Analog Devices EVAL-AD1940EB Manual de usuario

SigmaDSPTM 28-/56-Bit Audio Processor

Evaluation Boards

EVAL-AD1940EB/AD1941EB

Rev. 0

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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

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Tel: 781.329.4700 www.analog.com

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’ SigmaStudioTM 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

S OUTPUTS)

SPI/I

INTERFACE

EXTERNAL DIGITAL

S INPUT)

POWER SUPPLY

REGULATION

S/PDIF

RECEIVER AND

TRANSMITTER

AD1939

CODEC

AD1871

ADC

LOG OUTPUTS

LOG INPUTS

05880-001

Figure 1.

EVAL-AD1940EB/AD1941EB

Rev. 0 | Page 2 of 32

TABLE OF CONTENTS

Evaluation Board Overview ............................................................ 1

Package Contents.............................................................................. 1

AD1940/AD1941 Device Description ........................................... 1

Block Diagram .................................................................................. 1

Revision History ............................................................................... 2

AD1940/AD1941 Device Description ........................................... 3

Setting Up the Evaluation Boards................................................... 4

Power Supply................................................................................. 4

Digital Audio Inputs and Outputs ............................................. 4

Analog Audio Inputs and Outputs............................................. 4

Control Interface .......................................................................... 4

Switch and Jumper Functions ......................................................... 5

Rotary Switch Settings ................................................................. 5

IC Functions.................................................................................. 7

LED Functions.............................................................................. 7

Reset ............................................................................................... 7

AD1940EB/AD1941EB Differences ...........................................7

Typical Setups ....................................................................................8

6-Channel Analog Input/ Output ...............................................8

S/PDIF Input/Analog and S/PDIF Output ................................8

Serial Data Input/Output .............................................................8

Evaluation Board Software...............................................................9

SigmaStudio Software Interface ..................................................9

Installing SigmaStudio..................................................................9

Configuring the Board .................................................................9

Using SigmaStudio ..................................................................... 10

Schematics ....................................................................................... 11

PCB Diagrams................................................................................. 24

USB Adapter Schematic................................................................. 28

Ordering Information.................................................................... 29

Ordering Guide .......................................................................... 29

ESD Caution................................................................................ 29

REVISION HISTORY

1/06—Revision 0: Initial Version

EVAL-AD1940EB/AD1941EB

Rev. 0 | Page 3 of 32

AD1940/AD1941 DEVICE DESCRIPTION

(continued from Page 1)

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.

The AD1940/AD1941 are fully-programmable DSPs. 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 digital input and output ports of the AD1940/AD1941 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 channels or 16 channels of

serial data, and can output either 8 channels or 16 channels of

serial data. The input and output port configurations can be set

individually. The AD1940 is controlled via a 4-wire SPI® port; the

AD1941 is controlled by a 2-wire I2C bus.

EVAL-AD1940EB/AD1941EB

Rev. 0 | Page 4 of 32

SETTING UP THE EVALUATION BOARDS

POWER SUPPLY

The AD1940EB/AD1941EB are powered by a single supply

through Coax Power Jack J14. The supply should be 9 V to 12 V

dc with the ability to source at least 700 mA. The connector’s

polarity should be tip positive. This single supply is regulated to

separate 5 V analog and digital planes. The AD1940/AD1941

and AD1939 generate 2.5 V and 3.3 V, respectively, from the 5 V

supply using their on-board regulators.

DIGITAL AUDIO INPUTS AND OUTPUTS

Digital audio I/Os can be connected to the boards in two

different formats. First, the evaluation boards can input or

output a standard 2-channel S/PDIF stream. These I/Os can be

either electrical (Jack J1 and Jack J2) or optical (Fiber Optic

Modules U1 and U5). The input S/PDIF source is selected with

SW10. Both S/PDIF transmit streams are always on. The

S/PDIF I/O streams are connected to SDATA_IN0 and

SDATA_OUT0 and are active according to the specific switch

settings shown in Table 2 and Table 3.

