Analog Devices AD627 Datasheet

Micropower, Single and Dual Supply

8

7

6

5

1

2

3

4

R

G

–IN
+IN

–V

S

R

G

+V

S

OUTPUT
REF

AD627

FREQUENCY – Hz

100

1

CMRR – dB

90
80

70

60

50

40

30

20
10

0

10 100 1k 10k

TRADITIONAL

LOW POWER

DISCRETE DESIGN

AD627

a

FEATURES
Micropower, 85 ␮A Max Supply Current
Wide Power Supply Range (+2.2 V to ⴞ18 V)
Easy to Use

Gain Set with One External Resistor

Gain Range 5 (No Resistor) to 1,000
Higher Performance than Discrete Designs
Rail-to-Rail Output Swing
High Accuracy DC Performance

0.10% Gain Accuracy (G = 5) (AD627A)

10 ppm Gain Drift (G = 5)

125 ␮V Max Input Offset Voltage (AD627B)

200 ␮V Max Input Offset Voltage (AD627A)

1 ␮V/ⴗC Max Input Offset Voltage Drift (AD627B)

3 ␮V/ⴗC Max Input Offset Voltage Drift (AD627A)

10 nA Max Input Bias Current

Noise: 38 nV/√Hz RTI Noise @ 1 kHz (G = 100)

Excellent AC Specifications

77 dB Min CMRR (G = 5) (AD627A)

83 dB Min CMRR (G = 5) (AD627B)

80 kHz Bandwidth (G = 5)

135 ␮s Settling Time to 0.01% (G = 5, 5 V Step)

APPLICATIONS
4 mA-to-20 mA Loop Powered Applications
Low Power Medical Instrumentation—ECG, EEG
Transducer Interfacing
Thermocouple Amplifiers
Industrial Process Controls
Low Power Data Acquisition
Portable Battery Powered Instruments

Rail-to-Rail Instrumentation Amplifier

AD627

FUNCTIONAL BLOCK DIAGRAM

8-Lead Plastic DIP (N) and SOIC (R)

Wide supply voltage range (+2.2 V to ±18 V), and micropower

current consumption make the AD627 a perfect fit for a wide
range of applications. Single supply operation, low power con­sumption and rail-to-rail output swing make the AD627 ideal
for battery powered applications. Its rail-to-rail output stage
maximizes dynamic range when operating from low supply

voltages. Dual supply operation (±15 V) and low power con-

sumption make the AD627 ideal for industrial applications,
including 4 mA-to-20 mA loop-powered systems.

The AD627 does not compromise performance, unlike other
micropower instrumentation amplifiers. Low voltage offset,
offset drift, gain error, and gain drift keep dc errors to a mini­mum in the users system. The AD627 also holds errors over
frequency to a minimum by providing excellent CMRR over
frequency. Line noise, as well as line harmonics, will be rejected,
since the CMRR remains high up to 200 Hz.

The AD627 provides superior performance, uses less circuit
board area and does it for a lower cost than micropower discrete
designs.

PRODUCT DESCRIPTION

The AD627 is an integrated, micropower, instrumentation
amplifier that delivers rail-to-rail output swing on single and

dual (+2.2 V to ±18 V) supplies. The AD627 provides the user

with excellent ac and dc specifications while operating at only

85 µA max.

The AD627 offers superior user flexibility by allowing the user
to set the gain of the device with a single external resistor, and
by conforming to the 8-lead industry standard pinout configura­tion. With no external resistor, the AD627 is configured for a
gain of 5. With an external resistor, it can be programmed for
gains of up to 1000.

REV. A

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.

