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AME811A Datasheet(PDF) 10 Page - Analog Microelectronics

Part # AME811A
Description  3-1/2 Digit A/D Converter - Low Power With HOLD And Differential Reference Inputs
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Manufacturer  AME [Analog Microelectronics]
Direct Link  http://www.ame.com.tw/
Logo AME - Analog Microelectronics

AME811A Datasheet(HTML) 10 Page - Analog Microelectronics

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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
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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