MC34071,2,4,A MC33071,2,4,A, NCV33072,4,A
V
O
Hysteresis
R2
V
V
V
OH
ref
R1
I
out
+
MC34071
OL
V
in
-
V
in
+
MC34071
V
in
V
inL
V
inH
R1
V
ref
-
V
V
V
=
=
(V -V )+V
OL ref
inL
ref
R1+R2
R1
(V -V )+V
inH
OH ref
ref
R1+R2
R
V
V
R1
in IO
=
(V -V
)
OL
I
=
H
OH
out
R1+R
R
Figure 50. Low Input Voltage Comparator
with Hysteresis
Figure 51. High Compliance Voltage to
Sink Current Converter
R1
R2
+V
R4
ref
R
F
-
MC34072
R3
1/2
R
R
-
MC34072
V
O
1/2
+
+V1
+V2
-
MC34071
V
O
+
R
+
R = DR
R2
R1
R4
R3
=
(Critical to CMRR)
DR R
F
R4
R3
R4
V
O
= V
ref
V
O
= 1
+
V2-V1
2
2R
R
F
R3
DR < < R
R
> > R
For (V2 ≥ V1), V > 0
(V ≥ 0.1 V)
O
F
Figure 52. High Input Impedance
Differential Amplifier
Figure 53. Bridge Current Amplifier
0.85
f
^
OSC
+
I
B
RC
+
SC
V
I
V
t
P
0
-
t
V
in
Base Charge
Removal
+
V
+
= V (pk)
in
O
MC34071
-
I
out
R
-
MC34072
+
1/2
MC34072
1/2
R
V
P
10,000 pF
C
L
+
-
I
B
V+
100 k
Pulse Width
Control Group
100 k
V
P
V
in
47 k
V
P
OSC
Comparator
High Current
Output
t
Figure 54. Low Voltage Peak Detector
Figure 55. High Frequency Pulse
Width Modulation
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14
ROCHESTER [ Rochester Electronics ]
