CA3084 is the tone and volume controller
Here is the description
which is controlled by I C bus.
This IC can apply the broad application because of
low noise and distortion.
20 P 4 B ( SP ) FEATURE
TONE(Bass/Treble) control and 1dB step
volume control are enabled .
Low noise and low distortion .
VNO= 4.5Vrms, CTHD=0.1% max
Controlling by serial data in conformity to the
I C bus format .
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