TC7126/126A Data Sheet

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  TC7126/126A Data Sheet


The TC7126A is a 3-1/2 digit CMOS analog-to-digital converter (ADC)containing all the active components necessary to construct a 0.05%resolution measurement system.Seven-segment decoders,digit and polarity drivers, voltage reference,and clock circuit are integrated on-chip. The TC7126A directly drives a liquid crystal display (LCD), and includes a backplane driver. A low-cost,high-resolution indicating meter requires only a display,four resistors,and four capacitors. The TC7126A's extremely low power drain and 9V battery operation make it ideal for portable applications. The TC7126A reduces linearity error to less than 1 count.Roll-over error (the difference in readings for equal magnitude but opposite polarity input signals)is below ±1 count.High-impedance differential inputs offer 1 pA leakage current and a 10 12 Ω input impedance.The 15 µVP-P noise performance guarantees a "rock solid"reading,and the auto-zero cycle guarantees a zero display reading with a 0V input. The TC7126A features a precision, low-drift internal voltage reference an disfunctionally identical to the TC7126. A low-drift external reference is not normally required with the TC7126A.

Parameter Name  Value
Supply Voltage (V)  9
Power (mW)  0.5
Hold Function  No
For DMM, DPM, data loggers  No
Resolution (Digits)  3.5
Resolution (Counts)  2000
Display Type  LCD  
Temp. Range (°C)  -25 to 85

     Features
- Fast Overrange Recovery, Guaranteed  First Reading Accuracy
- Low Temperature Drift Internal Reference
     TC7136...............70 ppm/°C Typ.
     TC7136A...............35ppm/°C Typ.
- Guaranteed Zero Reading With Zero Input
- Low Noise: 15 µVP-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



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