CAT5127_0708 Datasheet, PDF (8/13 Pages) Catalyst Semiconductor – 32-Tap Digitally Programmable Potentiometer (DPP™)

CAT5127, CAT5129
APPLICATION INFORMATION
Potentiometer Configurations
(a) resistive divider (b) variable resistance
(c) two-port
Applications
V1
(-)
+5V
DPP
8
2
1
7
4
CAT5127
V2
(+)
3 ₊ A1
1
R3
R4
–
2
R2
R1 _R2
9
+5V _A3
–⁴
+
8
VO
10
11
6 _– A2
R3
5⁺
7
R4
+2.5V
Programmable Instrumentation Amplifier
+5V
8
2
1
7
RA _{R1 6}
4
CAT5127 ^RB _R2 ³
}pRPOT
}4
(1-p)RPOT
8
7
3
555
+5V
C
0.01µF
0.003µF
6
2
5
1
0.01µF
Programmable Sq. Wave Oscillator (555)
100kΩ
VOUT
VIN (UNREG)
2952
SHUTDOWN
SD
FB
1µF
GND
+5V
8
2
1
7
CAT5127
4
1.23V
R1 ^0.1µF
11kΩ
R2
820
3
R3
10k
6
VO (REG)
6.8µF
IS
+5V
8
2 _CAT5127
1
7
4
330
pR (1-p)R ₃₃₀
6
3
+5V
2_–
76
3⁺
4 A1
1M
+5V
2^–
3⁺
76
4
A2
VO
LT1097
+2.5V
Programmable Voltage Regulator
Programmable I to V convertor
Doc. No. MD-2127 Rev. C
8
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice