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Analog Microelectronics, Inc. 1 AME811/AME811A/AME811R 3-1/2 Digit A/D Converter - Low Power With HOLD And Differential Reference Inputs n n n n n Key Features l 100µV Resolution l High Impedance Differential Inputs l Differential Reference l Drive LCD Directly l Three New Convenient Features (AME811A Only) l Low-Battery Indication l Integration Status Indication l De-Integration Status Indication n n n n n Applications l Digital multimeter l pH meter l Capacitance meter l Thermometer l Digital Panel meter l Photometer n n n n n General Description The AME811 family are high performance, low power. 3-1/2 digit, dual-slope integrating A/D converters, with on-chip display drivers. The AME811 is designed for a single battery operated system, will drive non-multi- plexed LCD display directly. These A/D converters are inherently versatile and ac- curate. They are immune to the high noise environ- ments. The true differential high impedance inputs and differential reference are very useful for making ratiometric measurement, such as resistance, strain gauge and bridge transducers. The built-in auto-zero feature automatically corrects the system offset with- out any external adjustments. Low-battery flag, integration and de-integration status flags are three additional features which are available in the 44-pin package, AME811ACKW. n n n n n Typical Operating Circuit * For the operating circuit of the reverse-pins version, please refer to pin configuration on page 4 and pin description on page 5 & 6. AN ALOG CREF+ VREF+ VREF- VREF CREF- INPUT IN HI LCD DISPLAY SEGMENT DRIVE IN LO PO L BP V+ CO M MINUS SIGN BACKPLANE DRIVE BUF A/Z INT VREF FULL SCALE IN PUT 200.0mV 100.0mV TO ANALO G COM MON (P32) V- OSC OSC 21 35 31 2-19 22-25 30 20 21 38 36 9V 33 26 40 39 20pF 10pF V+ V+ 32 28 29 27 34 1M 47K 24K 1K 0.01 0.1 0.47 0.22 20M 40KHz 470K |
