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Analog Devices Semiconductor Electronic Components Datasheet



AD1953

SigmaDSP 3-Channel/ 26-Bit Signal Processing DAC


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AD1953 pdf
a
SigmaDSP3-Channel, 26-Bit
Signal Processing DAC
AD1953
FEATURES
5 V 3-Channel Audio DAC System
Digital Audio Output (2-Channel or 6-Channel
Packed Mode)
Accepts Sample Rates up to 48 kHz
7 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 Stereo™ 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
2 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)
70 dB Stop-Band 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
APPLICATIONS
2.0/2.1 Channel Audio Systems (2 Main Channels
Plus Subwoofer)
Multichannel Automotive Sound Systems
Multimedia Audio
Mini Component Stereo
Home Theater Systems (AC-3 Postprocessor)
Musical Instruments
In-Seat Sound Systems (Aircraft, Motor Coaches)
PRODUCT OVERVIEW
The AD1953 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 compensa-
tion, 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 AD1953 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)
Flexible Serial Data Port with Right-Justified, Left-Justified,
I2S Compatible, and DSP Serial Port Modes
Auxiliary Digital Input
Graphical Custom Programming Tools
48-Lead LQFP Plastic Package
FUNCTIONAL BLOCK DIAGRAM
SERIAL DATA
OUTPUT
SERIAL DATA
INPUTS
MASTER CLOCK
OUTPUT
MASTER
CLOCK INPUTS
3
3
3
3
AUDIO DATA
MUX
MCLK
MUX
MCLK
GENERATOR
(256/512 fS)
26 ؋ 22
DSP CORE
DATA FORMAT:
3.23 (SINGLE PRECISION)
3.45 (DOUBLE PRECISION)
AD1953
DAC – L
DAC – R
DAC – SW
ANALOG
OUTPUTS
AUX SERIAL
DATA INPUT
SPI DATA
OUTPUT
SPI INPUT
3
SERIAL CONTROL
INTERFACE
RAM
ROM
DATA CAPTURE
OUT/TDM OUT
DIGITAL
OUTPUT
REV. 0
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. Trademarks and
registered trademarks are the property of their respective companies.
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 © 2003 Analog Devices, Inc. All rights reserved.



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AD1953 pdf
AD1953
TABLE OF CONTENTS
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
FUNCTIONAL BLOCK DIAGRAM . . . . . . . . . . . . . . . . . 1
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . 6
ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Package Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
PIN CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . . 7
TYPICAL PERFORMANCE CHARACTERISTICS . . . . . 8
PERFORMANCE PLOTS . . . . . . . . . . . . . . . . . . . . . . . . . . 8
PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Pin Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SIGNAL PROCESSING . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Signal Processing Overview . . . . . . . . . . . . . . . . . . . . . . . 12
Numeric Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Coefficient Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Internal DSP Signal Data Format . . . . . . . . . . . . . . . . . . 13
High-Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Biquad Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Stereo Image Expander . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Main Compressor/Limiter . . . . . . . . . . . . . . . . . . . . . . . . 15
RMS Time Constant . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
RMS Hold Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
RMS Release Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Look-Ahead Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Post-Compression Gain . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Subwoofer Compressor/Limiter . . . . . . . . . . . . . . . . . . . . 17
De-Emphasis Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Using the Sub Reinjection Paths for Systems with No
Subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Interpolation Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SPI PORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SPI Address Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Volume Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Parameter RAM Contents . . . . . . . . . . . . . . . . . . . . . . . . 23
Options for Parameter Updates . . . . . . . . . . . . . . . . . . . . 24
Soft Shutdown Mechanism . . . . . . . . . . . . . . . . . . . . . . . 25
Safeload Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Summary of RAM Modes . . . . . . . . . . . . . . . . . . . . . . . . 25
SPI READ/WRITE DATA FORMATS . . . . . . . . . . . . . . . 26
INITIALIZATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Power-Up Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Setting the Clock Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Setting the Data and MCLK Input Selectors . . . . . . . . . . 28
DATA CAPTURE REGISTERS AND OUTPUTS . . . . . . 28
SERIAL DATA INPUT/OUTPUT PORTS . . . . . . . . . . . . 30
Serial Data Input/Output Modes . . . . . . . . . . . . . . . . . . . 30
DIGITAL CONTROL PIN . . . . . . . . . . . . . . . . . . . . . . . . 31
Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
ANALOG OUTPUT SECTION . . . . . . . . . . . . . . . . . . . . 31
GRAPHICAL CUSTOM PROGRAMMING TOOLS . . . . 32
APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . 34
–2– REV. 0



Part Number AD1953
Description SigmaDSP 3-Channel/ 26-Bit Signal Processing DAC
Maker Analog Devices - Analog Devices
Total Page 30 Pages
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