31/2 Digit LCD, Low Power Display, A/DConverter with Overrange RecoveryThe Intersil ICL7136 is a high performance, low power 31/2digit, A/D converter. Included are seven segment decoders,display drivers, a reference, and a clock. The ICL7136 isdesigned to interface with a liquid crystal display (LCD) andincludes a multiplexed backplane drive.The ICL7136 brings together a combination of highaccuracy, versatility, and true economy. It features auto-zeroto less than 10μV, zero drift of less than 1μV/oC, input biascurrent of 10pA (Max), and rollover error of less than onecount. True differential inputs and reference are useful in allsystems, but give the designer an uncommon advantagewhen measuring load cells, strain gauges and other bridgetype transducers. Finally, the true economy of single powersupply operation, enables a high performance panel meterto be built with the addition of only 10 passive componentsand a display.The ICL7136 is an improved version of the ICL7126,eliminating the overrange hangover and hysteresis effects,and should be used in its place in all applications. It can alsobe used as a plug-in replacement for the ICL7106 in a widevariety of applications, changing only the passivecomponents.
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