Datasheet

11
LTC1451
LTC1452/LTC1453
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
SA
O
PP
L
IC
AT
ITY
P
I
CA
L
A Wide Swing, Bipolar Output 12-Bit DAC
CLK
D
IN

CS/LD
µP
0.1µF
V
CC
V
OUT
GND V
REF
R1
5k
5V
LTC1451
1451/2/3 TA06
–
+
LT1077
5V
–5V
R2
10k
R3
10k
R5
20k
R4
20k
2 • D
IN
• 4.095
4096
V
OUT
:
D
IN
V
OUT
4.094
–4.096
2048 4095
– 4.096V
This circuit shows how to make a bipolar output 12-bit
DAC with a wide output swing using an LTC1451 and an
LT
®
1077. R1 and R2 resistively divide down the LTC1451
output and an offset is summed in using the LTC1451
onboard 2.048V reference and R3 and R4. R5 ensures that
the onboard reference is always sourcing current and
never has to sink any current even when V
OUT
is at full-
scale. The LT1077 output will have a wide bipolar output
swing of –4.096V to 4.094V as shown in the figure above.
With this output swing 1LSB = 2mV.