MC3405 View Datasheet(PDF) - Motorola => Freescale
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MC3405 Datasheet PDF : 12 Pages
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MC3405
Figure 15. Zero Crossing Detector with Temperature Sensor
VCC
Vin
10 k
VCC
2+
3 Comp 1
–
1
R1 1N914 +
R2
V–D
Zero Crossing Detector
VCC
R6
1.0 M
12
+
14
13 Amp 1
VO
Vt = (VBE of Q1)
R4 + R5
R5
–
10 k
VEE
13 > 2VBE
R5
1N914
+
V–D
6
5
+
Comp 2
7
VEE
10 k
–
10 k
Temp
Adjust
VCC
R8 10
+
8
9 Amp 2
R7
–
10 k
13
R3
R1 and R2 control the switching
voltage of the zero crossing detector
±VS = ±VD
R1 + R2
R2
vt
R4
+VS
0
Q1
–VS
R5 Temperature Sensor
vo
Time
VCC
TA < TSet
VEE
Figure 16. LSTTL to CMOS Interface with Hysteresis
+ 5.0 V
27 k
–
Comp *
+
3.0 k *
+ 15 V
2.4 k 50 k
LSTTL
Level Shift
VIL = 1.17 V
VIH = 1.80 V
CMOS
* The same configuration may be used with an op amp if
the 3.0 k resistor is removed.
Figure 17. NOR Gate
VCC
A
B
10 k
3.0 k*
C
+
D
Comp *
G
–
10 k 10 k
G=A+B+C+D
* The same configuration may be used with an
op amp if the 3.0 k resistor is removed.
8
MOTOROLA ANALOG IC DEVICE DATA
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