filter. It includes a demonstration board, PC interface
cable, and software for controlling the DF1704 filter.
The demonstration board includes all necessary power
supply and interface connectors. A socket is provided
for accommodating the DEM-DIR1700 demo board.
Analog signal conditioning circuitry for the DAC
outputs is also included.
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
This section describes the hardware components of the
DEM-PCM1704 demonstration board.
DAC SECTION
The DAC section of the demonstration board includes two
PCM1704Us, two OPA627s used as current-to-voltage (I/V)
converters, and a OPA2134 dual op amp used to provide
second-order lowpass filters for the right and left audio
channels. Connectors are provided for power supplies and
interfacing to the digital section or an external digital host.
Connectors
Connector CN1 is used to provide power to the PCM1704
DACs. +V
CC
should be set for +5V
DC
, and –V
CC
should be
set for –5V
DC
.
Connector CN2 is used to provide power to the OPA627 and
OPA2134 op amps. +V
A
is typically set for +15V
DC
(maxi-
mum is +18V
DC
), while –V
CC
is typically set to –15V
DC
(maximum is –18V
DC
).
The GND pins on connectors CN1 and CN2 are connected
to the analog ground plane of the DAC section.
CN3 is used to connect the audio interface of the digital
section to the PCM1704 DACs. Normally, jumpers should
be installed for BCK, WDCK, DOL, DOR, and GND.
However, if the user desires to bypass the circuitry of the
digital section and drive the DACs directly from another
signal source, this can be accomplished through this connec-
tor.
RCA jacks PJ1 and PJ2 provide the left and right audio
channel outputs. They provide straight forward connection
to measurement and commercial audio equipment.
Switches
DIP switch SW0 is used to set up the data format for the two
PCM1704 DACs. Table I shows the function of the DIP
switch settings.
SW0
20-BIT
INVL
INVR
FUNCTION
Selects Data Word Length
Selects Phase for Left Channel DAC
Selects Phase for Right Channel DAC
SETTINGS
H = 24 Bits, L = 20 Bits
H = Normal, L = Inverted
H = Normal, L = Inverted
TABLE I. DAC Data Format Configuration.
DIGITAL SECTION
The digital section of the DEM-PCM1704 demonstration
board includes the DF1704 digital filter, DIP switches for
configuring the filter, a connector for the PC interface cable
and digital power supply, and a header for the input data
interface. A socket is provided for the DEM-DIR1700
digital audio receiver adaptor board so that clocks and data
can be derived from a standard S/PDIF input source.
Connectors
Connector CND1 is used to provide the +5V digital power
supply and ground connections. It is also used to provide
connection with an external host when using the DF1704
digital filter in Software control mode. The PC interface
cable which accompanies the DEM-PCM1704 kit can be
used to provide the connection with a PC parallel (or printer)
port to control the MC, MD, ML, and RST signals. The
cable also includes two banana plugs for connection to an
external +5V supply.
Connector CND2 is used to provide the audio input data
interface. CND2 can be connected to an external source, or
®
DEM-PCM1704
2
it can be configured to function with the DEM-DIR1700
adaptor board, which plugs into socket UD2. The DEM-
DIR1700 adaptor board includes Burr-Brown’s DIR1700
digital audio receiver. This module can be used to connect to
an S/PDIF or optical audio interface used by measurement
and commercial audio equipment, such as CD and DVD
players.
Switches
DIP switches SW1 and SW2 are used to set the configura-
tion of the DF1704 digital filter. The DF1704 can be con-
trolled using Hardware or Software modes, which is deter-
mined by the logic state of the MODE switch.
Table II shows the operation of DIP switch SW1.
SW1
ML (RESV)
DESCRIPTION
Software Mode: Control Port Word Clock Signal—set
switch to H
Hardware Mode: Reserved, Not Used
Software Mode: Control Port Bit Clock—set switch to H
Hardware Mode: LRCIN Polarity
LRIP = H, then H = Left Channel, L = Right Channel
LRIP = L, then H = Right Channel, L = Left Channel
Software Mode: Control Port Data—set switch to H
Hardware Mode: CLKO Output Frequency
CKO = H, then CLKO frequency = XTI/2
CKO = L, then CLKO frequency = XTI
Reset: H = Normal Operation; L = Reset Operation
Mode Control: H = Software Mode, L = Hardware Mode
Mute Control (ignored in Software mode)
H = Mute Off—Normal Operation; L = Mute On
Table III shows the operation of DIP switch SW2 in Hard-
ware mode. SW2 settings are ignored in Software mode.
SW2
I
2
S
IW0
IW1
I
2
S
L
L
L
L
H
H
IW1
L
L
H
H
L
L
IW0
L
H
L
H
L
H
INPUT FORMAT
16-Bit, Standard, MSB-First, Right-Justified
20-Bit, Standard, MSB-First, Right-Justified
24-Bit, Standard, MSB-First, Right-Justified
24-Bit, MS-First, Right-Justified
16-Bit, I
2
S
24-Bit, I
2
S
DESCRIPTION
Input Data Format Controls
SRO
OW0
OW1
Digital Filter Roll-Off: H = Slow, L = Sharp
Output Data Format Controls
OW1 OW0 OUTPUT FORMAT
L
L 16-Bit, MSB-First
L
H 18-Bit, MSB-First
H
L 20-Bit, MSB-First
H
H 24-Bit, MSB-First
Sample Rate Selection for De-Emphasis Control
SF1
L
L
H
H
SF0
L
H
L
H
SAMPLING RATE
44.1kHz
Reserved
48kHz
32kHz
SF0
SF1
MC (LRIP)
MD (CKO)
DEM
Digital De-Emphasis: H = On, L = Off
TABLE III. SW2 Operation (Hardware mode only).
SCHEMATICS
Figure 1 shows the circuit connections for the digital section
of the demonstration board. Figure 2 shows the circuit
diagram for the DAC Section of the demonstration board.
RST
MODE
MUTE
TABLE II. SW1 Operation (Hardware mode descriptions of
dual mode pins shown in parentheses).
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.
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