Second, the digital audio I/O connections are in the 3-wire I2S

format. Input Header J11, Output Header J7, and Output

Header J8 can connect to external ADCs, DACs, and codecs

with an I2S left-justified or right-justified data stream. Master

clock, left/right clock, and bit clock connections are also on

these headers. Up to four stereo audio streams can be input or

output on each of these headers. These audio streams, when

selected by the rotary mode switches, interface directly to the

serial data ports of the AD1940/AD1941. These headers also

serve as the I/Os for the multichannel TDM streams.

ANALOG AUDIO INPUTS AND OUTPUTS

The evaluation boards can input six analog audio signals and

can output eight signals. The converters connected to the

AD1940/AD1941 SigmaDSP are a 4 ADC/8 DAC AD1939 and

an AD1871 stereo ADC. The full-scale I/O voltage on these

connections is 1 V rms.

RCA Jack J18 to Jack J20 are the inputs to the ADCs.

RCA Jack J3 to Jack J6 and mini Jack J12, mini Jack J15, and

mini Jack J16 are the DAC output connectors. The output is

low-pass filtered with an anti-image filter and converted from a

differential voltage output to single-ended voltage by op-amps

U28 to U31. The filters’ −3 dB cutoff frequency is 100 kHz and

has an approximate third order Bessel (linear phase) response.

CONTROL INTERFACE

PCB Connector J17 is the connection for the SPI and I2C

control signals. The AD1940EB/AD1941EB typically connect to

the SigmaStudio design tools with the EVAL-ADUSB1 USB

adapter board. This board connects to the PC’s USB port and

outputs either SPI or I2C commands to the AD1940EB/

AD1941EB. The USB adapter is provided with the evaluation

boards, or is available for standalone use in a target system. The

AD1940EB/AD1941EB can also connect directly to a PC’s

parallel port through PCB Connector J17, although this isn’t the

recommended control interface. The software connection is

further explained in the Evaluation Board Software section.

EVAL-AD1940EB/AD1941EB

Rev. 0 | Page 5 of 32

SWITCH AND JUMPER FUNCTIONS

The AD1940EB/AD1941EB have many switch and jumper

settings, but for most uses, many of these need to be set only

once and can be ignored after that. Table 1 shows the function

of each jumper and switch on the evaluation boards. For switch

package S1, logic high (1) is up (assuming analog inputs are at

the top of the boards) and logic low (0) is down. Jumper J21

provides a +20 dB gain in Position A and a +40 dB gain in

Position B.

The functions for SW2 and SW9 are explained in more detail in

Table 2 and Table 3.

Table 1. Switches and Jumpers

Reference

Designator

Function

S1-1 Set PLL_CTRL0

S1-2 Set PLL_CTRL1

S1-3 Set PLL_CTRL2

S1-4 Set ADR_SEL

SW2 Input mode select

SW9 Output mode select

SW6 to SW8 Set direction (I/O) of external MCLKs

LK5/LK14 Select which signal is sent to

AD1940/AD1941 PLL

LK1 Connects/disconnects MCLK input to

AD1939

LK2/LK3 Connect/disconnect 12.288 MHz crystal from

AD1939’s oscillator circuit

J24 Select microphone or line input to AD1871

left channel

LK4 Enables/disables phantom power for

microphone input

SW10 Selects between RCA and optical S/PDIF

input

J21 Sets microphone gain to +20 dB or +40 dB

ROTARY SWITCH SETTINGS

SW2 and SW9 are hex rotary switches that control the input

and output signal routing on the evaluation boards. The

position of these switches controls which serial data signals and

clocks are routed to and from the AD1940/AD1941. Table 2

shows the settings of Rotary Switch SW2. This switch controls

the routing of signals to the AD1940/AD1941 (U1) serial input

port. Table 2 indicates which serial data signals are sent to each

of the four serial data inputs, as well as the clock source. If

“slave” is indicated as the clock source, the LRCLK and BCLK

signals are fed to input CPLD U13 from a source connected to

output CPLD U15. An “x” in the table indicates that no signal is

sent to the input pin on U1 in that mode. Switch Position A to

Switch Position F are unused.

