MC3458_07 Datasheet, PDF (6/12 Pages) ON Semiconductor – Dual, Low Power Operational Amplifiers

MC3458, MC3358
V_CC
10 k
R2
10 k
R1
V_CC
1/2
MC3458
V_O
+
V_O
R1
R1 +R2
V_O
1
2
V_CC
Figure 9. Voltage Reference
50 k
10 k
V_ret
V_ref ^12ă V_CC
R
5.0 k
V_CC
1/2
MC3458
+
R
C
C
V_O
f_o
1
2πRC
For:
f_o
1.0 kHz
R
16 kΩ
C
0.01 µF
Figure 10. Wien Bridge
Oscillator
e₁
+ _1/2
MC3458
1
C
R
R
a R1
R1
b R1
1/2
MC3458
e₂
+
1/2
MC3458
+
1
C
R
R
e_o = C (1 +a +b) (e₂ –e₁)
R1
V_ret
e_o
V_in
R2
Hysteresis
V_OH
+
1/2
MC3458
V_O
V_O
V_OL
V_inL
R1
R1 +R2
(V_OL
V_ref) +V_ref
V_inH
R1
R1 +R2
(V_OH
V_ref) +V_ref
V_h
R1
R1 +R2
(V_OH
V_OL)
V_inL V_inH
V_ref
Figure 11. High Impedance Differential
Amplifier
Figure 12. Comparator with Hysteresis
C1
R2
V_in
R
C
1/2
MC3458
+
V_ref
R2
Where: T_BP center frequency gain
T_N passband notch gain
R
C
100 k
1/2
MC3458
+
V_ref
Bandpass
R1 ^Output
V_ref
100 k
R3
1/2
MC3458
+
1/2
MC3458
+
V_ref
C1
Figure 13. Bi–Quad Filter
f_o
1
2πRC
R1 QR
R2 ^R1
T_BP
R3 T_N R2
C1 10 C
For: f_o 1.0 kHz
Q 10
T_BP 1
T_N 1ă ā
Notch Output
V_ref
1
2
V_CC
ăR 160 kΩ
ăC 0.001 µF
R1 1.6 MΩ
R2 1.6 MΩ
R3 1.6 MΩ
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