Analog Microelectronics, Inc.
AME811/AME811A/AME811R
3-1/2 Digit A/D Converter - Low Power
With HOLD And Differential Reference Inputs
n
Key Features
l
100µV Resolution
l
High Impedance Differential Inputs
l
Differential Reference
l
Drive LCD Directly
l
Three New Convenient Features
(AME811A Only)
l
Low-Battery Indication
l
Integration Status Indication
l
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
l
Digital multimeter
l
pH meter
l
Capacitance meter
l
Thermometer
l
Digital Panel meter
l
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
Analog Microelectronics, Inc.
AME811/AME811A/AME811R
3-1/2 Digit A/D Converter - Low Power
With HOLD And Differential Reference Inputs
n
Absolute Maximum Ratings
AME811
Supply Voltage (V+ to V-)
Analog Input Voltage (Either inputs)
Reference Input Voltage (Either inputs)
Clock Input
Power Dissipation
Operating Temperature
Storage Temperature
Lead Temperature (Soldering 60 seconds )
12V
V+ to V-
V+ to V-
Test to V+
800mW
0
o
C to 70
o
C
-55
o
C to 150
o
C
300
o
C
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
Part Number
AME811CPL
AME811RCPL
AME811ACKW
Display
LCD
LCD
LCD
Marking
AME811CPL
YYWW
AME811RCPL
YYWW
AME811ACKW
YYWW
Package
40 Pin PDIP
40 Pin PDIP
44 Pin PQFP
Pin Layout
Normal
Reverse
Normal
Temp.Range
0
o
C to 70
o
C
0
o
C to 70
o
C
0
o
C to 70
o
C
2
Analog Microelectronics, Inc.
AME811/AME811A/AME811R
3-1/2 Digit A/D Converter - Low Power
With HOLD And Differential Reference Inputs
n
Electrical Characteristics
Parameter
Zero Input Reading
Ratiometric 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
Rejection Ratio
Noise (Pk-Pk Value Not
Exceeded 95% of Time)
Leakage Current at Input
Zero Reading Drift
Analog Common Voltage
(With respect to V+)
o
Unless otherwise noted, AME811 is specified at TA = 25 C, fclock = 48KHz. Supply voltage = 9V (V+ to V-)
Conditions
Vin = 0V
Full-Scale = 200.0mV
Vin = Vref = 100.0mV
Min
-0
Typ
w0
Max
Unit
+0 Digital Reading
999 999/1000 1000 Digital Reading
–0.2
+1
Counts
-Vin = +Vin
≈
200.0mV -1
Full-Scale = 200.0mV
Vcm = –1V, Vin =0V
Full-Scale = 200.0mV
Vin = 0V
Full-Scale = 200.0mV
Vin = 0V
Vin = 0V, 0 C to 70 C
25KΩ Between
Common and V+
o
o
-1
–0.2
50
15
1
0.2
+1
Counts
µV/V
µV
10
1
3.2
pA
µV/
C
V
o
o
2.8
3
Temp. Coeff. of Analog
25KΩ Between
Common (With respect to V+) Common and V+
Low Battery Flag
Test Pin Voltage
LCD Segment Drive Voltage
Backplane Drive Voltage
0 C m T
A
m 70 C
V+ to V-
With respect to V+
V+ to V- = 9V
V+ to V- = 9V
o
o
50
6.3
4
4
4
7.0
5
5
5
75
7.7
6
6
6
ppm/ C
V
V
V
V
Notes: 1. Input voltage may exceed the supply voltages provided the input current is limited to
±100µA.
2. Dissipation rating assumes a device is mounted with all leads soldered to printed circuit board.
3
Analog Microelectronics, Inc.
AME811/AME811A/AME811R
3-1/2 Digit A/D Converter - Low Power
With HOLD And Differential Reference Inputs
n
Pin Configurations
4
Analog Microelectronics, Inc.
AME811/AME811A/AME811R
3-1/2 Digit A/D Converter - Low Power
With HOLD And Differential Reference Inputs
n
Pin Description
40-pin DIP 40-pin DIP 44-pin PQFP Symbol
Pin Number (Reverse) Pin Number
1
(40)
8
HOLD
2
(39)
9
D1
3
(38)
10
C1
4
(37)
11
B1
5
(36)
12
A1
6
(35)
13
F1
7
(34)
14
G1
8
(33)
15
E1
9
(32)
16
D2
10
(31)
17
C2
11
(30)
18
B2
12
(29)
19
A2
13
(28)
20
F2
14
(27)
21
E2
15
(26)
22
D3
16
(25)
23
B3
17
(24)
24
F3
18
(23)
25
E3
19
(22)
26
AB4
20
(21)
27
POL
21
(20)
28
BP
22
(19)
29
G3
23
(18)
30
A3
24
(17)
31
C3
25
(16)
32
G2
¢w
33
LB
26
(15)
34
V-
27
(14)
35
INT
28
29
30
31
32
33
(13)
(12)
(11)
(10)
(9)
(8)
36
37
38
39
40
41
BUF
A/Z
INLO
INHI
COM
VREF-
Description
HOLD pin, Logic 1, Holds Display
Units-digit D-segment driver
Units-digit C-segment driver
Units-digit B-segment driver
Units-digit A-segment driver
Units-digit F-segment driver
Units-digit G-segment driver
Units-digit E-segment driver
Tens-digit D-segment driver
Tens-digit C-segment driver
Tens-digit B-segment driver
Tens-digit A-segment driver
Tens-digit F-segment driver
Tens-digit E-segment driver
Hundreds-digit D-segment driver
Hundreds-digit B-segment driver
Hundreds-digit F-segment driver
Hundreds-digit E-segment driver
Thousands-digit, B&C segments driver
Negative-polarity driver
LCD backplane driver
Hundreds-digit G-segment driver
Hundreds-digit A-segment driver
Hundreds-digit C-segment driver
Tens-digit G-segment driver
Low-battery flag segment driver
Negative power supply voltage
Integrator output. Connection point for
integration capacitor.
Integrator resistor connection-point.
Auto-zero capacitor connection-point
Analog-input low
Analog-input high
Analog-common
Analog-reference input, negative terminal
5
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