Overview

The LC75394NE is an electronic volume control system providing control over volume, balance, 5-band equalizer, and input switching based on serial inputs.

Features

• Built-in buffer amplifiers reduce the number of external parts necessary.

• Silicon gate CMOS reduces switching noise.

• Serial data input

—Supports CCB* format communication with the system controller.

• A built-in reference voltage circuit divides the supply voltage (VDD) in half.

Functions

• Volume control:

The chip provides 25 levels of volume attenuation: in 2- dB steps between 0 dB and –20 dB, 3-dB steps between –20 dB and –32 dB, 4-dB steps between –32 dB and –52 dB, 4.5-dB steps between –52 dB and –70 dB, and –∞. Independent control over left and right channels provides balance control.

• Equalizer:

The chip provides control in 2-dB steps over the range between +10 dB and –10 dB. Four of the five bands have peaking equalization; the remaining one, shelving

equalization.

• Selector:

The left and right channels each offer a choice of four inputs. An external constant determines the amplification for the input signal.