA) that dynamically adjusts gain via a control loop to maintain set compression characteristics.
• Includes a downward expander (noise gate) to prevent the amplification of background noise or hum prior to digitization.

Applications

• Desktop, portable, or palmtop computers
• Telephone conferencing systems
• Communication headsets

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging and RoHS compliance status. Confirm that the component matches the required temperature range and package dimensions for your design. Cross-reference the part number with the latest datasheet revision to validate all electrical parameters before finalizing procurement.

Selection Notes

Select this component for voice-band applications requiring optimized signal levels prior to digitization. The fixed rotation point and user-adjustable compression ratio allow flexibility for various microphone conditioning needs. Ensure the external resistor values align with the desired compression and noise gate thresholds as defined in the technical specifications.

Part Context

This component belongs to the Analog Devices SSM2167 series of audio interface integrated circuits. It is designed specifically for personal electronics and computer audio systems where space and power consumption are critical constraints. The device provides a complete solution for improving vocal clarity in communications and public address environments.

Replacement Considerations

Consult the manufacturer's ordering guide for direct replacements such as the SSM2167-1RMZ-R7 variant. Verify pin compatibility and electrical specifications when considering alternative models from other manufacturers.

FAQ

How is the compression ratio configured?

The compression ratio is set by connecting a single resistor between Pin 8 and VDD. Values range from 1:1 (shorted) to over 10:1.

What is the function of the SHUTDOWN pin?

Applying an active low input to Pin 3 reduces the supply current to typically less than 2 µA, placing the device in a low-power state.