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| 型号： | TC7129CLW713 |
| 厂商： | Microchip Technology |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 4 1/2DGT LCD DVR 44-PLCC |
| 标准包装： | 500 |
| 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： | 带卷 (TR) |
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TC7129
4.8
Successive Integration
4.9
Digital Auto-Zeroing
The successive integration technique picks up where
dual-slope conversion ends. The overshoot voltage
shown in Figure 4-9 (called the “integrator residue
voltage”) is measured to obtain a correction to the initial
count. Figure 4-10 shows the cycles in a successive
integration measurement.
The waveform shown is for a negative input signal. The
sequence of events during the measurement cycle is
To eliminate the effect of amplifier offset errors, the
TC7129 uses a digital auto-zeroing technique. After the
input voltage is measured as described above, the
measurement is repeated with the inputs shorted
internally. The reading with inputs shorted is a
measurement of the internal errors and is subtracted
from the previous reading to obtain a corrected
measurement. Digital auto-zeroing eliminates the need
for an external auto-zeroing capacitor used in other
ADCs.
TABLE 4-1:
MEASUREMENT CYCLE
SEQUENCE
4.10
Inside the TC7129
Phase
INT 1
DE 1
Description
Input signal is integrated for fixed time (1000 clock
cycles on 2V scale, 10,000 on 200 mV).
Integrator voltage is ramped to zero. Counter
TC7129.
counts up until zero-crossing to produce reading
accurate to 3-1/2 digits. Residue represents an
overshoot of the actual input voltage.
REST Rest; circuit settles.
X10
DE 2
Residue voltage is amplified 10 times and
inverted.
Integrator voltage is ramped to zero. Counter
counts down until zero-crossing to correct reading
to 4-1/2 digits. Residue represents an undershoot
of the actual input voltage.
REST Rest; circuit settles.
X10
DE 3
Residue voltage is amplified 10 times and
inverted.
Integrator voltage is ramped to zero. Counter
counts up until zero-crossing to correct reading to
5-1/2 digits. Residue is discarded.
? 2006 Microchip Technology Inc.
DS21459D-page 13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| TC7129ILW713 | 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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