The SSM2166 is a microphone preamplifier with variable compression and noise gating features. The product features include: single 14-lead package, single +5 V operation, adjustable noise gate threshold, external resistor set compression ratio, automatic limiting feature, adjustable release time, low noise and distortion, power-down feature, 20 kHz bandwidth (±1 dB), and low cost.
The SSM2166 integrates a complete microphone conditioning solution for computer audio, communication, and public‑address systems. It provides a low‑noise voltage‑controlled amplifier (VCA) with adjustable compression ratio (1:1 to >15:1) and a programmable noise‑gate threshold, allowing dynamic gain control and limiting to prevent overload.
Key features include single‑supply (+5 V) operation, up to 60 dB VCA gain, 30 MHz gain‑bandwidth product, low noise density (17 nV/√Hz), and a power‑down mode that reduces supply current to <100 µA. The device is supplied in a 14‑lead SOIC package and operates over –40 °C to +85 °C.
| Supply Voltage Range | 4.5 V – 5.5 V |
|---|---|
| Supply Current (Normal Operation) | 7.5 mA – 10 mA |
| Noise Density | 17 nV/√Hz |
| Input Impedance | 180 kΩ |
The device operates from 4.5 V to 5.5 V.
The VCA can provide up to 60 dB of gain.
The input buffer has an input impedance of about 180 kΩ.