LTC1655/LTC1655L
U
TYPICAL APPLICATIONS
the onboard reference is always sourcing current and
never has to sink any current even when VOUT is at full
scale. The LT1077 output will have a wide bipolar output
swing of –4.096V to 4.096V as shown in the figure below.
With this output swing 1LSB = 125µV.
This circuit shows how to make a bipolar output 16-bit
DAC with a wide output swing using an LTC1655 and an
LT1077. R1 and R2 resistively divide down the LTC1655
output and an offset is summed in using the LTC1655
onboard2.048VreferenceandR3andR4. R5ensuresthat
A Wide Swing, Bipolar Output 16-Bit DAC
5V
0.1µF
8
V
CC
1
2
3
CLK
7
µP
V
LTC1655
D
OUT
IN
R1
5V
CS/LD
100k
GND
5
V
REF
6
1%
3
2
7
LT1077
4
+
–
6
(2)(D )(4.096)
IN
R2
200k
1%
V
:
– 4.096V
OUT
TRANSFER CURVE
32768
65536
4.096
R3
100k
1%
R4
200k
1%
–5V
65535
0
1655/55L TA05
V
D
IN
OUT
R5
100k
1%
–4.096
12
Linear [ Linear ]
