SSM2166SZ - Microphone Preamplifier w/ Variable Compression | ADI
部品番号: SSM2166SZ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $7.5 | $7.50 |
| 10 | $6.78 | $67.80 |
| 100 | $5.9 | $590.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.88 | $4,880.00 |
SSM2166SZ 概要
A microphone preamplifier with variable compression and noise gating is a specialized audio signal-chain block used to capture speech or instrument signals with wide dynamic range and deliver them at a controlled level to downstream ADCs, codecs, mixers, or transmitters. Within the system hierarchy, the SSM2166SZ sits in the analog front-end path between the electret or condenser microphone capsule and the next stage (codec, DSP, mixer, or modulator), and belongs to the broader category of audio amplifiers → amplifier ICs → integrated circuits. By combining three traditionally discrete blocks (mic preamp, AGC/compressor, noise gate) into one IC, it eliminates the need for an external detector op-amp, envelope rectifier, and VCA, reducing board area and design complexity.
Key specifications of the SSM2166SZ include a low input-referred noise voltage that supports high signal-to-noise ratio microphone capture, an adjustable compression ratio from approximately 1:1 to over 10:1, a variable rotation point, a user-settable noise-gate threshold, an internal voltage reference for biasing, and an analog supply range suited to typical 5V audio subsystems. According to the Analog Devices SSM2166 datasheet, the device operates over the extended industrial temperature range of -40C to +85C and is supplied in a 14-lead SOIC package rated for surface-mount assembly.
The compression loop is built around a low-noise VCA whose gain is dynamically adjusted by an envelope detector tracking the output level, producing a closed-loop AGC characteristic that prevents downstream stages from clipping on loud sounds while keeping quiet passages above the noise floor. Designers set the rotation point (the level at which compression begins), the compression ratio (how aggressively loud signals are attenuated), and the gate threshold (the level below which output is muted) using external resistor dividers, giving the SSM2166SZ rare flexibility in a single package.
Typical applications include computer audio microphone inputs, voice-over-IP headsets, communications and public-address systems, intercoms, two-way radio audio conditioning, and consumer voice-recognition front-ends where consistent speech level is critical to recognition accuracy. It also serves broadcast and conferencing equipment that requires uniform levels across multiple talkers.
When designing with this part, pay attention to the gain-setting resistor values around the preamp and VCA stages, place the decoupling capacitor as close as possible to the supply pin, and follow Analog Devices' reference layout guidance to preserve the device's signal-to-noise ratio. Choice of rotation point and compression ratio directly affects intelligibility and naturalness of the captured voice.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, with cross-references verified against the latest DigiKey and Mouser listings as of 2026-10-10.
ドロップイン代替品: SSM2166SZ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: SSM2166SZ （同一形状・フットプリント） — 相違点: Package, Product Type.
