DAC80 Burr-Brown Corporation, DAC80 Datasheet - Page 9

• Manufacturer Part Number: DAC80
• Description: Monolithic 12-Bit DIGITAL-TO-ANALOG CONVERTERS
• Manufacturer: Burr-Brown Corporation

Driving a Resistive Load Unipolar
A load resistance, R
Figure 11 will generate a voltage range, V
by:
FIGURE 11. Current Output Model Equivalent Circuit
The unipolar output impedance R
R
connecting pin 15 to 20 and pin 18 to 19). By choosing R
= 210 , R
load. This gives an output range of 0 to –2V. Since R
exact, initial trimming per Figure 3 may be necessary; also
R
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.
LI
LS
may be trimmed.
is the internal load resistance of 968
V
Current Controlled
by Digital Input
L
= 1178 . R
OUT
–2mA
0 to
Connected for Unipolar Voltage Output with
Resistive Load.
= –2mA [(R
L
R
= R
L
O
in parallel with R
LI
L
+ R
R
x R
21
LI
LS
O
O
, connected as shown in
)
18
equals 6.6k
15
Common
(R
L
O
+ R
yields 1k total
OUT
R
LS
O
, determined
)]
(derived by
V
(typ) and
OUT
+
–
O
is not
LS
9
Driving a Resistive Load Bipolar
The equivalent output circuit for a bipolar output voltage
range is shown in Figure 12, R
determined by:
By connecting pin 17 to 15, the output current becomes
bipolar ( 1mA) and the output impedance R
3.2k (6.6k in parallel with 6.3k ). R
by connecting pin 15 to 18 and pin 18 to 19). By choosing
R
total load. This gives an output range of 1V. As indicated
above, trimming may be necessary.
FIGURE 12. Current Output Model Connected for Bipolar
LS
= 225 , R
Current Controlled
by Digital Input
V
OUT
+1mA
Output Voltage with Resistive Load.
L
= 1mA [(R
= 1455 . R
R
O
DAC80/80P
L
O
R
in parallel with R
21
LI
x R
L
20
L
)
15
Common
= R
(R
LI
O
LI
is 1200 (derived
+ R
R
+ R
LS
L
O
)]
LS
O
V
yields 1k
OUT
. V
becomes
+
–
OUT
is
®