Analog Devices EVAL-AD1940EB Manual
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Analog Devices EVAL-AD1940EB Manual

Analog Devices EVAL-AD1940EB Manual

Sigmadsp 28-/56-bit audio processor evaluation boards
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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
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.
EXTERNAL DIGITAL
Rev. 0
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.
SigmaDSP
TM
software,
ANALOG INPUTS
AD1871
ADC
POWER SUPPLY
REGULATION
2
(I
S INPUT)
INPUT
PLD
(SIGNAL
ROUTING)
S/PDIF
RECEIVER AND
TRANSMITTER
SPI/I
INTERFACE
TM
28-/56-Bit Audio Processor
EVAL-AD1940EB/AD1941EB

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.

BLOCK DIAGRAM

ANALOG OUTPUTS
AD1939
CODEC
DSP
PERFORMANCE AUDIO
AD1940/
AD1941
2
C
Figure 1.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Evaluation Boards
(continued on Page 3)
OUTPUT
PLD
(SIGNAL
ROUTING)
EXTERNAL DIGITAL
2
(I
S OUTPUTS)
©2006 Analog Devices, Inc. All rights reserved.
www.analog.com

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Summary of Contents for Analog Devices EVAL-AD1940EB

  • Page 1: Evaluation Board Overview

    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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

  • Page 2: Table Of Contents

    EVAL-AD1940EB/AD1941EB TABLE OF CONTENTS Evaluation Board Overview ............1 AD1940EB/AD1941EB Differences ...........7 Package Contents................1 Typical Setups ..................8 AD1940/AD1941 Device Description ........... 1 6-Channel Analog Input/ Output ..........8 Block Diagram .................. 1 S/PDIF Input/Analog and S/PDIF Output ........8 Revision History ................2 Serial Data Input/Output .............8...

  • Page 3: Ad1940/Ad1941 Device Description

    EVAL-AD1940EB/AD1941EB AD1940/AD1941 DEVICE DESCRIPTION (continued from Page 1) The digital input and output ports of the AD1940/AD1941 allow The signal processing used in the AD1940/AD1941 is a glueless connection to ADCs and DACs by multiple, 2-channel comparable to that found in high end studio equipment. Most serial data streams or TDM data streams.

  • Page 4: Setting Up The Evaluation Boards

    EVAL-AD1940EB/AD1941EB SETTING UP THE EVALUATION BOARDS POWER SUPPLY ANALOG AUDIO INPUTS AND OUTPUTS The AD1940EB/AD1941EB are powered by a single supply The evaluation boards can input six analog audio signals and through Coax Power Jack J14. The supply should be 9 V to 12 V can output eight signals.

  • Page 5: Switch And Jumper Functions

    EVAL-AD1940EB/AD1941EB SWITCH AND JUMPER FUNCTIONS ROTARY SWITCH SETTINGS The AD1940EB/AD1941EB have many switch and jumper settings, but for most uses, many of these need to be set only SW2 and SW9 are hex rotary switches that control the input once and can be ignored after that. Table 1 shows the function and output signal routing on the evaluation boards.
  • Page 6 EVAL-AD1940EB/AD1941EB Table 3. SW9 Settings SDATA_OUT1, SDATA_OUT5, SDATA_OUT2, SDATA_OUT6, O/P 1 Clock Position SDATA_OUT0 SDATA_OUT3 SDATA_OUT4 SDATA_OUT7 S/PDIF Tx O/P 0 Clock Source Source AD1939 DAC1 AD1939 DAC3 to Ext Out 4 Ext Out 5 SDATA_OUT0 Slave Slave and AD1939...

  • Page 7: Ic Functions

    EVAL-AD1940EB/AD1941EB IC FUNCTIONS RESET Table 4 explains the function of each IC on the evaluation The AD1940EB/1941EB can be reset with push-button switch boards. The two large Lattice CPLDs (U13 and U15) are used SW1. This reset signal is debounced by the ADM811 (U12).

  • Page 8: Typical Setups

    EVAL-AD1940EB/AD1941EB TYPICAL SETUPS 6-CHANNEL ANALOG INPUT/ OUTPUT SERIAL DATA INPUT/OUTPUT Input comes from the 6-channel analog inputs to the AD1940/ This mode is intended to be used to connect to external devices, AD1941 SDATA_IN0 pin, SDATA_IN1 pin, and SDATA_IN2 such as ADCs, DACs, or compressed audio (such as AC-3) pin, and outputs on whichever outputs (SDATA_OUTx) are decoders.

