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| 型号： | TC7129CLW |
| 厂商： | Microchip Technology |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 4 1/2DGT LCD DVR 44-PLCC |
| 标准包装： | 27 |
| 显示器类型： | LCD |
| 配置： | 7 段显示 |
| 数字或字符： | A/D，4.5 位数字 |
| 电流 - 电源： | 800µA |
| 电源电压： | 6 V ~ 12 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LCC（J 形引线） |
| 供应商设备封装： | 44-PLCC |
| 包装： | 管件 |
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TC7129
Low Battery
Continuity
V+
5 pF
C O1
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Display Drive Outputs
TC7129
120
kHz
Crystal
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
330 k Ω
C INT
0.1 μF
R O
10 pF
C O2
C REF +
1 μF
0.1
μF
R REF
20
k Ω
D REF
C RF
0.1 μF
V+
150 k Ω
R INT
C IF
+
9V
10 k Ω
R BIAS
–
R IF
100 k Ω
+
V IN
Figure 3-1:
Standard Circuit.
3.3 Integrating Capacitor (C INT )
The charge stored in the integrating capacitor during
the integrate phase is directly proportional to the input
voltage. The primary selection criterion for C INT is to
choose a value that gives the highest voltage swing
while remaining within the high-linearity portion of the
integrator output range. An integrator swing of 2V is the
recommended value. The capacitor value can be
calculated using the following equation:
EQUATION 3-1:
The capacitor should have low dielectric absorption to
ensure good integration linearity. Polypropylene and
Teflon ? capacitors are usually suitable. A good
measurement of the dielectric absorption is to connect
the reference capacitor across the inputs by
connecting:
Pin-to-Pin:
20 → 33 (C REF + to IN HI)
30 → 32 (C REF – to IN LO)
A reading between 10,000 and 9998 is acceptable;
C INT =
t INT x I IN T
V SWING
anything lower indicates unacceptably high dielectric
absorption.
Where t INT is the integration time.
3.4
Reference Capacitor (C REF )
The reference capacitor stores the reference voltage
Using the values derived above (assuming 60 Hz
operation), the equation becomes:
EQUATION 3-2:
C INT = 1 6.7 msec x 13.3 μ A = 0.1 μ A
2V
DS21459D-page 8
during several phases of the measurement cycle. Low
leakage is the primary selection criterion for this com-
ponent. The value must be high enough to offset the
effect of stray capacitance at the capacitor terminals. A
value of at least 1 μ F is recommended.
? 2006 Microchip Technology Inc.
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相关代理商/技术参数 |
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| TC7129CLW713 | 功能描述:LCD 驱动器 w/LCD Driver RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7129CPL | 功能描述:LCD 驱动器 w/LCD Driver RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7129CPL713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers |
| TC7129IJL713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers |
| TC7129IKW713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers |
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