SigmaDSP
TM
28-/56-Bit Audio Processor
Evaluation Boards
EVAL-AD1940EB/AD1941EB
Rev. 0
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EVALUATION BOARD OVERVIEW
This document explains the design and setup of the
AD1940/AD1941 SigmaDSP evaluation boards.
The AD1940EB/1941EB provide a full range of analog and
digital inputs and outputs to and from the AD1940/AD1941.
The SigmaDSP can connect to analog I/O signals through the
AD1939 codec and AD1871 ADC. Digital I/O connections are
available in both S/PDIF and 3-wire serial data formats. The
DSP is controlled by Analog Devices’ SigmaStudio
TM
software,
which interfaces to the evaluation boards with either a USB or
parallel port connection. USB control is available via the EVAL-
ADUSB1 add-on board. Power is distributed by a single supply,
which is regulated to the necessary voltages on the boards. The
PCB is an 8” × 7 ¾” 4-layer design with split analog and digital
power and ground planes on the two inner layers.
PACKAGE CONTENTS
The AD1940EB/AD1941EB packages contain these items:
•
AD1940/AD1941 evaluation board
•
EVAL-ADUSB1 USB adapter
•
SigmaStudio software CD
•
Universal power supply
•
USB cable
•
Evaluation board/software quick-start guide
AD1940/AD1941 DEVICE DESCRIPTION
The AD1940/AD1941 are complete 28-bit, single-chip,
multichannel audio DSPs for equalization, multiband dynamic
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.
(continued on Page 3)
BLOCK DIAGRAM
OUTPUT
PLD
(SIGNAL
ROUTING)
INPUT
PLD
(SIGNAL
ROUTING)
AD1940/
AD1941
PERFORMANCE AUDIO
DSP
EXTERNAL DIGITAL
(I
2
S OUTPUTS)
SPI/I
2
C
INTERFACE
EXTERNAL DIGITAL
(I
2
S INPUT)
POWER SUPPLY
REGULATION
S/PDIF
RECEIVER AND
TRANSMITTER
AD1939
CODEC
AD1871
ADC
ANALOG OUTPUTS
ANALOG INPUTS
05
88
0-
0
01
Figure 1.
Summary of Contents for EVAL-AD1940EB
Page 12: ...EVAL AD1940EB AD1941EB Rev 0 Page 12 of 32 05880 003 Figure 3 AD1939 Analog Input Filters...
Page 13: ...EVAL AD1940EB AD1941EB Rev 0 Page 13 of 32 05880 004 Figure 4 AD1871 Analog Input...
Page 15: ...EVAL AD1940EB AD1941EB Rev 0 Page 15 of 32 05880 006 Figure 6 Input CPLD...
Page 16: ...EVAL AD1940EB AD1941EB Rev 0 Page 16 of 32 05880 007 Figure 7 AD1940 AD1941 SigmaDSP...
Page 17: ...EVAL AD1940EB AD1941EB Rev 0 Page 17 of 32 05880 008 Figure 8 Output CPLD...
Page 20: ...EVAL AD1940EB AD1941EB Rev 0 Page 20 of 32 05880 011 Figure 11 AD1939 Codec...
Page 21: ...EVAL AD1940EB AD1941EB Rev 0 Page 21 of 32 05880 012 Figure 12 External Digital Outputs...
Page 22: ...EVAL AD1940EB AD1941EB Rev 0 Page 22 of 32 05880 013 Figure 13 SPI I2 C Control Interface...
Page 23: ...EVAL AD1940EB AD1941EB Rev 0 Page 23 of 32 05880 014 Figure 14 Power Supply...
Page 30: ...EVAL AD1940EB AD1941EB Rev 0 Page 30 of 32 NOTES...
Page 31: ...EVAL AD1940EB AD1941EB Rev 0 Page 31 of 32 NOTES...
