CAT5115_13 Datasheet, PDF (6/12 Pages) ON Semiconductor – 32‐tap Digital Potentiometer (POT)

CAT5115
APPLICATIONS INFORMATION
(a) resistive divider
(b) variable resistance
Figure 6. Potentiometer Configuration
(c) two−port
Applications
V₁ (−)
3
+
2_–
+5 V
28
1
7
R₂
R₁
R₂
4
CAT5113/5114/5115
–
6
V₂ (+)
5⁺
1 ^R3
R₄
+5 V
+5 V
2
1
8
R_A
9 – ⁴ A₃
7
10
+
8
11
V_O
4
R_B
R₃
R₄
+2.5 V
7
A₁ = A₂ = A₃ = ¹/₄ LM6064
C
R₂ = R₃ = R₄ = 5 kW
R_POT = 10 kW
R₁
6
pR_POT
4
7
3 ^{5 (1−p)RPOT}
R₂
6
+5 V
8
3
555
5
0.01 mF
0.003 mF
2
1
0.01 mF
Figure 7. Programmable Instrumentation
Amplifier
Figure 8. Programmable Sq. Wave Oscillator (555)
OSC
CS
IC3A
1_{/4 74HC132}
10 kW
0.01 F
2
+5
8
V
+200
mV
1
7
+
4
–
CAT5111/5112
IC2
20 kW
7
ICIB
6
V_REF = 1 V
5
V_CORR
499 kW
499 kW
2
3
+5 V
–
41
V_OUT = 1 V  1 mV
+ _{11 ICIA}
−5 V
499 kW
499 kW
V_SENSOR = 1 V  50 mV
V_SHIFT = 100 mV
Figure 9. Sensor Auto Referencing Circuit
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