ETC DEM-DAI1737/DEM

®
DEM-DAI1737
DEM-DAI1739
EVALUATION FIXTURE
INSTRUCTION MANUAL
FEATURES
● POWER SUPPLY REQUIREMENTS:
● SOCKET ACCEPTS EITHER PCM1737 OR
+5V, +15V, and –15V
PCM1739
● CONNECTOR FOR OPTIONAL EXTERNAL
● ON-BOARD LOW-PASS FILTERS FOR LEFT
+3.3V POWER SUPPLY
AND RIGHT CHANNELS
● EASY CONFIGURATION USING ON-BOARD
SWITCHES AND JUMPERS
● 96kHz DIGITAL AUDIO RECEIVER ACCEPTS
S/PDIF AND OPTICAL INPUTS
DESCRIPTION
● DEMONSTRATION SOFTWARE FOR PRO-
The DEM-DAI1737/1739 is a complete evaluation
platform for the PCM1737 and PCM1739 24-bit stereo, audio digital-to-analog converters. All necessary
connectors are provided for interfacing to audio test
systems and commerical audio equipment.
GRAMMING AND READING THE PCM1737’s
INTERNAL REGISTERS (requires a PC running
Microsoft Windows® 3.1, 95, or 98)
● CENTRONICS CONNECTOR FOR INTERFACING
TO A PC PARALLEL PORT (required for the
demonstration software)
BLOCK DIAGRAM
ML
MC
MDI RST MDO
GND +VDD
GND
3.3V
Regulator
SW101
Opt
Coax
JP001
Digital
Audio
Receiver
and
Logic
SCKI
CLKO
BCK
BCK (Left Jus)
LRCK
DATA
PCM1737
PCM1739
D/A
Converter
L/R Ch
VCC AVCC– GND AVCC+
VCC
2nd-Order LPF
OPA2134
VOUTL
VOUTR
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
®
© 1999 Burr-Brown Corporation
LI-541
1
Printed in U.S.A. November, 1999
DEM-DAI1737/1739
HARDWARE DESCRIPTION
DIGITAL AUDIO INTERFACE
A digital audio receiver (U002) is provided for easy connection to S/PDIF and optical signal sources, including audio
test systems (Audio Precision, Rhode & Schwarz) and commercial audio equipment (CD and DVD players). The receiver can operate up to a 96kHz word rate with 24-bit data.
Switches SW001 through SW003 are used to set the receiver
output data format, as shown in Table I. Table II shows the
jumper configuration for JP001 when using the digital audio
receiver.
POWER SUPPLIES
The evaluation fixture requires three power supplies for
operating the PCM1737 or PCM1739, digital support circuitry, and the low pass filter op amp. These supplies are
connected to vertical header CN051.
VCC is the +5V power supply. It is used to power the analog
sections of the PCM1737 or PCM1739, as well as the digital
audio receiver (U002) and associated logic (U003 and U004).
AVCC+ and AVCC– are used to power the Burr-Brown
OPA2134 dual op amp (U201), which performs the D/A
output low pass filter function. AVCC+ may be set from
+5V to +18V, while AVCC– may be set from –5V to –18V.
In addition to the three required external power supplies, a
+3.3V supply is required for the PCM1737 or PCM1739.
The +3.3V supply is typically derived from VCC using an
on-board linear regulator, Burr-Brown’s REG1117-3.3
(U051). A jumper must be installed at CN053 to connect the
regulator output to the PCM1737 or PCM1739.
A connector (CN052) is provided for connection to an
optional external +3.3V power supply. When using CN052,
the jumper at CN053 must be removed in order to disable
the regulator output.
SW001
SW002
SW003
L
L
H
L
L
H
L
H
L
L
H
H
RECEIVER OUTPUT DATA FORMAT
16- to 24-Bit, Left-Justified
16- to 24-Bit, I2S
16-Bit, Right-Justified (or Standard)
18-Bit, Right-Justified (or Standard)
TABLE I. Digital Audio Receiver Configuration.
16-BIT
18-BIT
16- TO 24-BIT 16- TO 24-BIT
LEFT-JUSTIFIED
RIGHT-JUSTIFIED RIGHT-JUSTIFIED
I2S
FORMAT
FORMAT
FORMAT
FORMAT
JP001
JUMPER
SCKI
BCK (Left Jus)
BCK
LRCK
DATA
CLKO
GND
ANALOG OUTPUTS
The Left and Right audio outputs are available at RCA jacks
CN201 and CN202 respectively. The outputs are taken from
the low pass filter, which has a gain of 2. The low-pass filter
may be configured for one of two cut-off frequencies:
54kHz or 108kHz.
