ANALOG DEVICES AD8554 Service Manual

Zero-Drift, Single-Supply, Rail-to-Rail

–

A

+

A

www.BDTIC.com/ADI

Input/Output Operational Amplifiers

FEATURES

Low offset voltage: 1 μV Input offset drift: 0.005 μV/°C Rail-to-rail input and output swing 5 V/2.7 V single-supply operation High gain, CMRR, PSRR: 130 dB Ultralow input bias current: 20 pA Low supply current: 700 μA/op amp Overload recovery time: 50 μs No external capacitors required

APPLICATIONS

Temperature sensors Pressure sensors Precision current sensing Strain gage amplifiers Medical instrumentation Thermocouple amplifiers

GENERAL DESCRIPTION

This family of amplifiers has ultralow offset, drift, and bias current. The AD8551, AD8552, and AD8554 are single, dual, and quad amplifiers featuring rail-to-rail input and output swings. All are guaranteed to operate from 2.7 V to 5 V with a single supply.

The AD855x family provides the benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Analog Devices, Inc. topology, these new zero-drift amplifiers combine low cost with high accuracy. No external capacitors are required.

AD8551/AD8552/AD8554

PIN CONFIGURATIONS

18

NC

IN

AD8551

IN

V–

45

NC = NO CONNECT

Figure 1. 8-Lead MSOP (RM Suffix)

1

NC

–IN A

2

AD8551

+IN

3

V–

4

NC = NO CONNECT

Figure 2. 8-Lead SOIC (R Suffix)

OUT A

–IN A +IN A

18

AD8552

V–

45

Figure 3. 8-Lead TSSOP (RU Suffix)

1

OUT A

–IN A

2

AD8552

+IN A

3

V–

4

Figure 4. 8-Lead SOIC (R Suffix)

OUT A

–IN A +IN A

+IN B –IN B

OUT B

114

V+

AD8554

78

Figure 5. 14-Lead TSSOP (RU Suffix)

8

7

6

5

8

7

6

5

NC V+

OUT A NC

NC

V+

OUT A

NC

V+ OUT B

–IN B +IN B

V+

OUT B

–IN B

+IN B

OUT D –IN D +IN D V– +IN C –IN C OUT C

1101-001

1101-002

01101-003

01101-004

1101-005

With an offset voltage of only 1 μV and drift of 0.005 μV/°C, the AD855x are perfectly suited for applications in which error sources cannot be tolerated. Temperature, position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature range. The rail-to-rail input and output swings provided by the AD855x family make both high-side and low-side sensing easy.

The AD855x family is specified for the extended industrial/auto

OUT A

–IN A

+IN A

V+

+IN B

–IN B

OUT B

Figure 6. 14-Lead SOIC (R Suffix)

motive temperature range (−40°C to +125°C). The AD8551 single amplifier is available in 8-lead MSOP and 8-lead narrow SOIC packages. The AD8552 dual amplifier is available in 8-lead narrow SOIC and 8-lead TSSOP surface-mount packages. The AD8554 quad is available in 14-lead narrow SOIC and 14-lead TSSOP packages.

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 to change without notice. 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 owners.

1

2

3

4

5

6

7

AD8554

14

13

12

11

10

9

8

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

01101-006

AD8551/AD8552/AD8554

www.BDTIC.com/ADI

REVISION HISTORY

9/08—Rev. C to Rev. D

Changes to Ordering Guide .......................................................... 23

3/07—Rev. B to Rev. C

Changes to Specifications Section .................................................. 3

2/07—Rev. A to Rev. B

Updated Format .................................................................. Universal

Changes to Figure 54 ...................................................................... 16

Deleted Spice Model Section ......................................................... 19

Deleted Figure 63, Renumbered Sequentially ............................ 19

Changes to Ordering Guide .......................................................... 24

11/02—Rev. 0 to Rev. A

Edits to Figure 60 ............................................................................ 16

Updated Outline Dimensions ....................................................... 20

Rev. D | Page 2 of 24

AD8551/AD8552/AD8554

www.BDTIC.com/ADI

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

VS = 5 V, VCM = 2.5 V, VO = 2.5 V, TA = 25°C, unless otherwise noted.

