Overview

The LV1041M is a Dolby Prologic Surround signal-processing IC that implements in a single chip the functions of the Sanyo LV1016 and LA2786 ICs and a master volume control for the center and surround channels. This IC allows both systems of Dolby Prologic surround and digital surround to be formed into a single IC.

Features

• Implements a Prologic surround decoder in a single chip.

• Wide dynamic range

• All modes can be controlled from control data transmitted serially over four lines: CLOCK, DATA, ENABLE, and ENABLE2. This function is compatible with the LV1016 and the LA2786.

Functions

• Adaptive matrix

• Center mode control (normal, phantom, wide)

• 4/3 channel logic control

• Auto-balance (on/off)

• Prologic off mode (bypass and full bypass)

• Center trim (0 to –31 dB in 1-dB steps)

• On-chip memory: (8K SRAM)

• Variable delay time: 15, 20, 25, 30, 40, or 50 ms (15, 20, 25, or 30 ms for Dolby Prologic surround)

• New A/D and D/A converter circuits adopted

• On-chip Dolby B noise reduction

• On-chip input and output filters

• Built-in VDD circuit

• Surround trim (0 to –31 dB in 1-dB steps)

• Input and output muting functions

• Master volume control for the center and surround channels (0 to –44 dB in –2-dB steps, –44 to –76 dB in –4-dB steps, and muted)