LTC1654
U
TYPICAL APPLICATIO S
ThiscircuitshowshowtouseanLTC1654andanLT®1077
to make a wide bipolar output swing 14-bit DAC with an
offset that can be digitally programmed. VOUTA, which can
be set by loading the appropriate 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 14-Bit DAC with Digitally Controlled Offset
5V
0.1µF
LTC1654
B
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
X /X
1
V
1/2
CC
CLR
SCK
SDI
V
OUT B
49.9k
1%
15V
LT1077
–15V
REFHI B
REFLO B
AGND
µP
+
–
V
OUT
OUTB
CS/LD
DGND
SDO
100k
1%
2 (V
– V
)
OUTA
REFLO A
REFHI A
X /X
1
A
V
OUT A
1/2
1654 TA02
49.9k
1%
100k
1%
10
5
V
≅ 0V
OUTA
V
≅ 2.5V
OUTA
0
CODE
16383
V
OUTA
≅ 5V
–5
–10
1654 TA03
1654fb
13
Linear [ Linear ]
