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Trimless Voltage Controlled Amplifiers

Courtesy/Thanks to: Analog Devices

Description: The SSM2018T and SSM2118T represent continuing evolution
of the Frey Operational Voltage Controlled Element
(OVCE) topology that permits flexibility in the design of high
performance volume control systems. Voltage (SSM2018T)
and differential current (SSM2118T) output versions are offered,
both laser-trimmed for gain core symmetry and offset. As
a result, the SSM2018T is the first professional audio quality
VCA to offer trimless operation. The SSM2118T is ideal for
low noise summing in large VCA based systems.
Due to careful gain core layout, the SSM2018T/SSM2118T
combine the low noise of Class AB topologies with the low distortion
of Class A circuits to offer an unprecedented level of
sonic transparency. Additional features include differential inputs,
a 140 dB gain range, and a high impedance control port.
The SSM2018T provides an internal current-to-voltage converter;
thus no external active components are required. The
SSM2118T has fully differential current outputs that permit
high noise-immunity summing of multiple channels.
Both devices are offered in 16-pin plastic DIP and SOIC packages
and guaranteed for operation over the extended industrial
temperature range of –40°C to +85°C.
*Protected by U.S. Patent Nos. 4,471,320 and 4,560,947.

117 dB Dynamic Range
0.006% Typical THD+N (@ 1 kHz, Unity Gain)
140 dB Gain Range
No External Trimming Required
Differential Inputs
Complementary Gain Outputs
Buffered Control Port
I–V Converter On-Chip (SSM2018T)
Differential Current Outputs (SSM2118T)
Low External Parts Count
Low Cost
Voltage Controlled Amplifiers


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   Datasheet for the SSM2118
Analog Devices
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