CAT5127_13 Datasheet, PDF (7/10 Pages) ON Semiconductor – 32‐tap Digital Potentiometers (POTs)

CAT5127, CAT5129
APPLICATION INFORMATION
(a) resistive divider
(b) variable resistance
Figure 4. Potentiometer Configurations
(c) two−port
Applications
V₁
(−)
+5 V
8
2
1
7
4
CAT5127
V₂
(+)
3 ₊ ^A1 ₁
2–
R₂
R₁
R₂
6 _– ^A2
+
7
5
R₃
R₄
+5 V
9
4
–
A₃
+5 V
8
2
1
7
R₁
R_A
+
10
11 ⁸
V_O
4
CAT5127 ^RB _R2
R₃
R₄
+2.5 V
A₁ = A₂ = A₃ = ¹/₄ LM 6064
R₂ = R₃ = R₄ = 5 kW
R_POT = 10 kW
C
0.01 mF
0.003 mF
6
} pR_POT
4
} (1−p)R_POT
3
7
8
3
555
6
5
2
1
+5 V
0.01 mF
Figure 5. Programmable Instrumentation Amplifier
Figure 6. Programmable Sq. Wave Oscillator (555)
100 kW
V_OUT
V_IN(UNREG)
2952
SHUTDOWN
1 mF
+5 V
8
2
1
SD
GND
FB
7
CAT5127
4
1.23 V
R₁
11 kW
R₂
820
3
R₃
10 k
6
0.1 mF
V_O(REG)
6.8 mF
I_S
Figure 7. Programmable Voltage Regulator
+5 V
8
2
1
CAT5127
7
4
330
pR ^(1−p)R
6
+5 V
2–
76
3+
4 A1
3 ₃₃₀
1M
+5 V
–
2
7 _{6 VO}
3+
4 A2
LT1097
+2.5 V
Figure 8. Programmable I to V Convertor
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