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Multi-functional  VCA blocks (Fader/Panner)
  AS3365 - Multi-functional VCA blocks (Fader/Panner).
AS3365 contains three VCA blocks, which are intended for use in musical synthesizer applications (VCA blocks, faders, panners, multiplexers, ring modulators etc.). VCA1 and VCA2 implement function of controlling amplification. A direct signal CVMix1 is supplied to the VCA1 control, an inverted CVMix2 signal is supplied to the VCA2 control. Using two amplifiers VCA1 and VCA2 together, you can implement the function of stereo panning of the input signal. Additional control input Vcntrl controls attenuation of output current - thus realizing function of double multiplication input signal on two control signals. VCA3 block has additional feature – possibility of control/mixing of two input signals.
Such solution gives vast opportunities in designing new synth solutions.



- three VCA blocks with a wide range of functions
  containing three 4-quadrant multipliers and 3 2-quadrant multipliers
- two linear controls for each VCA
- simple signal mixing
- can combine high impedance outputs
- provides high attenuation (-100 dB)
- simplifies faders and panners design
- low current consumption of 3 mA typ at ±12V


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