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AME811A Datasheet(PDF) 10 Page - Analog Microelectronics |
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AME811A Datasheet(HTML) 10 Page - Analog Microelectronics |
10 / 15 page Analog Microelectronics, Inc. 10 AME811/AME811A/AME811R 3-1/2 Digit A/D Converter - Low Power With HOLD And Differential Reference Inputs Test When the TEST is pulled to V+ all segments and the minus sign will be activated. The TEST pin is tied to the internally generated digital ground through a 500 Ω resistor in the AME811. It is typically 5V lower than V+. TEST pin may be used as the negative power supply for external CMOS logic at the maximum current of 1 mA. Data Hold When the Hold pin is connected to V+ the conversion result will not be updated. The conversion is still free running during the hold mode. Integration Status (INTEN) The INTEN is an output signal of the converter, it is “high” during the signal integration phase. This signal can be used as a status indicator or a control to con- nect the analog signal to the converter for processing. It is available in 44 pin package. De-integration Status (DEEN) The DEEN is an output signal of the converter, it is “high” during the reference de-integration phase. The period of the DEEN is proportional to the conversion result. Users may calculate the conversion result by counting the number of clock pulse on the OSC3 pin when DEEN is “high”. The conversion result is equal to (N /4) - 1/2 where N is the number of the pulse at the OSC3 pin. It is available in 44 pin package. n n n n n Component Value Selection Auto-Zero Capacitor (Caz) The Caz capacitor size has some influence on system noise. A 0.47 µF capacitor is recommended for 200 mV full-scale applications. A 0.047 µF capacitor is rec- ommended for 2.0V full-scale applications. A mylar dielectric capacitor is adequate. Reference Capacitor (Cref) A 0.1 µF capacitor is acceptable when “INLO” is tied to analog common. If a large common-mode voltage exists and the application requires 200 mV full-scale, increase Cref to 1.0 µF. A mylar dielectric capacitor is adequate. |
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Similar Description - AME811A |
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