TC7116

TC7116 TC7116A TC7117 TC7117A 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD FEATURES s Low Temperature Drift Internal Reference TC7116/TC7117 ............................. 80 ppm/°C Typ TC7116A/TC7117A ........................ 20 ppm/°C Typ s Display Hold Function s Directly Drives LCD or LED Display s Guaranteed Zero Reading With Zero Input s Low Noise for Stable Display ......... 2V or 200 mV Full-Scale Range (FSR) s Auto-Zero Cycle Eliminates Need for Zero Adjustment Potentiometer s True Polarity Indication for Precision Null Applications s Convenient 9V Battery Operation (TC7116/TC7116A) s High Impedance CMOS Differential Inputs .... 1012Ω s Low Power Operation .................................... 10 mW 1 GENERAL DESCRIPTION The TC7116A/TC7117A are 3-1/2 digit CMOS analogto-digital converters (ADCs) containing all the active components necessary to construct a 0.05% resolution measurement system. Seven-segment decoders, polarity and digit drivers, voltage reference, and clock circuit are integrated on-chip. The TC7116A drives liquid crystal displays (LCDs) and includes a backplane driver. The TC7117A drives common anode light emitting diode (LED) displays directly with an 8-mA drive current per segment. These devices incorporate a display hold (HLDR) function. The displayed reading remains indefinitely, as long as HLDR is held high. Conversions continue, but output data display latches are not updated. The reference – ) is not available as it is with the TC7106/ lo...