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