Table 3 shows the settings of Rotary Switch SW9. This switch

controls the routing of the signals out of the AD1940/AD1941

(U1) serial output ports. Table 3 indicates where the serial data

outputs are sent, as well as the source of the LRCLK and BCLK

signals. If “slave” is indicated as the clock source, the LRCLK

and BCLK signals are fed to output CPLD U15 from a source

connected to input CPLD U13. An “x” in the table indicates

that no signal is output from the pin on U1 in that mode. Switch

Position F of SW9 is unused.

Table 2. SW2 Settings

SW2 Position SDATA_IN0 SDATA_IN1 SDATA_IN2 SDATA_IN3 Clock Source

0 S/PDIF 1939 ADC1/2 1939 ADC3/4 Ext In 0 S/PDIF master

1 1939 ADC1 and ADC2 1939 ADC3/4 1871 Ext In 0 1871 master

2 S/PDIF Ext In 0 Ext In 1 Ext In 2 Ext In master

3 1939 ADC1 and ADC2 1939 ADC3/4 Ext In 0 Ext In 1 Slave

4 1939 ADC1 and ADC2 1939 ADC3/4 Ext In 0 S/PDIF 1939 ADC master

5 Ext In 0 Ext In 1 Ext In 2 Ext In 3 Ext In master

6 Ext In 0 Ext In 1 Ext In 2 Ext In 3 Slave

7 x x 1939 (TDM) x 1939 master

8 x x Ext In 2 (TDM) Ext In 3 (TDM) Ext In master

9 x x Ext In 2 (TDM) Ext In 3 (TDM) Slave

EVAL-AD1940EB/AD1941EB

Rev. 0 | Page 6 of 32

Table 3. SW9 Settings

SW9

Position

SDATA_OUT0

SDATA_OUT1,

SDATA_OUT2,

SDATA_OUT3

SDATA_OUT4

SDATA_OUT5,

SDATA_OUT6,

SDATA_OUT7

S/PDIF Tx

O/P 0 Clock Source

O/P 1 Clock

Source

0 AD1939 DAC1

and AD1939

DAC2

Ext Out 0

AD1939 DAC3 to

DAC 8

Ext Out 1 to Ext

Out 3

Ext Out 4 Ext Out 5

Ext Out 6

Ext Out 7

SDATA_OUT0 Slave Slave

1 AD1939 DAC1

and AD1939

DAC2

Ext Out 0

AD1939 DAC3 to

DAC 8

Ext Out 1 to Ext

Out 3

Ext Out 4 Ext Out 5

Ext Out 6

Ext Out 7

SDATA_OUT0 AD1939 DAC Master AD1939 DAC

Master

2 AD1939 DAC1

and AD1939

DAC2

Ext Out 0

AD1939 DAC3 to

DAC 8

Ext Out 1 to Ext

Out 3

Ext Out 4 Ext Out 5

Ext Out 6

Ext Out 7

SDATA_OUT0 AD1940/AD1941

Out 0

AD1940/

AD1941 Out 0

3 AD1939 DAC1

and AD1939

DAC2

Ext Out 0

AD1939 DAC3 to

DAC 8

Ext Out 1 to Ext

Out 3

Ext Out 4 Ext Out 5

Ext Out 6

Ext Out 7

SDATA_OUT0 AD1940/AD1941

Out 1

AD1940/

AD1941 Out 1

4 AD1939 DAC1

and AD1939

DAC2

Ext Out 0

AD1939 DAC3 to

DAC 8

Ext Out 1 to Ext

Out 3

Ext Out 4 Ext Out 5

Ext Out 6

Ext Out 7

SDATA_OUT0 Ext Out 0 Master Ext Out 0

Master

5 AD1939 DAC1

and AD1939

DAC2

AD1939 DAC3 to

DAC 8

Ext Out 4 Ext Out 5

Ext Out 6

Ext Out 7

SDATA_OUT0 AD1940/AD1941

Out 0

AD1940/41

Out 1

6 AD1939 DAC1

and AD1939

DAC2

AD1939 DAC3 to

DAC 8

Ext Out 4

(TDM8)

