AD626_03 [ADI]
Low Cost, Single-Supply Differential Amplifi er; 低成本，单电源差分功率放大器儿
| 型号： | AD626_03 |
| 厂家： | 
ADI |
| 描述： | Low Cost, Single-Supply Differential Amplifi er |
| 文件： | 总12页 (文件大小：339K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Low Cost, Single-Supply
Differential Amplifier
AD626
FEATURES
CONNECTION DIAGRAM
8-Lead Plastic Mini-DIP (N)
and SOIC (R) Packages
Pin Selectable Gains of 10 and 100
True Single-Supply Operation
Single-Supply Range of +2.4V to +10V
Dual-Supply Range of ؎1.2 V to ؎6V
Wide OutputVoltage Range of 30 mV to 4.7V
Optional Low-Pass Filtering
200k⍀
200k⍀
+IN
1
2
3
4
–IN
8
7
6
5
1/6
ANALOG
GND
Excellent DC Performance
G = 100
G = 30
Low Input OffsetVoltage: 500 V Max
Large Common-Mode Range: 0V to +54V
Low Power: 1.2 mW (VS = +5V)
Good CMR of 90 dBTyp
+V
S
–V
S
100k⍀
=
FILTER
G
2
OUT
AC Performance
AD626
Fast SettlingTime: 24 s (0.01%)
Includes Input Protection
Series Resistive Inputs (RIN = 200 k⍀)
RFI Filters Included
Allows 50V Continuous Overload
range of this amplifier is equal to 6 (+VS – 1V) which provides a
+24V CMR while operating from a +5V supply. Furthermore,
the AD626 features a CMR of 90 dB typ.
APPLICATIONS
Current Sensing
Interface for PressureTransducers, Position Indicators,
Strain Gages, and Other Low Level Signal Sources
The amplifier’s inputs are protected against continuous overload of
up to 50V, and RFI filters are included in the attenuator network.
The output range is +0.03V to +4.9V using a +5V supply.The
amplifier provides a preset gain of 10, but gains between 10 and
100 can be easily configured with an external resistor. Further-
more, 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.
PRODUCT DESCRIPTION
The AD626 is a low cost, true single-supply differential amplifier
designed for amplifying and low-pass filtering small differential
voltages from sources having a large common-mode voltage.
The AD626A and AD626B operate over the industrial temperature
range of –40°C to +85°C.The AD626 is available in two 8-lead
packages: a plastic mini-DIP and SOIC.
The AD626 can operate from either a single supply of +2.4V to
+10V, or dual supplies of 1.2V to 6V.The input common-mode
25
20
140
120
100
G = 10, 100
S
؎V
FOR SINGLE
CM
V
= +5V
15
10
5
80
60
40
20
0
AND DUAL SUPPLIES
G = 100
V
= ؎5V
S
G = 10
= ؎5V
V
S
؎V
FOR DUAL
CM
SUPPLIES ONLY
0
0.1
1
10
100
1k
10k
100k
1M
1
2
3
4
5
FREQUENCY – Hz
SUPPLY VOLTAGE – ؎V
Figure 2. Input Common-Mode Range vs. Supply
Figure 1. Common-Mode Rejection vs. Frequency
REV. D
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed byAnalog Devices for its
use, nor for any infringements of patents or other rights of third parties
that may result from its use. No license is granted by implication or other-
wise under any patent or patent rights ofAnalog Devices.Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© 2003 Analog Devices, Inc. All rights reserved.
AD626–SPECIFICATIONS
SINGLE SUPPLY (@+VS = +5 V and TA = 25؇C, unless otherwise noted.)
