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TC7136

TelCom
Part Number TC7136
Manufacturer TelCom
Description LOW POWER 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
Published Aug 21, 2005
Detailed Description 1 TC7136 TC7136A LOW POWER, 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS FEATURES s s Fast Overrange Recovery, Guaranteed Fi...
Datasheet PDF File TC7136 PDF File

TC7136
TC7136

Overview
1 TC7136 TC7136A LOW POWER, 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS FEATURES s s Fast Overrange Recovery, Guaranteed First Reading Accuracy Low Temperature Drift Internal Reference TC7136 .
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70 ppm/°C Typ TC7136A .
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35 ppm/°C Typ Guaranteed Zero Reading With Zero Input Low Noise .
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15 µVP-P High Resolution .
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05% Low Input Leakage Current .
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1 pA Typ 10 pA Max Precision Null Detectors With True Polarity at Zero High-Impedance Differential Input Convenient 9V Battery Operation With Low Power Dissipation .
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500 µW Typ 900 µW Max Thermometry Bridge Readouts: Strain Gauges, Load Cells, Null Detectors Digital Meters: Voltage/Current/Ohms/Power, pH Digital Scales, Process Monitors Portable Instrumentation GENERAL DESCRIPTION The TC7136 and TC7136A are low-power, 3-1/2 digit with liquid crystal display (LCD) drivers with analog-todigital converters.
These devices incorporate an "integrator output zero" phase which guarantees overrange recovery.
The performance of existing TC7126, TC7126A and ICL7126-based systems may be upgraded with minor changes to external, passive components.
The TC7136A has an improved internal zener reference voltage circuit which maintains the analog common temperature drift to 35 ppm/°C (typical) and 75 ppm/°C (maximum).
This represents an improvement of two to four times over similar 3-1/2 digit converters.
The costly, spaceconsuming external reference source may be removed.
The TC7136/A limits linearity error to less than 1 count on 200 mV or 2V full-scale ranges.
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 currents and a 1012Ω input impedance.
The differential reference input allows ratiometric measurements ...


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