TC7107A

TC7106 TC7106A TC7107 TC7107A 3-1/2 DIGIT A/D CONVERTERS FEATURES s Internal Reference with Low Temperature Drift TC7106/7 ....................................... 80ppm/°C Typical TC7106A/7A .................................. 20ppm/°C Typical s Drives LCD (TC7106) or LED (TC7107) Display Directly s Guaranteed Zero Reading With Zero Input s Low Noise for Stable Display s Auto-Zero Cycle Eliminates Need for Zero Adjustment s True Polarity Indication for Precision Null Applications s Convenient 9 V Battery Operation (TC7106A) s High Impedance CMOS Differential Inputs .... 1012Ω s Differential Reference Inputs Simplify Ratiometric Measurements s Low Power Operation ..................................... 10mW 1 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 precision 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. A low-cost, high-resolution indicating meter requires only a display, four resistors, and four capacitors. The TC7106A low power drain and 9V battery operation make it suitable for portable applications. The TC7106A/TC7107A reduces linearity error to less...