Additional preview pages of the C1851BCU datasheet.
C1851BCU Product details
Features
Stereo demodulation, SAP (Sub Audio Program) demodulation, dbx noise reduction decoding, I2C bus interface, input selector (2 channels), surround processor (1 phase), volume and tone control circuits incorporated on a single chip.
Mode switching, volume and tone control, and separation adjustment through the I2C bus.
Power supply: 8 V to 10 V.
On-chip input attenuator for simple interface with intermediate frequency processing IC (I2C bus control).