Analog Devices AD626 d Datasheet

Low Cost, Single-Supply

Differential Amplifi er

AD626

FEATURES
Pin Selectable Gains of 10 and 100
Tr ue Single-Supply Operation

Single-Supply Range of +2.4 V to +10 V
Dual-Supply Range of ⴞ1.2 V to ⴞ6 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

= +5 V)

S

Good CMR of 90 dB Typ
AC Performance

Fast Settling Time: 24 ␮s (0.01%)
Includes Input Protection

Series Resistive Inputs (R

= 200 k⍀)

IN

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

PROD UCT DE SCRIP TION

The AD626 is a low cost, true sin gle-sup ply dif fer en tial am pli fi er
de signed for am pli fy ing and low-pass fi ltering small dif fer en 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

CONNECTION DIAGRAM

8-Lead Plastic Mini-DIP (N)

and SOIC (R) Packages

200k⍀

1

–IN

ANALOG

GND

–V

FILTER

2

3

S

100k⍀

4

AD626

range of this amplifi er is equal to 6 (+V

1/6

G = 30

G

200k⍀

=

2

S

+IN

8

7

G = 100

+V

6

S

5

OUT

– 1 V) which pro vides a
+24 V CMR while operating from a +5 V sup ply. Fur ther more,
the AD626 features a CMR of 90 dB typ.

The amplifi er’s inputs are protected against continuous overload of
up to 50 V, and RFI fi lters are included in the attenuator network.
The output range is +0.03 V to +4.9 V using a +5 V sup ply. The
amplifi er provides a preset gain of 10, but gains be tween 10 and
100 can be easily con fi g ured with an external re sis tor. Fur ther ­more, a gain of 100 is available by connecting the G = 100 pin to
analog ground. The AD626 also offers low-pass fi lter capability by
connecting a ca pac i tor between the fi lter pin and analog ground.

The AD626A and AD626B operate over the industrial tem per a ture
range of –40°C to +85°C. The AD626 is available in two 8-lead
packages: a plastic mini-DIP and SOIC.

140

120

100

80

60

40

COMMON-MODE REJECTION – dB

20

0

1

0.1
FREQUENCY – Hz

G = 10, 100
V

= +5V

S

G = 100
V

= ⴞ5V

S

G = 10
V

= ⴞ5V

S

100k10k 1k100 10

1M

Figure 1. Common-Mode Rejection vs. Frequency

REV. D

Information furnished by Analog Devices is be lieved 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
that may result from its use. No license is granted by implication or other­wise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.

25

20

15

10

5

INPUT COMMON-MODE RANGE – V

0

1

ⴞVCM FOR SINGLE
AND DUAL SUPPLIES

ⴞVCM FOR DUAL
SUPPLIES ONLY

2

SUPPLY VOLTAGE – ⴞV

3

4

5

Figure 2. Input Common-Mode Range vs. Supply

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © 2003 Analog Devices, Inc. All rights reserved.

AD626–SPECIFICATIONS

冑
冑

SINGLE SUPPLY

(@+VS = +5 V and TA = 25ⴗC, un less oth er wise noted.)

Model AD626A AD626B
Parameter Condition Min Typ Max Min Typ Max Unit

GAIN
Gain Accuracy Total Error
Gain = 10 @ V
Gain = 100 @ V

= T

Over Temperature, T

MIN

to T

A

G = 10 50 30 ppm/°C

MAX

≥ 100 mV dc 0.4 1.0 0.2 0.6 %

OUT

≥ 100 mV dc 0.1 1.0 0.5 0.6 %

OUT

G = 100 150 120 ppm/°C
Gain Linearity
Gain = 10 @ V
Gain = 100 @ V

≥ 100 mV dc 0.014 0.016 0.014 0.016 %

OUT

≥ 100 mV dc 0.014 0.02 0.014 0.02 %

OUT

OFFSET VOLTAGE
Input Offset Voltage 1.9 2.5 1.9 2.5 mV
vs. Temperature T
vs. Temperature T

MIN

MIN

to T
to T

, G = 10 or 100 2.9 2.9 mV

MAX

, G = 10 or 100 6 6 µV/°C

MAX

vs. Supply Voltage (PSR)
+PSR 74 80 74 80 dB
–PSR 64 66 64 66 dB

COMMON-MODE REJECTION R
+CMR Gain = 10, 100 f = 100 Hz, V
±CMR Gain = 10, 100 f = 10 kHz, V
–CMR Gain = 10, 100* f = 100 Hz, V

= 10 k⍀

L

= +24 V 66 90 80 90 dB

CM

= +6 V 55 64 55 64 dB

CM

= –2 V 60 85 73 85 dB

CM

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

– l) 6 (VS – l) V

S

OUTPUT
Output Voltage Swing R

= 10 k⍀

L

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

12 12 mA

SC

NOISE
Voltage Noise RTI
Gain = 10 f = 0.1 Hz–10 Hz 2 2 µV p-p
Gain = 100 f = 0.1 Hz–10 Hz 2 2 µV p-p
Gain = 10 f = 1 kHz 0.25 0.25 µV/
Gain = 100 f = 1 kHz 0.25 0.25 µV/

Hz
Hz

DYNAMIC RESPONSE
–3 dB Bandwidth V
Slew Rate, T

MIN

to T

Gain = 10 0.17 0.22 0.17 0.22 V/µs

MAX

= +1 V dc 100 100 kHz

OUT

Gain = 100 0.1 0.17 0.1 0.17 V/µs
Settling Time to 0.01%, 1 V Step 24 22 µs

POWER SUPPLY
Operating Range T

MIN

to T

A

2.4 5 12 2.4 5 10 V

MAX

= T
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 Number of Transistors 46 46

*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.
Specifi cations subject to change without notice.