Model
AD626A
Typ
AD626B
Typ
Parameter
Condition
Min
Max
Min
Max
Unit
GAIN
Gain Accuracy
Total Error
Gain = 10
Gain = 100
OverTemperature,TA =TMIN toTMAX
@VOUT ≥ 100 mV dc
@VOUT ≥ 100 mV dc
G = 10
0.4
0.1
1.0
1.0
50
0.2
0.5
0.6
0.6
30
%
%
ppm/°C
ppm/°C
G = 100
150
120
Gain Linearity
Gain = 10
Gain = 100
@VOUT ≥ 100 mV dc
@VOUT ≥ 100 mV dc
0.014
0.014
0.016
0.02
0.014
0.014
0.016
0.02
%
%
OFFSETVOLTAGE
Input OffsetVoltage
vs.Temperature
vs.Temperature
vs. SupplyVoltage (PSR)
+PSR
1.9
2.5
2.9
6
1.9
2.5
2.9
6
mV
mV
µV/°C
TMIN toTMAX, G = 10 or 100
TMIN toTMAX, G = 10 or 100
74
64
80
66
74
64
80
66
dB
dB
–PSR
COMMON-MODE REJECTION
+CMR Gain = 10, 100
CMR Gain = 10, 100
–CMR Gain = 10, 100*
RL = 10 k⍀
f = 100 Hz,VCM = +24V
f = 10 kHz,VCM = +6V
f = 100 Hz,VCM = –2V
66
55
60
90
64
85
80
55
73
90
64
85
dB
dB
dB
COMMON-MODEVOLTAGE RANGE
+CMV Gain = 10
–CMV Gain = 10
CMR > 85 dB
CMR > 85 dB
+24
–2
+24
–2
V
V
INPUT
Input Resistance
Differential
Common-Mode
200
100
6 (VS – l)
200
100
6 (VS – l)
k⍀
k⍀
V
InputVoltage Range (Common-Mode)
OUTPUT
OutputVoltage Swing
Positive
RL = 10 k⍀
Gain = 10
Gain = 100
Gain = 10
Gain = 100
4.7
4.7
0.03
0.03
4.90
4.90
4.7
4.7
0.03
0.03
4.90
4.90
V
V
V
V
Negative
Short Circuit Current
+ISC
12
12
mA
NOISE
Voltage Noise RTI
Gain = 10
f = 0.1 Hz–10 Hz
f = 0.1 Hz–10 Hz
f = 1 kHz
2
2
0.25
0.25
2
2
0.25
0.25
µV p-p
µV p-p
Gain = 100
Gain = 10
Gain = 100
ͱ
µV/ Hz
ͱ
f = 1 kHz
µV/ Hz
DYNAMIC RESPONSE
–3 dB Bandwidth
Slew Rate,TMIN toTMAX
VOUT = +1V dc
Gain = 10
Gain = 100
100
0.22
0.17
24
100
0.22
0.17
22
kHz
V/µs
V/µs
µs
0.17
0.1
0.17
0.1
SettlingTime
to 0.01%, 1V Step
POWER SUPPLY
Operating Range
Quiescent Current
TA =TMIN toTMAX
Gain = 10
Gain = 100
2.4
5
0.16
0.23
12
0.20
0.29
2.4
5
0.16
0.23
10
0.20
0.29
V
mA
mA
TRANSISTOR COUNT
Number ofTransistors
46
46
*At temperatures above 25°C, –CMV degrades at the rate of 12 mV/°C; i.e., @ 25°C CMV = –2V, @ 85°C CMV = –1.28V.
Specifications subject to change without notice.
–2–
REV. D
AD626
(@+VS = ؎5 V and TA = 25؇C, unless otherwise noted.)
