CONNECTION DIAGRAM
8-Lead Plastic Mini-DIP (N)
and SOIC (SO) Packages
1
2
3
4
8
7
6
5
AD626
1/6
200k
IN
ANALOG
GND
V
S
FILTER
+IN
G = 100
OUT
+V
S
100k
G = 2
G = 30
200k
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
Low Cost, Single Supply
Differential Amplifier
AD626
FEATURES
Pin Selectable Gains of 10 and 100
True Single Supply Operation
Single Supply Range of +2.4 V to +10 V
Dual Supply Range of 1.2 V to 6 V
Wide Output Voltage Range of 30 mV to 4.7 V
Optional Low-Pass Filtering
Excellent DC Performance
Low Input Offset Voltage: 500 V max
Large Common-Mode Range: 0 V to +54 V
Low Power: 1.2 mW (V
S
= +5 V)
Good CMR of 90 dB typ
AC Performance
Fast Settling Time: 24 s (0.01%)
Includes Input Protection
Series Resistive Inputs (R
IN
= 200 k )
RFI Filters Included
Allows 50 V Continuous Overload
APPLICATIONS
Current Sensing
Interface for Pressure Transducers, Position Indicators,
Strain Gages, and Other Low Level Signal Sources
PRODUCT DESCRIPTION
The AD626 is a low cost, true single supply differential ampli-
fier designed for amplifying and low-pass filtering small differen-
tial voltages from sources having a large common-mode voltage.
The AD626 can operate from either a single supply of +2.4 V to
+10 V, or dual supplies of
1.2 V to
6 V. The input common-
mode range of this amplifier is equal to 6 (+V
S
1 V) which
provides a +24 V CMR while operating from a +5 V supply.
Furthermore, the AD626 features a CMR of 90 dB typ.
The amplifier's inputs are protected against continuous overload
of up to 50 V, and RFI filters are included in the attenuator
network. The output range is +0.03 V to +4.9 V using a +5 V
supply. The amplifier provides a preset gain of 10, but gains be-
tween 10 to 100 can be easily configured with an external resis-
tor. Furthermore, a gain of 100 is available by connecting the G
= 100 pin to analog ground. The AD626 also offers low-pass
filter capability by connecting a capacitor between the filter pin
and analog ground.
The AD626A and AD626B operate over the industrial tempera-
ture range of 40
C to +85
C. The AD626 is available in two
8-lead packages: a plastic mini-DIP and SOIC.
160
0
1M
60
20
1
40
0.1
140
80
100
100k
10k
1k
100
10
FREQUENCY Hz
CMRR dB
G = 10,100
V
S
= +5V
G = 100
V
S
= 5V
G = 10
V
S
= 5V
Common-Mode Rejection vs. Frequency
25
0
5
15
5
2
10
1
20
4
3
POWER SUPPLY VOLTAGE Volts
INPUT COMMON MODE RANGE Volts
V
CM
FOR SINGLE
AND DUAL SUPPLIES
V
CM
FOR DUAL
SUPPLIES ONLY
Input Common-Mode Range vs. Supply
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1999
AD626SPECIFICATIONS
REV. C
2
(@ +V
S
= +5 V and T
A
= +25 C)
SINGLE SUPPLY
Model
AD626A
AD626B
Parameter
Condition
Min Typ
Max
Min Typ
Max
Units
GAIN
Gain Accuracy
Total Error
Gain = 10
@ V
OUT
100 mV dc
0.4
1.0
0.2
0.6
%
Gain = 100
@ V
OUT
100 mV dc
0.1
1.0
0.5
0.6
%
Over Temperature, T
A
= T
MIN
T
MAX
G = 10
50
30
ppm/
C
G = 100
150
120
ppm/
C
Gain Linearity
Gain = 10
@ V
OUT
100 mV dc
0.014
0.016
0.014
0.016
%
Gain = 100
@ V
OUT
100 mV dc
0.014
0.02
0.014
0.02
%
OFFSET VOLTAGE
Input Offset Voltage
1.9
2.5
1.9
2.5
mV
vs. Temperature
T
MIN
T
MAX
, G = 10 or 100
2.9
2.9
mV
vs. Temperature
T
MIN
T
MAX
, G = 10 or 100
6
6
V/
C
vs. Supply Voltage (PSR)
+PSR
74
80
74
80
dB
PSR
64
66
64
66
dB
COMMON-MODE REJECTION
R
L
= 10 k
+CMR Gain = 10, 100
f = 100 Hz, V
CM
= +24 V
66
90
80
90
dB
CMR Gain = 10, 100
f = 10 kHz, V
CM
= 6 V
55
64
55
64
dB
CMR Gain = 10, 100
1
f = 100 Hz, V
CM
= 2 V
60
85
73
85
dB
COMMON-MODE VOLTAGE RANGE
+CMV Gain = 10
CMR > 85 dB
+24
+24
V
CMV Gain = 10
CMR > 85 dB
2
