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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)