SBAU012_技术文档

®

DEM-DAI1604

EVALUATION FIXTURE

● REQUIRES THREE POWER SUPPLIES:

FEATURES

+5V, +15V, AND –15V

● COMPLETE EVALUATION PLATFORM FOR

THE PCM1604 SIX-CHANNEL AUDIO D/A

CONVERTER

● ON-BOARD REGULATOR GENERATES

+3.3V FROM THE +5V SUPPLY

● SUPPORTS AN OPTIONAL EXTERNAL

● DIGITAL AUDIO INTERFACE SUPPORTS

S/PDIF INPUTS UP TO 96kHz FROM COM-

MERCIAL AUDIO EQUIPMENT AND AUDIO

MEASUREMENT SYSTEMS (Both RCA and

Optical Input Connectors Provided)

+3.3V SUPPLY

DESCRIPTION

The DEM-DAI1604 demonstration board provides an

ideal platform for evaluating the performance and

operation of the PCM1604 six-channel audio digital-

to-analog converter. Demonstration software is in-

cluded for controlling the PCM1604’s programmable

functions. The D/A converter outputs are filtered and

passed on to RCA jacks for connection to audio

measurement equipment and commercial audio gear.

A digital audio receiver allows connection to S/PDIF

data streams, while an on-board connector provides an

interface to audio Digital Signal Processors (DSP) and

decoders.

● DUAL IN-LINE HEADER SUPPORTS CON-

NECTION TO AN EXTERNAL AUDIO DSP

OR DECODER

● 2ND-ORDER LOW-PASS ACTIVE FILTERS

FOR EACH DAC OUTPUT

● INCLUDES DEMONSTRATION SOFTWARE

FOR WRITING AND READING PCM1604

CONTROL REGISTERS (Requires a PC with

Microsoft Windows^®3.1, 95, or 98)

● CENTRONICS CONNECTOR PROVIDED

FOR CONNECTION TO A PC PRINTER PORT

(Required for Demonstration Software)

BLOCK DIAGRAM

ML MC MDI RST MDO

GND +3.3V

GND +5V –15V GND +15V

3.3V

+5V

REG.

SW5

V

_OUT1

2nd-Order LPF

Opt

JUMPER

SYSCLK

OPA2134

V_OUT2

L/R ch

SCKO

Digital

PCM1604

Daughter

Card

BCLK

LRCK

DIN1

DIN2

DIN3

Audio

Receiver

and

V_OUT

3

L/R ch

2nd-Order LPF

OPA2134

Coax

Logic

V

_OUT4

_OUT5

V

2nd-Order LPF

OPA2134

V_OUT6

SW1 - SW3

Format Control

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111

Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

®

LI-554

1

Printed in U.S.A. April, 2000

DEM-DAI1604

SBAU012

PC PRINTER PORT INTERFACE

GENERAL DISCUSSION

POWER SUPPLIES

A Centronics connector is included so that the DEM-DAI1604

may be connected to a PC printer port. The demonstration

software included with the DEM-DAI1604 uses this connec-

tion to write and read the PCM1604’s internal registers

through the MDO, MDI, MC, and ML pins.

The DEM-DAI1604 requires three external supplies: a +5V

supply (V_CC) is required for the PCM1604; a digital audio

receiver (U3); and associated logic circuitry (U3, U4). An

on-board regulator (Burr-Brown REG1117-3.3) is used to

generate +3.3V from V_CC, which is required by the PCM1604

and associated buffers (U5, U6). The output of the regulator

can be disabled by a jumper (JP3) and an external +3.3V

supply may then be provided at connector CN4.

CONNECTORS

CN1 is the main power supply connector. Connections for

V_CC, +V_S, –V_S, and power supply grounds are provided.

CN2 is the zero flag connector. Connector pins ZFLGA and

ZFLG1 through ZFLG6 correspond directly to the zero flag

output pins of the PCM1604. Alternatively, the zero flag

outputs may be used as general purpose logic outputs.

The op amps used for the low-pass active filters (U50

through U52 ) require positive and negative power supplies.

The +V_Ssupply is typically +15V, with a maximum value of

+18V and a minimum value of +5V. The –V_Ssupply is

typically –15V, with a minimum value of –18V and a

maximum value of –5V.