2
V
INPUT
Input Resistance
Differential
200
200
k
Common Mode
100
100
k
Input Voltage Range (Common Mode)
6 (V
S
l)
6 (V
S
l)
V
OUTPUT
Output Voltage Swing
R
L
= 10 k
Positive
Gain = 10
4.7
4.90
4.7
4.90
V
Gain = 100
4.7
4.90
4.7
4.90
V
Negative
Gain = 10
0.03
0.03
V
Gain = 100
0.03
0.03
V
Short Circuit Current
+I
SC
12
12
mA
NOISE
Voltage Noise RTI
Gain = 10
f = 0.1 Hz10 Hz
2
2
V p-p
Gain = 100
f = 0.1 Hz10 Hz
2
2
V p-p
Gain = 10
f = 1 kHz
0.25
0.25
V/
Hz
Gain = 100
f = 1 kHz
0.25
0.25
V/
Hz
DYNAMIC RESPONSE
3 dB Bandwidth
V
OUT
= +1 V dc
100
100
kHz
Slew Rate, T
MIN
to T
MAX
Gain = 10
0.17 0.22
0.17 0.22
V/
s
Gain = 100
0.1
0.17
0.1
0.17
V/
s
Settling Time
to 0.01%, 1 V Step
24
22
s
POWER SUPPLY
Operating Range
T
A
= T
MIN
T
MAX
2.4
5
12
2.4
5
10
V
Quiescent Current
Gain = 10
0.16
0.20
0.16
0.20
mA
Gain = 100
0.23
0.29
0.23
0.29
mA
TRANSISTOR COUNT
# of Transistors
46
46
NOTES
1
At temperatures above +25
C, CMV degrades at the rate of 12 mV/
C; i.e., @ +25
C CMV = 2 V, @ +85
C CMV = 1.28 V.
Specifications subject to change without notice.
AD626
REV. C
4
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+36 V
Internal Power Dissipation
2
Peak Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 V
Maximum Reversed Supply Voltage Limit . . . . . . . . . . . . 34 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range (N, R) . . . . . . . . 65
C to +125
C
Operating Temperature Range
AD626A/B . . . . . . . . . . . . . . . . . . . . . . . . . 40
C to +85
C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300
C
METALIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).
ORDERING GUIDE
Temperature
Package
Package
Model
Range
Descriptions
Options
AD626AN
40
C to +85
C
Plastic DIP
N-8
AD626AR
40
C to +85
C
Small Outline IC
SO-8
AD626BN
40
C to +85
C
Plastic DIP
N-8
AD626AR-REEL
40
C to +85
C
13" Tape and Reel
AD626AR-REEL7
40
C to +85
C
7" Tape and Reel
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause permanent
damage to the device. This is a stress rating only; functional operation of the device
at these or any other conditions above those indicated in the operational section of
this specification is not implied. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
2
8-Lead Plastic Package:
JA
= 100
C/W,
JC
= 50
C/W.
8-Lead SOIC Package:
JA
= 155
C/W,
JC
= 40
C/W.
ESD SUSCEPTIBILITY
An ESD classification per method 3015.6 of MIL STD 883C
has been performed on the AD626, which is a Class 1 device.
25
0
5
15
5
2
10
1
20
4
3
SUPPLY VOLTAGE Volts
INPUT COMMON MODE RANGE Volts
V
CM
FOR SINGLE
AND DUAL SUPPLIES
V
CM
FOR DUAL
SUPPLIES ONLY
Figure 1. Input Common-Mode Range vs. Supply
SUPPLY VOLTAGE Volts
POSITIVE OUTPUT VOLTAGE SWING Volts
5
0
5
3
1
1
2
0
4
4
3
2
DUAL SUPPLY
ONLY
SINGLE AND
DUAL SUPPLY
T
A
= +25 C
Figure 2. Positive Output Voltage Swing vs. Supply Voltage
SUPPLY VOLTAGE Volts
NEGATIVE OUTPUT VOLTAGE SWING Volts
5
0
5
3
1
1
2
0
4
4
3
2
DUAL SUPPLY
ONLY
T
A
= +25 C
Figure 3. Negative Output Voltage Swing vs. Supply
Voltage
6
1
1
10
100
10k
1k
4
0
2
3
5
LOAD RESISTANCE
POSITIVE OUTPUT VOLTAGE Volts
V
S
= 5V
GAIN = 10, 100
Figure 4. Positive Output Voltage Swing vs. Resistive Load
6
1
1
100
1k
100k
10k
4
0
2
3
5
LOAD RESISTANCE
NEGATIVE OUTPUT VOLTAGE Volts
GAIN = 10
GAIN = 100
Figure 5. Negative Output Voltage Swing vs. Resistive Load
30
0
0
5
20
10
1
4
3
2
WARM-UP TIME Minutes
CHANGE IN OFFSET VOLTAGE
V
Figure 6. Change in Input Offset Voltage vs. Warm-Up
Time
Typical Performance CharacteristicsAD626
REV. C
5
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