DUAL SUPPLY
Model
AD626A
Typ
AD626B
Typ
Parameter
Condition
Min
Max
Min
Max
Unit
GAIN
Gain Accuracy
Total Error
Gain = 10
Gain = 100
OverTemperature,TA =TMIN toTMAX
RL = 10 k⍀
0.2
0.25
0.5
1.0
50
0.1
0.15
0.3
0.6
30
%
%
ppm/°C
ppm/°C
G = 10
G = 100
100
80
Gain Linearity
Gain = 10
Gain = 100
0.045
0.01
0.055
0.015
0.045
0.01
0.055
0.015
%
%
OFFSETVOLTAGE
Input OffsetVoltage
vs.Temperature
vs.Temperature
vs. SupplyVoltage (PSR)
+PSR
50
500
1.0
50
250
0.5
µV
mV
µV/°C
TMIN toTMAX, G = 10 or 100
TMIN toTMAX, G = 10 or 100
1.0
0.5
74
64
80
66
74
64
80
66
dB
dB
–PSR
COMMON-MODE REJECTION
+CMR Gain = 10, 100
RL = 10 k⍀
f = 100 Hz,VCM = +24V
f = 10 kHz,VCM = 6V
66
55
90
60
80
55
90
60
dB
dB
CMR Gain = 10, 100
COMMON-MODEVOLTAGE RANGE
+CMV Gain = 10
–CMV Gain = 10
CMR > 85 dB
CMR > 85 dB
26.5
32.5
26.5
32.5
V
V
INPUT
Input Resistance
Differential
Common-Mode
200
110
6 (VS – l)
200
110
6 (VS – l)
k⍀
k⍀
V
InputVoltage Range (Common-Mode)
OUTPUT
OutputVoltage Swing
Positive
Negative
RL = 10 k⍀
Gain = 10, 100
Gain = 10
4.7
–1.65
–1.45
4.90
–2.1
–1.8
4.7
–1.65
–1.45
4.90
–2.1
–1.8
V
V
V
Gain = 100
Short Circuit Current
+ISC
–ISC
12
0.5
12
0.5
mA
mA
NOISE
Voltage Noise RTI
Gain = 10
f = 0.1 Hz–10 Hz
f = 0.1 Hz–10 Hz
f = 1 kHz
2
2
0.25
0.25
2
2
0.25
0.25
µV p-p
µV p-p
Gain = 100
Gain = 10
Gain = 100
ͱ
µV/ Hz
ͱ
f = 1 kHz
µV/ Hz
DYNAMIC RESPONSE
–3 dB Bandwidth
Slew Rate,TMIN toTMAX
VOUT = +1V dc
Gain = 10
Gain = 100
100
0.22
0.17
24
100
0.22
0.17
22
kHz
V/µs
V/µs
µs
0.17
0.1
0.17
0.1
SettlingTime
to 0.01%, 1V Step
POWER SUPPLY
Operating Range
Quiescent Current
TA =TMIN toTMAX
Gain = 10
Gain = 100
Ϯ1.2
Ϯ5
1.5
1.5
Ϯ6
2
2
Ϯ1.2
Ϯ5
1.5
1.5
Ϯ6
2
2
V
mA
mA
TRANSISTOR COUNT
Number ofTransistors
46
46
Specifications subject to change without notice.
REV. D
–3–
AD626
ABSOLUTE MAXIMUM RATINGS1
NOTES
1Stresses 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.
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +36V
Internal Power Dissipation2
Peak InputVoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +60V
Maximum Reversed SupplyVoltage Limit . . . . . . . . . . . . . –34V
Output Short Circuit Duration . . . . . . . . . . . . . . . . . . Indefinite
StorageTemperature Range (N, R) . . . . . . . . . –65°C to +125°C
OperatingTemperature Range
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.