O
NC
O
O
O
X
O
O
NC
O
O
O
X
O
O
NC
O
O
O
X
O
O
O
O
O
O
X
O
O = Install Jumper; NC = Remove Jumper, X = Don't Care.
TABLE II. JP001 Jumper Configuration for Use with the
Digital Audio Receiver.
Switch SW004 is a normally open, momentary contact
pushbutton switch used to reset the digital audio receiver
when necessary.
In addition to the digital audio receiver, the evaluation
fixture may be interfaced to an external audio DSP, decoder,
or alternative signal source through connector JP001 using
standard ribbon cable connections.
For f–3dB = 54kHz, jumpers JP201 through JP206 must all be
installed.
For f–3dB = 108kHz, jumpers JP201 through JP206 must all
be removed.
ZERO FLAG OUTPUTS
The zero flags for the Left and Right channels are brought
out on connector CN101. ZFGL is the zero flag for the Left
channel, while ZFGR is the zero flag for the right channel.
The zero flags are normally Low, but will switch to a High
state when 1024 consecutive sample periods (or LRCK
periods) have passed with all 0’s data on the DIN (or
DATA) input. These flags may be used to control external
mute circuitry, or as status indicators for a microcontroller,
audio DSP/decoder, or other digitally controlled functions.
DIP SWITCH CONFIGURATION—PCM1737
DIP switch SW101 is used primarily for configuration of the
PCM1739. When using the PCM1737, the switches should
be set as follows:
FILT = L
MUTE = L
IBIT
1739
=L
=L
RSTB = H
DEM0 = H
DEM1 = H
FORM = H
RSTB may be used to force an external reset of the
PCM1737. This is done by setting RSTB = L, followed by
setting RSTB = H.
®
DEM-DAI1737/1739
2
DIP SWITCH CONFIGURATION—PCM1739
PC PARALLEL PORT/HOST CONNECTOR
When using the PCM1739, the 1739 switch of SW101 must
be set to the ‘H’ position.
SW101 is used to set the configuration of the PCM1739’s
mode controls. Table III shows the available settings for
SW101.
The evaluation fixture includes a Centronics connector,
CN102, which is used to connect to a PC parallel (or printer)
port, or an alternative host controller. This connector is
utilized to access the serial control port of the PCM1737.
The serial control port is used to program and read the
PCM1737’s internal registers.
A standard printer cable is used to connect CN102 of the
evaluation fixture to a PC parallel port.
SW101
SWITCH(s)
SETTING
FUNCTION
FILT
L
H
8x Oversampling (used for fS up to 96kHz
4x Oversampling (used for fS > 96kHz)
MUTE
L
H
Mute Disabled, Normal Operation
Mute Enabled, Outputs Forced to Bipolar Zero
IBIT
L
H
24-Bit Audio Data Word Length
16-Bit Audio Data Word Length
RSTB
L
H
Reset Mode, Outputs Forced to Bipolar Zero
Normal Operation
DEM0
Digital De-Emphasis
DEM1
DEM1 DEM0
L
L
L
H
H
L
H
H
FORM
L
H
SCHEMATICS
Figures 1 through 4 provide schematics for the DEMDAI1737/1739.
PCB LAYOUT
Figures 4 through 6 provide PCB plots for the DEMDAI1737/1739.
