PRODUCT OVERVIEW

The AD1955 is a complete high performance single-chip stereo digital audio playback system. It is comprised of a multibit sigma-delta modulator, high performance digital interpolation filters, and continuoustime differential current output DAC section. Other features include an on-chip clickless stereo attenuator, mute capability, programmed through an SPI-compatible serial control port.

FEATURES

5V Power Supply Stereo Audio DAC System.

Accepts 16/18/20/24-Bit Data

Supports 24-Bits, 192kHz Sample Rate PCM Audio Data

Supports SACD bit-stream and External Digital Filter Interface

Accepts a Wide Range of PCM Sample Rates Including:

32kHz, 44.1kHz. 48kHz, 88.2kHz, 96kHz, and 192kHz

Multibit Sigma Delta Modulator with “Perfect Differential

Linearity Restoration” for Reduced Idle Tones and Noise Floor

Data Directed Scrambling DAC - Least Sensitive to Jitter

Supports SACD playback with “Bit Expansion” filter

Differential Current Output for Optimum Performance

8.64 mA p-p Output Current with +3dB headroom in SACD mode

120 dB SNR/DNR (not muted) at 48KHz Sample Rate (A-Weighted Stereo)

123 dB SNR/DNR (Mono)

-110 dB THD+N

110 dB Stopband Attenuation with +/-0.0002dB Passband Ripple

8 Times Oversampling Digital Filter

On-chip Clickless Volume Control

Supports SACD-Mute pattern detection

Supports 64fs/128fs DSD SACD with phase modulation

Internal Digital Filter pass-through for External Filter

Master clock: 256fs,384fs,512fs,768fs

Hardware and Software Controllable Clickless Mute

Serial (SPI) Control for: Serial Mode, Number of Bits,

Sample Rate, Volume, Mute, De-emphasis, Mono Mode

Digital De-emphasis for 32, 44.1, 48 KHz Sample Rates

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

28 Lead SSOP Plastic Package

APPLICATIONS

High-End DVD-Audio, SACD, CD, Home Theatre Systems, Automotive

Audio Systems, Sampling Musical Keyboards, Digital Mixing

Consoles, Digital Audio Effects Processors