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Part: AD1954YST
Category:
Description: SigmaDSP Digital Audio Processor
Company: Analog Devices
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PRELIMINARY TECHNICAL DATA
a
SigmaDSPTM Three-Channel, 24-Bit Signal Processing DAC Preliminary Technical Data AD1954
FEATURES 5 V 3-Channel Audio DAC System Accepts Sample Rates up to 48 kHz Seven Biquad Filter Sections per Channel Dual Dynamic Processor with Arbitrary Input/Output Curve and Adjustable Time Constants 0 ms to 6 ms Variable Delay/Channel for Speaker Alignment Stereo Spreading Algorithm for "Phat StereoTM" effect Program RAM Allows Complete New Program Download via SPI Port Parameter RAM Allows Complete Control of More Than 200 Parameters via SPI Port SPI Port Features "Safe-Upload" Mode for Transparent Filter Updates Two Control Registers Allow Complete Control of Modes and Memory Transfers Differential Output for Optimum Performance 112 dB Signal-to-Noise (Not Muted) at 48 kHz Sample Rate (A-Weighted Stereo) 75 dB Stopband Attenuation On-Chip Clickless Volume Control Hardware and Software Controllable Clickless Mute Digital De-emphasis Processing for 32 kHz, 44.1 kHz, 48 kHz Sample Rates Flexible Serial Data Port with Right-Justified, Left-Justified, I2S-Compatible, and DSP Serial Port Modes 44-Lead MQFP or 48-Lead LQFP Plastic Package APPLICATIONS 2.0/2.1 Channel 1 Audio Systems (Two Main Channels Plus Subwoofer) Multimedia Audio Automotive Sound Systems Mini Component Stereo Home Theater Systems (AC-3 Post Processor) Musical Instruments In-Seat Sound Systems (Aircraft, Motor Coaches)
PRODUCT OVERVIEW
The AD1954 is a complete 26-bit single-chip 3-channel digital audio playback system with built-in DSP functionality for speaker equalization, dual-band compression limiting, delay compensation, and image enhancement. These algorithms can be used to compensate for real-world limitations of speakers, amplifiers, and listening environments, resulting in a dramatic improvement of perceived audio quality. The signal processing used in the AD1954 is comparable to that found in high-end studio equipment. Most of the processing is done in full 48-bit double-precision mode, resulting in very good low-level signal performance and the absence of limit cycles or idle tones. The compressor/limiter uses a sophisticated two-band algorithm often found in high-end broadcast compressors. (continued on page 9)
FUNCTIONAL BLOCK DIAGRAM
SERIAL DATA OUTPUT 3 3 3 3 MASTER CLOCK OUTPUT AUDIO DATA MUX 26 22 DSP CORE DATA FORMAT: 3.23 (SINGLE PRECISION) 3.45 (DOUBLE PRECISION) DAC L
AD1954
SERIAL DATA INPUTS
DAC R MCLK GENERATOR (256/384/512 fS)
ANALOG OUTPUTS
MASTER CLOCK INPUTS
MCLK MUX
DAC SW
AUX SERIAL DATA INPUT SPI DATA OUTPUT SPI INPUT 3 DIGITAL OUT SERIAL CONTROL INTERFACE RAM ROM
SigmaDSP and Phat Stereo are trademarks of Analog Devices Inc.
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Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002
PRELIMINARY TECHNICAL DATA AD1954
TABLE OF CONTENTS FEATURES/APPLICATIONS/PRODUCT OVERVIEW . . 1 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . . 7 TYPICAL PERFORMANCE CHARACTERICS . . . . . . . . 8 OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 S I G N A L - P R O C E S S I N G . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Signal Processing Overview . . . . . . . . . . . . . . . . . . . . . . . 12 Numeric Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 High-pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Biquad Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 V o l u m e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Stereo Image Expander . . . . . . . . . . . . . . . . . . . . . . . . . . 14 D e l a y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Main Compressor/Limiter . . . . . . . . . . . . . . . . . . . . . . . . 15 Subwoofer Compressor/Limiter . . . . . . . . . . . . . . . . . . . . 18 De-emphasis Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Using the Sub Re-Injection Paths for Systems with No S u b w o o f e r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Interpolation Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 SPI PORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 O v e r v i e w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 SPI Address Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Volume Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Parameter RAM Contents . . . . . . . . . . . . . . . . . . . . . . . . 22 Options for Parameter Updates . . . . . . . . . . . . . . . . . . . . 25 Soft Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 S a f e l o a d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Summary of RAM modes . . . . . . . . . . . . . . . . . . . . . . . 