DAC8822QB BURR-BROWN [Burr-Brown Corporation], DAC8822QB Datasheet - Page 17

• Manufacturer Part Number: DAC8822QB
• Description: 16-Bit, Dual, Parallel Input, Multiplying Digital-to-Analog Converter
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

BIPOLAR OUTPUT CIRCUIT
The DAC8822, as a 4-quadrant multiplying DAC, can be used to generate a bipolar output. The polarity of the
full-scale output (I
Using a dual op amp, such as the OPA2277, full 4-quadrant operation can be achieved with minimal
components.
shown in
V
OUT
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+
RSTSEL
LDAC
D15
WR
RS
32768
D0
A0
Equation
A1
D
Figure 43
*1
DAC8822
OUT
DGND
Interface
Parallel
2:
Bus
) is the inverse of the input reference voltage at V
V
demonstrates a 10V
REF
V
DD
V
Figure 43. Bipolar Output Circuit for Channel A
REF
APPLICATION INFORMATION (continued)
R
Register
Input A
Control
1
Logic
A
R
R
1
COM
A
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A
OPA2277
OUT
R
Register
DAC A
2
V
A
circuit with a fixed +10V reference. The output voltage is
REF
U1
A
R
OFS
A
R
OFS
DAC A
A
REF
R
R
FB
SBAS390A – DECEMBER 2006 – REVISED MARCH 2007
FB
A
.
A
AGNDA
I
OUT
A
C
1
OPA2277
U2
DAC8822
V
OUT
(2)
17