Overview
The SSM2167-1RM-REEL, produced by Analog Devices Inc., is a complete microphone signal conditioning system integrated into a single circuit. It is designed primarily for voice-band applications and is highly versatile for use in personal electronics and computer audio systems. The device features a low noise voltage-controlled amplifier (VCA) that dynamically adjusts gain to maintain a set compression characteristic, making it excellent for improving vocal clarity in communications and public address systems.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage (VSY) | 2.5 V to 5.5 V |
| Supply Current (ISY) | 2.3 mA to 5 mA |
| Quiescent Current | 2.3 mA |
| Shutdown Supply Current | 2 µA to 8 µA |
| Operating Temperature Range | −40°C to +85°C |
| Storage Temperature Range | −65°C to +150°C |
| Junction Temperature | 150°C |
| Lead Temperature (Soldering) | 260°C |
| Compression Ratio | 1:1 to 10:1 |
| Rotation Point | 63 mV rms |
| Noise Gate Range | −40 dBV (maximum threshold) |
| Gain Bandwidth Product | 1 MHz |
| Output Voltage Range | 0.4% THD + N, 700 mV rms |
| Package | 10-Lead MSOP |
Key Features
- Variable Compression: The compression ratio can be varied from 1:1 to over 10:1 using a single resistor, allowing for dynamic gain adjustment.
- Noise Gating: A downward expander (noise gate) prevents the amplification of background noise or hum, optimizing signal levels before digitization.
- Low Noise VCA: A low noise voltage-controlled amplifier ensures high-quality audio output with minimal distortion.
- Flexible Rotation Point: The rotation point can be adjusted, allowing for different compression characteristics based on the application needs.
- Power Supply Rejection Ratio (PSRR): High PSRR of 45 dB ensures minimal impact from power supply noise.
- Compact Package: Available in a 10-lead MSOP package, suitable for a variety of applications where space is limited.
Applications
- Desktop, Portable, or Palmtop Computers: Ideal for integrating into computer audio systems.
- Telephone Conferencing and Communication Headsets: Enhances vocal clarity and reduces background noise.
- Two-way Communications and Surveillance Systems: Provides clear and reliable audio signals.
- Karaoke and DJ Mixers: Optimizes audio quality for professional and hobbyist use.
- Public Address Systems: Improves vocal clarity and reduces noise in public address applications.
Q & A
- What is the primary function of the SSM2167?
The SSM2167 is a complete microphone signal conditioning system designed to condition microphone inputs in personal electronics and computer audio systems.
- What is the supply voltage range for the SSM2167?
The supply voltage range is from 2.5 V to 5.5 V.
- How can the compression ratio be adjusted?
The compression ratio can be varied from 1:1 to over 10:1 using a single resistor.
- What is the purpose of the noise gate in the SSM2167?
The noise gate prevents the amplification of background noise or hum, optimizing signal levels before digitization.
- What is the operating temperature range of the SSM2167?
The operating temperature range is from −40°C to +85°C.
- What package types are available for the SSM2167?
The SSM2167 is available in a 10-lead MSOP package.
- How does the SSM2167 improve vocal clarity?
The SSM2167 improves vocal clarity through its low noise VCA and adjustable compression ratio, which help maintain optimal signal levels and reduce background noise.
- What are some common applications of the SSM2167?
Common applications include desktop, portable, or palmtop computers, telephone conferencing, communication headsets, two-way communications, surveillance systems, karaoke and DJ mixers, and public address systems.
- What is the maximum junction temperature for the SSM2167?
The maximum junction temperature is 150°C.
- How does the power supply rejection ratio (PSRR) affect the performance of the SSM2167?
A high PSRR of 45 dB ensures that power supply noise has a minimal impact on the device's performance.
