Analog Microelectronics, Inc.
AME811/AME811A/AME811R
3-1/2 Digit A/D Converter - Low Power
With HOLD And Differential Reference Inputs
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Key Features
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100µV Resolution
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High Impedance Differential Inputs
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Differential Reference
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Drive LCD Directly
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Three New Convenient Features
(AME811A Only)
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Low-Battery Indication
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Integration Status Indication
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De-Integration Status Indication
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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.
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Applications
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Digital multimeter
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pH meter
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Capacitance meter
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Thermometer
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Digital Panel meter
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Photometer
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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.
0.1
35
34
C
REF+
C
REF-
31
30
32
IN HI
IN LO
CO M
2-19
SEGMENT
22-25
DRIVE
PO L
BP
V+
20
21
38
24K
BUF
A/Z
V
REF+
V
REF-
36 V
REF
33
9V
1K
MINUS SIGN
BACKPLANE
D RIVE
LCD DISPLAY
1M
AN ALOG
INPUT
0.01
28
47K
0.22
0.47
29
27
V- 26
INT
O SC
2
OSC
1
39
40
20M
V+
TO ANALO G
COM MON (P32)
470K
V+
20pF
40KHz
10pF
FULL SCALE IN PUT 200.0mV
V
REF
100.0mV
1
AME [ ANALOG MICROELECTRONICS ]
