SSM2167-1RMZ-REEL

SSM2167-1 is a low voltage microphone preamplifier with variable compression and noise gating. It 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. It is used in applications such as desktop, portable, or palmtop computers, telephone conferencing, communication headsets, two-way communications, surveillance systems, karaoke and DJ mixers.

• Single 3V operation
• Adjustable noise gate threshold
• Adjustable compression ratio
• Automatic limiting feature prevents ADC overload
• Voltage noise density is 20nV/√Hz typical at (10:1 compression, TA = 25°C)
• Total harmonic distortion + noise is 0.2% typical at (VIN = 100mV rms, TA = 25°C)
• Supply voltage range from 2.5V to 5.5V
• Supply current is 2.3mA typical at (VS = 3V, f = 1KHz, TA = 25°C)
• Power supply rejection ratio is 45dB typical at (VSY = 2.5V to 6V)
• Operating temperature is -40°C to +85°C, package style is 10-lead MSOP

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