クイック比較ツール — 並列比較する代替部品を選択:
SSM2166S
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SSM2166SZ-REEL
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SSM2166S-REEL7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SSM2167
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX9814ETD+T
✅ ドロップイン✓ 在庫あり
$0.75 / 個
データシートを見る →SSM2166SZ 最大定格＆電気的特性
| Product Type | Microphone preamplifier with variable compression and noise gating |
| Channel Count | 1 (Mono) |
| Output Class | Class AB |
| 動作温度範囲 | -40 C to +85 C |
| パッケージ | 14-SOIC (NSOIC, 0.154 inch / 3.90 mm width) |
| 実装タイプ | Surface Mount |
| Compression Ratio Range | Adjustable (approx. 1:1 to >10:1 via external resistors) |
| Rotation Point | User-adjustable via external resistor |
| Noise Gate Threshold | User-adjustable via external resistor |
| RoHS ステータス | Compliant |
| Lead-Free | Yes |
SSM2166SZ ピン構成
| ピン 1 | V+ — Positive supply voltage |
| ピン 2 | GND — Ground |
| ピン 3 | MIC IN — Microphone preamp input |
| ピン 4 | PREAMP OUT — Microphone preamp output |
| ピン 5 | VCA IN — Voltage-controlled amplifier input |
| ピン 6 | VCA OUT — Voltage-controlled amplifier output |
| ピン 7 | VREF — Internal voltage reference |
| ピン 8 | DET IN — Envelope detector input (RMS/peak) |
| ピン 9 | ROT — Rotation point resistor (compression threshold) |
| ピン 10 | COMP — Compression ratio setting resistor |
| ピン 11 | GATE — Noise gate threshold setting resistor |
| ピン 12 | REC — Rectifier output / timing capacitor |
| ピン 13 | VB — Virtual ground / bias |
| ピン 14 | OUT — Buffered main signal output |
主な用途
SSM2166SZ の用途: 6 件s: Computer Audio Microphone Input, VoIP and Telephony Headsets, Communications and Public Address Systems, Intercom and Two-Way Radio Audio Conditioning, Voice Recognition and Speech Capture Front-End, Consumer Audio Recording and Broadcasting.
Computer Audio Microphone Input
Why SSM2166SZ fits: The SSM2166SZ integrates a low-noise microphone preamp, compression loop, and adjustable noise gate in a single 14-SOIC IC, making it ideal for USB headsets, laptop microphones, and conferencing peripherals where board area is constrained. How it is used and performance: The microphone capsule is AC-coupled to the SSM2166SZ preamp input; the compression rotation point is set around the codec's nominal mic level (e.g., -10 dBV) for natural speech capture, while the gate threshold is set just above ambient room noise. Designers tune the compression ratio (typically 3:1 to 6:1) so loud talkers do not clip the codec's ADC while quiet talkers remain well above the noise floor, yielding consistently intelligible speech at the host codec.
おすすめ
VoIP and Telephony Headsets
Why SSM2166SZ fits: Voice-over-IP and telephony headsets require consistent speech levels across different talkers and environments, exactly the use case the SSM2166SZ compression and noise-gate blocks address. Its industrial -40C to +85C range supports outdoor and in-vehicle headsets. How it is used and performance: Placed between the boom microphone element and the headset's USB or Bluetooth audio codec, the SSM2166SZ establishes a stable output level envelope. The compression rotation point is set near the codec's 0 dBFS target, and the noise gate is set above the headset's self-noise floor (typically 10 to 20 mV), so silence between utterances is gated out. This preserves dynamic range in the codec and improves voice activity detection for VoIP bandwidth saving.
おすすめ
Communications and Public Address Systems
Why SSM2166SZ fits: Public address (PA) paging microphones, intercoms, and radio communications gear need to deliver intelligible speech at a consistent level regardless of how loudly or softly the operator speaks, plus suppress background hum between announcements. How it is used and performance: A paging microphone connects through the SSM2166SZ before reaching the PA amplifier or radio modulator; the compressor flattens level variations and the noise gate silences line hum between pages. Designers typically set a higher compression ratio (8:1 or above) for PA use to maximize intelligibility over loudspeakers, while adjusting the gate threshold above the venue's ambient noise floor to prevent pumping or chattering during quiet periods.
おすすめ
Intercom and Two-Way Radio Audio Conditioning
Why SSM2166SZ fits: Intercom panels and two-way radios with hands-free operation require automatic level control so the receiving end does not have to ride the gain, while rejecting environmental noise between transmissions. How it is used and performance: The microphone feeds the SSM2166SZ preamp, whose compressor holds the line level constant as the talker moves closer to or further from the microphone. Noise gating ensures that vehicle noise, HVAC rumble, and crowd noise are gated out when nobody is speaking. The result is a much cleaner audio signal presented to the modulator or line driver, reducing listener fatigue and improving reliability of downstream voice-operated switches.
