参数资料
型号: TC7135C/PI
元件分类: ADC
英文描述: 1-CH 4-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PDIP28
封装: 0.600 INCH, PLASTIC, DIP-28
文件页数: 6/28页
文件大小: 443K
代理商: TC7135C/PI
TC7135
DS21460D-page 14
2007 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
77
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
X7
0.33 F
200 kHz
+
Analog
Input
1F
100 k
Ω
1F
4.7 k
Ω
1F
5V
100 k
Ω
100 k
Ω
D
B
C
A
RBI
V+
CREF+
TC7135
MCP1525
a. If R
1 = R2 = R1, F 0.55/RC
a. F = 120 kHz, C = 420 pF
R
1 = 8.93 kΩ
R1 = 27.3 kΩ
R2
R1
FO
Gates are 74C04
C
F
O
1
2C 0.41R
P
0.7R
1
+
()
--------------------------------------------------
=, R
P
R
1R2
R
1
R
2
+
------------------
=
1.
b. If R
2 >> R1, F 0.45/R1C
c. If R
2 << R1, F 0.72/R1C
2. Examples:
R
1 = R2 ≈ 10.9 kΩ
b. F = 120 kHz, C = 420pF, R
2 = 50 kΩ
c. F = 120 kHz, C = 220 pF, R
2 = 5 kΩ
+5V
VOUT
390 pF
30 k
Ω
7
8
2
3
16 k
Ω
0.22 F
16 k
Ω
4
1k
Ω
1
+5V
VOUT
2
3
1
4
7
6
R2
100 k
Ω
R2
100 k
Ω
R3
50 k
Ω
C2
10 pF
R4
2k
Ω
C1
0.1 F
+
LM311
+
LM311
56 k
Ω
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