Eval-AD1940EB【PDF 1/32 页】SigmaDSP-TM Multichannel 28-Bit Audio Pr

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SigmaDSP

Multichannel

28-Bit Audio Processor

AD1940

FEATURES

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

Parameter RAM allows complete control of 1,024 parameters

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

Double precision mode for full 56-bit processing

PLL for generating MCLK from 64 × f

, 256 × f

, 384 × f

, or

512 × f

clocks

Hardware-accelerated DSP core

21 kB (6,144 words) data memory for up to 128 ms of audio

delay at f

= 48 kHz

Flexible serial data port with I

S compatible, left-justified,

and right-justified serial port modes

8- and 16-channel TDM input/output modes

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

Rev.

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

Fax: 781.326.8703

APPLICATIONS

Automotive sound systems

Digital televisions

Home theater systems (Dolby Digital/DTS postprocessor)

Multichannel audio systems

Mini-component stereos

Multimedia audio

Digital speaker crossover

Musical instruments

In-seat sound systems (aircrafts/motor coaches)

FUNCTIONAL BLOCK DIAGRAM

The AD1940 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 signal processing used in the AD1940 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.

The AD1940 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 AD1940’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 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 AD1940

is controlled via a 4-wire SPI port.

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