PCM67 Burr-Brown Corporation, PCM67 Datasheet - Page 8

• Manufacturer Part Number: PCM67
• Description: Advanced 1-Bit BiCMOS Dual 18-Bit DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: Burr-Brown Corporation

INSTALLATION
POWER SUPPLIES
Refer to “Pin Configuration” diagram for proper connection
of the PCM67/69A. The PCM67/69A requires only a +5V
supply. Both analog and digital supplies should be tied to-
gether at a single point, as no real advantage is gained by using
separate supplies. It is more important that both these supplies
be as “clean” as possible to reduce coupling of supply noise to
the output.
FILTER CAPACITOR REQUIREMENTS
As shown in the “Pin Configuration” diagram, various sizes of
decoupling capacitors can be used with no special tolerances
required. All capacitors should be as close to the appropriate
pins of the PCM67/69A as possible to reduce noise pickup
from surrounding circuitry.
A power supply decoupling capacitor should be used near the
analog supply pin to maximize power supply rejection, as
shown in Figure 6, regardless of how good the supplies are.
Both commons should be connected to an analog ground
plane as close to the PCM67/69A as possible.
The value of these capacitors is influenced by actual board
layout design and noise from power supplies and other digital
input lines.
The best suitable value for the capacitors should be deter-
mined by the user’s actual application board.
FIGURE 6. Shift of I/V Out Voltage.
V
(3.5V)
V
COM
I
COM
OUT
+V
CC
+
V
2
O
(+3.5V)
V
R
COM
In case of shift to 3V swing, 0V center
–FSR±(V
V
Offset Current I
Offset Resistor R
®
OS
SHT
R
V
I
R
OS
PCM67/69A
NF
SHT
OS
is given by
=
=
=
= V
S
1.2mA
I
) = –3V after offset addition, shift voltage
V
V
R
OS
V
SHT
CC
COM
OUT
NF
I
– V
OS
OS
+ 3V = 3.5 + 3 = 6.5V
OS
=
V
is given by
=
V
COM
SHT
O
is given by
6.5V
1.2mA
5k
6V
=
5 – 3.5V
= 1.3mA
1.3mA
= 5k
or 0V
V
2
CC
R
NF
V
= 1.15k
S
V
V
OUT
O
8
TABLE III. Interface Control Function of SOIC.
PCM67P and PCM69AP (DIP package) have only 18-bit
L/R serial input function as shown in Table 4.
SHIFT OF I/V OUT VOLTAGE
If the user requires a bipolar voltage output centered around
0V or one-half of V
offset current on the inverting point of the I/V op amp as
shown in Figure 6.
FIGURE 7. Useful Application Circuit for Shift of I/V Out
INTERFACE CONTROL FUNCTION
Both the PCM67 and PCM69A (SOIC package type) are
capable of 16-bit L/R serial input and 20-bit L/R parallel input
as shown in Table 3.
TABLE IV. Interface Control Function of DIP.
NOTE: (1) Data input to Data-Lch (Pin 17) for L/R serial format.
MC1
10 F ~ 100 F
10 F ~ 100 F
0
0
0
0
1
1
1
1
MC1
0
0
1
V
(+5V)
Note: R
on +V
+V
I
COM
OUT
CC
MC2
0
0
1
1
0
0
1
1
CC
1
DATA-R
power supply line.
and C
Voltage.
X
0
1
MC3
+
+
1
1
1
1
1
0
1
0
1
C
C
are noise de-coupling circuits from noise
1
2
CC
INPUT FORMAT
18-Bit L/R Serial
18-Bit L/R Serial
18-Bit L/R Parallel
DATA-R
, the output can be shifted by adding an
R
820
R
330
0
1
0
1
X
X
X
X
1
2
INPUT FORMAT
16-Bit L/R Serial
16-Bit L/R Serial
18-Bit L/R Serial
18-Bit L/R Serial
20-Bit L/R Parallel
20-Bit L/R Parallel
18-Bit L/R Parallel
18-Bit L/R Parallel
0V
5k
R
NF
L
L
R
R
(1)
(1)
(1)
(1)
L R
L R
[WDCK Invert]
[WDCK Invert]
L
L
L
L
R
R
R
WDCK
WDCK
R
L R
L R
L R
L R
6V
WDCK
WDCK
WDCK
WDCK
V
OUT