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MC1403P1 Arkusz danych(PDF) 4 Page - ON Semiconductor

Numer części MC1403P1
Szczegółowy opis  PRECISION LOW VOLTAGE REFERENCE
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MC1403, B
4
MOTOROLA ANALOG IC DEVICE DATA
3–1/2–Digit Voltmeter – Common Anode
Displays, Flashing Overrange
An example of a 3–1/2–digit voltmeter using the MC14433
is shown in the circuit diagram of Figure 8. The reference
voltage for the system uses an MC1403 2.5 V reference IC.
The full scale potentiometer can calibrate for a full scale of
199.9 mV or 1.999 V. When switching from 2.0 V to 200 mV
operation, RI is also changed, as shown on the diagram.
When using RC equal to 300 kΩ, the clock frequency for
the system is about 66 kHz. The resulting conversion time is
approximately 250 ms.
When the input is overrange, the display flashes on and
off. The flashing rate is one–half the conversion rate. This is
done by dividing the EOC pulse rate by 2 with 1/2 MC14013B
flip–flop and blanking the display using the blanking input of
the MC14543B.
The display uses an LED display with common anode digit
lines driven with an MC14543B decoder and an MC1413
LED driver. The MC1413 contains 7 Darlington transistor
drivers and resistors to drive the segments of the display. The
digit drive is provided by four MPS–A12 Darlington
transistors operating in an emitter–follower configuration.
The MC14543B, MC14013B and LED displays are
referenced to VEE via Pin 13 of the MC14433. This places the
full power supply voltage across the display. The current for
the display may be adjusted by the value of the segment
resistors shown as 150
Ω in Figure 8.
Figure 8. 3–1/2–Digit Voltmeter
Common
Anode
LED
Display
* RI = 470 kΩ for 2.0 V Range
RI = 27 kΩ for 200 mV Range
** Mylar Capacitor
0.1
µF
3
2
1
+5.0 V
0.1
µF
RC
300 k
VX
RI *
20 k
–5.0 V
0.1
µF
+5.0 V
0.1
µF
0.1
µF
Plus Sign
50
µF
Minus Sign
Segment Resistors
150
Ω (7)
MPS–A12
+5.0 V
MC14013B
51 k
MC14433
0.1
µF
CQ
Q
R
S
D
14
DS1
6
710
–5.0 V
–5.0 V
C
8
6
16
1
19
5.0 V
D S
R
Q
Q
+5.0 V
MPS–A12
(4)
7
MC1403
200
110
0.1
µF **
DS2
DS3
DS4
1
2
8
13
12
11
9
4
3
5
10
1
2
3
4
5
9
5
3
2
4
16
15
14
13
11
12
7
15
14
13
6
11
10
14
16
17
18
15
8
7
6
5
4
13
12
9
22
23
21
24
1
12
20
2
10
11
3
ba
c
d
e
g
f
+5.0 V
+5.0 V
–5.0 V
–5.0 V
–5.0 V
–5.0 V
–5.0 V


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