Analog Microelectronics, Inc.
1
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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100
V 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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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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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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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.
AN ALOG
C
REF+
V
REF+
V
REF-
V
REF
C
REF-
INPUT
IN HI
LCD DISPLAY
SEGMENT
DRIVE
IN LO
PO L
BP
V+
CO M
MINUS SIGN
BACKPLANE
D RIVE
BUF
A/Z
INT
V
REF
FULL SCALE IN PUT
200.0mV
100.0mV
TO ANALO G
COM MON (P32)
V-
O SC
OSC
2
1
35
31
2-19
22-25
30
20
21
38
36
9V
33
26
40
39
20pF
10pF
V+
V+
32
28
29
27
34
1M
47K
24K
1K
0.01
0.1
0.47
0.22
20M
40KHz
470K
Analog Microelectronics, Inc.
2
AME811/AME811A/AME811R
3-1/2 Digit A/D Converter - Low Power
With HOLD And Differential Reference Inputs
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Absolute Maximum Ratings
AME811
Static sensitive device. Unused devices must be stored in the conductive material.
Protect device from static discharge and static field. Stresses exceed the above Absolute Maximum
Ratings may cause permanent damage to the device. Exposure to Absolute Maximum Rating Conditions
for extended periods may affect the reliability of the device.
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Ordering Information
Supply V oltage (V+ to V-)
12V
Analog Input V oltage (Either inputs)
V+ to V-
Reference Input V oltage (Either inputs)
V+ to V-
Clock Input
Test to V +
Power Dis sipation
800m W
Operating Tem perature
0
o
C to 70
o
C
Storage Tem perature
-55
o
C to 150
o
C
Lead Tem perature (S oldering 60 seconds )
300
o
C
Part Number
Display
Marking
Package
Pin Layout
Temp.Range
AME811CPL
LCD
AME811CPL
YYWW
40 Pin PDIP
Normal
0
o
C to 70
o
C
AME811RCPL
LCD
AME811RCPL
YYWW
40 Pin PDIP
Reverse
0
o
C to 70
o
C
AME811ACKW
LCD
AME811ACKW
YYWW
44 Pin PQFP
Normal
0
o
C to 70
o
C
Analog Microelectronics, Inc.
3
AME811/AME811A/AME811R
3-1/2 Digit A/D Converter - Low Power
With HOLD And Differential Reference Inputs
Notes: 1. Input voltage may exceed the supply voltages provided the input current is limited to
100
A.
2. Dissipation rating assumes a device is mounted with all leads soldered to printed circuit board.
Parameter
Conditions
Min
Typ
Max
Unit
Vin = 0V
-0
w 0
+0 Digital Reading
Full-Scale = 200.0mV
Ratiometric Reading
Vin = Vref = 100.0mV
999 999/1000 1000 Digital Reading
Roll-Over Error
(Difference in Reading for
Equal Positive and Negative
Reading Near Full-Scale)
Linearity (Max. Deviation
From Best Straight Line Fit)
Common-Mode
Vcm = 1V, Vin =0V
Rejection Ratio
Full-Scale = 200.0mV
Noise (Pk-Pk Value Not
Vin = 0V
Exceeded 95% of Time)
Full-Scale = 200.0mV
Leakage Current at Input
Vin = 0V
1
10
pA
Zero Reading Drift
Vin = 0V, 0
o
C to 70
o
C
0.2
1
V/
o
C
Analog Common Voltage
25K
Between
(With respect to V+)
Common and V+
Temp. Coeff. of Analog
25K
Between
Common (With respect to V+) Common and V+
0
o
C m T
A
m 70
o
C
Low Battery Flag
V+ to V-
6.3
7.0
7.7
V
Test Pin Voltage
With respect to V+
4
5
6
V
LCD Segment Drive Voltage
V+ to V- = 9V
4
5
6
V
Backplane Drive Voltage
V+ to V- = 9V
4
5
6
V
Counts
+1
0.2
-1
V
V/V
-1
0.2
+1
Counts
50
V
50
75
ppm/
o
C
Zero Input Reading
2.8
3
3.2
15
-Vin = +Vin
200.0mV
Full-Scale = 200.0mV
Unless otherwise noted, AME811 is specified at TA = 25
o
C, fclock = 48KHz. Supply voltage = 9V (V+ to V-)
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Electrical Characteristics
Analog Microelectronics, Inc.
4
AME811/AME811A/AME811R
3-1/2 Digit A/D Converter - Low Power
With HOLD And Differential Reference Inputs
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Pin Configurations
Analog Microelectronics, Inc.
5
AME811/AME811A/AME811R
3-1/2 Digit A/D Converter - Low Power
With HOLD And Differential Reference Inputs
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Pin Description
40-pin DIP
40-pin DIP 44-pin PQFP Symbol
Description
Pin Number (Reverse) Pin Number
1
(40)
8
HOLD
HOLD pin, Logic 1, Holds Display
2
(39)
9
D1
Units-digit D-segment driver
3
(38)
10
C1
Units-digit C-segment driver
4
(37)
11
B1
Units-digit B-segment driver
5
(36)
12
A1
Units-digit A-segment driver
6
(35)
13
F1
Units-digit F-segment driver
7
(34)
14
G1
Units-digit G-segment driver
8
(33)
15
E1
Units-digit E-segment driver
9
(32)
16
D2
Tens-digit D-segment driver
10
(31)
17
C2
Tens-digit C-segment driver
11
(30)
18
B2
Tens-digit B-segment driver
12
(29)
19
A2
Tens-digit A-segment driver
13
(28)
20
F2
Tens-digit F-segment driver
14
(27)
21
E2
Tens-digit E-segment driver
15
(26)
22
D3
Hundreds-digit D-segment driver
16
(25)
23
B3
Hundreds-digit B-segment driver
17
(24)
24
F3
Hundreds-digit F-segment driver
18
(23)
25
E3
Hundreds-digit E-segment driver
19
(22)
26
AB4
Thousands-digit, B&C segments driver
20
(21)
27
POL
Negative-polarity driver
21
(20)
28
BP
LCD backplane driver
22
(19)
29
G3
Hundreds-digit G-segment driver
23
(18)
30
A3
Hundreds-digit A-segment driver
24
(17)
31
C3
Hundreds-digit C-segment driver
25
(16)
32
G2
Tens-digit G-segment driver
w
33
LB
Low-battery flag segment driver
26
(15)
34
V-
Negative power supply voltage
27
(14)
35
INT
Integrator output. Connection point for
integration capacitor.
28
(13)
36
BUF
Integrator resistor connection-point.
29
(12)
37
A/Z
Auto-zero capacitor connection-point
30
(11)
38
INLO
Analog-input low
31
(10)
39
INHI
Analog-input high
32
(9)
40
COM
Analog-common
33
(8)
41
VREF-
Analog-reference input, negative terminal
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