SSM2015 - Ultra-Low Noise Voltage Controlled Amplifier

Overview

The SSM2015 is a high-performance, ultra-low noise voltage controlled amplifier (VCA) designed for precision audio and instrumentation applications. This monolithic IC delivers exceptional signal integrity with its industry-leading noise performance and wide dynamic range. The SSM2015 is particularly suited for professional audio equipment, medical instrumentation, and other systems requiring precise signal amplification with minimal noise interference.

Built using Analog Devices' proprietary bipolar process technology, the SSM2015 combines low distortion characteristics with excellent temperature stability. The device features a logarithmic control response that is accurately trimmed during manufacturing, eliminating the need for user adjustments in most applications.

Key Features

• Ultra-Low Voltage Noise: 1.3nV/√Hz typical at 1kHz
• Wide Dynamic Range: >120dB typical
• Low Total Harmonic Distortion: <0.01% @ 1kHz
• Precision Logarithmic Control: 6mV/dB scaling
• Wide Gain Control Range: >100dB
• High Gain Bandwidth Product: 15MHz typical
• Excellent Power Supply Rejection: >80dB
• Flexible Power Supply Options: ±5V to ±18V operation
• Temperature Stable Performance: 50ppm/°C gain control drift

Applications

The SSM2015's exceptional performance characteristics make it ideal for a wide range of demanding applications:

Professional Audio Equipment

• Microphone preamplifiers
• Mixing consoles
• Digital recording systems
• Automated gain control circuits
• Noise gate systems

Medical Instrumentation

• Ultrasound systems
• Patient monitoring equipment
• EEG/EKG amplifiers
• Hearing aid electronics

Industrial and Test Equipment

• Precision measurement systems
• Vibration analysis equipment
• Automated test equipment
• Data acquisition systems

Electrical Characteristics

All specifications are given for ±15V supplies and TA = 25°C unless otherwise noted.

Absolute Maximum Ratings

• Supply Voltage: ±18V
• Input Voltage: ±VS
• Control Voltage: ±VS
• Output Short Circuit Duration: Continuous
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Typical Performance Characteristics

• Voltage Noise Density: 1.3nV/√Hz @ 1kHz
• Current Noise Density: 2pA/√Hz @ 1kHz
• Gain Range: -100dB to +20dB
• Gain Control Scaling: 6mV/dB ±0.5%
• THD+N: 0.01% @ 1kHz, 1V RMS output
• Slew Rate: 10V/μs
• Gain Bandwidth Product: 15MHz
• Power Supply Rejection Ratio: 80dB @ 100Hz
• Common Mode Rejection Ratio: 70dB @ 100Hz
• Quiescent Current: 8mA per supply

Package Information

The SSM2015 is available in multiple package options to suit different application requirements:

16-Lead PDIP (Plastic Dual In-Line Package)

• Package Code: N-16
• Dimensions: 19.3mm x 6.35mm x 4.57mm
• Lead Pitch: 2.54mm
• Thermal Resistance (θJA): 70°C/W

16-Lead SOIC (Small Outline Integrated Circuit)

• Package Code: R-16
• Dimensions: 10.3mm x 7.5mm x 2.35mm
• Lead Pitch: 1.27mm
• Thermal Resistance (θJA): 85°C/W

16-Lead CERDIP (Ceramic Dual In-Line Package)

• Package Code: D-16
• Dimensions: 19.3mm x 6.35mm x 4.57mm
• Lead Pitch: 2.54mm
• Thermal Resistance (θJA): 60°C/W

Design Considerations

When implementing the SSM2015 in your design, consider the following recommendations:

Power Supply Decoupling

For optimal performance, use 0.1μF ceramic capacitors placed as close as possible to the power supply pins, along with 10μF tantalum capacitors for bulk decoupling. This combination provides effective filtering across the frequency spectrum.

PCB Layout Guidelines

• Use a ground plane to minimize noise pickup
• Keep sensitive analog traces short and away from digital circuitry
• Route control voltage lines away from high-impedance input nodes
• Consider using guard rings around high-impedance inputs

Thermal Management

While the SSM2015 has modest power dissipation, proper thermal design becomes important in high-temperature environments or when operating at maximum supply voltages. For the SOIC package, consider using thermal vias to an underlying ground plane to improve heat dissipation.

Conclusion

The SSM2015 represents the state-of-the-art in voltage controlled amplifier technology, offering unparalleled noise performance and precision gain control. Its combination of ultra-low noise, wide dynamic range, and excellent linearity makes it the ideal choice for the most demanding audio and instrumentation applications. Whether used in professional recording equipment, medical devices, or precision measurement systems, the SSM2015 delivers consistent, high-quality performance across all operating conditions.

Designers can leverage the SSM2015's exceptional specifications to create systems with previously unattainable signal-to-noise ratios and dynamic range, while benefiting from the device's robust design and reliable operation. The availability of multiple package options further enhances its versatility, allowing for optimal implementation in diverse system architectures.