MC34071,2,4,A MC33071,2,4,A
Figure 49. Low Input Voltage Comparator
with Hysteresis
Figure 50. High Compliance Voltage to
Sink Current Converter
V
Hysteresis
O
I
R2
out
V
V
V
V
in
OH
ref
R1
+
+
MC34071
–
MC34071
–
OL
V
in
V
in
V
V
inH
inL
V
R1
ref
V
V
V
=
(V –V )+V
OL ref
inL
ref
R1+R2
R
V
±V
R1
in IO
R
=
(V –V )+V
OH ref
I
=
inH
ref
out
R1+R2
R1
=
(V )
–V
H
OH OL
R1+R
Figure 51. High Input Impedance
Differential Amplifier
Figure 52. Bridge Current Amplifier
+V
ref
R1
R2
R
R4
F
R
R
–
R3
1/2
–
V
–
V
O
MC34072
+
1/2
O
MC34072
MC34071
+V1
+V2
+
R
+
R =
∆R
R2
R1
R4
R3
∆
R R
F
=
(Critical to CMRR)
V
= V
ref
O
2
2R
R
F
∆
R < < R
R4
R3
R4
R3
V
= 1
+
V2–V1
O
R
> > R
(V ≥ 0.1 V)
O
F
For (V2
≥ V1), V > 0
Figure 54. High Frequency Pulse
Width Modulation
Figure 53. Low Voltage Peak Detector
0.85
RC
f
OSC
+
I
B
V
+
SC
V
in
I
+
V
= V (pk)
in
O
MC34071
V
t
P
0
–
t
–
Base Charge
Removal
+
I
out
R
V
10,000 pF
L
P
R
–
+
1/2
MC34072
1/2
MC34072
C
+
–
±I
B
V
in
V+
100 k
V
P
Pulse Width
Control Group
100 k
V
P
47 k
t
OSC
Comparator
High Current
Output
14
MOTOROLA ANALOG IC DEVICE DATA
MOTOROLA [ MOTOROLA ]
