MC3458D View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MC3458D Datasheet PDF : 8 Pages
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Vref =
1
2
VCC
Vref
MC3458 MC3358
Figure 12. Function Generator
Triangle Wave
Output
+
1/2
MC3458
–
C
R3
75 k
R1
100 k
Vref
Rf
R2
300 k
+
1/2
MC3458
–
f = R1 +RC
4 CRf R1
if,
R3 =
R2 R1
R2 +R1
Square Wave
Output
Figure 13. Multiple Feedback Bandpass Filter
VCC
C
R3
R1
C
Vin
–
1/2
MC3458
R2
+
VO
CO
CO = 10 C
Vref
Vref =
1
2
VCC
Given: fo = center frequency
A(fo) = gain at center frequency
Choose value fo, C.
Then:
R3 =
Q
π fo C
R1 =
2
R3
A(fo)
R2 =
R1 R5
4Q2 R1 – R3
For less than 10% error from operational amplifier
where, fo and BW are expressed in Hz.
Qo fo < 0.1
BW
If source impedance varies, filter may be preceded with
voltage follower buffer to stabilize filter parameters.
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MOTOROLA ANALOG IC DEVICE DATA
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