Figure 1. CMRR vs. Frequency, ±5 VS, Gain = 5

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1999

AD627–SPECIFICATIONS

SINGLE SUPPLY

(typical @ +25ⴗC Single Supply, VS = +3 V and +5 V and RL = 20 k⍀, unless otherwise noted)

Model AD627A AD627B
Specification Conditions Min Typ Max Min Typ Max Units

GAIN G = 5 + (200 kΩ/R

Gain Range 5 1000 5 1000 V/V
Gain Error

1

V

= (–VS) + 0.1 to (+VS) – 0.15

OUT

)

G

G = 5 0.03 0.10 0.01 0.06 %
G = 10 0.15 0.35 0.10 0.25 %
G = 100 0.15 0.35 0.10 0.25 %
G = 1000 0.50 0.70 0.25 0.35 %

Nonlinearity

G = 5 10 100 10 100 ppm
G = 100 20 100 20 100 ppm

Gain vs. Temperature

1

G = 5 10 20 10 20 ppm/°C
G > 5 –75 –75 ppm/°C

VOLTAGE OFFSET

Input Offset, V

Over Temperature VCM = V

OSI

2

= +V

REF

/2 445 215 µV

S

50 250 25 150 µV

Average TC 0.1 3 0.1 1 µV/°C

Output Offset, V

OSO

1000 500 µV
Over Temperature 1650 1150 µV
Average TC 2.5 10 2.5 10 µV/°C

Offset Referred to the Input

vs. Supply (PSRR)

G = 5 86 100 86 100 dB
G = 10 100 120 100 120 dB
G = 100 110 125 110 125 dB
G = 1000 110 125 110 125 dB

INPUT CURRENT

Input Bias Current 3 10 3 10 nA

Over Temperature 15 15 nA

Average TC 20 20 pA/°C

Input Offset Current 0.3 1 0.3 1 nA

Over Temperature 22nA

Average TC 1 1 pA/°C

INPUT

Input Impedance

Differential 20储220储2GΩ储pF
Common-Mode 20储220储2GΩ储pF

Input Voltage Range

Common-Mode Rejection

Ratio DC to 60 Hz with V

3

VS = +2.2 V to +36 V (–VS) – 0.1 (+VS) – 1 (–VS) – 0.1 (+VS) – 1 V

3

= VS/2

REF

1 kΩ Source Imbalance

G = 5 VS = +3 V, VCM = 0 V to +1.9 V 77 90 83 96 dB
G = 5 VS = +5 V, VCM = 0 V to +3.7 V 77 90 83 96 dB

OUTPUT

Output Swing R

= 20 kΩ (–V

L

R

= 100 kΩ (–V

L

) + 25 (+VS) – 70 (–VS) + 25 (+VS) – 70 mV

S

) + 7 (+VS) – 25 (–VS) + 7 (+VS) – 25 mV

S

Short-Circuit Current Short-Circuit to Ground ±25 ±25 mA

DYNAMIC RESPONSE

Small Signal –3 dB Bandwidth
G = 5 80 80 kHz

G = 100 3 3 kHz

G = 1000 0.4 0.4 kHz

Slew Rate +0.05/–0.07 +0.05/–0.07 V/µs

Settling Time to 0.01% VS = +3 V, +1.5 V Output Step

G = 5 65 65 µs
G = 100 290 290 µs

Settling Time to 0.01% VS = +5 V, +2.5 V Output Step

G = 5 85 85 µs
G = 100 330 330 µs

Overload Recovery 50% Input Overload 3 3 µs

NOTES

1

Does not include effects of external resistor RG.

2

See Table III for total RTI errors.

3

See Applications section for input range, gain range and common-mode range.

Specifications subject to change without notice

.

–2– REV. A

AD627

DUAL SUPPLY

(typical @ +25ⴗC Dual Supply, VS = ⴞ5 V and ⴞ15 V and RL = 20 k⍀, unless otherwise noted)

Model AD627A AD627B
Specification Conditions Min Typ Max Min Typ Max Units

GAIN G = 5 + (200 kΩ/R

Gain Range 5 1000 5 1000 V/V
Gain Error

1

V

= (–VS) + 0.1 to (+VS) – 0.15

OUT

)

