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GENERAL DESCRIPTION

The TC7106A and TC7107A 3-1/2 digit direct-display drive analog-to-digital converters allow existing 7106/7107 based systems to be upgraded. Each device has a preci sion reference with a 20ppm/°C max temperature coefficient. This represents a 4 to 7 times improvement over similar 3-1/2 digit converters. Existing 7106 and 7107 based systems may be upgraded without changing external passive component values. The TC7107A drives common anode light emitting diode (LED) displays directly with 8mA per segment.

FEATURES

■ Internal Reference with Low Temperature Drift

TC7106/7 .................................... 80ppm/°C Typical

TC7106A/7A .................................. 20ppm/°C Typical

■ Drives LCD (TC7106) or LED (TC7107) Display Directly

■ Guaranteed Zero Reading With Zero Input

■ Low Noise for Stable Display

■ Auto-Zero Cycle Eliminates Need for Zero Adjustment

■ True Polarity Indication for Precision Null Applications

■ Convenient 9 V Battery Operation (TC7106A)

■ High Impedance CMOS Differential Inputs.... 1012?

■ Differential Reference Inputs Simplify Ratiometric Measurements

■ Low Power Operation ............................... 10mW