Datasheet

LTC1662
12
1662fa
typical applications
Micropower Trim Circuit with Coarse/Fine Adjustment. Total Supply Current Is 9.5µA
Using the LTC1258 and the LTC1662 in a Portable Application
Powered by a Single Li-Ion Battery. Total Supply Current Is 8.2µA
+
–
LT1495
4
3.3V
3.3V
V
OUT A
V
OUT B
8
2
1
CS/LD
SDI
SCK
4 6
V
CC
REF
3
2
1
8
5
GND7
3
0.1µF
R2
FINE
1.1M
LTC1662
U1
DAC A
DAC B
R1
COARSE
11k
3.3V
0.1µF
0.1µF
V
OUT
2
0.1µF
LTC1258-2.5
1
2.5V
4
R2
1.1M
R1
11k
1662 TA02
V
OUT
= V
REF
CODE A
1024
+
R1
R2
•
CODE B
1024






= 2.5V
CODE A
1024
+
1
100
•
CODE B
1024






2
0.1µF
Li-Ion BATTERY INPUT
V
IN
≥ 4.3V
LTC1258-4.1
1
4.096V
4
REF
SDI
SCK
CS/LD
V
OUT A
GND
V
CC
LTC1662
V
OUT B
0V TO 4.096V
(4mV/BIT)
0V TO 4.096V
(4mV/BIT)
1662 TA03
4
3
2
1
8
5
7
6
0.1µF