x SDATA_OUT0 AD1939 DAC Slave

7 AD1939 DAC1

and AD1939

DAC2

AD1939 DAC3 to

DAC 8

Ext Out 4

(TDM8)

x SDATA_OUT0 Ext Out 0 Master Ext Out 1

Master

8 Ext Out 0 Ext Out 1 to Ext

Out 3

Ext Out 4

(TDM8)/1939

x SDATA_OUT0 Ext Out 0 Master Ext Out 1

Master

9 Ext Out 0

(TDM16)

x x x x Ext Out 0 Master Ext Out 0

Master

A Ext Out 0 (TDM8) x Ext Out 4

(TDM8)/1939

x x Slave Slave

B Ext Out 0 (TDM8) x Ext Out 4

(TDM8)/1939

x x AD1940/AD1941

Out 0

AD1940/

AD1941 Out 1

C Ext Out 0 (TDM8) x Ext Out 4

(TDM8)/1939

x x AD1940/AD1941

Out 0

Slave

D Ext Out 0 (TDM8) x Ext Out 4 Ext Out 5

Ext Out 6

Ext Out 7

SDATA_OUT4 AD1940/AD1941

Out 0

AD1940/

AD1941 Out 1

E Ext Out 0 (TDM8) x Ext Out 4 Ext Out 5

Ext Out 6

Ext Out 7

SDATA_OUT4 Ext Out 0 Master Ext Out 1

Master

EVAL-AD1940EB/AD1941EB

Rev. 0 | Page 7 of 32

IC FUNCTIONS

Table 4 explains the function of each IC on the evaluation

boards. The two large Lattice CPLDs (U13 and U15) are used

only for routing signals on the board and do not perform

decoding or signal conditioning.

Table 4. IC Functions

Reference

Designator

Function

U1 AD1940/AD1941 SigmaDSP audio processor

U10 AD1939 4 ADC/8 DAC audio codec

U9 AD1871 stereo ADC

U13, U15 Lattice M4A5-128/64 CPLDs for signal routing

U14,

U17 to U20,

U26 to U31

AD8606 dual op amps for analog audio I/O

buffering

U11 ADP3303-5 LDO Regulator, 5.0 V analog supply

U8 LM317AT, 5.0 V digital supply

U12 ADM811 reset generator

U32, U33 74HC125 for external MCLK I/O buffering

U3 74HC04 for driving LEDs

U22 74HC541 for buffering SPI signals

U2 CS8414 S/PDIF receiver

U4 CS8404 S/PDIF transmitter

LED FUNCTIONS

The four LEDs on the evaluation boards are useful components

that indicate the boards are properly powered and set up. Table

5explains what each LED indicates.

Table 5. LED Functions

Reference

Designator

Function

D1 When lit, U2 is receiving no data, or an invalid

S/PDIF stream.

When dim, U2 is receiving valid S/PDIF data.

D2 When lit, the SPI or I2C connection is inactive.

When dim, an SPI or I2C connection has been

established.

When blinking, an SPI or I2C transaction is

occurring.

D6 Indicates +5 V DVDD

D11 Indicates +5 V AVDD

RESET

The AD1940EB/1941EB can be reset with push-button switch

SW1. This reset signal is debounced by the ADM811 (U12).

This reset signal affects the AD1940/AD1941, AD1939,

AD1871, and S/PDIF receiver and transmitter. The boards can

also be reset by disconnecting the power. After reset, the

AD1940EB/AD1941EB do not pass audio and a control port write

has to be performed so that signals are output again. See the

Using SigmaStudio section for additional information.

AD1940EB/AD1941EB DIFFERENCES

The main difference between the AD1940EB and AD1941EB is

the control port. The AD1940EB uses an SPI control port,

whereas the AD1941EB uses an I2C port. The same PCB is used

for both assemblies, with slight modifications. To accommodate

for I2C communication, the AD1941EB’s CPLDs have slightly

different programs than those of the AD1940EB. Also, the

AD1941EB has Resistor R56, Resistor R57, Resistor R72, and

Resistor R73, while the AD1940EB does not.

