MC34001, B MC34002, B MC34004, B
Figure 13. Positive Peak Detector
6
8
V
–
CC
1/2
–
V
O
MC34002
+
D1
7
1/2
MC34002
5
2
3
*
+
V
1N914
in
1 µF
4
V
EE
Reset
Reset
Network
or Relay
*Polycarbonate capacitor
D1 = Hi–speed, low–reverse leakage diode
Figure 14. Long Interval RC Timer
Figure 15. Isolating Large Capacitive Loads
R2 5.1 k
+15 V
MC34001
V
O
7
20 pF
V
CC
R1
V1
R3
2
3
–
+
V
R
6
C
I
C
R1 5.1 k
MC34001
O
2
7
R4
R2
–
+
R3 10
6
4
R6
3
+2.0 V
4
C
0.5 µF
R
5.1 k
L
–15 V
L
0
Run
Clear
C*
–2.0 V
V
EE
Overshoot
= 10
10%
*Polycarbonate or
Polystyrene Capacitor
R5
t
µs
s
When driving large C , the V slew rate is determined by C
L
O
L
and I
:
O(max)
V I
O
∆
Time (t) = R4 Cn (V /V –V ), R = R , R = 0.1 R
0.02
0.5
O
C
L
R
R
I
3
4
5
6
=
=
V/µs = 0.04 V/µs (with C shown)
L
If R1 = R2: t = 0.693 R4C
∆
t
Design Example: 100 Second Timer
V
= 10 V
C = l.0
R5 = 2.0 k
µ
F
R3 = R4 = 144 M
R1 = R2 = 1.0 k
R
R6 = 20 k
Figure 16. Wide BW, Low Noise,
Low Drift Amplifier
C2
R2
f
240 kHz
max
V
CC
7
10 V
–10 V
R1
C1
2
8
V
in
6
3
MC34001
4
V
EE
S
r
Power BW: f
=
240 kHz
max
2
π
Vp
Parasitic input capacitance (C1
interacts with feedback elements and creates undesirable high–frequency pole.
To compensate add C2 such that: R2C2 R1C1.
3.0 pF plus any additional layout capacitance)
7
MOTOROLA ANALOG IC DEVICE DATA
ONSEMI [ ONSEMI ]
