LTC1446/LTC1446L
TYPICAL APPLICATIONS
N
This circuit shows how to use an LTC1446 and an
LT
®
1077 to make a wide bipolar output swing 12-bit DAC
with an offset that can be digitally programmed. V
OUT A
,
which can be set by loading the appropriate digital code
for DAC A, sets the offset. As this value changes, the
transfer curve for the output moves up and down as
illustrated in the graph below.
A Wide Swing, Bipolar Output DAC with Digitally Controlled Offset
5V
µP
CS/LD
V
OUT
4.094
U
0.1µF
CLK
V
OUT B
50k
D
IN
LTC1446
GND
100k
V
CC
15V
+
LT1077
V
OUT
=
2 (V
OUT B
– V
OUT A)
–
–15V
50k
100k
D
OUT
V
OUT A
8.190
A
B
0
C
–4.096
A: V
OUT A
≅
0V
B: V
OUT A
≅
2.048V
C: V
OUT A
≅
4.095V
D
IN
–8.190
1446/46L F02
9
LINER [ LINEAR TECHNOLOGY ]
