Trimless

Voltage Controlled Amplifier

Data Sheet

SSM2018

Rev. C

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FEATURES

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

Low external parts count

Low cost

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The SSM2018 represents the continuing evolution of the Frey

Operational Voltage Controlled Element (OVCE) topology that

permits flexibility in the design of high performance volume

control systems. The SSM2018 is laser trimmed for gain core

symmetry and offset. As a result, the SSM2018 is the first

professional audio quality VCA to offer trimless operation.

Due to careful gain core layout, the SSM2018 combines 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 (−100 dB

to +40 dB) gain range, and a high impedance control port. The

SSM2018 provides an internal current-to-voltage converter.

Thus, no external active components are required.

This device is offered in 16-lead, plastic DIP package and

guaranteed for operation over the extended industrial

temperature range of −40°C to +85°C.

SSM2018

G

GAIN

CORE

1–G

+IN

–IN