SigmaDSP Multichannel
28-Bit Audio Processor
AD1940/AD1941
FEATURES
APPLICATIONS
16-channel digital audio processor
Accepts sample rates up to 192 kHz
28-bit × 28-bit multiplier with full 56-bit accumulator
Fully programmable program RAM for custom
program download
Automotive sound systems
Digital televisions
Home theater systems (Dolby digital/DTS postprocessor)
Multichannel audio systems
Mini-component stereos
Parameter RAM allows complete control of 1,024 parameters
Multimedia audio
Control port features safeload for transparent parameter
updates and complete mode and memory transfer control
Target/slew RAM for click-free volume control and dynamic
parameter updates
Digital speaker crossover
Musical instruments
In-seat sound systems (aircrafts/motor coaches)
FUNCTIONAL BLOCK DIAGRAM
Double precision mode for full 56-bit processing
PLL for generating MCLK from 64 × fS, 256 × fS, 384 × fS, or
512 × fS clocks
4
Hardware-accelerated DSP core
AD1940/AD1941
21 kB (6,144 words) data memory for up to 128 ms of audio
delay at fs = 48 kHz
VOLTAGE
REGULATOR
Flexible serial data port with I2S-compatible, left-justified,
and right-justified serial port modes
8- and 16-channel TDM input/output modes
2
28 × 28
2
SERIAL DATA/
DSP CORE
TDM INPUTS
2
On-chip voltage regulator for compatibility with 3.3 V and
5 V systems
Programmable low power mode
Fast start-up and boot time from power-on or reset
48-lead LQFP plastic package
DATA FORMAT:
SERIAL
DATA/
TDM
5.23 (SINGLE
PRECISION)
MASTER
CLOCK
INPUT
PLL
OUTPUTS
10.46 (DOUBLE
PRECISION)
SERIAL
CONTROL
INTERFACE
4
2
SPI/I C I/O
RAM
ROM
Figure 1.
GENERAL DESCRIPTION
The AD1940/AD1941 are a complete 28-bit, single-chip, multi-
The AD1940/AD1941 are a fully programmable DSP. Easy to
use software allows the user to graphically configure a custom
signal processing flow using blocks such as biquad filters, dyna-
mics processors, and surround sound processors. An extensive
control port allows click-free parameter updates, along with
readback capability from any point in the algorithm flow.
channel audio SigmaDSP™ for equalization, multiband dynamic
processing, delay compensation, speaker compensation, and
image enhancement. These algorithms can be used to compen-
sate for the real world limitations of speakers, amplifiers, and
listening environments, resulting in a dramatic improvement of
perceived audio quality.
The AD1940/AD1941’s digital input and output ports allow a
glueless connection to ADCs and DACs by multiple, 2-channel
serial data streams or TDM data streams. When in TDM mode,
the AD1940/AD1941 can input 8 or 16 channels of serial data,
and can output 8 or 16 channels of serial data. The input and
output port configurations can be individually set. The AD1940
is controlled by a 4-wire SPI® port; the AD1941 is controlled by
The signal processing used in the AD1940/AD1941 is
comparable to that found in high end studio equipment. Most
of the processing is done in full, 56-bit double-precision mode,
resulting in very good, low level signal performance and the
absence of limit cycles or idle tones. The dynamics processor
uses a sophisticated, multiple-breakpoint algorithm often found
in high end broadcast compressors.
a 2-wire I2C® bus. Other than the control interface, the
functions of the two parts are identical.
Rev. B
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.
Specifications subject to change without notice. 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 owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113©2004–2010 Analog Devices, Inc. All rights reserved.
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