TC7126/A
3-1/2 Digit Analog-to-Digital Converters
Features: General Description: Internal Reference with Low Temperature Drift:
-TC7126: 80ppm/В°C, Typical
-TC7126A: 35ppm/В°C, Typical Zero Reading with Zero Input Low Noise: 15пЃVP-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: 500пЃW Typ., 900пЃW Max. 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. Applications: Thermometry Bridge Readouts: Strain Gauges, Load Cells,
Null Detectors Digital Meters and Panel Meters:
-Voltage/Current/Ohms/Power, pH Digital Scales, Process Monitors Device Selection Table
Package
Code Package Temperature
Range CPL 40-Pin PDIP 0п‚°C to +70п‚°C IPL 40-Pin PDIP (TC7126 Only) -25п‚°C to +85п‚°C CKW 44-Pin PQFP 0п‚°C to +70п‚°C CLW 44-Pin PLCC 0п‚°C to +70п‚°C пѓЈ 2002-2012 Microchip Technology Inc. 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. Rollover error (the difference in readings for
equal magnitude, but opposite polarity input signals) is …
