PRODUCT OVERVIEW

The AD1854 is a high performance, single-chip stereo, audio DAC delivering 113 dB Dynamic Range and 112 dB SNR (A-weighted—not muted) at 48 kHz sample rate. It is comprised of a multibit sigma-delta modulator with dither, continuous time analog filters and analog output drive circuitry. Other features include an on-chip stereo attenuator and mute, programmed through an SPI-compatible serial control port. The AD1854 is fully compatible with current DVD formats, including 96 kHz sample frequency and 24 bits. It is also backwards compatible by supporting 50 μs/15 μs digital de-emphasis intended for “redbook” 44.1 kHz sample frequency playback from compact discs.

FEATURES

5 V Stereo Audio DAC System

Accepts 16-/18-/20-/24-Bit Data

Supports 24 Bits and 96 kHz Sample Rate

Multibit Sigma-Delta Modulator with “Perfect Differential Linearity Restoration” for Reduced Idle Tones and Noise Floor

Data Directed Scrambling DAC—Least Sensitive to Jitter

Differential Output for Optimum Performance

113 dB Dynamic Range at 48 kHz Sample Rate (AD1854KRS)

112 dB Signal-to-Noise at 48 kHz Sample Rate (AD1854KRS)

–101 THD+N (AD1854KRS)

On-Chip Volume Control with 1024 Steps

Hardware and Software Controllable Clickless Mute

Zero Input Flag Outputs for Left and Right Channels

Digital De-Emphasis Processing

Supports 256  FS or 384  FS Master Mode Clock

Switchable Clock Doubler

Power-Down Mode Plus Soft Power-Down Mode

Flexible Serial Data Port with Right-Justified, Left Justified, and I2S-Compatible

28-Lead SSOP Plastic Package

APPLICATIONS

DVD, CD, Set-Top Boxes, Home Theater Systems, Automotive Audio Systems, Sampling Musical Keyboards, Digital Mixing Consoles, Digital Audio Effects Processors