SigmaDSP™
3-Channel, 26-Bit
Signal Processing DAC
Graphical Custom ProgrammingTools
5V 3-Channel Audio DAC System
44-Lead MQFP or 48-Lead LQFP Plastic Package
Accepts Sample Rates up to 48 kHz
7 Biquad Filter Sections per Channel
Dual Dynamic Processor with Arbitrary Input/Output Curve
and AdjustableTime Constants
0 ms to 6 msVariable Delay/Channel for Speaker Alignment
Stereo Spreading Algorithm for Phat Stereo™ Effect
Program RAM Allows Complete New Program Download
2.0/2.1 Channel Audio Systems (Two Main Channels plus
Subwoofer)
Automotive Sound Systems
Minicomponent Stereo
HomeTheater Systems (AC-3 Postprocessor)
In-Seat Sound Systems (Aircraft, Motor Coaches)
Parameter RAM Allows Complete Control of MoreThan
200 Parameters via SPI Port
SPI Port Features Safe-Upload Mode forTransparent Filter
Updates
2 Control Registers Allow Complete Control of Modes and
MemoryTransfers
Differential Output for Optimum Performance
112 dB Signal-to-Noise (Not Muted) at 48 kHz Sample Rate
(A-Weighted Stereo)
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 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.
70 dB Stop-Band Attenuation
On-Chip ClicklessVolume Control
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.
Hardware and Software Controllable Clickless Mute
Digital De-emphasis Processing for 32 kHz, 44.1 kHz, and
48 kHz Sample Rates
Flexible Serial Data Port with Right-Justified, Left-Justified,
I
2S Compatible, and DSP Serial Port Modes Auxiliary Digital Input
SERIAL DATA
OUTPUT
3
3
AD1954
26 22
DSP CORE
3
3
AUDIO DATA
MUX
SERIAL DATA
INPUTS
DAC – L
DAC – R
DATA FORMAT:
3.23 (SINGLE PRECISION)
3.45 (DOUBLE PRECISION)
MASTER CLOCK
OUTPUT
ANALOG
OUTPUTS
MCLK
GENERATOR
MASTER
CLOCK INPUTS
MCLK
MUX
DAC – SW
(256f /512f )
S
S
AUX SERIAL
DATA INPUT
DATA CAPTURE
OUT
DIGITAL
OUTPUT
SPI DATA
OUTPUT
SERIAL CONTROL
INTERFACE
3
SPI INPUT
RAM
ROM
REV. A
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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 other-
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registered trademarks are the property of their respective companies.
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© 2003 Analog Devices, Inc. All rights reserved.
ADI [ ADI ]