EVAL-AD1940EB/AD1941EB

Rev. 0 | Page 8 of 32

TYPICAL SETUPS

6-CHANNEL ANALOG INPUT/ OUTPUT

Input comes from the 6-channel analog inputs to the AD1940/

AD1941 SDATA_IN0 pin, SDATA_IN1 pin, and SDATA_IN2

pin, and outputs on whichever outputs (SDATA_OUTx) are

designed in the SigmaStudio software. Default outputs for the

input are SDATA_OUT0, SDATA_OUT1, and SDATA_OUT2,

or Analog Output 0 to Analog Output 5.

In this setup, the AD1939’s oscillator connected to a

12.288 MHz crystal generates the master clock. The AD1871 is

the serial data clock master, and the AD1939’s and AD1940/

AD1941’s serial data ports are slaves. Table 6 explains how the

switches and jumpers need to be set up for this mode. Any

component setting not mentioned in this table can be

considered as “don’t care.”

Table 6. Evaluation Board Settings for Analog I/O

Component Setting

SW2 Position 1

SW9 Position 0

LK1 Disconnected

LK2/LK3 Connected

LK5/LK14 AD1939

J24 Line

S1 Position 2 up (1), all other positions down (0)

S/PDIF INPUT/ANALOG AND S/PDIF OUTPUT

Input comes from the stereo S/PDIF receiver to the

AD1940/AD1941 SDATA_IN0 pin and outputs on whichever

outputs (SDATA_OUTx) are designed in the SigmaStudio

software. Default outputs for the input are SDATA_OUT0, or

Analog Output 0 or Analog Output 1. SDATA_OUT0 is also

sent to the S/PDIF transmitter.

In this setup, the master clock and serial data clocks are generated

by the CS8414. Table 7 explains how the switches and jumpers

need to be set up for this mode. Any component setting not

mentioned in this table can be considered as “don’t care.”

Table 7. Evaluation Board Settings for S/PDIF Input/Analog

and S/PDIF Output

Component Setting

SW2 Position 0

SW9 Position 0

LK1 Connected

LK2/LK3 Disconnected

LK5/LK14 S/PDIF

SW10 Selects S/PDIF source from either optical or RCA

S1 Position 2 up (1), all other positions down (0)

SERIAL DATA INPUT/OUTPUT

This mode is intended to be used to connect to external devices,

such as ADCs, DACs, or compressed audio (such as AC-3)

decoders. Input comes from the external Input Header J11 and

feeds the AD1940/AD1941 SDATA_IN0 pin, SDATA_IN1 pin,

SDATA_IN2 pin, and SDATA_IN3 pin. Output is on Output

Header J7 and Output Header J8. The specific output pins

(SDATA_OUTx) are designated in the SigmaStudio software.

The signals on these headers are directly connected to the

AD1940/AD1941 using I2S, left-justified, or right-justified

modes. Default outputs for the input are SDATA_OUT0,

SDATA_OUT1, SDATA_OUT2, and SDATA_OUT3, or Analog

Output 0 to Analog Output 5. If the master clock is to be output

on Output Header J7, a second jumper needs to be placed on

Jumper LK5/LK14 at Position Intf-Out0. For the master clock to

be output on Output Header J8, an additional jumper must be

placed in Position Intf-Out. In order to avoid multiple clocks

driving the MCLK line, ensure that SW6 to SW8 are set

properly before placing these jumpers.

In this setup, the master clock and serial data clocks are

generated by the external source.

Table 8 explains how the switches and jumpers need to be set up

for this mode. Any component setting not mentioned in this

table can be considered as “don’t care.”

