AME, Inc.
AME7106/AME7106A/AME7106R
AME7107/AME7107A/AME7107R
Segment Drivers (AME7107)
3-1/2 Digit A/D Converter
High Accuracy, Low Power
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.
The AME7107 is designed to drive common anode
LEDs. All segment drivers are N-channel transistors
with a typically 8 mA current driving capability. The
1000’s segment AB4 sinks current from two LED seg-
ments, and has a 16 mA driving capability. The polar-
ity indication is “on” when the analog input voltage is
negative.
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.
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 500Ω
resistor in the AME7106. It is typically 5V lower than
V+. TEST pin may be used as the negative power sup-
ply 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. It is available in 44 pin
package.
n
Component Value Selection
Auto-Zero Capacitor (Caz)
The Caz capacitor size has some influence on system
noise. A 0.47µF capacitor is recommended for 200
mV full-scale applications. A 0.047µF capacitor is
recommended for 2.0V full-scale applications. A mylar
dielectric capacitor is adequate.
Reference Capacitor (Cref)
A 0.1µF capacitor is acceptable when “INLO” is tied
to analog common. If a large common-mode voltage
11
AME [ ANALOG MICROELECTRONICS ]