Table 1.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage VOS 1 5 μV

−40°C ≤ TA ≤ +125°C 10 μV Input Bias Current IB 10 50 pA

AD8551/AD8554 −40°C ≤ TA ≤ +125°C 1.0 1.5 nA AD8552 −40°C ≤ TA ≤ +85°C 160 300 pA AD8552 −40°C ≤ TA ≤ +125°C 2.5 4 nA

Input Offset Current IOS 20 70 pA

AD8551/AD8554 −40°C ≤ TA ≤ +125°C 150 200 pA AD8552 −40°C ≤ TA ≤ +85°C 30 150 pA

AD8552 −40°C ≤ TA ≤ +125°C 150 400 pA Input Voltage Range 0 5 V Common-Mode Rejection Ratio CMRR VCM = 0 V to +5 V 120 140 dB

−40°C ≤ TA ≤ +125°C 115 130 dB Large Signal Voltage Gain1 AVO RL = 10 kΩ, VO = 0.3 V to 4.7 V 125 145 dB

−40°C ≤ TA ≤ +125°C 120 135 dB Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.005 0.04 μV/°C

OUTPUT CHARACTERISTICS

Output Voltage High VOH RL = 100 kΩ to GND 4.99 4.998 V R R R Output Voltage Low V R R R Output Short-Circuit Limit Current ISC ±25 ±50 mA

−40°C to +125°C ±40 mA Output Current IO ±30 mA

−40°C to +125°C ±15 mA

POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 120 130 dB

−40°C ≤ TA ≤ +125°C 115 130 dB Supply Current/Amplifier ISY VO = 0 V 850 975 μA

−40°C ≤ TA ≤ +125°C 1000 1075 μA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 10 kΩ 0.4 V/μs Overload Recovery Time 0.05 0.3 ms Gain Bandwidth Product GBP 1.5 MHz

NOISE PERFORMANCE

Voltage Noise en p-p 0 Hz to 10 Hz 1.0 μV p-p e Voltage Noise Density en f = 1 kHz 42 nV/√Hz Current Noise Density in f = 10 Hz 2 fA/√Hz

1

Gain testing is dependent upon test bandwidth.

R

OL

p-p 0 Hz to 1 Hz 0.32 μV p-p

n

= 100 kΩ to GND @ −40°C to +125°C 4.99 4.997 V

L

= 10 kΩ to GND 4.95 4.98 V

L

= 10 kΩ to GND @ −40°C to +125°C 4.95 4.975 V

L

= 100 kΩ to V+ 1 10 mV

L

= 100 kΩ to V+ @ −40°C to +125°C 2 10 mV

L

= 10 kΩ to V+ 10 30 mV

L

= 10 kΩ to V+ @ −40°C to +125°C 15 30 mV

L

Rev. D | Page 3 of 24

AD8551/AD8552/AD8554

www.BDTIC.com/ADI

VS = 2.7 V, VCM = 1.35 V, VO = 1.35 V, TA = 25°C, unless otherwise noted.

Table 2.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage VOS 1 5 μV

−40°C ≤ TA ≤ +125°C 10 μV Input Bias Current IB 10 50 pA

AD8551/AD8554 −40°C ≤ TA ≤ +125°C 1.0 1.5 nA AD8552 −40°C ≤ TA ≤ +85°C 160 300 pA AD8552 −40°C ≤ TA ≤ +125°C 2.5 4 nA

Input Offset Current I

AD8551/AD8554 −40°C ≤ TA ≤ +125°C 150 200 pA AD8552 −40°C ≤ TA ≤ +85°C 30 150 pA

AD8552 −40°C ≤ TA ≤ +125°C 150 400 pA Input Voltage Range 0 2.7 V Common-Mode Rejection Ratio CMRR VCM = 0 V to 2.7 V 115 130 dB

−40°C ≤ TA ≤ +125°C 110 130 dB Large Signal Voltage Gain1 AVO RL = 10 kΩ, VO = 0.3 V to 2.4 V 110 140 dB

−40°C ≤ TA ≤ +125°C 105 130 dB Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.005 0.04 μV/°C

OUTPUT CHARACTERISTICS

Output Voltage High VOH RL = 100 kΩ to GND 2.685 2.697 V R R R Output Voltage Low VOL RL = 100 kΩ to V+ 1 10 mV R R R Short-Circuit Limit ISC ±10 ±15 mA

−40°C to +125°C ±10 mA Output Current IO ±10 mA

−40°C to +125°C ±5 mA

POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 120 130 dB

−40°C ≤ TA ≤ +125°C 115 130 dB Supply Current/Amplifier ISY VO = 0 V 750 900 μA

−40°C ≤ TA ≤ +125°C 950 1000 μA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 10 kΩ 0.5 V/μs Overload Recovery Time 0.05 ms Gain Bandwidth Product GBP 1 MHz

NOISE PERFORMANCE

Voltage Noise en p-p 0 Hz to 10 Hz 1.6 μV p-p Voltage Noise Density en f = 1 kHz 75 nV/√Hz Current Noise Density in f = 10 Hz 2 fA/√Hz

1

Gain testing is dependent upon test bandwidth.

