Overview
The SSM2166S, produced by Analog Devices Inc., is a highly versatile and integrated microphone preamplifier designed to condition microphone inputs in various audio systems. It is particularly suited for improving vocal clarity in computer audio systems, communications, and public address systems. The device features a low noise, voltage-controlled amplifier (VCA) that dynamically adjusts gain to maintain a set compression characteristic, making it ideal for voice-band applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | V+ | 4.5 | 5 | 5.5 | V |
| Input Signal Level | VIN | - | - | 1 | V rms |
| Output Signal Level | VO | - | - | 3 | V p-p |
| Gain Range | - | - | - | 80 | dB |
| Bandwidth | - | - | - | 30 | kHz |
| Input Impedance | - | - | 180 | kΩ | |
| Operating Temperature | TA | -40 | - | 85 | °C |
| Package Type | - | - | - | 14-Lead SOIC | - |
Key Features
- Variable Compression and Noise Gating: The SSM2166S features a voltage-controlled amplifier (VCA) with dynamically adjustable gain to maintain a set compression characteristic. The compression ratio can be varied from 1:1 to over 15:1, and the device includes a downward expander (noise gate) to prevent amplification of noise or hum.
- High Gain and Bandwidth: The device provides up to 60 dB of gain in the signal path with a bandwidth of approximately 30 kHz. Additional gain can be set by an input buffer from 0 dB to 20 dB, resulting in a total signal path gain of up to 80 dB.
- Power-Down Mode and Muting Capability: The SSM2166S includes a power-down feature that reduces the supply current to less than 100 µA, and it also has muting capability for controlling the output signal.
- User-Adjustable Parameters: Users can adjust the downward expansion threshold, the limiting threshold (rotation point), the input buffer fixed gain, and the internal VCA nominal gain at the rotation point.
Applications
- Computer Audio Systems: Ideal for conditioning microphone inputs in computer audio systems to improve vocal clarity and optimize signal levels prior to digitization.
- Communications and Public Address Systems: Enhances vocal clarity and reduces noise in communications and public address systems.
- Audio Codecs: Acts as a companion product for audio codecs used in various audio applications).
Q & A
- What is the primary function of the SSM2166S?
The SSM2166S is a microphone preamplifier with variable compression and noise gating, designed to condition microphone inputs in audio systems.
- What is the range of the compression ratio in the SSM2166S?
The compression ratio can be varied from 1:1 to over 15:1 relative to a user-defined rotation point.
- What is the maximum gain provided by the SSM2166S?
The device provides a total signal path gain of up to 80 dB, including the input buffer and VCA gains.
- What is the bandwidth of the SSM2166S?
The bandwidth is approximately 30 kHz.
- What is the input impedance of the SSM2166S?
The input impedance is approximately 180 kΩ.
- How does the power-down feature work?
The power-down feature reduces the supply current to less than 100 µA by connecting the power-down pin to the positive supply.
- What is the operating temperature range of the SSM2166S?
The operating temperature range is from -40°C to +85°C.
- In what package type is the SSM2166S available?
The SSM2166S is available in a 14-Lead SOIC package.
- Can the user adjust the gain and compression settings?
Yes, users can adjust the downward expansion threshold, the limiting threshold, the input buffer fixed gain, and the internal VCA nominal gain.
- What are some common applications of the SSM2166S?
Common applications include computer audio systems, communications, public address systems, and as a companion product for audio codecs.
