High Performance Multibit - DAC a with SACD Playback AD1955 FEATURES FUNCTIONAL BLOCK DIAGRAM 5 V Power Supply Stereo Audio DAC System DSD Accepts 16-/18-/20-/24-Bit Data MASTER CONTROL BITSTREAM CLOCK INPUT DATA INPUT INPUT Supports 24-Bit, 192 kHz Sample Rate PCM Audio Data Supports SACD Bit Stream and External Digital Filter 3 4 Interface DIGITAL Accepts a Wide Range of PCM Sample Rates Including: AUTO-CLOCK SUPPLY SPI CONTROL DIVIDER 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, and 192 kHz 16-/20-/24-BIT 3/4 AUDIO DATA/ Multibit Sigma-Delta Modulator withPerfect Differen- MUX DSD FILTER EXTERNAL DIGITAL tial Linearity Restoratio for Reduced Idle Tones and FILTER INPUT Noise Floor Data Directed Scrambling DACLow Sensitivity to Jitter SERIAL DATA EXTERNAL RESET INTERFACE FILTER I/F Supports SACD Playback withBit Expansio Filter Differential Current Output for Optimum Performance MUTE 8.64 mA p-p Differential Output DIGITAL S/H 120 dB SNR/DNR (not muted) at 48 kHz Sample Rate FILTER ENGINE ANALOG (A-Weighted Stereo) SUPPLY 123 dB SNR/DNR (Mono) ZERO 110 dB THD + N NOISE-SHAPED MULTIBIT - FLAGS SCRAMBLING MODULATOR 110 dB Stop-Band Attenuation with 0.0002 dB Pass-Band Ripple 8 Oversampling Digital Filter VOLTAGE On-Chip Clickless Volume Control REFERENCE I-DAC I-DAC Supports SACD-Mute Pattern Detection Supports 64 f /128 f DSD SACD with Phase Mode S S Internal Digital Filter Pass-Through for External Filter L-CH R-CH Master Clock: 256 f , 512 f , 768 f S S S DIFFERENTIAL Hardware and Software Controllable Clickless Mute CURRENT OUTPUT Serial (SPI) Control for Serial Mode, Number of Bits, Sample Rate, Volume, Mute, De-Emphasis, Mono Mode Digital De-Emphasis for 32 kHz, 44.1 kHz, and 48 kHz PRODUCT OVERVIEW Sample Rates The AD1955 is a complete, high performance, single-chip, stereo Flexible Serial Data Port with Right-Justified, Left- digital audio playback system. It is comprised of a multibit sigma- 2 Justified, I S, and DSP Modes delta modulator, high performance digital interpolation filters, 28-Lead SSOP Plastic Package and continuous-time differential current output DACs. Other features include an on-chip clickless stereo attenuator and mute APPLICATIONS capability, programmed through an SPI compatible serial control High End DVD Audio port. The AD1955 is fully compatible with all known DVD audio SACD formats including 192 kHz as well as 96 kHz sample frequencies CD and 24 bits. It is also backward compatible by supporting 50 s/ Home Theater Systems 15 s digital de-emphasis intended for redbook compact discs, Automotive Audio Systems as well as de-emphasis at 32 kHz and 48 kHz sample rates. Sampling Musical Keyboards Digital Mixing Consoles The AD1955 has a very flexible serial data input port that Digital Audio Effects Processors allows for glueless interconnection to a variety of ADCs, DSPs, SACD decoders, external digital filters, AES/EBU receivers, and (continued on page 12) REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties that Tel: 781/329-4700 www.analog.com may result from its use. No license is granted by implication or otherwise Fax: 781/326-8703 Analog Devices, Inc., 2002 under any patent or patent rights of Analog Devices.AD1955SPECIFICATIONS TEST CONDITIONS (Unless otherwise noted.) Analog Supply Voltages (AV ) 5 V DD Digital Supply Voltages (DV ) 5 V DD Reference Current (I ) . 0.960 mA REF Ambient Temperature . 25C Input Clock . 12.288 MHz Input Signal . 984.375 Hz, 0 dB Full Scale Input Sample Rate 48 kHz Measurement Bandwidth 20 Hz to 20 kHz Word Width . 24 Bits Load Capacitance 100 pF Load Impedance 47 k Input Voltage HI . 2.4 V Input Voltage LO 0.8 V ANALOG PERFORMANCE (See figures. I = 0.960 mA, V = 2.80 V.) REF BIAS Parameter Min Typ Max Unit Resolution 24 Bits SIGNAL-TO-NOISE RATIO (20 Hz to 20 kHz)* Differential Output (A-Weighted, RMS) (Stereo) 120 114 dB Differential Output (A-Weighted, RMS) (Mono) 123 dB Single-Ended (A-Weighted, RMS) (Stereo) 119 dB DYNAMIC RANGE (20 Hz to 20 kHz, 60 dB Input)* Differential Output (A-Weighted, RMS) (Stereo) 120 114 dB Differential Output (A-Weighted, RMS) (Mono) 123 dB Single-Ended (A-Weighted, RMS) (Stereo) 119 dB Total Harmonic Distortion + Noise (Stereo) at 0 dBFS 110 102.5 dB ANALOG OUTPUTS Differential Output Range (Full Scale) 8.64 mA p-p Output Capacitance at Each Output Pin 100 pF Output Bias Current, Each Output 3.24 mA Out-of-Band Energy (0.5 f to 100 kHz) 90 dB S Reference Voltage 2.245 2.39 2.505 V DC ACCURACY Gain Error 6% Interchannel Gain Mismatch 0.01 0.26 dB Gain Drift 25 ppm/C Interchannel Crosstalk (EIAJ Method) 125 dB Interchannel Phase Deviation 0.1 Degrees Mute Attenuation 100 dB De-Emphasis Gain Error 0.1 dB *Measured with Audio Precision System Two Cascade in RMS Mode. Averaging Mode will show approximately 2 dB better performance. Performance of right and left channels are identical (exclusive of the Interchannel Gain Mismatch and Interchannel Phase Deviation specifications). Specifications subject to change without notice. 2 REV. 0