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TC835 датащи(PDF) 15 Page - Microchip Technology

номер детали TC835
подробное описание детали  Personal Computer Data Acquisition A/D Converter
PDF  24 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC835 датащи(HTML) 15 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21478B-page 15
TC835
FIGURE 6-2:
RC OSCILLATOR CIRCUIT
FIGURE 6-3:
COMPARATOR CLOCK
CIRCUITS
FIGURE 6-4:
4-1/2 DIGIT ADC WITH MULTIPLEXED COMMON CATHODE LED DISPLAY
R2
R1
FO
Gates are 74C04
C
1. fO =
1
2C(0.41RP +0.7R1)
R1 R2
R1 +R2
a. If R1 =R2 =R1,F
≅ 0.55/RC
b. If R2 >> R1,f
≅ 0.45/R
1C
c. If R
2 << R1,f
≅ 0.72/R
1C
2. Examples:
a. f = 120kHz, C = 420pF
R1 =R2
≈ 10.9kΩ
b. f = 120kHz, C = 420pF, R
2 = 50k
Ω
R
1 = 8.93k
Ω
c. f = 120kHz, C = 220pF, R
2 =5k
Ω
R1 = 27.3kΩ
,RP =
+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
28
27
26
25
24
23
22
21
9
8
7
6
5
4
3
2
1
REF IN
ANALOG
GND
INT
OUT
AZ IN
BUFF
OUT
CREF+
+5V
–5V
UR
DGND
POLARITY
OR
STROBE
RUN/HOLD
CLK IN
BUSY
1
2
3
4
5
6
7
8
9
SET VREF = 1V
100
k
Ω
Analog
GND
0.33
µF
100 k
Ω
1
µF
1
µF
47
k
Ω
150
Ω
+5V
150
Ω
10
11
12
13
14
15
16
17
18
+5V
MC14513
1
µF
20
19
18
17
16
15
–INPUT
+INPUT
V+
D5 (MSD)
B1 (LSB)
B2
(LSD) D1
D2
D3
D4
B4
(MSB) B8
10
11
12
13
14
100
k
Ω
SIG
IN
+
–
0.1
µF
+5V
FOSC = 200kHz
CREF-
V-
TC835
MCP1525



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