GENERAL DESCRIPTION
The AD1974 is a high performance, single-chip codec that provides four analog-to-digital converters (ADCs) with differential inputs using the Analog Devices, Inc. patented multibit sigma-delta (Σ-Δ) architecture. An SPI port is included, allowing a microcontroller to adjust volume and many other parameters. The AD1974 operates from 3.3 V digital and analog supplies. The AD1974 is available in a single-ended output 48-lead LQFP.

FEATURES
    Phase-locked loop generated or direct master clock
    Low EMI design
    107 dB dynamic range and SNR
    −94 dB THD + N
    Single 3.3 V supply
    Tolerance for 5 V logic inputs
    Supports 24 bits and 8 kHz to 192 kHz sample rates
    Differential ADC input
    Log volume control with autoramp function
    SPI®-controllable for flexibility
    Software-controllable clickless mute
    Software power-down
    Right justified, left justified, I2S, and TDM modes
    Master and slave modes up to 16-channel input/output
    Available in a 48-lead LQFP

APPLICATIONS
    Automotive audio systems
    Home Theater Systems
    Set-top boxes
    Digital audio effects processors