MC34071,2,4,A MC33071,2,4,A
Figure 49. Low Input Voltage Comparator
with Hysteresis
VO
R2
Vref
R1
+
MC34071
Figure 50. High Compliance Voltage to
Sink Current Converter
Iout
Hysteresis
VOH
VOL
Vin
VinL
VinH
Vref
Vin
+
MC34071
–
Vin
R1
VinL =
(V –V )+V
R1+R2 OL ref ref
R1
VinH =
(V –V )+V
R1+R2 OH ref ref
R1
VH =
(VOH –VOL)
R1+R
–
Iout =
Vin
±V
IO
R
R
Figure 51. High Input Impedance
Differential Amplifier
R1
R2
R4
Figure 52. Bridge Current Amplifier
+Vref
RF
R
R
–
MC34071
–
1/2
MC34072
R3
–
1/2
MC34072
+
VO
R =
∆R
R
VO
+V1
+V2
+
+
∆R
RF
2R2
R2
R4
=
(Critical to CMRR)
R1
R3
R4
R4
VO = 1 +
V2–V1
R3
R3
For (V2
≥
V1), V > 0
∆R
< < R
RF > > R
RF
VO = Vref
(VO
≥
0.1 V)
Figure 53. Low Voltage Peak Detector
fOSC
Vin
+
MC34071
Figure 54. High Frequency Pulse
Width Modulation
^
0.85
RC
V
VP
t
+ IB
0
–
+
ISC
t
Base Charge
Removal
Iout
–
1/2
C
MC34072
VO = Vin (pk)
–
+
RL
VP
10,000 pF
R
+
1/2
MC34072
–
100 k
100 k
47 k
VP
Pulse Width
Control Group
Vin
VP
V+
+
±I
B
t
OSC
Comparator
High Current
Output
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