おすすめ
Voice Recognition and Speech Capture Front-End
Why SSM2166SZ fits: Speech recognition engines (local keyword spotters, dictation, or cloud ASR front-ends) depend on consistent input level and high SNR to maintain recognition accuracy across different talkers and acoustic environments. How it is used and performance: The microphone capsule's output is fed to the SSM2166SZ whose compressor keeps the speech envelope within the recognition engine's preferred dynamic range, and whose noise gate silences ambient sound between commands. Combined with the part's low input-referred noise, this front-end significantly improves wake-word detection reliability and reduces false triggers in smart-speaker and voice-control appliances.
おすすめ
Consumer Audio Recording and Broadcasting
Why SSM2166SZ fits: Consumer-grade audio recorders, podcast microphones, and small broadcasting mixers benefit from automatic level control so creators do not have to ride the gain manually during recording sessions. How it is used and performance: In a portable recorder or podcast interface, the SSM2166SZ sits between the microphone input stage and the recorder's ADC. The rotation point is tuned to the ADC's headroom, the compression ratio to a gentle 2:1 or 3:1 to preserve natural dynamics, and the gate threshold above the room's idle floor. The output is a level-managed mic signal that downstream equalization, limiting, and noise reduction can polish further without first having to normalize wildly varying talker levels.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: SSM2166SZ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | SSM2166S | SSM2166SZ-REEL | SSM2166S-REEL7 |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 14-SOIC (NSOIC) | 14-SOIC (NSOIC) - same | 14-SOIC (NSOIC) - same | 14-SOIC (NSOIC) - same |
| Channel Count | 1 (Mono) | 1 (Mono) | 1 (Mono) | 1 (Mono) |
| Output Class | Class AB (analog output) | Class AB | Class AB | Class AB |
| Adjustable Compression | Yes (ratio & rotation) | Yes | Yes | Yes |
| Noise Gate | Yes (adjustable threshold) | Yes | Yes | Yes |
| Operating Temperature Range | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| 1ku List Price (USD) | $4.88 | similar tier | $4.88 | similar tier |
主な差別化要因
- Three blocks integrated into one 14-SOIC mic conditioner （vs Discrete mic preamp + envelope detector + VCA)
- User-adjustable compression ratio, rotation point, and gate threshold （vs Fixed AGC behavior in simple AGC chips)
- Extended industrial -40C to +85C operating range （vs Commercial-grade mic preamps (0C to +70C))
設計ノート
The SSM2166SZ compression ratio, rotation point, and gate threshold are set by external resistors; do not leave any of these pins floating or the part will operate at undefined dynamics. Always wire the COMP, ROT, and GATE pins to specific resistor networks referenced to the SSM2166SZ's VREF/ground per the ADI datasheet's typical application circuit. Forgetting a timing capacitor on REC also disables the envelope detector, which can stop compression entirely.
Place the supply decoupling capacitor (typically 10 uF plus 0.1 uF) as close as possible to the SSM2166SZ supply pin to preserve the low input-referred noise floor. Route the microphone input traces as short and direct as possible, guard them with a ground plane on the PCB underside, and keep them away from switching regulators or digital lines to avoid RF pickup that the SSM2166SZ could rectify as audible noise. Use a star-ground topology so the analog return current of the mic preamp does not share a path with motor or digital return currents.
According to community reports on ez.analog.com, the SSM2166 family can pick up AM-modulated RF interference from nearby VHF transmitters; if the design is for an automotive or industrial environment, add an RF feedthrough or pi-filter at the microphone input and on the supply pin. Choosing a quiet microphone capsule and twisting/shielding the microphone cable also helps avoid this susceptibility. Validate immunity in the target enclosure before committing to production.
コンプライアンス情報
RoHS and REACH compliance per Analog Devices product information. The SSM2166SZ is not AEC-Q100 qualified - it is intended for consumer, communications, and industrial audio. Conflict-minerals compliance per ADI's published CMRT declarations.