CN3 is a Centronics connector used to interface the DEM-

DAI1604 to a PC printer port. The +5V logic signals from

the printer port are buffered by U6.

The power supplies used for V_CC, +V_S, and –V_Sshould be

well regulated and filtered. Switching power supplies may

be used, but linear regulated supplies are recommended for

optimal performance. All supplies should be rated for a

minimum of 500mA of output current.

CN4 is used to connect an optional external +3.3V power

supply to the DEM-DAI1604. Typically, this connector is

not used since an on-board regulator IC (U8) is used to

generate the +3.3V supply. If an external +3.3V supply is

used, remove the jumper at JP3.

DIGITAL AUDIO INTERFACE

CN10 through CN13 provide the connection to the PCM1604

daughter board. Figure 1 shows the electrical connections

for CN10 through CN13. Figure 4 shows the daughter card

schematic. The mapping between the daughter card connec-

tors and CN10 through CN13 is shown in Table I.

The digital audio interface is provided by a Crystal CS8414

digital audio receiver (U3). The interface is used to receive

a stereo, linear PCM, S/PDIF data stream from either an

electrical or optical source. The electrical input is furnished

by an RCA connector (PJ1), while the optical input is

provided by a Toshiba TOSLINK optical receiver (OPT).

S/PDIF streams are available from industry standard audio

test systems (Audio Precision, Rhode & Schwarz), as well as

commercial audio equipment (DVD, CD, and DAT players).

DEM-DAI1604 CONNECTOR

DAUGHTER CARD CONNECTOR

CN10

CN11

CN12

CN13

CN001

CN002

CN003

CN004

The CS8414 outputs a stereo data stream at it’s SDATA pin.

This may be used by any or all of the PCM1604’s three data

inputs, DIN1 through DIN3. Jumper block JP2 is used to

connect the CS8414 data output to the desired PCM1604

data input pins.

TABLE I. Daughter Card Connector Mapping.

OPT is the optical receiver input to the CS8414 digital audio

receiver.

PCM1604 DAUGHTER CARD

PJ1 is the RCA connector used for shielded cable input to the

CS8414 digital audio receiver.

The PCM1604 package is soldered directly to a small

printed circuit board, referred to as the “daughter card.”

PJ2 is the audio output connector corresponding to the

PCM1604’s V_OUT1 output.

The daughter card includes four male connectors which plug

into four corresponding female connectors on the DEM-

DAI1604 board. The daughter card arrangement is used to

provide the best possible dynamic performance, while al-

lowing the PCM1604 to be easily interchanged with future

multi-channel D/A products.

PJ3 is the audio output connector corresponding to the

PCM1604’s V_OUT2 output.

PJ4 is the audio output connector corresponding to the

PCM1604’s V_OUT3 output.

PJ5 is the audio output connector corresponding to the

PCM1604’s V_OUT4 output.

DAC OUTPUT FILTERS

PJ6 is the audio output connector corresponding to the

PCM1604’s V_OUT5 output.

Three dual op amps (Burr-Brown OPA2134 ) are included to

provide 2nd-Order Butterworth low-pass filters for the DAC

outputs. These filters are required to attenuate the out-of-

band noise generated by the PCM1604’s delta-sigma

D/A converters.

PJ7 is the audio output connector corresponding to the

PCM1604’s V_OUT6 output.

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2

DEM-DAI1604

SWITCHES

JUMPERS

Switches SW1 through SW3 are used to select the audio data

output format for the CS8414. Table II shows the output

format selections that are used with the PCM1604.

Jumper JP1 is used to select a non-inverted (NML) or

inverted (INV) bit clock for the PCM1604. Table IV shows

the proper settings for JP1 for the four input data formats

shown in Table II.

SW1

SW2

SW3

DATA FORMAT

JP1 SELECTION

L

H

L

H

L

H

L

16-24 Bit Left-Justified, MSB-First⁽¹⁾

16-24 Bit I²S⁽²⁾

16-bit Standard Right-Justified, MSB-First⁽²⁾

18-bit Standard Right-Justified, MSB-First⁽²⁾

16 - 24-Bit Left-Justified, MSB-First

16 - 24-Bit I²S

16-Bit, Standard Right-Justified, MSB-First

18-Bit, Standard Right-Justified, MSB-First

INV

NML

H

NOTE: (1) Jumper JP1 must be set to the INV position when using this format.

