Datasheet-AD623 - DATASHEET PDF

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Single-Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier AD623 FEATURES

CONNECTION DIAGRAM

Easy to use Higher performance than discrete design Single-supply and dual-supply operation Rail-to-rail output swing Input voltage range extends 150 mV below ground (single supply) Low power, 550 µA maximum supply current Gain set with one external resistor Gain range: 1 (no resistor) to 1000 High accuracy dc performance 0.10% gain accuracy (G = 1)

AD623 1

8

+RG

–IN

2

7

+V S

+IN

3

6

OUTPUT

–VS

4

5

REF 0 0778-001

–RG

TOP VIEW (Not to Scale)

Figure 1. 8-Lead PDIP (N), SOIC (R), and MSOP (RM) Packages

120 110 100

×1000

90 ×100 CMR (dB)

80 70 ×10 60 50 ×1

40 30 1

10

100

1k

10k

FREQUENCY (Hz)

100k

00778-002

10 ppm maximum gain drift (G = 1) 200 µV maximum input offset voltage (AD623A) 2 µV/°C maximum input offset drift (AD623A) 100 µV maximum input offset voltage (AD623B) 1 µV/°C maximum input offset drift (AD623B) 25 nA maximum input bias current Noise: 35 nV/√Hz RTI noise @ 1 kHz (G = 1) Excellent ac specifications 90 dB minimum CMRR (G = 10); 70 dB minimum CMRR (G = 1) at 60 Hz, 1 kΩ source imbalance 800 kHz bandwidth (G = 1) 20 µs settling time to 0.01% (G = 10)

Figure 2. CMR vs. Frequency, 5 VS, 0 VS

APPLICATIONS Low power medical instrumentation Transducer interfaces Thermocouple amplifiers Industrial process controls Difference amplifiers Low power data acquisition

GENERAL DESCRIPTION The AD623 is an integrated single-supply instrumentation amplifier that delivers rail-to-rail output swing on a 3 V to 12 V supply. The AD623 offers superior user flexibility by allowing single gain set resistor programming and by conforming to the 8-lead industry standard pinout configuration. With no external resistor, the AD623 is configured for unity gain (G = 1), and with an external resistor, the AD623 can be programmed for gains up to 1000.

The AD623 holds errors to a minimum by providing superior ac CMRR that increases with increasing gain. Line noise, as well as line harmonics, are rejected because the CMRR remains constant up to 200 Hz. The AD623 has a wide input commonmode range and can amplify signals that have a common-mode voltage 150 mV below ground. Although the design of the AD623 was optimized to operate from a single supply, the AD623 still provides superior performance when operated from a dual voltage supply (±2.5 V to ±6.0 V). Low power consumption (1.5 mW at 3 V), wide supply voltage range, and rail-to-rail output swing make the AD623 ideal for battery-powered applications. The rail-to-rail output stage maximizes the dynamic range when operating from low supply voltages. The AD623 replaces discrete instrumentation amplifier designs and offers superior linearity, temperature stability, and reliability in a minimum of space.

Rev. D 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 that may result from its use. Specifications subject tochange without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks arethe property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. www.analog.com Tel: 781.329.4700 Fax: 781.461.3113 ©1997–2008 Analog Devices, Inc. All rights reserved.

AD623 TABLE OF CONTENTS Applications Information .............................................................. 16

Features .............................................................................................. 1 Applications ....................................................................................... 1

Basic Connection ....................................................................... 16

General Description ......................................................................... 1

Gain Selection ............................................................................. 16

Connection Diagram ....................................................................... 1

Reference Terminal .................................................................... 16

Revision History ............................................................................... 2

Input and Output Offset Voltage.............................................. 17

Specifications ..................................................................................... 3

Input Protection ......................................................................... 17

Single Supply ................................................................................. 3

RF Interference ........................................................................... 17

Dual Supplies ................................................................................ 4

Grounding ................................................................................... 18

Both Dual and Single Supplies.................................................... 6

Input Differential and Common-Mode Range vs. Supply and Gain .............................................................................................. 20

Absolute Maximum Ratings............................................................ 7

Outline Dimensions ....................................................................... 22

ESD Caution .................................................................................. 7 Typical Performance Characteristics ............................................. 8

Ordering Guide .......................................................................... 23

