Overview
The SSM2167-1RMZ-R2 from Analog Devices Inc. is a complete and flexible solution for conditioning microphone inputs in various applications, including personal electronics, computer audio systems, communications, and public address systems. This integrated circuit provides a low noise voltage-controlled amplifier (VCA) with dynamic gain adjustment and features such as variable compression and noise gating. It is designed to improve vocal clarity and optimize signal levels prior to digitization, eliminating the need for additional gain or attenuation in the digital domain.
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 |
| Dynamic Gain Range | 40 dB |
| Fixed Gain | 18 dB |
| Compression Ratio | 1:1 to 10:1 |
| Noise Gate Range Maximum Threshold | −40 dBV |
| Output Impedance | < 145 Ω |
| Bandwidth | Over 1 MHz at gains up to 30 dB |
| Package | 10-Lead MSOP |
Key Features
- Low noise voltage-controlled amplifier (VCA) with dynamic gain adjustment.
- Variable compression ratio from 1:1 to over 10:1.
- Noise gating to prevent amplification of background noise or hum.
- Full-wave rectifier and true rms level detector circuit.
- Wide bandwidth over 1 MHz at gains up to 30 dB.
- Low power supply voltage range of 2.5 V to 5.5 V.
- High power supply rejection ratio (PSRR) of 45 dB.
- Shutdown current as low as 2 μA.
Applications
- Personal electronics such as smartphones, tablets, and laptops.
- Computer audio systems.
- Communications and public address systems.
- Voice-band applications requiring improved vocal clarity.
- Any system needing optimized microphone signal conditioning prior to digitization.
Q & A
- What is the primary function of the SSM2167-1RMZ-R2?
The SSM2167-1RMZ-R2 is a complete microphone signal conditioning system, providing a low noise VCA with dynamic gain adjustment, variable compression, and noise gating.
- What is the supply voltage range for the SSM2167-1RMZ-R2?
The supply voltage range is from 2.5 V to 5.5 V.
- What is the operating temperature range of the SSM2167-1RMZ-R2?
The operating temperature range is from −40°C to +85°C.
- What is the dynamic gain range of the VCA in the SSM2167-1RMZ-R2?
The dynamic gain range is 40 dB.
- How does the noise gating feature work in the SSM2167-1RMZ-R2?
The noise gating feature prevents the amplification of background noise or hum by implementing a downward expander.
- What is the bandwidth of the SSM2167-1RMZ-R2 at high gains?
The bandwidth is over 1 MHz at gains up to 30 dB.
- What package type is the SSM2167-1RMZ-R2 available in?
The device is available in a 10-Lead MSOP package.
- How does the compression ratio in the SSM2167-1RMZ-R2 get set?
The compression ratio is set by a single resistor and can be varied from 1:1 to over 10:1 relative to the fixed rotation point.
- What is the purpose of the level detector circuit in the SSM2167-1RMZ-R2?
The level detector circuit, which includes a full-wave rectifier and a true rms level detector, helps in optimizing signal levels and response times to signal dynamics.
- What is the shutdown current of the SSM2167-1RMZ-R2?
The shutdown current is as low as 2 μA.
- What are some common applications of the SSM2167-1RMZ-R2?
Common applications include personal electronics, computer audio systems, communications, and public address systems.
