1–1

1 Introduction

The TLC320AD80 is an audio processing subsystem designed to meet the audio needs of a broad range

of set-top box applications. This device includes a high-performance stereo audio DAC, analog volume and

balance control, analog TV monaural decoder, de-emphasis filter, and an analog wide-band multiplexer.

The sigma-delta DAC performs data conversion with 85-dB performance. The architecture provides much

flexibility, giving the user the option to use all or a subset of the functional blocks.

There are two serial digital interfaces for digital audio data and four analog audio inputs. The analog output

of the device can be selected to be the output of the DAC, the output of the TV baseband filter, or

pass-through of one of the analog inputs.

audio port, and with the SPI

™ serial control interface. In addition, the digital audio interface supports

additional interface protocols.

1.1

Features

•

Highly Integrated Analog Audio Functions

•

Flexible Architecture Allows Variable Interconnects Between Functions

•

Sigma-Delta DAC With 16-Bit Resolution and 82-dB Performance Typical

•

Internal Monaural Decoder for TV Baseband Audio

•

Four Analog Audio Inputs: Two Stereo and Two Mono

•

Volume and Balance Control: 69 Step at 1 dB per Step With Mute

•

Selectable 50/15 ms De-Emphasis Analog Filter

•

Uncommitted Wide-Band Analog 2:1 Multiplexer

•

Multiplexed Analog Output can Select the Output of the DAC or Analog Data Pass-Through From

One of the Analog Audio Inputs

•

Formats)

•

SPI Bus-Compatible Serial Control Port

•

Sample Rates Supported in DAC: 8 kHz to 48 kHz

•

Digital Serial Ports Support 16-Bit or 18-Bit PCM Digital Audio Data Format

•

Analog Stereo Inputs can be Configured as Mono Inputs Through the Left Channel

•

Analog Output With 600-

Ω Load Drive and Short Circuit Protection

•

Internal Voltage Reference

•

TTL/CMOS Compatible

•

Single 5-V Power Supply, 64-Pin TQFP Package

SPI

™ is a trademark of Motorola Inc.