Theory of Operation ...................................................................... 15

REVISION HISTORY 7/08—Rev. C to Rev. D Updated Format ..................................................................Universal Changes to Features Section and General Description Section . 1 Changes to Table 3 ............................................................................ 6 Changes to Figure 40 ...................................................................... 14 Changes to Theory of Operation Section .................................... 15 Changes to Figure 42 and Figure 43............................................. 16 Changes to Table 7 .......................................................................... 19 Updated Outline Dimensions ....................................................... 22 Changes to Ordering Guide .......................................................... 23 9/99—Rev. B to Rev. C

Rev. D | Page 2 of 24

AD623 SPECIFICATIONS SINGLE SUPPLY Typical @ 25°C single supply, V S = 5 V, and RL = 10 kΩ, unless otherwise noted. Table 1. Parameter GAIN Gain Range Gain Error 1

G=1 G = 10 G = 100 G = 1000 Nonlinearity

G = 1 to 1000 Gain vs. Temperature G=1 G > 11 VOLTAGE OFFSET Input Offset, VOSI Over Temperature Average Tempco Output Offset, VOSO Over Temperature Average Tempco Offset Referred to the Input vs. Supply (PSR) G=1 G = 10 G = 100 G = 1000 INPUT CURRENT Input Bias Current Over Temperature Average Tempco Input Offset Current Over Temperature Average Tempco

Conditions G= 1 + (100 k/RG)

Min

AD623A Typ Max

1

1000

Min

AD623ARM Typ Max

1

1000

Min

AD623B Typ Max

1

Unit

1000

G1 VOUT = 0.05 V to 3.5 V G > 1 VOUT = 0.05 V to 4.5 V 0.03 0.10 0.10 0.10

0.10 0.35

0.03 0.10 0.10 0.10

0.35

0.10 0.35 0.35 0.35

0.03 0.10 0.10 0.10

0.05 0.35 0.35 0.35

% % % %

G1 VOUT = 0.05 V to 3.5 V G > 1 VOUT = 0.05 V to 4.5 V 50 5

50 10

5

50

50 10

50

ppm

5

10

25

100 160 1 500 1100 10

50

ppm/°C ppm/°C

Total RTI error = VOSI + VOSO/G 25 0.1 200 2.5

80 100 120 120

200 350 2 1000 1500 10

100 120 140 140 17 25 0.25

200 0.1 500 2.5

80 100 120 120 25 27.5 2 2.5

5

Rev. D | Page 3 of 24

500 650 2 2000 2600 10

100 120 140 140 17 25 0.25 5

0.1 200 2.5

80 100 120 120 25 27.5 2 2.5

100 120 140 140 17 25 0.25 5

µV µV µV/°C µV µV µV/°C

dB dB dB dB 25 27.5 2 2.5

nA nA pA/°C nA nA pA/°C

AD623 Parameter INPUT Input Impedance Differential Common-Mode Input Voltage Range 2 Common-Mode Rejection at 60 Hz with 1 kΩ Source Imbalance G=1 G = 10 G = 100 G = 1000 OUTPUT Output Swing

DYNAMIC RESPONSE Small Signal −3 dB Bandwidth G=1 G = 10 G = 100 G = 1000 Slew Rate Settling Time to 0.01% G=1 G = 10 1 2

Conditions

Min

AD623A Typ Max

Min

AD623ARM Typ Max

2||2 2||2 VS = 3 V to 12 V

(−VS) − 0.15

VCM = 0 V to 3 V VCM = 0 V to 3 V VCM = 0 V to 3 V VCM = 0 V to 3 V

70 90 105 105

RL = 10 kΩ

0.01

RL = 100 kΩ

0.01

VS = 5 V Step size: 3.5 V Step size: 4 V, VCM = 1.8 V

Min

2||2 2||2 (+VS) − 1.5

80 100 110 110

(−VS) − 0.15

70 90 105 105 (+VS) − 0.5 (+VS) − 0.15

2||2 2||2 (+VS) − 1.5

80 100 110 110

0.01

(−VS) − 0.15

77 94 105 105 (+VS) − 0.5 (+VS) − 0.15

0.01

AD623B Typ Max

(+VS) − 1.5

86 100 110 110

0.01

GΩ||pF GΩ||pF V

dB dB dB dB (+VS) − 0.5 (+VS) − 0.15

0.01

Unit

V V

800 100 10 2 0.3

800 100 10 2 0.3

800 100 10 2 0.3

kHz kHz kHz kHz V/µs

30 20

30 20

30 20

µs µs

Does not include effects of external resistor, RG. One input grounded. G = 1.