–2–

REV. D

AD626

冑
冑

DUAL SUPPLY

(@+VS = ⴞ5 V and TA = 25ⴗC, un less oth er wise noted.)

Model AD626A AD626B
Parameter Condition Min Typ Max Min Typ Max Unit

GAIN
Gain Accuracy Total Error
Gain = 10 R

= 10 k⍀ 0.2 0.5 0.1 0.3 %

L

Gain = 100 0.25 1.0 0.15 0.6 %
Over Temperature, T

MIN

to T

A

G = 10 50 30 ppm/°C

MAX

= T
G = 100 100 80 ppm/°C
Gain Linearity
Gain = 10 0.045 0.055 0.045 0.055 %
Gain = 100 0.01 0.015 0.01 0.015 %

OFFSET VOLTAGE
Input Offset Voltage 50 500 50 250 µV
vs. Temperature T
vs. Temperature T

MIN

MIN

to T
to T

, G = 10 or 100 1.0 0.5 mV

MAX

, G = 10 or 100 1.0 0.5 µV/°C

MAX

vs. Supply Voltage (PSR)
+PSR 74 80 74 80 dB
–PSR 64 66 64 66 dB

COMMON-MODE REJECTION R
+CMR Gain = 10, 100 f = 100 Hz, V
±CMR Gain = 10, 100 f = 10 kHz, V

= 10 k⍀

L

= +24 V 66 90 80 90 dB

CM

= 6 V 55 60 55 60 dB

CM

COMMON-MODE VOLTAGE RANGE
+CMV Gain = 10 CMR > 85 dB 26.5 26.5 V
–CMV Gain = 10 CMR > 85 dB 32.5 32.5 V

INPUT
Input Resistance
Differential 200 200 k⍀
Common-Mode 110 110 k⍀
Input Voltage Range (Common-Mode) 6 (V

– l) 6 (VS – l) V

S

OUTPUT
Output Voltage Swing R

= 10 k⍀

L

Positive Gain = 10, 100 4.7 4.90 4.7 4.90 V
Negative Gain = 10 –1.65 –2.1 –1.65 –2.1 V
Gain = 100 –1.45 –1.8 –1.45 –1.8 V
Short Circuit Current
+I
–I

12 12 mA

SC

0.5 0.5 mA

SC

NOISE
Voltage Noise RTI
Gain = 10 f = 0.1 Hz–10 Hz 2 2 µV p-p
Gain = 100 f = 0.1 Hz–10 Hz 2 2 µV p-p
Gain = 10 f = 1 kHz 0.25 0.25 µV/
Gain = 100 f = 1 kHz 0.25 0.25 µV/

Hz
Hz

DYNAMIC RESPONSE
–3 dB Bandwidth V
Slew Rate, T

MIN

to T

Gain = 10 0.17 0.22 0.17 0.22 V/µs

MAX

= +1 V dc 100 100 kHz

OUT

Gain = 100 0.1 0.17 0.1 0.17 V/µs
Settling Time to 0.01%, 1 V Step 24 22 µs

POWER SUPPLY
Operating Range T

MIN

to T

A

⫾1.2 ⫾5 ⫾6 ⫾1.2 ⫾5 ⫾6 V

MAX

= T
Quiescent Current Gain = 10 1.5 2 1.5 2 mA
Gain = 100 1.5 2 1.5 2 mA

TRANSISTOR COUNT Number of Transistors 46 46

Specifi cations subject to change without notice.

REV. D

–3–

AD626

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V

Internal Power Dissipation

2

1

Peak Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +60 V

Maximum Reversed Supply Voltage Limit . . . . . . . . . . . . . –34 V

Output Short Circuit Duration . . . . . . . . . . . . . . . . . . Indefi nite

Storage Temperature Range (N, R) . . . . . . . . . –65°C to +125°C

Operating Temperature Range

AD626A/AD626B . . . . . . . . . . . . . . . . . . . . –40°C to +85°C

Lead Temperature Range (Soldering 60 sec) . . . . . . . . . +300°C

ORDERING GUIDE

Temperature Package Package
Model Range Description Option

AD626AN –40°C to +85°C Plastic DIP N-8
AD626AR –40°C to +85°C Small Outline IC R-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 Max i mum Ratings may cause per ma nent

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 specifi cation is not implied. Exposure to ab so lute maximum rating con di tions
for extended periods may affect device re li abil i ty.

2

8-Lead Plastic Package: ␪JA = 100°C/W; ␪JC = 50°C/W.

8-Lead SOIC Package: ␪JA = 155°C/W; ␪

= 40°C/W.

JC

METALLIZATION PHOTOGRAPH

Dimensions shown in inches and (mm).

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily ac cu mu late
on the human body and test equipment and can discharge without detection. Although the AD626 features
proprietary ESD pro tec tion circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD pre cau tions are rec om mend ed to avoid per for mance
deg ra da tion or loss of functionality.

–4–

REV. D