GENERAL DESCRIPTION

The AD1954 is a complete 26-bit single-chip 3-channel digital audio playback system with built-in DSP functionality for speaker equalization, dual-band compression/limiting, delay compensation, and image enhancement. These algorithms can be used to compensate for real-world limitations of speakers, amplifi ers, and listening environments, resulting in a dramatic improvement of perceived audio quality.

FEATURES

5 V 3-Channel Audio DAC System

Accepts Sample Rates up to 48 kHz

7 Biquad Filter Sections per Channel

Dual Dynamic Processor with Arbitrary Input/Output Curve

and Adjustable Time Constants

0 ms to 6 ms Variable Delay/Channel for Speaker Alignment

Stereo Spreading Algorithm for Phat Stereo™ Effect

Program RAM Allows Complete New Program Download

via SPI Port

Parameter RAM Allows Complete Control of More Than

200 Parameters via SPI Port

SPI Port Features Safe-Upload Mode for Transparent Filter

Updates

2 Control Registers Allow Complete Control of Modes and

Memory Transfers

Differential Output for Optimum Performance

112 dB Signal-to-Noise (Not Muted) at 48 kHz Sample Rate

(A-Weighted Stereo)

70 dB Stop-Band Attenuation

On-Chip Clickless Volume Control

Hardware and Software Controllable Clickless Mute

Digital De-emphasis Processing for 32 kHz, 44.1 kHz, and

48 kHz Sample Rates

Flexible Serial Data Port with Right-Justifi ed, Left-Justifi ed,

I2S Compatible, and DSP Serial Port Modes

Auxiliary Digital Input

Graphical Custom Programming Tools

44-Lead MQFP or 48-Lead LQFP Plastic Package

APPLICATIONS

2.0/2.1 Channel Audio Systems (Two Main Channels plus Subwoofer)

Multimedia Audio

Automotive Sound Systems

Minicomponent Stereo

Home Theater Systems (AC-3 Postprocessor)

Musical Instruments

In-Seat Sound Systems (Aircraft, Motor Coaches)