标题: TC7129 Data Sheet [打印本页] 作者: admin 时间: 2010-4-17 17:39 标题: TC7129 Data Sheet TC7129 Data Sheet
The TC7129 is a 4-1/2 digit analog-to-digital converter (ADC)that directly drives a multiplexed liquid crystal display (LCD).Fabricated in high-performance,low-power CMOS, the TC7129 ADC is designed specifically for high-resolution, battery-powered digital multimeter applications. The traditional dual-slope method of A/D conversion has been enhanced with a successive integration technique to produce readings accurate to better than 0.005% of full scale, and resolution down to 10µV per count. The TC7129 includes features important to multimeter applications.It detects and indicates low-battery condition. A continuity output drives an annunciator on the display, and can be used with an external driver to sound an audible alarm.Overrange and underrange outputs and a range-change input provide the ability to create auto-ranging instruments.For snapshot readings,the TC7129 includes a latch-and-hold input to freeze the present reading. This combination of features makes the TC7129 the ideal choice for full-featured multimeter and digital measurement applications.
Parameter Name Value
Supply Voltage (V) 9
Power (mW) 4.5
Hold Function No
For DMM, DPM, data loggers No
Resolution (Digits) 4.5
Resolution (Counts) 20000
Display Type LCD
Temp. Range (°C) 0 to 70
Features
- Low Temperature Drift Internal Reference
TC7126...............80 ppm/°C Typ.
TC7126A...............35 ppm/°C Typ.
- Guaranteed Zero Reading With Zero Input
- Low Noise: 15µVP-P
- High Resolution: 0.05%
- Low Input Leakage Current: 1pA Typ. 10pA Max
- Precision Null Detectors With True Polarity at Zero
- High-Impedance Differential Input
- Convenient 9V Battery Operation With Low Power Dissipation: 500Ω
Typ. 900W Max