Table 8. Evaluation Board Settings for Serial Data I/O

Component Setting

SW2 Position 5

SW9 Position 0

LK1 Connected

LK2/LK3 Disconnected

LK5/LK14 Intf-In

SW6 In (down)

SW7 Out (right), if the master clock is to be output on

the serial data headers

SW8 Out (left), if the master clock is to be output on

the serial data headers

S1 Position 2 up (1), all other positions down (0)

EVAL-AD1940EB/AD1941EB

Rev. 0 | Page 9 of 32

EVALUATION BOARD SOFTWARE

SIGMASTUDIO SOFTWARE INTERFACE

The AD1940/AD1941 SigmaDSP is controlled by Analog

Devices’ SigmaStudio software. This software allows the

developer to graphically build a fully customized audio signal

processing flow. SigmaStudio generates run-time DSP code that

is downloaded to the SigmaDSP through its SPI or I2C control

port. This connection on the evaluation board is DB25 PCB

Connector J17. This connector allows the SigmaDSP to connect

to a PC running SigmaStudio by either USB, Analog Devices’

EVAL-ADUSB1 adapter, or directly to a parallel port. Both SPI

and I2C communications can be used with the USB adapter, but

only SPI can be used with the parallel port.

INSTALLING SIGMASTUDIO

The evaluation board cannot be run with a PC until the

SigmaStudio software has been installed. SigmaStudio must be

installed on a PC running Microsoft® Windows® 2000 or

Windows XP.

Follow theses steps to properly install the software and drivers.

1. Insert the SigmaStudio CD and browse the disc.

2. Double-click dotnetfx.exe to install Microsoft .NET

Framework version 1.1.

.NET installation can be skipped if version 1.1 or newer

has already been installed from either

www.windowsupdate.com or

http://www.microsoft.com/net/

3. Double-click setup.exe and follow the prompts to install

SigmaStudio.

4. Restart the PC if this is the first time installing

SigmaStudio. You must restart the PC for the parallel port

driver to function.

If the evaluation board is being used only with a parallel port

control connection, you can skip the USB adapter installation

located in the Configuring the Board section.

CONFIGURING THE BOARD

The EVAL-ADUSB1 (USB Adapter) allows SigmaStudio to

control the evaluation board through the PC’s USB port. The

USB adapter is powered with +5 V through the USB port. Using

the USB adapter is preferred over the parallel connection

because of its faster control port speed. The AD1941EB can

only be controlled with the USB adapter because the PC’s

parallel port cannot run as a true I2C port.

Follow these steps to set up the USB adapter on a PC.

1. Plug the USB adapter into the evaluation board’s PCB

Connector J17.

2. Connect the USB cable to your computer and the USB

serial converter.

3. For Windows 2000: When prompted for drivers, click

Search for a suitable driver and then click Next. Select

Specify a location and deselect the other options. Click

Next.

4. For Windows XP: When prompted for drivers, click Install

from a list or a specific location. Click Search for the

best driver in these locations. Select Include this location

in the search.

5. Click Browse and find the ftd2xx.inf file in the USB

drivers subdirectory of your SigmaStudio installation. By

default, this location is C:\Program Files\Analog Devices

Inc\Sigma Studio\USB drivers.

6. In Windows XP, if you are prompted with a message that

the software hasn’t passed Windows Logo testing, click

Continue Anyway.

The USB adapter and SigmaStudio software can also be used

separately from the evaluation board in a target SigmaDSP-

based system. In this case, the tools should be set up as if they

were connecting to the evaluation board and the USB adapter

still outputs SPI or I2C signals that can interface to the target

SigmaDSP. Tabl e 9 shows the necessary pins to connect to the

USB adapter in a target system. This setup is useful for real-time

debugging, or for tuning a program or parameters in the actual

target system. The USB adapter board can be ordered separately

from the evaluation board if more are needed. One USB adapter

board is provided with each evaluation board. The USB adapter

schematic is shown in Figure 19.

Table 9. USB Adapter Signal Pins

Pin No. Signal

2 CCLK (SPI), SCK (I2C)

3 CLATCH_AD1940/41

4 CDATA

9 SDA

13 COUT

18 to 25 Ground

EVAL-AD1940EB/AD1941EB

Rev. 0 | Page 10 of 32

USING SIGMASTUDIO

The AD1940/AD1941 do not pass an audio signal on power-up.

First, the user must write to Bit 9 of the DSP core control

procedure can be done manually. Bit 9 is always set to 1 after

the program and parameter loading procedure is completed by

clicking the 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 Si[email protected] for login information.

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