Overview
The SSM2167-1RMZ-REEL, produced by Analog Devices Inc., is a complete microphone signal conditioning system integrated into a single circuit. This device is designed primarily for voice-band applications and is highly versatile for conditioning microphone inputs in personal electronics, computer audio systems, and various communication devices. It 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 |
| 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 for 10 seconds |
| VCA Dynamic Gain Range | 40 dB |
| VCA Fixed Gain | 18 dB |
| Compression Ratio | 1:1 to over 10:1 |
| Rotation Point | 63 mV rms |
| Noise Gate Range Maximum Threshold | −40 dBV |
| Power Supply Rejection Ratio (PSRR) | 45 dB (VSY = 2.5 V to 6 V) |
| Shutdown Supply Current | Typically less than 2 µA |
Key Features
- Low Noise VCA: Provides dynamically adjusted gain to maintain a set compression characteristic.
- Variable Compression Ratio: Adjustable from 1:1 to over 10:1 using a single external resistor.
- Noise Gate: Prevents amplification of background noise or hum, optimizing signal levels before digitization.
- Low Distortion: Ensures high-quality audio output with minimal distortion.
- Active Low Digital Power-Down: Reduces device supply current to typically less than 2 µA when in shutdown mode.
- Flexible Integration: Easy to integrate into various microphone conditioning applications due to adjustable compression ratio and level detector time constant.
Applications
- Desktop, portable, or palmtop computers
- Telephone conferencing and communication headsets
- Two-way communications and surveillance systems
- Karaoke and DJ mixers
- Public address systems
Q & A
- What is the primary function of the SSM2167?
The SSM2167 is a complete microphone signal conditioning system designed for voice-band applications, conditioning microphone inputs in personal electronics and computer audio systems.
- What is the range of the supply voltage for the SSM2167?
The supply voltage range is from 2.5 V to 5.5 V.
- How is the compression ratio adjusted in the SSM2167?
The compression ratio is adjusted using a single external resistor and can be varied from 1:1 to over 10:1.
- What is the purpose of the noise gate in the SSM2167?
The noise gate prevents 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.
- How does the SSM2167 handle power-down?
The device features an active low digital power-down mode that reduces supply current to typically less than 2 µA.
- What package types are available for the SSM2167?
The SSM2167 is available in a 10-lead MSOP package.
- What are some common applications of the SSM2167?
Common applications include desktop and portable computers, telephone conferencing, communication headsets, two-way communications, surveillance systems, and public address systems.
- How does the SSM2167 improve vocal clarity?
The SSM2167 improves vocal clarity by dynamically adjusting the gain to maintain a set compression characteristic, preventing overload and eliminating popping, and by using a noise gate to prevent amplification of background noise.
- What is the typical shutdown supply current of the SSM2167?
The typical shutdown supply current is less than 2 µA.
