MC34071,2,4,A MC33071,2,4,A, NCV33074A
V
O
R2
V
ref
R1
V
OH
+
MC34071
Hysteresis
I
out
V
in
V
inL
V
inH
V
ref
V
in
+
MC34071
−
V
in
V
inL
=
V
inH
=
V
H
=
R1
(V
OL
−V
ref
)+V
ref
R1+R2
R1
(V
OH
−V
ref
)+V
ref
R1+R2
R1
(V
OH
−V
OL
)
R1+R
V
OL
−
I
out
=
V
in
±V
IO
R
R
Figure 50. Low Input Voltage Comparator
with Hysteresis
Figure 51. High Compliance Voltage to
Sink Current Converter
R1
R2
R4
−
1/2
+
R3
MC34072
+V
ref
R
F
R
R
−
MC34071
MC34072
−
1/2
+
V
O
+V1
+V2
V
O
R =
DR
R
+
DR
R
F
2R
2
R2
R4
=
(Critical to CMRR)
R1
R3
R4
R4
V
O
= 1 +
V2−V1
R3
R3
For (V2
≥
V1), V > 0
DR
< < R
R
F
> > R
R
F
V
O
= V
ref
(V
O
≥
0.1 V)
Figure 52. High Input Impedance
Differential Amplifier
f
OSC
^
Figure 53. Bridge Current Amplifier
0.85
RC
V
V
P
+ I
B
0
−
+
I
SC
t
Base Charge
Removal
I
out
−
1/2
+
100 k
100 k
47 k
V
P
Pulse Width
Control Group
R
+
1/2
MC34072
−
±I
B
V
in
+
MC34071
V
O
= V
in
(pk)
t
−
+
R
L
V
P
10,000 pF
V+
V
in
V
P
C
MC34072
OSC
t
Comparator
High Current
Output
Figure 54. Low Voltage Peak Detector
Figure 55. High Frequency Pulse
Width Modulation
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