Datasheet

V
REF
H
V
REF
H
+6V
±5V
-6V
OPA703
DAC7565
10 Fm 0.1 Fm
R
1
10kW
R
2
10kW
3-Wire
SerialInterface
V
OUT
GND
AV
DD
AV
DD
V L
REF
V =
O
- ´V
REF
D
4096
V
REF
´ ´
R +R
1 2
R
1
R
2
R
1
V =
O
- 5V
10 D´
4096
+6V
±2.5V
-6V
OPA703
DAC7565
150nF
R
1
10kW
R
2
10kW
3-Wire
SerialInterface
V
OUT
GND
AV
DD
AV
DD
V
REF
H
V L
REF
DAC7565
SBAS412B –FEBRUARY 2008–REVISED MARCH 2011 www.ti.com
BIPOLAR OPERATION USING THE DAC7565
The DAC7565 is designed for single-supply
operation, but a bipolar output range is also possible
using the circuit in either Figure 99 or Figure 100.
The circuit shown gives an output voltage range of
±V
REF
. Rail-to-rail operation at the amplifier output is
achievable using an OPA703 as the output amplifier.
The output voltage for any input code can be
calculated with Equation 4:
Figure 99. Bipolar Output Range Using External
(4)
Reference at 5V
where D represents the input code in decimal
(0–4095).
With V
REF
H = 5V, R
1
= R
2
= 10kΩ.
(5)
This result has an output voltage range of ±5V with
0000h corresponding to a –5V output and 0FFFh
corresponding to a +5V output, as shown in
Figure 99. Similarly, using the internal reference, a
±2.5V output voltage range can be achieved, as
Figure 100 shows.
Figure 100. Bipolar Output Range Using Internal
Reference
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