AD626A/AD626B . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
LeadTemperature Range (Soldering 60 sec) . . . . . . . . . +300°C
ORDERING GUIDE
Temperature
Range
Package
Description
Package
Option
Model
AD626AN
AD626AR
AD626BN
AD626AR-REEL
AD626AR-REEL7
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Plastic DIP
Small Outline IC
Plastic DIP
13"Tape and Reel
7"Tape and Reel
N-8
R-8
N-8
METALLIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily accumulate
on the human body and test equipment and can discharge without detection.Although the AD626 features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
–4–
REV. D
Typical Performance Characteristics–AD626
25
20
15
10
5
6
V
= ؎5V
S
5
4
3
2
1
GAIN = 10, 100
؎V
FOR SINGLE
CM
AND DUAL SUPPLIES
؎V
FOR DUAL
CM
SUPPLIES ONLY
0
–1
0
1
2
3
4
5
10
100
1k
10k
LOAD RESISTANCE – ⍀
SUPPLY VOLTAGE – ؎V
TPC 1. Input Common-Mode Range vs. Supply
TPC 4. Positive Output Voltage Swing vs. Resistive Load
5
–6
–5
–4
T
= 25؇C
A
4
3
2
1
0
SINGLE AND
DUAL SUPPLY
–3
–2
–1
GAIN = 10
GAIN = 100
DUAL SUPPLY
ONLY
0
1
0
1
2
3
4
5
100
1k
10k
100k
SUPPLY VOLTAGE – V
LOAD RESISTANCE – ⍀
TPC 2. Positive Output Voltage Swing vs. Supply Voltage
TPC 5. Negative Output Voltage Swing vs. Resistive Load
–5
30
T
= 25؇C
A
–4
–3
–2
–1
0
20
10
0
DUAL SUPPLY
ONLY
0
1
2
3
4
5
0
1
2
3
4
5
SUPPLY VOLTAGE – V
WARM-UP TIME – Minutes
TPC 3. Negative Output Voltage Swing vs. Supply Voltage
TPC 6. Change in Input Offset Voltage vs. Warm-UpTime
REV. D
–5–
AD626
100
95
90
85
80
75
70
65
1000
V
= ؎5V
S
DUAL SUPPLY
GAIN = 100
GAIN = 10
100
10
0
V
= +5V
S
SINGLE SUPPLY
V
= ؎5
S
V
= ؎5V
DUAL SUPPLY
S
20
22
24
26
28
30
10
100
1k
10k
100k
1M
INPUT COMMON-MODE VOLTAGE – V
FREQUENCY – Hz
TPC 7. Closed-Loop Gain vs. Frequency
TPC 10. Common-Mode Rejection vs. Input
Common-Mode Voltage for Dual-Supply Operation
100
140
120
100
80
G = 10, 100
90
G = 10, 100
S
V
= +5
80
70
60
G = 100
= ؎5
V
S
60
40
G = 10
= ؎5
V
S
20
0
0.1
1
10
100
1k
10k
100k
1M
0
20
40
60
80
FREQUENCY – Hz
INPUT SOURCE RESISTANCE MISMATCH – ⍀
TPC 8. Common-Mode Rejection vs. Frequency
TPC 11. Common-Mode Rejection vs. Input Source
Resistance Mismatch
100
0.7
G = 10, 100
CURVE APPLIES TO
95
ALL SUPPLY VOLTAGES
0.6
AND GAINS BETWEEN 10 AND 100
90
85
80
0.5
TOTAL GAIN ERROR =
GAIN ACCURACY (FROM SPEC TABLE)
+ ADDITIONAL GAIN ERROR
0.4
0.3
0.2
V
= +5
S
75
70
65
0.1
0.0
–5
0
5
10
15
20
25
10
100
1k
INPUT COMMON-MODE VOLTAGE – V
SOURCE RESISTANCE MISMATCH – ⍀
TPC 9. Common-Mode Rejection vs. Input Common-
Mode Voltage for Single-Supply Operation
TPC 12. Additional Gain Error vs. Source
Resistance Mismatch
–6–
REV. D
AD626
0.16
0.15
0.14
0.13
0.12
G = 10
1
2
3
4
5
5 SECONDS PER HORIZONTAL DIVISION
SUPPLY VOLTAGE – V
TPC 13. Quiescent Supply Current vs. Supply Voltage
for Single-Supply Operation
TPC 16. 0.1 Hz to 10 Hz RTI Voltage Noise. VS = 5 V,
Gain = 100
2.0
100
80
1.5
1.0
0.5
0
FOR V = ؎5V AND +5V
S
60
40
20
0
؎1
؎2
؎3
؎4
؎5
1
10
100
1k
10k
100k
1M
SUPPLY VOLTAGE – V
VALUE OF RESISTOR R – ⍀
G
TPC 14. Quiescent Supply Current vs. Supply Voltage
for Dual-Supply Operation
