Pentek 6210 Operating Manual page 164

LTC1451
LTC1452/LTC1453
TYPICAL APPLICATION
This circuit shows how to make a bipolar output 12-bit
DAC with a wide output swing using an LTC1451 and an
LT1077. 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
µP
4.094
V
OUT
– 4.096
RELATED PARTS
PART NUMBER DESCRIPTION
LTC1257 5V to 15V Single Supply, Complete 12-Bit V
DAC in SO-8 Package
LTC1446/LTC1446L Dual 12-Bit V
LTC1448 Dual 12-Bit V
LTC1655/LTC1655L 5V/3V 16-Bit V
LTC1659 Single 12-Bit V
LTC7541 12-Bit Multiplying Parallel I
LTC7543/LTC8143 12-Bit Multiplying Serial I
LTC8043 12-Bit Multiplying Serial I
Linear Technology Corporation
12
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 : (408) 434-0507
FAX
A Wide Swing, Bipolar Output 12-Bit DAC
5V
0.1µF
V
CC
CLK
V
LTC1451
D
OUT
IN
CS/LD
GND V
REF
2048 4095
R3
D
IN
10k
R5
20k
DACs in SO-8
OUT
DAC in SO-8
OUT
DAC in SO-8
OUT
DAC in MSOP
OUT
DAC
OUT
DAC
OUT
DAC
OUT
: 499-3977
TELEX
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 4.094V as shown in the figure above.
With this output swing 1LSB = 2mV.
R1
5V
5k
+
LT1077
R2
10k
–
– 5V
R4
20k
COMMENTS
Reference Can Be Overdriven Up to 12V, i.e., FS MAX = 12V
OUT
5V with 4.096V Full-Scale Output/3V with 2.5V Full Scale
V from 2.7V to 5.5V, Output Swings to V
CC
Pin Conpatible with LTC1451/LTC1453
V from 2.7V to 5.5V, Output Swings to V
CC
5V to 16V Supply, 12-Bit Wide Interface
5V Supply, Clear Pin and Serial Data Output (LTC8143)
5V Supply, SO-8 Package
OUT
2 • D • 4.095
IN
V : – 4.096V
OUT
4096
1451/2/3 TA06
REF
REF
145123fa LT/TP 0100 2K REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1995
is at full-