DUAL SUPPLIES Typical @ 25°C dual supply, V S = ±5 V, and RL = 10 kΩ, unless otherwise noted. Table 2. Parameter GAIN Gain Range Gain Error 1

G=1 G = 10 G = 100 G = 1000

Conditions G= 1 + (100 k/RG)

Min

AD623A Typ Max

1

1000

Min

AD623ARM Typ Max

1

1000

Min

AD623B Typ Max

1

Unit

1000

G1 VOUT = −4.8 V to +3.5 V G > 1 VOUT = 0.05 V to 4.5 V 0.03 0.10 0.10 0.10

0.10 0.35 0.35 0.35

Rev. D | Page 4 of 24

0.03 0.10 0.10 0.10

0.10 0.35 0.35 0.35

0.03 0.10 0.10 0.10

0.05 0.35 0.35 0.35

% % % %

AD623 Parameter Nonlinearity

Conditions G1 VOUT = −4.8 V to +3.5 V G > 1 VOUT = −4.8 V to +4.5 V

Min

G = 1 to 1000 Gain vs. Temperature G=1 G > 11 VOLTAGE OFFSET Input Offset, VOSI Over Temperature Average Tempco Output Offset, VOSO Over Temperature Average Tempco Offset Referred to the Input vs. Supply (PSR) G=1 G = 10 G = 100 G = 1000 INPUT CURRENT Input Bias Current Over Temperature Average Tempco Input Offset Current Over Temperature Average Tempco INPUT Input Impedance Differential Common-Mode Input Voltage Range 2 Common-Mode Rejection at 60 Hz with 1 kΩ Source Imbalance G=1 G = 10 G = 100 G = 1000 OUTPUT Output Swing

AD623A Typ Max

Min

AD623ARM Typ Max

50

Min

50

AD623B Typ Max

50

Unit

ppm

5 50

10

5 50

10

5 50

10

ppm/°C ppm/°C

25

200 350 2 1000 1500 10

200

500 650 2 2000 2600 10

25

100 160 1 500 1100 10

µV µV µV/°C µV µV µV/°C

Total RTI error = VOSI + VOSO/G

0.1 200 2.5

80 100 120 120

100 120 140 140 17 25 0.25

0.1 500 2.5

80 100 120 120 25 27.5

100 120 140 140 17 25 0.25

2 2.5

0.1 200 2.5

80 100 120 120 25 27.5

100 120 140 140 17 25 0.25

2 2.5

5

5

5

2||2 2||2

2||2 2||2

2||2 2||2

(+VS) – 1.5

70

80

70

80

77

86

dB

90

100

90

100

94

100

dB

105

110

105

110

105

110

dB

105

110

105

110

105

110

dB

RL = 10 kΩ, VS = ±5 V RL = 100 kΩ

(−VS) + 0.2 (−VS) + 0.05

Rev. D | Page 5 of 24

(−VS) + 0.2 (−VS) + 0.05

(+VS) – 1.5

GΩ||pF GΩ||pF V

VCM = +3.5 V to −5.15 V VCM = +3.5 V to −5.15 V VCM = +3.5 V to −5.15 V VCM = +3.5 V to −5.15 V

(+VS) − 0.5 (+VS) − 0.15

(−VS) – 0.15

2 2.5

nA nA pA/°C nA nA pA/°C

(−VS) – 0.15

(−VS) + 0.2 (−VS) + 0.05

(+VS) – 1.5

25 27.5

VS = +2.5 V to ±6 V

(+VS) − 0.5 (+VS) − 0.15

(−VS) – 0.15

dB dB dB dB

(+VS) − 0.5 (+VS) − 0.15

V V

AD623 Parameter DYNAMIC RESPONSE Small Signal −3 dB Bandwidth G=1 G = 10 G = 100 G = 1000 Slew Rate Settling Time to 0.01%

Conditions

Min

AD623A Typ Max

2

AD623ARM Typ Max

Min

AD623B Typ Max

Unit

800 100 10 2 0.3

800 100 10 2 0.3

800 100 10 2 0.3

kHz kHz kHz kHz V/µs

30 20

30 20

30 20

µs µs

VS = ±5 V, 5 V step

G=1 G = 10 1

Min

Does not include effects of external resistor, RG. One input grounded. G = 1.

