4
LTC8043
TI I G DIAGRA
UW W
SRI
LD
PREVIOUS
WORD
BIT 1
MSB
BIT 2 BIT 11
8043TD01
BIT 12
LSB
t
DS
t
DH
t
CH
t
SRI
t
ASB
t
CL
t
LD
CLK INPUT
TYPICAL APPLICATIONS N
U
Unipolar Operation (2-Quadrant Multiplication)
V
DD
V
REF
LTC8043
R
FB
GND
4
7
6
5
8
5V
V
REF
–10V TO 10V
CLK
SRI
LD
1
2
3
I
OUT
33pF
V
OUT
LTC8043 • TA03
–
+
LT1097
µP
Table 1. Unipolar Binary Code Table
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
–V
REF
(4095/4096)
–V
REF
(2048/4096) = –V
REF
/2
–V
REF
(1/4096)
0V
0.1µF
MSB LSB
1111 1111 1111
1000 0000 0000
0000 0000 0001
0000 0000 0000
ANALOG OUTPUT
V
OUT
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC1257 Complete Serial I/O V
OUT
12-Bit DAC 5V to 15V Single Supply in 8-Pin SO and PDIP
LTC1451/LTC1452/LTC1453 Complete Serial I/O V
OUT
12-Bit DACs 3V/5V Single Supply in 8-Pin SO and PDIP
LTC7541A Parallel I/O Multiplying 12-Bit DAC 12-Bit Wide Input
LTC7543/LTC8143 Serial I/O Mulitplying 12-Bit DACs Clear Pin and Serial Data Output (LTC8143)
7
6
5
5V
µP
0.1µF
V
DD
V
REF
LTC8043
R
FB
GND
4
8
V
REF
–10V TO 10V
CLK
SRI
LD
1
2
3
I
OUT
V
OUT
LTC8043 • TA04
–
+
1/2 LT1112
Table 2. Bipolar Offset Binary Code Table
+V
REF
(2047/2048)
+V
REF
(1/2048)
0V
–V
REF
(1/2048)
–V
REF
(2048/2048) = –V
REF
R3
20k
R1
10k
R2
20k
–
+
1/2 LT1112
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
MSB LSB
1111 1111 1111
1000 0000 0001
1000 0000 0000
0111 1111 1111
0000 0000 0000
ANALOG OUTPUT
V
OUT
33pF
Bipolar Operation (4-Quadrant Multiplication)
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900
●
FAX
: (408) 434-0507
●
TELEX
: 499-3977
LT/GP 1195 • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1995