10 50 pA

OS

= 100 kΩ to GND @ −40°C to +125°C 2.685 2.696 V

L

= 10 kΩ to GND 2.67 2.68 V

L

= 10 kΩ to GND @ −40°C to +125°C 2.67 2.675 V

L

= 100 kΩ to V+ @ −40°C to +125°C 2 10 mV

L

= 10 kΩ to V+ 10 20 mV

L

= 10 kΩ to V+ @ −40°C to +125°C 15 20 mV

L

Rev. D | Page 4 of 24

AD8551/AD8552/AD8554

www.BDTIC.com/ADI

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

Supply Voltage 6 V

Input Voltage GND to VS + 0.3 V

Differential Input Voltage1 ±5.0 V

ESD (Human Body Model) 2000 V

Output Short-Circuit Duration to GND Indefinite

Storage Temperature Range −65°C to +150°C

Operating Temperature Range −40°C to +125°C

Junction Temperature Range −65°C to +150°C

Lead Temperature Range (Soldering, 60 sec) 300°C

1

Differential input voltage is limited to ±5.0 V or the supply voltage,

whichever is less.

THERMAL CHARACTERISTICS

Table 4.

Package Type θJA θ

8-Lead MSOP (RM) 190 44 °C/W 8-Lead TSSOP (RU) 240 43 °C/W 8-Lead SOIC (R) 158 43 °C/W 14-Lead TSSOP (RU) 180 36 °C/W 14-Lead SOIC (R) 120 36 °C/W

Unit

JC

ESD CAUTION

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.

Rev. D | Page 5 of 24

AD8551/AD8552/AD8554

www.BDTIC.com/ADI

TYPICAL PERFORMANCE CHARACTERISTICS

180

160

140

120

100

80

60

NUMBER OF AMPL IFIERS

40

20

0 –2.5

–1.5 –0. 5

OFFSET VOLTAGE (µV)

0.5

Figure 7. Input Offset Voltage Distribution at 2.7 V

VSY = 2.7V V T

1.5

CM

= 25°C

A

= 1.35V

2.5

01101-007

180

VSY = 5V V

160

140

120

100

NUMBER OF AMPLIFIERS

= 2.5V

CM

T

= 25°C

A

80

60

40

20

0 –2.5 –1.5 –0.5 1.5

OFFSET VOLTAGE (µV)

0.5 2.5

Figure 10. Input Offset Voltage Distribution at 5 V

01101-010

50

VSY = 5V T

= –40°C, +25° C, +85°C

A

40

30

20

10

0

INPUT BIAS CURRENT (pA)

–10

–20

–30

012 34

INPUT COMMON-MODE VOLTAGE (V)

+85°C

+25°C

–40°C

Figure 8. Input Bias Current vs. Common-Mode Voltage

1500

V

= 5V

SY

T

= 125°C

A

1000

500

0

–500

–1000

INPUT BIAS CURRENT (pA)

–1500

12

10

8

6

4

NUMBER OF AMPLI FIERS

2

5

01101-008

0

0123456

INPUT OFFSET DRIFT (nV/°C)

VSY = 5V V

= 2.5V

CM

T

= –40°C TO +125°C

A

01101-011

Figure 11. Input Offset Voltage Drift Distribution at 5 V

10k

VSY = 5V T

= 25°C

A

1k

100

10

OUTPUT VOLTAGE (mV)

1

SOURCE

SINK

–2000

01234

INPUT COMMON-MODE VOLTAGE (V)

Figure 9. Input Bias Current vs. Common-Mode Voltage

5

01101-009

0.1

0.0001 0.001 0.01 0.1 1 10 100

LOAD CURRENT (mA)