TPC 17. Closed-Loop Gain vs. RG
10
140
ALL CURVES FOR
GAINS OF 10 OR 100
120
100
80
1.0
SINGLE AND DUAL
–PSRR
GAIN = 10, 100
60
0.1
SINGLE
+PSRR
V
= ؎5V DUAL SUPPLY
S
40
20
DUAL
+PSRR
0.01
1
10
100
1k
10k
100k
0.1
1
10
100
1k
10k
100k
1M
FREQUENCY – Hz
FREQUENCY – Hz
TPC 15. Noise Voltage Spectral Density vs. Frequency
TPC 18. Power Supply Rejection vs. Frequency
REV. D
–7–
AD626
100
100
90
90
10
10
0%
0%
TPC 19. Large Signal Pulse Response. VS = 5 V, G = 10
TPC 22. Large Signal Pulse Response. VS = +5 V, G = 100
100
90
100
90
10
10
0%
0%
TPC 20. Large Signal Pulse Response. VS = 5 V, G = 100
TPC 23. SettlingTime. VS = 5 V, G = 10
500mV
100
90
100
90
10
10
0%
0%
TPC 21. Large Signal Pulse Response. VS = +5 V, G = 10
TPC 24. SettlingTime. VS = 5 V, G = 100
–8–
REV. D
AD626
100
90
100
90
10
10
0%
0%
TPC 25. SettlingTime. VS = +5 V, G = 10
TPC 26. SettlingTime. VS = +5 V, G = 100
Figure 4 shows the main elements of the AD626.The signal inputs
at Pins 1 and 8 are first applied to dual resistive attenuators R1
through R4 whose purpose is to reduce the peak common-mode
voltage at the input to the preamplifier—a feedback stage based
on the very low drift op amp A1.This allows the differential
input voltage to be accurately amplified in the presence of large
common-mode voltages six times greater than that which can be
tolerated by the actual input to A1. As a result, the input CMR
extends to six times the quantity (VS – 1V).The overall common-
mode error is minimized by precise laser-trimming of R3 and R4,
thus giving the AD626 a common-mode rejection ratio (CMRR)
of at least 10,000:1 (80 dB).
ERROR
OUT
10k⍀
10k⍀
2k⍀
+V
S
10k⍀
1k⍀
INPUT
20V p–p
AD626
–V
S
Figure 3. SettlingTimeTest Circuit
THEORY OF OPERATION
To minimize the effect of spurious RF signals at the inputs due to
rectification at the input to A1, small filter capacitors C1 and C2
are included.
The AD626 is a differential amplifier consisting of a precision
balanced attenuator, a very low drift preamplifier (A1), and an
output buffer amplifier (A2). It has been designed so that small
differential signals can be accurately amplified and filtered in the
presence of large common-mode voltages (VCM), without the use
of any other active components.
The output of A1 is connected to the input of A2 via a 100 k⍀
(R12) resistor to facilitate the low-pass filtering of the signal of
interest (see Low-Pass Filtering section).
The 200 k⍀ input impedance of the AD626 requires that the source
resistance driving this amplifier be low in value (<1 k⍀)—this is
+V
S
FILTER
C1
5pF
AD626
R1
200k⍀
R12
100k⍀
+IN
–IN
A1
A2
OUT
R2
200k⍀
C2
5pF
R17
95k⍀
R3
41k⍀
R4
41k⍀
R15
10k⍀
R9
10k⍀
R5
4.2k⍀
R7
500⍀
R10
10k⍀
R13
10k⍀
R8
10k⍀
R14
R11
10k⍀
R6
500⍀
555⍀
GAIN = 100
–V
GND
S
Figure 4. Simplified Schematic
REV. D
–9–
AD626
+INPUT
–INPUT
necessary to minimize gain error. Also, any mismatch between the
total source resistance at each input will affect gain accuracy and
common-mode rejection (CMR). For example: when operating at
a gain of 10, an 80 ⍀ mismatch in the source resistance between
the inputs will degrade CMR to 68 dB.