G

G = 5 0.03 0.10 0.01 0.06 %
G = 10 0.15 0.35 0.10 0.25 %
G = 100 0.15 0.35 0.10 0.25 %
G = 1000 0.50 0.70 0.25 0.35 %

Nonlinearity

G = 5 V
G = 100 V

Gain vs. Temperature

1

= ±5 V/±15 V 10/25 100 10/25 100 ppm

S

= ±5 V/±15 V 10/15 100 10/15 100 ppm

S

G = 5 10 20 10 20 ppm/°C
G > 5 –75 –75 ppm/°C

VOLTAGE OFFSET Total RTI Error = V

Input Offset, V

Over Temperature VCM = V

OSI

2

= 0 V 395 190 µV

REF

OSI

+ V

OSO/G

25 200 25 125 µV

Average TC 0.1 3 0.1 1 µV/°C

Output Offset, V

OSO

1000 500 µV
Over Temperature 1700 1100 µV
Average TC 2.5 10 2.5 10 µV/°C

Offset Referred to the Input

vs. Supply (PSRR)

G = 5 86 100 86 100 dB
G = 10 100 120 100 120 dB
G = 100 110 125 110 125 dB
G = 1000 110 125 110 125 dB

INPUT CURRENT

Input Bias Current 2 10 2 10 nA

Over Temperature 15 15 nA

Average TC 20 20 pA/°C

Input Offset Current 0.3 1 0.3 1 nA

Over Temperature 55nA

Average TC 5 5 pA/°C

INPUT

Input Impedance

Differential 20储220储2GΩ储pF
Common-Mode 20储220储2GΩ储pF

Input Voltage Range

Common-Mode Rejection

3

V

= ±1.1 V to ±18 V (–V

S

3

) – 0.1 (+VS) – 1 (–VS) – 0.1 (+VS) – 1 V

S

Ratio DC to 60 Hz with

1 kΩ Source Imbalance

G = 5–1000 V
G = 5–1000 V

= ±5 V, V

S

= ±15 V, V

S

= –4 V to +3.0 V 77 90 83 96 dB

CM

= –12 V to +10.9 V 77 90 83 96 dB

CM

OUTPUT

Output Swing R

= 20 kΩ (–V

L

R

= 100 kΩ (–V

L

) + 25 (+VS) – 70 (–VS) + 25 (+VS) – 70 mV

S

) + 7 (+VS) – 25 (–VS) + 7 (+VS) – 25 mV

S

Short-Circuit Current Short Circuit to Ground ±25 ±25 mA

DYNAMIC RESPONSE

Small Signal –3 dB Bandwidth
G = 5 80 80 kHz

G = 100 3 3 kHz

G = 1000 0.4 0.4 kHz

Slew Rate +0.05/–0.06 +0.05/–0.06 V/µs

Settling Time to 0.01% V

= ±5 V, +5 V Output Step

S

G = 5 135 135 µs
G = 100 350 350 µs

Settling Time to 0.01% V

= ±15 V, +15 V Output Step

S

G = 5 330 330 µs
G = 100 560 560 µs

Overload Recovery 50% Input Overload 3 3 µs

NOTES

1

Does not include effects of external resistor RG.

2

See Table III for total RTI errors.

3

See Applications section for input range, gain range and common-mode range.

Specifications subject to change without notice.

–3–REV. A

AD627–SPECIFICATIONS

BOTH DUAL AND SINGLE SUPPLIES

Model AD627A AD627B
Specification Conditions Min Typ Max Min Typ Max Units

NOISE

Voltage Noise, 1 kHz Total RTI Noise =

Input, Voltage Noise, eni 38 38 nV/√Hz
Output, Voltage Noise, eno 177 177 nV/√Hz

RTI, 0.1 Hz to 10 Hz

G = 5 1.2 1.2 µV p-p
G = 1000 0.56 0.56 µV p-p

Current Noise f = 1 kHz 50 50 fA/√Hz

0.1 Hz to 10 Hz 1.0 1.0 pA p-p

REFERENCE INPUT

R

IN

Gain to Output 1 1
Voltage Range

POWER SUPPLY

Operating Range Dual Supply ±1.1 ±18 ±1.1 ±18 V
Quiescent Current 60 85 60 85 µA

Over Temperature 200 200 nA/°C

TEMPERATURE RANGE

For Specified Performance –40 +85 –40 +85 °C

NOTES

1

See Applications section for input range, gain range and common-mode range.

