Overview

The LC75372E is an electronic volume control that can implement volume, balance, fader, bass/treble, loudness, input switching, and input level control functions with a minimal number of external components.

Features

• Volume: Provides 81 positions, from 0 dB to –79 dB (in 1-dB steps) and –∞. A balance function can be implemented by controlling the left and right channels independently.

• Fader: This function can attenuate either the rear or the front outputs over 16 positions. (From 0 to –20 dB in 2-dB steps, from –20 to –25 dB in one 5-dB step, from –25 to –45 dB in 10-dB steps, –60 dB, and –∞.)

• Bass/treble: Forms an NF-type tone control circuit (LUX type) with the addition of external capacitors. The base and treble controls each have 15 positions.

• Loudness: The volume resistor ladders are tapped starting at the –20-dB position. A loudness function can be implemented by adding external RC circuits at these taps.

• The signal can be selected from one of three inputs for each of the left and right channels. The input signals can be amplified from 0 to +18 dB in 6-dB steps.

• On-chip buffer amplifiers for a minimum of external components.

• Minimal switching noise due to fabrication in a silicongate CMOS process.

• Built-in reference voltage generation circuit

• Serial data input: Supports CCB format communication with the system controller.