200k⍀
200k⍀
+IN
–IN
1
2
3
8
7
6
5
1/6
ANALOG
GND
G = 100
The output buffer, A2, operates at a gain of 2 or 20, thus setting
the overall, precalibrated gain of the AD626 (with no external
components) at 10 or 100.The gain is set by the feedback network
around amplifier A2.
G = 30
–V
–V
S
+V
S
+V
S
S
0.1F
100k⍀
FILTER
0.1F
OUTPUT
OUT
The output of amplifier A2 relies on a 10 k⍀ resistor to –VS for
“pull-down.” For single-supply operation, (–VS = “GND”), A2
can drive a 10 k⍀ ground referenced load to at least +4.7V.The
minimum, nominally “zero,” output voltage will be 30 mV. For
dual-supply operation ( 5V), the positive output voltage swing
will be the same as for a single supply.The negative swing will be
to –2.5V, at G = 100, limited by the ratio:
4
G = 2
AD626
Figure 6. AD626 Configured for a Gain of 100
+INPUT
R15 + R14
–VS ×
200k⍀
200k⍀
+IN
–IN
–INPUT
1
2
3
4
8
7
6
5
R13 + R14 + R15
1/6
R
H
ANALOG
GND
The negative range can be extended to –3.3V (G = 100) and –4V
(G = 10) by adding an external 10 k⍀ pull-down from the output
to –VS. This will add 0.5 mA to the AD626’s quiescent current,
bringing the total to 2 mA.
G = 100
R
G
G = 30
–V
+V
–V
S
+V
S
S
S
100k⍀
FILTER
0.1F
0.1F
The AD626’s 100 kHz bandwidth at G = 10 and 100 (a 10 MHz
gain bandwidth) is much higher than can be obtained with low
power op amps in discrete differential amplifier circuits. Further-
more, the AD626 is stable driving capacitive loads up to 50 pF
(G10) or 200 pF (G100). Capacitive load drive can be increased
to 200 pF (G10) by connecting a 100 ⍀ resistor in series with the
AD626’s output and the load.
OUT
OUTPUT
G = 2
CF
FILTER
(OPTIONAL)
AD626
1
CORNER FREQUENCY OF FILTER =
2CF (100k⍀)
RESISTOR VALUES FOR GAIN ADJUSTMENT
GAIN RANGE
R
(⍀)
R (⍀)
G
H
ADJUSTINGTHE GAIN OFTHE AD626
4.99k
802
80
11 – 20
20 – 40
40 – 80
80 – 100
100k
10k
1k
The AD626 is easily configured for gains of 10 or 100. Figure 5
shows that for a gain of 10, Pin 7 is simply left unconnected; simi-
larly, for a gain of 100, Pin 7 is grounded, as shown in Figure 6.
2
100
Gains between 10 and 100 are easily set by connecting a variable
resistance between Pin 7 and Analog GND, as shown in Figure 7.
Because the on-chip resistors have an absolute tolerance of 20%
(although they are ratio matched to within 0.1%), at least a 20%
adjustment range must be provided.The values shown in the
table in Figure 7 provide a good trade-off between gain set range
and resolution, for gains from 11 to 90.
Figure 7. Recommended Circuit for Gain Adjustment
SINGLE-POLE LOW-PASS FILTERING
A low-pass filter can be easily implemented by using the features
provided by the AD626.
By simply connecting a capacitor between Pin 4 and ground,
a single-pole low-pass filter is created, as shown in Figure 8.
