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PDF AME7107A Data sheet ( Hoja de datos )
| Número de pieza | AME7107A | |
| Descripción | 3-1/2 Digit A/D Converter High Accuracy/ Low Power | |
| Fabricantes | Analog Microelectronics | |
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AME, Inc.
AME7106/AME7106A/AME7106R
AME7107/AME7107A/AME7107R
n Key Features
l 100µV Resolution
l High Impedance Differential Inputs
l Differential Reference
l Drive LCD (AME7106) or LED (AME7107)
Directly
l Four New Convenient Features
(AME7106A/AME7107A)
l Display-Hold
l Low-Battery Indication
l Integration Status Indication
l De-Integration Status Indication
n Applications
l Digital multimeter
l pH meter
l Capacitance meter
l Thermometer
l Digital Panel meter
l Photometer
3-1/2 Digit A/D Converter
High Accuracy, Low Power
n General Description
The AME7106 and AME7107 family are high perfor-
mance, low power, 3-1/2 digit, dual-slope integrating A/
D converters, with on-chip display drivers. The
AME7106 is designed for a single battery operated sys-
tem, will drive non-multiplexed LCD display directly.
The AME7107 is designed for a dual power supply sys-
tem, will directly drive common anode LED display.
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.
Display-hold, low-battery flag, integration and de-inte-
gration status flags are four additional features which
are available in the 44-pin package, AME7106ACKW
and AME7107ACKW.
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
1
1 page  
AME, Inc.
AME7106/AME7106A/AME7106R
AME7107/AME7107A/AME7107R
n Pin Configurations
3-1/2 Digit A/D Converter
High Accuracy, Low Power
5
5 Page 
AME, Inc.
AME7106/AME7106A/AME7106R
AME7107/AME7107A/AME7107R
Segment Drivers (AME7107)
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.
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.
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.
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 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
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AME7107A.PDF ] | |
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