(2) Jumper JP1 must be set to the NML position when using this format.

TABLE IV. JP1 Jumper Selection for Audio Data Formats.

TABLE II. Digital Audio Receiver Output Data Format

Settings.

Jumper block JP2 is used to connect the digital audio

receiver output data and clocks to the PCM1604 daughter

card. The jumpers may be removed from JP2 to allow

connection to an audio DSP or decoder. Figure 1 shows the

electrical connections for JP2. Note that pins DIN1 through

DIN3 include 10kΩ pull-down resistors, which may be used

to set the data inputs to logic ‘0’ for testing zero detection

functions and output cross talk performance.

Switch SW5 is used to set the state of the reset (RST) pin of

the PCM1604. Table III shows the reset selections.

CKS0 and CKS1 are unused and should be set to ‘L’.

RST

MODE OF OPERATION

Jumper JP3 is used to enable or disable the on-board +3.3V

regulator output. When the jumper is installed, the regulator

is used as the +3.3V supply. When it is removed, an external

supply, connected at CN4, may be used to supply the +3.3V.

L

H

Normal

Reset⁽¹⁾

NOTE: (1) The RST pin of the PCM1604 is active LOW. Due to the demo

board design, the ‘H’ selection closes the switch and connects RST to

ground. The ‘L’ selection opens the switch and the RST pin is set to

logic ‘1’ by an internal pull-up resistor.

SCHEMATICS

TABLE III. Reset (RST) Operation.

Schematics for the DEM-DAI1604 are shown in Figures 1

through 4. Figure 1 shows the digital audio receiver, associ-

ated logic, and digital I/O connectors. Figure 2 shows the

DAC low pass filters, while Figure 3 illustrates the power

supply connections. Figure 4 shows the PCM1604 daughter

card circuitry and connectors.

®

3

DEM-DAI1604

C C

V

C C

V

Z F L G 6

Z F L G 5

Z F L G 4

Z F L G 3

Z F L G 2

Z F L G 1

Z F L G A

G N D

N C

M D O

M D I

M C

M L

3 6

1 8

3 5

1 7

3 4

1 6

3 3

1 5

3 2

1 4

3 1

1 3

3 0

1 2

2 9

1 1

2 8

1 0

2 7

R S T

Z F L G A

Z F L G 1

Z F L G 2

Z F L G 3

Z F L G 4

Z F L G 5

Z F L G 6

G N D

M D O

9

8

7

6

5

4

3

2

1

2 6

2 5

2 4

2 3

2 2

2 1

2 0

1 9

R S T

M D I

M C

M L

6

5

4

2

FIGURE 1. Main Schematic for the DEM-DAI1604.

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4

DEM-DAI1604

R₅₆

15kΩ

C₅₆

270pF

R₅₀

8.2kΩ

R₆₂

1kΩ

R₆₈

100Ω

2

V_OUT

1

2

3

4

PJ2

PJ3

PJ4

PJ5

1

7

1

7

U50

OPA2134

DAC1 AOUT

DAC2 AOUT

DAC3 AOUT

DAC4 AOUT

DAC5 AOUT

3

C₅₀

2700pF

R₅₇

15kΩ

C₅₇

270pF

R₅₁

8.2kΩ

R₆₃

1kΩ

R₆₉

100Ω

6

U50

OPA2134

5

C₅₁

2700pF

R₅₈

15kΩ

C₅₈

270pF

R₅₂

8.2kΩ

R₆₄

1kΩ

R₇₀

100Ω

2

U51

OPA2134

3

C₅₂

2700pF

R₅₉

15kΩ

C₅₉

270pF

R₅₃

8.2kΩ

R₆₅

1kΩ

R₇₁

100Ω

6

U51

OPA2134

5

C₅₃

2700pF

R₆₀

15kΩ

C₆₀

270pF

R₅₄

8.2kΩ

R₆₆

1kΩ

R₇₂

100Ω

2

V_OUT

5

PJ6

1

U52

OPA2134

3

C₅₄

2700pF

R₆₁

15kΩ

C₆₁

270pF

R₅₅

R₆₇

8.2kΩ

1kΩ

R₇₃

6

V_OUT

6

PJ7

100Ω

7

U52

OPA2134

DAC6 AOUT

5

C₅₅

2700pF

FIGURE 2. DAC Output Filters.

