GENERAL DESCRIPTION

The AD1939 is a high performance, single-chip codec that provides four analog-to-digital converters (ADCs) with differential input, and eight digital-to-analog converters (DACs) with differential output 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 AD1939 operates from 3.3 V digital and analog supplies. The AD1939 is available in a 64-lead (differential output) LQFP package.

FEATURES

  PLL generated or direct master clock

  Low EMI design

  112 dB DAC/107 dB ADC 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

  Differential DAC output

  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

  64-lead LQFP package

  Qualified for automotive applications

APPLICATIONS

  Automotive audio systems

  Home Theater Systems

  Set-top boxes

  Digital audio effects processors