CAT5115 Datasheet, PDF (6/14 Pages) Catalyst Semiconductor – 32-Tap Digitally Programmable Potentiometer

CAT5115
APPLICATIONS INFORMATION
POTENTIOMETER CONFIGURATION
(a) resistive divider (b) variable resistance
(c) two-port
APPLICATIONS
V₁ (-)
3₊
1
R₃
R₄
–
2
+5V
8
2
1 _DPP
7
R₂
R₁
R₂
4
6_–
CAT5113/5114/5115
V₂ (+)
5⁺
7
+5V
9
– ⁴ A₃
V_O
10 ⁺
8
11
R₃
R₄
+2.5V
A₁ = A₂ = A₃ = ¼ LM6064
R₂ = R₃ = R₄ = 5kΩ
R_POT = 10kΩ
Programmable Instrumentation Amplifier
+5V
8
R₁
2
R_A
6
1 _DPP
7
pR_POT
4
7
+5V
8
4
3 ^{5 (1-p)RPOT}
3
R_B
555
R₂
6
0.01µF
2
C
0.003µF
5
1
0.01µF
Programmable Sq. Wave Oscillator (555)
OSC
CS
IC3A
¼ 74HC132
10kΩ
0.01µF
+5V +200mV
8
2
1 _DPP
7
4
+
–
CAT5111/5112
IC2
20kΩ
7
6
V_REF = 1V
5
ICIB
V_CORR
499kΩ
499kΩ
+5V
2_–
4
1
3⁺
11 ICIA
-5V
499kΩ
499kΩ
V_SENSOR = 1V ± 50mV
V_OUT = 1V ± 1mV
V_SHIFT = 100mV
Sensor Auto Referencing Circuit
Doc. No. MD-2117 Rev. J
6
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Characteristics subject to change without notice