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5

DEM-DAI1604

FIGURE 3. Power Supply Connections.

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6

DEM-DAI1604

O U T

A G N D 2

A G N D 1

A G N D 0

3

4

5

6

V

2 5

2 6

2 7

2 8

2 9

3 0

3 1

3 2

3 3

3 4

3 5

3 6

1 2

1 1

1 0

9

C C

O U T

2

1

0

V

O U T

V

C C

O U T

C C

V

C C

V

8

C C

V

A G N D

G N D

7

N C

Z E R O 6 / G P O 6

6

Z E R O 5 / G P O 5

5

Z E R O 4 / G P O 4

4

Z E R O 3 / G P O 3

3

Z E R O 2 / G P O 2

2

Z E R O 1 / G P O 1

1

Z

M D O

M D I

Z

M D O

M D I

M C

Z

M C

M L

Z

M L

Z

R S T

G N

FIGURE 4. PCM1604 Daughter Card.

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7

DEM-DAI1604

DEMONSTRATION SOFTWARE

The Execute menu includes three selections: Initialize, Re-

set, and Exit. Selecting Initialize will instruct the program to

write all of the PCM1604’s internal registers with the default

values. Selecting Reset will instruct the program to rewrite

the PCM1604’s internal registers with the data currently

selected in the application windows. Selecting Exit will

close the application.

Software is provided with the DEM-DAI1604 to allow

programming of the PCM1600’s internal registers. The soft-

ware will operate on computers running Microsoft Windows

3.1, 95 or 98. The demo software requires that the PC printer

port be connected to CN3 of the DEM-DAI1604 using a

standard printer cable.

The Window menu includes four selections: Attenuation,

Operational Control, Function Control, and Register Read.

The following sections provide an explanation of each

window.

Installation

The demo software is distributed on a 3.5 inch floppy disk.

On the disk, there is a single folder named “Dem1604.”

This folder contains the application and all support files.

To install the software on your computer, first create a new

folder on your hard drive with an appropriate name (e.g.,

DEM1604, PCM1604, etc.). Then open the “Dem1604”

folder on the installation floppy and copy all the files in it to

your new folder.

HOLD and PASS

Each window has a button near the top. It’s labeled either

HOLD or PASS. The current setting is toggled by clicking on

the button. When set to HOLD, the settings in a window can

be changed, but they will not be written to the register(s) until

the OK button (which appears at the bottom of the window)

is pressed. When set to PASS, setting changes made in a

window are immediately written to the corresponding

register(s).

Open the configuration settings file named “Dem1604” with

a text editor, such as Notepad. When the file is opened, find

the following line:

PCMIFADR = &h378

The &h378 indicates the printer port address that the demo

software will use to communicate with the DEM-DAI1604.

This address must be set to &h378, &h278, or &h3BC. Most

PCs use &H378 as the default printer port address. If your

printer port is not located at &h378, edit the address to match

your computer’s port address.

Attenuation Window

TheAttenuation window is used to set the digital attenuation

registers internal to the PCM1604 and is shown in Figure 6.

There is an attenuator for each of the six output channels,

and each attenuator has its own independent register to

control its attenuation level. In the Attenuation window,

there is a slider for each attenuator register. Use the slider

handle or the arrows at each end of the slider to adjust the

attenuation level. The left and right arrow keys on the

keyboard can also be used to adjust the level. To the right of

each slider is a status display showing the current register

setting (in decimal) and the corresponding attenuation level

in decibels (dB) relative to the input signal level.

Using the Demo Software

Double click on the application file named “Dem1604.”

A window will appear on your screen, as shown in Figure 5.

There are two menus near the top of the window, named

Execute and Window.