26 SPI READ/WRITE DATA FORMATS . . . . . . . . . . . . . . . Parameter RAM Read/Write Format (Single Address) . . Parameter RAM Read/Write Format (Burst Mode) . . . . . Program Ram Read/Write Format (Single Address) . . . . Program Ram Read/Write Format (Burst Mode) . . . . . . . Control Register 1 Write Format . . . . . . . . . . . . . . . . . . . Control Register 1 Read Format . . . . . . . . . . . . . . . . . . . Control Register 2 Write Format . . . . . . . . . . . . . . . . . . . Volume Register Write Format . . . . . . . . . . . . . . . . . . . . Data Capture Register (Address and Register Select) Write Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Data Capture Register (Address and Register Select) Serial Out Write Format . . . . . . . . . . . . . . . . . . . . . . . . Data Capture Read Format . . . . . . . . . . . . . . . . . . . . . . . Safeload Register Write Format . . . . . . . . . . . . . . . . . . . . INITIALIZATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power-Up Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . Setting the Clock Mode . . . . . . . . . . . . . . . . . . . . . . . . . . Setting the DATA and MCLK input selectors . . . . . . . . . DATA CAPTURE REGISTERS . . . . . . . . . . . . . . . . . . . . SERIAL DATA INPUT PORT . . . . . . . . . . . . . . . . . . . . . Serial Data Input Modes . . . . . . . . . . . . . . . . . . . . . . . . . DIGITAL CONTROL PINS . . . . . . . . . . . . . . . . . . . . . . . Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . De-emphasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ANALOG OUTPUT SECTION . . . . . . . . . . . . . . . . . . . . PERFORMANCE PLOTS . . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . 27 27 27 27 27 27 27 27 27 28 28 28 28 28 28 28 29 29 31 31 32 32 32 32 33 34 35
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PRELIMINARY TECHNICAL DATA
AD1954SPECIFICATIONS
TEST CONDITIONS UNLESS OTHERWISE NOTED
Supply Voltages (AVDD, DVDD) . . . . . . . . . . . . . . . . . . . 5.0 V Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 25°C Input Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.288 MHz Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TBD Input Sample Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 kHz Measurement Bandwidth . . . . . . . . . . . . . . . 20 Hz to 20 kHz Word Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 bits Load Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TBD Load Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TBD Input Voltage HI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4 V Input Voltage LO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 V
ANALOG PERFORMANCE
Min RESOLUTION SIGNAL-TO-NOISE RATIO (20 Hz to 20 kHz) (Left/Right Output) No Filter (Stereo) With A-Weighted Filter DYNAMIC RANGE (20 Hz to 20 kHz, 60 dB Input) (Left/Right Output) No Filter With A-Weighted Filter TOTAL HARMONIC DISTORTION PLUS NOISE (Left/Right Output) VO = 0.5 dB VO = 20 dB VO = 60 dB OUT-OF-BAND ENERGY (0.5 × fS to 100 kHz) (Left/Right Output) SIGNAL-TO-NOISE RATIO (20 Hz to 20 kHz) (Subwoofer Output) No Filter (Stereo) With A-Weighted Filter DYNAMIC RANGE (20 Hz to 20 kHz, 60 dB Input) (Subwoofer Output) No Filter With A-Weighted Filter TOTAL HARMONIC DISTORTION PLUS NOISE (Subwoofer Output) VO = 0.5 dB VO = 20 dB VO = 60 dB OUT-OF-BAND ENERGY (0.5 × fS to 100 kHz) (Subwoofer Output) ANALOG OUTPUTS Differential Output Range (± Full Scale) Output Capacitance at Each Output Pin CMOUT DC ACCURACY Gain Error Interchannel Gain Mismatch Gain Drift INTERCHANNEL CROSSTALK (EIAJ method) INTERCHANNEL PHASE DEVIATION MUTE ATTENUATION DE-EMPHASIS GAIN ERROR TBD TBD TBD
Typ 24 109 112 109 112 100 92 52
Max
Unit bits dB dB dB dB dB dB dB
72.5 TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD 2.50 ± 1.0 ± 0.015 150 120 ± 0.1 100 ± 0.1
dB dB dB dB dB dB dB dB dB V p-p pF V % dB p p m /° C dB Degrees dB dB
NOTES 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.
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3
PRELIMINARY TECHNICAL DATA AD1954 SPECIFICATIONS (continued)
DIGITAL I/O
Min Input Voltage HI (VIH) Input Voltage LO (VIL) Input Leakage (IIH @ VIH = 2.4 V) Input Leakage (IIL @ VIL = 0.8 V) High Level Output Voltage (VOH) IOH = 1 mA Love Level Output Voltage (VOL) IOL = 1 mA Input Capacitance
Specifications subject to change without notice.
Typ
Max 0.8 10 10
Unit V V µA µA V V pF
2.4
TBD TBD 20
POWER
Min SUPPLIES Voltage, Analog and Digital Analog Current Analog Current, Power-Down Digital Current Digital Current, Power-Down DISSIPATION Operation, Both Supplies Operation, Analog Supplies Operation, Digital Supplies Power-Down, Both Supplies POWER SUPPLY REJECTION RATIO 1 kHz 300 mV p-p Signal at Analog Supply Pins 20 kHz 300 mV p-p Signal at Analog Supply Pins
Specifications subject to change without notice.
Typ 5 TBD TBD TBD TBD TBD TBD TBD
Max 5.5 TBD TBD TBD TBD
Unit V mA mA mA mA mW mW mW mW dB dB
4.5 TBD TBD TBD TBD
TBD TBD TBD
TEMPERATURE RANGE
Min Specifications Guaranteed Functionality Guaranteed Storage
Specifications subject to change without notice.
Typ 25
Max 105 125
Unit °C °C °C
40 55
DIGITAL TIMING
Min tDMP tDMP tDMP tDML tDMH tDBH tDBH tDLS tDLH tDDS tDDH tPDRP MCLK Period (512 fS Mode) MCLK Period (384 fS Mode) MCLK Period (256 fS Mode) MCLK LO Pulsewidth (All Mode) MCLK HI Pulsewidth (All Mode) BCLK LO Pulsewidth BCLK HI Pulsewidth L/RCLK Setup L/RCLK Hold SDATA Setup SDATA Hold PD/RST LO Pulsewidth TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD
Max
Unit ns ns ns ns ns ns ns ns ns ns ns ns
Specifications subject to change without notice.
4
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PRELIMINARY TECHNICAL DATA AD1954
DIGITAL FILTER CHARACTERISTICS
Min Passband Ripple Stopband Attenuation Passband Stopband Group Delay Group Delay Variation
Typ TBD TBD TBD TBD TBD 0
Max
Unit dB dB fS fS sec µs
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5
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