AD1955 High Performance, Multibit Sigma-Delta DAC with SACD Playback

The AD1955 is a complete, high performance, single chip stereo digital audio playback system comprised of a multi-bit sigma-delta modulator, digital interpolation filters and a continuous-time differential current output DAC section. Unique to this audio DAC is the separate SACD (super audio CD) bit-stream and external digital filter interface, which allows users maximum system flexibility. The AD1955 supports 24-bits, 192 kHz sample rate and is designed for use in high-end SACD players, DVD-audio, home theater, automotive audio, digital mixing consoles, digital audio effect processors and sampling musical keyboards.

Applications

High-End DVD-Audio, SACD, CD, Home Theatre Systems
Automotive Audio Systems, Sampling Musical Keyboards, Digital
Mixing Consoles, Digital Audio Effects Processors

Features and Benefits

Supports 24-Bits, up to 192 kHz Sample Rate PCM Audio Data
Supports SACD bit-stream and External Digital Filter Interface
Multibit Sigma Delta Modulator with "Perfect Differential Linearity Restoration" for Reduced Idle Tones and Noise Floor
Data Directed Scrambling DAC - Least Sensitive to Jitter
8.64 mA p-p Differential Output Current for Optimum Performance, with +3 dB headroom in SACD mode
5 V Power Supply Stereo Audio DAC System

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
Flexible Serial Data Port with Right-Justified, Left-Justified, I2S-Compatible and DSP Serial Port
28 Lead SSOP Plastic Package

Audio & Video Products

Audio D/A Converters

Software & Systems Requirements

Data Sheets

Document	note
AD1955: High Performance Multibit Sigma-Delta DAC with SACD Playback Data Sheet (Rev. 0)	PDF 897 kB

Application Notes

Document	note
AN-1006: Using the EVAL-ADUSB2EBZ (Rev. A)	PDF 349 kB
AN-349: Keys to Longer Life for CMOS	PDF 89 kB
AN-211: The Alexander Current-Feedback Audio Power Amplifier	PDF 1154 kB