BOTH DUAL AND SINGLE SUPPLIES Table 3. Parameter NOISE Voltage Noise, 1 kHz

Conditions

Min

AD623A Typ Max

Min

AD623ARM Typ Max

Min

AD623B Typ Max

Unit

Total RTI noise =

(eni )2 + (eno /G )2 Input, Voltage Noise, eni Output, Voltage Noise, eno RTI, 0.1 Hz to 10 Hz G=1 G = 1000 Current Noise 0.1 Hz to 10 Hz REFERENCE INPUT RIN IIN Voltage Range Gain to Output POWER SUPPLY Operating Range Quiescent Current Over Temperature TEMPERATURE RANGE For Specified Performance

f = 1 kHz

VIN+, VREF = 0 V

35 50

35 50

35 50

nV/√Hz nV/√Hz

3.0 1.5 100 1.5

3.0 1.5 100 1.5

3.0 1.5 100 1.5

µV p-p µV p-p fA/√Hz pA p-p

100 ± 20% 50

100 ± 20% 50

100 ± 20% 50

kΩ

−VS

60 +VS

−VS

1± 0.0002 Dual supply Single supply Dual supply Single supply

±2.5 2.7 375 305

−40

60 +VS

−VS

1± 0.0002 ±6 12 550 480 625

±2.5 2.7

+85

−40

Rev. D | Page 6 of 24

375 305

60 +VS

µA V V

±6 12 550 480 625

V V µA µA µA

+85

°C

1± 0.0002 ±6 12 550 480 625

±2.5 2.7

+85

−40

375 305

AD623 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Supply Voltage Internal Power Dissipation 1 Differential Input Voltage Output Short-Circuit Duration Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 10 sec) 1

Rating ±6 V 650 mW ±6 V Indefinite −65°C to +125°C −40°C to +85°C 300°C

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.

ESD CAUTION

Specification is for device in free air: 8-Lead PDIP Package: θJA = 95°C/W 8-Lead SOIC Package: θJA = 155°C/W 8-Lead MSOP Package: θJA = 200°C/W.

Rev. D | Page 7 of 24

AD623 TYPICAL PERFORMANCE CHARACTERISTICS At 25°C, VS = ±5 V, and RL = 10 kΩ, unless otherwise noted. 300

22

280 20

260

18

240 220

16

200

14 UNITS

UNITS

180 160 140 120

12 10 8

100 80

6

60

4

40

2

20 20

40

60

80

100 120 140

INPUT OFFSET VOLTAGE (µV)

–600 –500 –400 –300 –200 –100

0

00778-006

0 0

00778-003

0 –100 –80 –60 –40 –20

100 200 300 400 500

OUTPUT OFFSET VOLTAGE (µV)

Figure 6. Typical Distribution of Output Offset Voltage, VS = 5 V, Single Supply, VREF = −0.125 V; Package Option N-8, R-8

Figure 3. Typical Distribution of Input Offset Voltage; Package Option N-8, R-8

480

210

420

180

360

150

UNITS

UNITS

300 240

120 90

180 60

120

30

60

–600 –400 –200

0

200

400

600

800

OUTPUT OFFSET VOLTAGE (µV)

0 –0.245 –0.240 –0.235 –0.230 –0.225 –0.220 –0.215 –0.210 INPUT OFFSET CURRENT (nA)

Figure 4. Typical Distribution of Output Offset Voltage; Package Option N-8, R-8

Figure 7. Typical Distribution for Input Offset Current; Package Option N-8, R-8

22

20

20

18

18

16

16

14 UNITS

10

12 10 8

8

4

4

2

2

0 –80

–60

–40

–20

0

20

40

60

80

100

INPUT OFFSET VOLTAGE (µV)

0 –0.025 –0.020 –0.015 –0.010 –0.005

0

0.005

0.010

INPUT OFFSET CURRENT (nA)

Figure 5. Typical Distribution of Input Offset Voltag...