LTC1655I Linear Technology, LTC1655I Datasheet - Page 9

• Manufacturer Part Number: LTC1655I
• Description: 16-Bit Rail-to-Rail Micropower DAC in SO-8 Package
• Manufacturer: Linear Technology

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
onboard 2.048V reference and R3 and R4. R5 ensures that
TYPICAL APPLICATIONS
– 4.096
4.096
V
OUT
0
TRANSFER CURVE
P
32768
U
65535
CLK
D
CS/LD
A Wide Swing, Bipolar Output 16-Bit DAC
IN
D
GND
IN
LTC1655
V
5V
CC
V
REF
R5
100k
1%
0.1 F
V
OUT
100k
1%
R3
the onboard reference is always sourcing current and
never has to sink any current even when V
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 = 125 V.
R1
100k
1%
R2
200k
1%
–
+
LT1077
– 5V
5V
200k
1%
R4
1655 TA05
V
OUT
:
(2)(D
65536
IN
)(4.096)
– 4.096V
LTC1655
OUT
is at full
9