  • Page 9: Evaluation Board Software

    Connector J17. This connector allows the SigmaDSP to connect Search for a suitable driver and then click Next. Select to a PC running SigmaStudio by either USB, Analog Devices’ Specify a location and deselect the other options. Click EVAL-ADUSB1 adapter, or directly to a parallel port. Both SPI Next.

  • Page 10: Using Sigmastudio

    Link-Compile-Download button in SigmaStudio. Refer to the software’s online help document for additional information about using SigmaStudio with the AD1940EB/AD1941EB. Software updates are provided via Analog Devices’ FTP site. Please e-mail SigmaDSP@analog.com for login information. Rev. 0 | Page 10 of 32...

  • Page 11: Schematics

    EVAL-AD1940EB/AD1941EB SCHEMATICS Figure 2. S/PDIF Receiver and Transmitter Rev. 0 | Page 11 of 32...
  • Page 12 EVAL-AD1940EB/AD1941EB Figure 3. AD1939 Analog Input Filters Rev. 0 | Page 12 of 32...
  • Page 13 EVAL-AD1940EB/AD1941EB Figure 4. AD1871 Analog Input Rev. 0 | Page 13 of 32...
  • Page 14 EVAL-AD1940EB/AD1941EB Figure 5. External Digital Inputs and Microphone Input Rev. 0 | Page 14 of 32...
  • Page 15 EVAL-AD1940EB/AD1941EB Figure 6. Input CPLD Rev. 0 | Page 15 of 32...
  • Page 16 EVAL-AD1940EB/AD1941EB Figure 7. AD1940/AD1941 SigmaDSP Rev. 0 | Page 16 of 32...
  • Page 17 EVAL-AD1940EB/AD1941EB Figure 8. Output CPLD Rev. 0 | Page 17 of 32...
  • Page 18 EVAL-AD1940EB/AD1941EB Figure 9. Analog Output 0 to Analog Output 3 Rev. 0 | Page 18 of 32...
  • Page 19 EVAL-AD1940EB/AD1941EB Figure 10. Analog Output 4 to Analog Output 7 Rev. 0 | Page 19 of 32...
  • Page 20 EVAL-AD1940EB/AD1941EB Figure 11. AD1939 Codec Rev. 0 | Page 20 of 32...
  • Page 21 EVAL-AD1940EB/AD1941EB Figure 12. External Digital Outputs Rev. 0 | Page 21 of 32...
  • Page 22 EVAL-AD1940EB/AD1941EB Figure 13. SPI/I C Control Interface Rev. 0 | Page 22 of 32...
  • Page 23 EVAL-AD1940EB/AD1941EB Figure 14. Power Supply Rev. 0 | Page 23 of 32...

  • Page 24: Pcb Diagrams

    EVAL-AD1940EB/AD1941EB PCB DIAGRAMS Figure 15. Top Layer Silkscreen Rev. 0 | Page 24 of 32...
  • Page 25 EVAL-AD1940EB/AD1941EB ANALOG INPUTS INPUT POWER SUPPLY AD1871 ANALOG OUTPUTS EXT INTF INPUT AD1939 CODEC AD1940/ AD1941 SigmaDSP S/PDIF INPUT RECEIVER CPLD OUTPUT CPLD S/PDIF TRANSMITTER SPI/I EXT INTF OUTPUT CONTROL INTERFACE RESET CIRCUIT Figure 16. Evaluation Board Subsections Rev. 0 | Page 25 of 32...
  • Page 26 EVAL-AD1940EB/AD1941EB LK14 SW10 Figure 17. Evaluation Board Jumpers and Switches Rev. 0 | Page 26 of 32...
  • Page 27 EVAL-AD1940EB/AD1941EB LK14 SW10 Figure 18. Evaluation Board Jumper and Switch Default Settings Rev. 0 | Page 27 of 32...

  • Page 28: Usb Adapter Schematic

    EVAL-AD1940EB/AD1941EB USB ADAPTER SCHEMATIC Figure 19. USB Adapter Schematic Rev. 0 | Page 28 of 32...

  • Page 29: Ordering Information

    EVAL-AD1940EB/AD1941EB ORDERING INFORMATION ORDERING GUIDE Model Description Eval-AD1940EB Evaluation Board Eval-AD1941EB Evaluation Board Eval-ADUSB1 Evaluation Board ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges.
  • Page 30 EVAL-AD1940EB/AD1941EB NOTES Rev. 0 | Page 30 of 32...
  • Page 31 EVAL-AD1940EB/AD1941EB NOTES Rev. 0 | Page 31 of 32...
  • Page 32 EVAL-AD1940EB/AD1941EB NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB05880-0-1/06(0) Rev. 0 | Page 32 of 32...

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