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參數(shù)資料
| 型號： | MC1403 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Low Voltage Reference(低電壓參考源) |
| 中文描述： | 低電壓參考（低電壓參考源） |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 88K |
| 代理商： | MC1403 |
MC1403, B
http://onsemi.com
5
31/2Digit Voltmeter Common Anode
Displays, Flashing Overrange
An example of a 31/2digit 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, R
I
is also changed, as shown on
the diagram.
When using R
C
equal to 300 k , 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 onehalf the conversion rate. This
is done by dividing the EOC pulse rate by 2 with 1/2
MC14013B flipflop 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 MPSA12
Darlington transistors operating in an emitterfollower
configuration. The MC14543B, MC14013B and LED
displays are referenced to V
EE
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 in Figure 8.
Figure 8. 31/2Digit Voltmeter
Common
Anode
LED
Display
* R
I
= 470 k for 2.0 V Range
R
I
= 27 k for 200 mV Range
** Mylar Capacitor
0.1 F
3
2
1
+5.0 V
0.1 F
R
C
300 k
V
X
R
I
*
20 k
5.0 V
0.1 F
+5.0 V
0.1 F
0.1 F
Plus Sign
50 F
Minus Sign
Segment Resistors
150
(7)
MPSA12
+5.0 V
MC14013B
51 k
MC14433
0.1 F
C
Q
Q
R
S
D
14
DS1
6
7 10
5.0 V
5.0 V
C
8
6
16
1
19
5.0 V
DS
R
Q
Q
+5.0 V
MPSA12
(4)
7
MC1403
200
110
0.1 F **
DS2
DS3
DS4
1
2
8
13
12
11
9
4
3
5
10
11
12
1
2
3
4
5
9
5
3
2
4
16
15
14
13
7
6
15
14
13
11
12
10
14
16
17
18
15
8
7
6
5
4
13
9
22
21
20
23
24
1
12
2
10
11
3
b a
c
d
e
g
f
M
M
+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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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MC1403_02 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2.5V PRECISION SERIAL VOLTAGE REFERENCE |
| MC1403_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Low Voltage Reference |
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| MC14032BCL | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Triple Serial Adders |
| MC14032BCP | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Triple Serial Adders |
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