Selection
De-Emphasis Disabled
32kHz De-Emphasis Filter
44.1kHz De-Emphasis Filter
48kHz De-Emphasis Filter
Standard, Right-Justified Data Format
I2S Data Format
TABLE III. PCM1739 Mode Control Settings.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
3
DEM-DAI1737/1739
3
VCC
C004
0.1µF
4
C001
0.01µF
C002
0.01µF
C006
0.1µF
+ C005
10µF
VCC
M2
M1
M0
M3
14
13
12
11
10
9
8
7
6
5
4
3
2
1
SEL
M1
12
M2
4
13
M3
M2
M0
M1
M0
SW001
U003
HC14
15
SW002
U003
HC14
CBL
16
17
18
19
20
21
22
23
24
25
26
27
28
SW003
13
12
1
2
4
5
10
9
U004
HC32
+VCC
11
3
6
8
U
CS12/FCK
M3
RXN
SCK
RXP
M2
FILT
MCK
DGND
FSYNC
VA+
AGND
VD+
M0
C0/E0
Cb/E2
M1
ERF
Cc/F0
Ca/E1
Ca/F2
SDATA
Cd/F1
VERF
C
3
U101
CS8414
C012
10µF
VCC
+
VCC
C008
0.1µF
CN002
+
VCC
R004
470Ω
LRCK
BCK
1
19
BCK
LRCK
DATA
1
SCKI
X
MDI
JP2
RST
MC
4
6
24
IBIT
VDD
1739
8
26
7
25
10
28
+
C104
10µF
C103 +
10µF
C11
10µF
9
27
+
14
13
12
11
10
9
8
7
1
ZEROR
ZEROL
RSTB
NC(3)
NC(2)
VCCL
GNDL
SCLK
VSS
VDD
TEST1
TEST2(1)
VCCR
GNDR
VOUTL
VCCA
VOUTR
GNDA
EXTL
MDO(4)
CLKO
EXTR
MDI(5)
BCLK
ML(7)
MC(6)
DATA
LRCK
PCM1737
OE1
2A1 11
1Y4 12
2A2 13
1Y3 14
2A3 15
1Y2 16
2A4 17
1Y1 18
15
33
NOTES: For PCM1739, these pins become:
(1) IBIT
(2) FILT
(3) MUTE
(4) NC
(5) DEM0
(6) DEM1
(7) FORM
C11
10µF
6
5
4
3
2
1
OE2
8 1A4
9 2Y1
6 1A3
7 2Y2
4 1A2
5 2Y3
19
11
29
MDO
4
22
5
23
3
12
30
13
31
2 1A1
3 2Y4
15
16
17
18
19
20
21
22
23
24
25
26
27
28
18
36
ML
3
21
2
14
32
U102
VHC244
16
34
17
35
RSTB
2
20
ML
BCK (left-justified)
BCK (left-justified)
SCKI
DATA
SW004
PUSHSW
D001
1S1500
C009
0.068µF
R002
470Ω
C007
10µF
R003
47kΩ
RA101
47kΩ
VDD
MC
CN102
MDI
C108
0.1µF
C104
+ 10µF
+ C103
10µF
+ C
108
10µF
ZFGL
ZFGR
CN101
MDO
MDI
MC
ML
VERF ERF
FIGURE 1. DAC, Digital Audio Interface, and I/O Connections.
R001
75Ω
CN001 COAX
+ C003
10µF
TORX176
1
U001
2
4
5
6
MDO
RSTB
DEM-DAI1737/1739
+
®
VOUTR
VCC
VOUTL
IBIT
1739
SW101
VDD
4
3
2
1
R205
15kΩ
C209
120pF
JP203
C201
10µF/16V
VOUTL
R201
8.2kΩ
JP201
C207
120pF
R203
1kΩ
R207
100Ω
2
+
3
C203
1200pF
JP205
C205
1200pF
1/2
OPA2134A
4
1
CN201
RCA
U201
AVCC+
R206
15kΩ
C210
120pF
JP204
C202
10µF/16V
VOUTR
R202
8.2kΩ
JP202
C211
10µF/16V
+
C212
10µF/16V
AVCC–
JP206
C208
120pF
R204
1kΩ
6
+
5
C204
1200pF
+
8
1/2
OPA2134A
7
R208
100Ω
CN202
RCA
U201
C206
1200pF
FIGURE 2. DAC Low-Pass Filters.
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5
DEM-DAI1737/1739
VDD
VCC
GND
U051
REG1117-3.3
CN052
1
GND
GND
AVCC–
AVCC+
5
3
1
CN1
Out GND IN
1
2
2
3
4
2
GND
3.3V
VDD
VCC
C056
10µF
CN053
+ C055
0.1µF
+
+
C90
0.1µF
GND
VDD
C89
100µF
C92
100µF
+
VCC
C109
0.1µF
For U102
C93
100µF
C010
0.1µF
VCC AVCC–
C011
0.1µF
GND
For U003, U004
FIGURE 3. Power Supply Connections.
FIGURE 4. Silk Screen (top side).
®
DEM-DAI1737/1739
+
6
AVCC+
GND
FIGURE 5. Top Side Layer.
