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TC7135 датащи(PDF) 14 Page - Microchip Technology

номер детали TC7135
подробное описание детали  4-1/2 Digit A/D Converter
PDF  22 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7135 датащи(HTML) 14 Page - Microchip Technology

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TC7135
DS21460B-page 14
© 2002 Microchip Technology Inc.
FIGURE 6-2:
4-1/2 DIGIT ADC WITH MULTIPLEXED COMMON ANODE LED DISPLAY
FIGURE 6-3:
RC OSCILLATOR CIRCUIT
FIGURE 6-4:
COMPARATOR CLOCK
CIRCUITS
20
19
18
17
12
23
7
8
16
15
14
13
11
2
1
3
9
10
22
6
5
4
6
2
1
7
5
9–15
16
bc
777
7
DM7447A
Blank MSD On Zero
D1 D2
D3
D4
D5
INT OUT
AZ IN
BUFF
OUT
FIN
+INPUT
–INPUT
ANALOG
COMMON
V –
REF
IN
POL
CREF-
B8
B4
B2
B1
+5V
+5V
X7
0.33
µF
200kHz
+
–
Analog
Input
1
µF
100k
Ω
1
µF
4.7k
Ω
1
µF
1
µF
–5V
100k
Ω
100k
Ω
D
B
C
A
RBI
V+
V+
CREF+
TC7135
MCP1525
R2
R1
FO
Gates are 74C04
C
1. FO =
1
2C(0.41 RP +0.7 R1)
R1 R2
R1 +R2
a. If R1 =R2 =R1,F
≅ 0.55/RC
b. If R2 >> R1,F
≅ 0.45/R
1C
c. If R2 << R1,F
≅ 0.72/R
1C
2. Examples:
a. F = 120kHz, C = 420pF
b. F = 120kHz, C = 420pF, R2 = 50k
Ω
R1 = 8.93k
Ω
c. F = 120 kHz, C = 220 pF, R2 =5k
Ω
R1 = 27.3kΩ
,RP =
R
1 =R2
≈ 10.9 kΩ
+5V
VOUT
390pF
30k
Ω
7
8
2
3
16k
Ω
0.22
µF
16k
Ω
4
1k
Ω
1
+5V
VOUT
2
3
1
4
7
6
R2
100k
Ω
R2
100k
Ω
R3
50k
Ω
C2
10pF
R4
2k
Ω
C1
0.1
µF
LM311
LM311
56k
Ω



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