Specifications subject to change without notice.

1

RG =

∞

Single Supply 2.2 36 2.2 36 V

22

(eni) (eno/ )

+

G

125 125 kΩ

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V

Internal Power Dissipation

2

Plastic Package (N) . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 W

Small Outline Package (R) . . . . . . . . . . . . . . . . . . . . . 0.8 W

–IN, +IN . . . . . . . . . . . . . . . . . . . . . –V

Common-Mode Input Voltage . . . . –V

Differential Input Voltage (+IN – (–IN)) . . . . . . . . +V

1

– 20 V to +VS + 20 V

S

– 20 V to +VS + 20 V

S

S –

(–VS)

NOTES

1

Stresses above those listed under Absolute Maximum Ratings may cause perma-

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 specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.

2

Specification is for device in free air:

8-Lead Plastic DIP Package: θJA = 90°C/W.
8-Lead SOIC Package: θJA = 155°C/W.

Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite

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

Operating Temperature Range . . . . . . . . . . . –40°C to +85°C

Lead Temperature Range (Soldering 10 sec) . . . . . . . .+300°C

ORDERING GUIDE

Model Temperature Range Package Descriptions Package Options

AD627AN –40°C to +85°C Plastic DIP N-8
AD627AR –40°C to +85°C Small Outline (SOIC) SO-8
AD627AR-REEL –40°C to +85°C 8-Lead SOIC 13" Reel SO-8
AD627AR-REEL7 –40°C to +85°C 8-Lead SOIC 7" Reel SO-8
AD627BN –40°C to +85°C Plastic DIP N-8
AD627BR –40°C to +85°C Small Outline (SOIC) SO-8
AD627BR-REEL –40°C to +85°C 8-Lead SOIC 13" Reel SO-8
AD627BR-REEL7 –40°C to +85°C 8-Lead SOIC 7" Reel SO-8

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD627 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. A

WARNING!

ESD SENSITIVE DEVICE

AD627

OUTPUT CURRENT – mA

V+

0

OUTPUT VOLTAGE SWING – Volts

(V+) –1

(V+) –2

(V+) –3

(V–) +2

(V–) +1

V–

510152025

VS = 61.5V

SOURCING

VS = 62.5V

VS = 65V

VS = 615V

SINKING

VS = 61.5V

VS = 62.5V

VS = 65V

VS = 615V

Typical Performance Characteristics

100

90

80

70

60
50

40

NOISE – nV/ Hz, RTI

30

20

10

0

1

10 100 1k 10k 100k

Figure 2. Voltage Noise Spectral Density vs. Frequency

100

90
80

70

60

50

40

30

CURRENT NOISE – fA/ Hz

20
10

0

1

10 100 1k 10k

Figure 3. Current Noise Spectral Density vs. Frequency

GAIN = 5

GAIN = 100

GAIN = 1000

FREQUENCY – Hz

FREQUENCY – Hz

(@ +25ⴗC VS = ⴞ5 V, RL = 20 k⍀ unless otherwise noted)

–5.5

–5.0

–4.5

–4.0

–3.5

–3.0

–2.5

INPUT BIAS CURRENT – nA

–2.0

–1.5

–60 140–40

Figure 5. Input Bias Current vs. Temperature

65.5

64.5

63.5

62.5

61.5

POWER SUPPLY CURRENT – mA

60.5

59.5
0

TOTAL POWER SUPPLY VOLTAGE – Volts

Figure 6. Supply Current vs. Supply Voltage

VS = +5V

VS = 65V

VS = 615V

0

–20

20 40 60 80 100 120

TEMPERATURE – 8C

10 15 20 25 30 35

405

–3.200

–3.000

–2.800

–2.600

–2.400

INPUT BIAS CURRENT – nA

–2.200

–2.000

–15 15–10

COMMON-MODE INPUT – Volts

Figure 4. I

–5

BIAS

0

510

vs. CMV, VS = ±15 V

Figure 7. Output Voltage Swing vs. Output Current

–5–REV. A