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 (SSM2018T) Differential Current Outputs (SSM2118T) Low External Parts Count Low Cost GENERAL DESCRIPTION
Trimless Voltage Controlled Amplifiers SSM2018T/SSM2118T* FUNCTIONAL BLOCK DIAGRAMS VC SSM-2018T G VG +IN –IN GAIN CORE –I G 1–G V1–G –I 1–G 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. 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.
Analog Devices
