Overview

The LC75347E is a 6-channel 97-step electronic volume control system IC that provides a 2-channel input selector, bass and treble tone controls, external output ports, and a zero-cross volume switching function.

Functions

• Volume: 0 to –95 dB (in 1 dB steps) and –∞, for a total of 97 positions. Each of the six input channels can be controlled independently.

• Bass and treble: Each band can be controlled over a ±12 dB range in 2 dB steps. The bass control provides peaking characteristics and the treble control provides shelving characteristics.

• Selector: 2-channel input selector

• Zero cross: Provides independent zero-cross detection for each of the 6 channels and a timer overflow detection circuit.

• External muting: Mute in/mute out function using zero cross detection and dedicated pins.

• External output ports: Provides 4 n-channel transistor open-drain outputs.

Features

• Built-in buffer amplifiers reduce the number of external components to a minimum.

• Fabricated in a silicon-gate CMOS process for minimal noise generation from internal switches

• Built-in analog ground reference voltage generator circuit

• All settings are controlled by serial data transmitted over a CCB interface.