SigmaDSPTM Multichannel
28-Bit Audio Processor
Preliminary Technical Data
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)
Double precision mode for full 56-bit processing
PLL for generating MCLK from 64 × fS, 256 × fS, 384 × fS, or
512 × fS clocks
FUNCTIONAL BLOCK DIAGRAM
4
Hardware-accelerated DSP core
21 kB (6,144 words) data memory for up to 128 ms of audio
delay at fs = 48 kHz
AD1940
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
28 × 28
2
DSP CORE
2
SERIAL DATA/
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
SPI I/O
RAM
ROM
Figure 1.
GENERAL DESCRIPTION
The AD1941 is a complete 28-bit, single-chip, multichannel
audio DSP for equalization, multiband dynamics processing,
delay compensation, speaker compensation, and image
enhancement. These algorithms can be used to compensate for
the real-world limitations of speakers, amplifiers, and listening
environments, resulting in a dramatic improvement of
perceived audio quality.
The AD1941 is 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, dynamics
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.
The 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
AD1941 can input 8 or 16 channels of serial data, and can
output either 8 or 16 channels of serial data. The input and
output port configurations can be individually set. The AD1941
is controlled on a 2-wire I2C bus.
The signal processing used in the 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 sophisti-
cated, multiple-breakpoint algorithm often found in high end
broadcast compressors.
Rev. PrE
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