FIGURE 5. Start Up Window.

FIGURE 6. Attenuation Window.

®

8

DEM-DAI1604

Although the Attenuation window is used to set the level of

the attenuation registers, the actual attenuators inside the

PCM1604 will not be updated unless the attenuation load

control, ATLD (in the Operational Control window) is set to

LOAD. While ATLD is set to OFF, the attenuation registers

are written to, but the attenuators are not updated. When

ATLD is switched from OFF to LOAD, all attenuators will

be updated simultaneously.

Register Read Window

The PCM1604 serial control interface includes register read

capability. The Register Read window (or panel) allows the

user to read the value of all PCM1604 registers by pressing

a single button. The panel is shown in Figure 9. The Register

Read panel provides a means to check for proper communi-

cations between the PC printer port and the DEM-DAI1604

by allowing the user to verify register write operations.

Operational Control Window

The Operational Control window (labeled DAC Operation)

is used to program the soft mute (MUT1-6), DAC operation

(DAC1-6), attenuation load (ATLD), attenuation rate (ATTS),

and infinite zero detect mute (IZD) functions. The mute,

DAC operation, and infinite zero mute functions are set

using check boxes, as shown in Figure 7. The labels associ-

ated with the check boxes change from ON to OFF as the

settings are toggled. The attenuation load and rate functions

utilize pull-down menus to set ATLD to Disable or Enable,

and ATTS to 2/f_Sor 4/f_S.

For more information regarding these functions, please refer

to the PCM1604 Product Data Sheet.

FIGURE 8. Function Control Window.

FIGURE 7. Operational Control Window.

Function Control Window

The Function window hosts the remainder of the PCM1604

control functions. All functions are programmed using pull-

down menus, as shown in Figure 8. Functions that can be

programmed by this window include:

•

SCLKO Output Enable (CLKE) and Rate (CLKD) Controls

• De-Emphasis Controls (DM12, DM34, DM56) and Sample

Rate Selection (DEM)

• Audio Data Format (I/F FORMAT)

• Digital Filter Roll-Off (ROLL-OFF)

• Output Phase (Normal or Inverted)

• Oversampling (64fs or 128fs)

FIGURE 9. Register Read Window.

These functions are described in detail in the PCM1604

Product Data Sheet.

®

9

DEM-DAI1604

GPO CONTROL WINDOW

The GPO Control window provides a simple interface for

utilizing the PCM1604’s GPO function. Figure 10 shows the

default setting of the GPO Control window, where the

ZERO1 through ZERO6 output pins are used as zero flags.

Figure 11 shows the alternate function, where ZERO1 through

ZERO6 are configured as general-purpose logic outputs

GPO1 through GPO6. Check boxes are used to set the

outputs to the ON (logic 1) or OFF (logic 0) states.

The PCM1604 allows the user to select the function of the

ZERO1 through ZERO6 output pins. By default, these pins

operate as zero flag outputs for VOUT1 through VOUT6

respectively. Control Register 11 allows the user to select an

alternate function for these pins. The ZERO1 through

ZERO6 pins may be used as general-purpose outputs, or

GPO1 through GPO6. When configured as GPO pins, Con-

trol Register 12 is utilized to set the output logic level for

each pin.

The GPO capability is useful for controlling external mute

switches, or other digitally-controlled analog circuit functions.

FIGURE 11. GPO Control Window, General Purpose Out-

puts Enabled.

FIGURE 10. GPO Control Window, Zero Flags Enabled

(Default).

.

®

10

DEM-DAI1604

IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue

any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

Customers are responsible for their applications using TI components.

In order to minimize risks associated with the customer’s applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent

that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other

intellectual property right of TI covering or relating to any combination, machine, or process in which such

semiconductor products or services might be or are used. TI’s publication of information regarding any third

party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.


型号：	SBAU012
厂家：	TEXAS INSTRUMENTS
描述：	COMPLETE EVALUATION PLATFORM FOR THE PCM1604 SIX-CHANNEL AUDIO D/A CONVERTER 完整的评估平台，为PCM1604 6声道音频D / A转换器转换器 PC
文件：	总11页 (文件大小：157K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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