+INPUT
+INPUT
200k⍀
200k⍀
–IN
+IN
–INPUT
1
2
3
4
8
7
6
5
200k⍀
200k⍀
+IN
–IN
–INPUT
1
2
3
4
8
7
6
5
1/6
NOT
1/6
ANALOG
GND
G = 10
CONNECTED
ANALOG
GND
G = 100
G = 30
G = 30
–V
S
+V
S
–V
+V
S
S
+10V
0.1F
–V
S
+V
S
0.1F
100k⍀
0.1F
100k⍀
FILTER
OUT
FILTER
OUTPUT
G = 2
OUT
OUTPUT
G = 2
AD626
CF
AD626
1
Figure 5. AD626 Configured for a Gain of 10
CORNER FREQUENCY OF FILTER =
2CF (100k⍀)
Figure 8. A One-Pole Low-Pass Filter Circuit
Which Operates from a Single +10 V Supply
–10–
REV. D
AD626
CURRENT SENSOR INTERFACE
BRIDGE APPLICATION
A typical current sensing application, making use of the large
common-mode range of the AD626, is shown in Figure 9.The
current being measured is sensed across resistor RS. The value of
RS should be less than 1 k⍀ and should be selected so that the
average differential voltage across this resistor is typically 100 mV.
Figure 10 shows the AD626 in a typical bridge application. Here,
the AD626 is set to operate at a gain of 100, using dual-supply
voltages and offering the option of low-pass filtering.
+V
S
To produce a full-scale output of +4V, a gain of 40 is used adjust-
able by 20% to absorb the tolerance in the sense resistor. Note
that there is sufficient headroom to allow at least a 10% overrange
(to +4.4V).
200k⍀
200k⍀
+IN
–IN
1
2
3
4
8
7
6
5
1/6
ANALOG
GND
G = 100
G = 30
CURRENT IN
CURRENT
–5V
0.1F
–V
S
+V
S
+5V
0.1F
R
S
SENSOR
CURRENT OUT
100k⍀
FILTER
200k⍀
200k⍀
+IN
–IN
1
2
3
4
8
7
6
5
OUT
CF
OPTIONAL
LOW-PASS
FILTER
OUTPUT
G = 2
1/6
R
AD626
H
ANALOG
GND
G = 100
R
G
G = 30
Figure 10. ATypical Bridge Application
–V
+V
–V
S
+V
S
S
S
100k⍀
FILTER
0.1F
0.1F
OUT
CF
OPTIONAL
LOW-PASS
FILTER
OUTPUT
G = 2
AD626
Figure 9. Current Sensor Interface
REV. D
–11–
AD626
OUTLINE DIMENSIONS
8-Lead Standard Small Outline Package [SOIC]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
5.00 (0.1968)
4.80 (0.1890)
8
1
5
4
6.20 (0.2440)
5.80 (0.2284)
4.00 (0.1574)
3.80 (0.1497)
1.27 (0.0500)
BSC
0.50 (0.0196)
0.25 (0.0099)
؋
45؇ 1.75 (0.0688)
1.35 (0.0532)
0.25 (0.0098)
0.10 (0.0040)
8؇
0؇
0.51 (0.0201)
0.33 (0.0130)
1.27 (0.0500)
0.41 (0.0160)
COPLANARITY
0.10
0.25 (0.0098)
0.19 (0.0075)
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MS-012AA
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
8-Lead Plastic Dual-In Line Package [PDIP]
(N-8)
Dimensions shown in inches and (millimeters)
0.375 (9.53)
0.365 (9.27)
0.355 (9.02)
8
1
5
0.295 (7.49)
0.285 (7.24)
0.275 (6.98)
4
0.325 (8.26)
0.310 (7.87)
0.300 (7.62)
0.100 (2.54)
BSC
0.150 (3.81)
0.135 (3.43)
0.120 (3.05)
0.015
(0.38)
MIN
0.180
(4.57)
MAX
0.015 (0.38)
0.010 (0.25)
0.008 (0.20)
0.150 (3.81)
0.130 (3.30)
0.110 (2.79)
0.022 (0.56)
0.018 (0.46)
0.014 (0.36)
SEATING
PLANE
0.060 (1.52)
0.050 (1.27)
0.045 (1.14)
COMPLIANT TO JEDEC STANDARDS MO-095AA
CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
Revision History
Location
Page
1/03—Data Sheet changed from REV. C to REV. D.
Renumbered Figures andTPCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Universal
Edits to Figure 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Edits to SPECIFICATIONS, Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Edit to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Update to standard CAUTION/ESDWarning note and diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Edits toTPC 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
–12–
REV. D
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