FIGURE 6. Bottom Side Layer.
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DEM-DAI1737/1739
PCM1737 DEMONSTRATION
SOFTWARE
The Execute menu includes three selections: Initialize, Reset, and Exit. Selecting Initialize will instruct the program to
write all of the PCM1737’s internal registers with the
default values. Selecting Reset will instruct the program to
re-write the PCM1737’s internal registers with the data
currently selected in the application windows. Selecting
Exit will close the application.
Software is provided with the DEM-DAI1737/1739 to allow
programming of the PCM1737’s internal registers. The
software will operate on computers running Microsoft Windows 3.1, 95, or 98. The demo software requires that the PC
printer port be connected to CN102 of the DEM-DAI1737/
1739 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.
HOLD and PASS
INSTALLATION
The demo software is distributed on a 3.5-inch floppy disk.
There is a single folder on the disk, named “Dem1737”. 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.,
Dem1737, Pcm1737, etc). Then open the “Dem1737” folder
on the installation floppy and copy all of the files in it to your
new folder.
Each window has a button near the top. It’s labeled either
HOLD or PASS. The setting is toggled by clicking on this
button. When set to HOLD, the user can change the settings
in a window but they will not be written to the register(s)
until the OK button (which appears at the bottom left corner
of the window) is pressed. When set to PASS, changes made
within a window are immediately written to the corresponding register(s).
Attenuation Window
Open the configuration settings file named “Dem1737” with
a text editor, such as Notepad or WordPad. When the file is
opened, find the following line:
PCMIFADR = &h378
The Attenuation window is used to set the digital attenuation registers internal to the PCM1737 and is shown in
Figure 8. There is an attenuator for both the Left and Right
output channels, and each attenuator has its own independent register to control its 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. Just below
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.
The Attenuation window also includes the ATLD, or Attenuation Load Control. When ATLD is set to OFF, the
attenuator function is disabled. When ATLD is set to LOAD,
changes in slider settings will take effect immediately (if the
window is set to PASS), or when the OK button is clicked
(if the window is set to HOLD).
The &h378 indicates the printer port address that the demo
software will use to communicate with the DEM-DAI1737/
1739. This address must be set to &h378, &h278, or &h3BC.
Most PC’s use &H378 as the default printer port address. If
your printer port is not located at &h378, edit the address to
match your computers port address.
USING THE DEMO SOFTWARE
Double click on the application file named “dem1737”. A
window will appear on your screen, as shown in Figure 7
There are two menus near the top of the window, named
Execute and Window.
FIGURE 8. Attenuation Window.
FIGURE 7. Startup Window.
®
DEM-DAI1737/1739
8
The Attenuation window also includes the ATTS, or Attenuation Speed Control. ATTS is used to set the rate at which
the attenuator is stepped when a level change is made. The
speed is either 2/fS or 4/fS, where fS is the sampling frequency.
Operational Control Window
The Operational Control window is shown in Figure 9. This
window is used to set the following functions:
• Soft Mute (Mute Lch, Mute Rch): ON or OFF
• DAC Operation (DAC Lch, DAC Rch): ON or OFF
• Zero Detect Mute (IZD): ON or OFF
• Digital De-Emphasis (DEM): OFF, 32kHz, 44.1kHz, or
48kHz
For more information regarding these functions, refer to the
PCM1737 data sheet.
Function Control Window
FIGURE 9. Operational Window.
The Function Control window is shown in Figure 10. This
window is used to set the following functions:
• DAC Oversampling Rate (OVER): 64fs or 128fs
• Digital Interpolation Filter Rate (K192): 8x or 4x
• Digital Filter Low Pass Response (FLT): Sharp, Slow 1,
or Slow 2
• CLKO Enable (CLKE): ON or OFF
• CLKO Rate (CLKD): fSCLK (Normal) or fSCLK / 2 (1/2 XTI)
• Audio Data Format (Format)
For more information regarding these functions, refer to the
PCM1737 data sheet.
Register Read Window
The PCM1737 serial control interface includes register read
capability. The Register Read window allows the user to
read the value of all PCM1737 registers by pressing a single
button. The window is shown in Figure 11. The Register
Read window provides a means to check for proper communications between the PC printer port and the DEM-DAI1737/
1739, by allowing the user to verify register write operations.
FIGURE 10. Function Control Window.
FIGURE 11. Register Read Window.
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9
DEM-DAI1737/1739