SSM2166S

SSM2166S is a single‑channel microphone preamplifier IC with automatic gain control (AGC) and dynamic-range compression/limiting. It’s part of the SSM family from Analog Devices (formerly Silicon Systems) and is designed to keep mic signals at a stable level with minimal noise.
What it does:
- Amplifies a microphone signal and automatically adjusts gain using an integrated detector and control circuit.
- Provides soft compression/limiting to prevent clipping and improve consistency in varying vocal levels.
Key points:
- External components set gain, AGC thresholds, and timing (attack/release).
- Low-noise input suitable for microphone front‑ends.
- Typically powered from a single supply (with options for other supplies as per datasheet) and capable of driving subsequent analog stages.
Typical uses:
- Voice capture for recorders, conferencing gear, mixers, and PA systems.
- Front‑end for telephony, wireless mic receivers, and other audio front‑ends needing automatic level control.
High‑level usage:
- Connect mic to input, configure gain and AGC through RC networks per datasheet, supply V+, and route the output to the next stage.

SSM2166S is a dual-mic preamp with integrated dynamic-range control. Key features:
- Low-noise, high-gain microphone preamplifier with differential inputs
- Built-in dynamics processor: compressor/limiter and expander/gate
- Envelope detector for level-dependent processing (often RMS-based)
- Adjustable parameters: gain, compressor ratio, threshold, attack and release, soft knee
- Suitable for mic/line inputs; supports balanced or unbalanced sources
- Wide dynamic range with low distortion
- Compact packaging (typical 8-pin package) for integration into compact audio gear
- Applications: voice recorders, conferencing/telecom, handheld devices, mixers, and other compact audio equipment
Note: exact pinouts, supply range, and control interfaces may vary by revision/package; consult the specific datasheet for precise electrical specs and wiring.

SSM2166S comes in an 8-pin Small Outline Integrated Circuit (SOIC-8) package.

Pin count: 8 pins (DIP-8/SO-8).
Function: An Analog Devices device that is a low-noise microphone preamplifier with integrated peak detector and compressor/limiter for automatic gain control of the mic signal.

- Manufacturer: Analog Devices, Inc. (ADI).
- About the company: A multinational American semiconductor company that designs, manufactures, and markets analog, mixed-signal, and digital signal processing integrated circuits (and related components).

- Two-channel microphone preamplifier with integrated compressor/limiter
- Voice/telecom devices (phones, VoIP, conferencing)
- Headsets and handheld/portable recorders
- Consumer portable electronics needing level control (dictation devices, camcorders)
- Public address and broadcast systems
- Automotive hands-free/voice-control audio
- Hearing aids or assistive listening equipment (where applicable)