TC7126CKW

The TC7126 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 TC7126 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 TC7126’s extremely low-power drain and 9V battery operation make it ideal for portable applications. The TC7126 reduces linearity error to less than 1 count. Rollover error (the difference in readings for equal magnitude, but opposite polarity input signals) is below ±1 count. High-impedance differential inputs offer 1pA leakage current and a 1012O input impedance. The 15µVP-P noise performance ensures a “rock solid” reading, and the auto-zero cycle ensures a zero display reading with a 0V input. The TC7126 features a precision, low drift internal voltage reference and is functionally identical to the TC7126. A low drift external reference is not normally required with the TC7126.

• Internal Reference with Low Temperature Drift: - TC7126: 80ppm/°C, Typical - TC7126: 35ppm/°C, Typical
• 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: 500µW Typ., 900µW Max.