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)