Figure 12. Output Voltage to Supply Rail vs. Load Current at 5 V

Rev. D | Page 6 of 24

01101-012

AD8551/AD8552/AD8554

www.BDTIC.com/ADI

10k

1k

VSY = 2.7V T

= 25°C

A

800

700

600

TA = +25°C

100

10

OUTPUT VOLTAGE (mV)

1

0.1

0.0001 0.001 0.01 0.1 1 10 100

SOURCE

SINK

LOAD CURRENT (mA)

Figure 13. Output Voltage to Supply Rail vs. Load Current at 2.7 V

0

VCM = 2.5V V

= 5V

SY

–250

–500

–750

INPUT BIAS CURRENT (pA)

–1000

–75 –50 125–25 100

0255075

TEMPERATURE ( °C)

Figure 14. Input Bias Current vs. Temperature

150

500

400

300

200

100

SUPPLY CURRENT PER AMPLIFI ER (µA)

0

061

01101-013

2345

SUPPLY VOLTAGE (V)

1101-016

Figure 16. Supply Current per Amplifier vs. Supply Voltage

60

VSY = 2.7V

50

40

30

20

10

0

–10

OPEN-LOOP GAIN (dB)

–20

–30

–40

10k 100k 1M 10M 100M

01101-014

C

R

= 0pF

L

=

L

∞

FREQUENCY (Hz)

0

45

90

135

180

225

270

PHASE SHIFT (Degrees)

01101-017

Figure 17. Open-Loop Gain and Phase Shift vs. Frequency at 2.7 V

1.0

VCM = 2.5V V

= 5V

SY

0.8

0.6

0.4

SUPPLY CURRENT (mA)

0.2

0 –75 –50 125–25 100 150

0255075

TEMPERATURE ( °C)

5V

2.7V

Figure 15. Supply Current vs. Temperature

01101-015

Rev. D | Page 7 of 24

60

VSY = 5V

= 0pF

C

50

L

=

R

∞

L

40

30

20

10

0

–10

OPEN-LOOP GAIN (dB)

–20

–30

–40

10k 100k 1M 10M 100M

FREQUENCY (Hz)

Figure 18. Open-Loop Gain and Phase Shift vs. Frequency at 5 V

0

45

90

135

180

225

270

PHASE SHIFT (Degrees)

1101-018

AD8551/AD8552/AD8554

www.BDTIC.com/ADI

60

50

AV = –100

40

30

AV = –10

20

10

AV = +1

0

–10

CLOSED-LOOP GAIN (dB)

–20

–30

–40

1k

10k 100k 1M 10M100

FREQUENCY (Hz)

Figure 19. Closed-Loop Gain vs. Frequency at 2.7 V

VSY = 2.7V

= 0pF

C

L

= 2kΩ

R

L

01101-019

300

VSY = 5V

270

240

210

180

150

120

90

OUTPUT IMPEDANCE (Ω)

60

30

0

AV = 100

10k 100k 1M 10M100 1k

FREQUENCY (Hz)

Figure 22. Output Impedance vs. Frequency at 5 V

AV = 10

AV = 1

01101-022

60

50

AV = –100

40

30

AV = –10

20

10

AV = +1

0

–10

CLOSED-LOOP GAIN (dB)

–20

–30

–40

1k

10k 100k 1M 10M100

FREQUENCY (Hz)

Figure 20. Closed-Loop Gain vs. Frequency at 5 V

300

VSY = 2.7V

270

240

210

180

150

120

90

OUTPUT IMPEDANCE (Ω)

60

30

0

AV = 100

AV = 10

10k 100k 1M 10M100 1k

FREQUENCY (Hz)

Figure 21. Output Impedance vs. Frequency at 2.7 V

AV = 1

VSY = 5V

= 0pF

C

L

= 2kΩ

R

L

VSY = 2.7V

= 300pF

C

L

= 2kΩ

R

L

= 1

A

V

2µs

01101-020

500mV

01101-023

Figure 23. Large Signal Transient Response at 2.7 V

VSY = 5V

= 300pF

C

L

= 2kΩ

R

L

= 1

A

V

5µs

01101-021

1V

1101-024

Figure 24. Large Signal Transient Response at 5 V

Rev. D | Page 8 of 24

ANALOG DEVICES AD8554 Service Manual

FEATURES

APPLICATIONS

GENERAL DESCRIPTION

PIN CONFIGURATIONS

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS

THERMAL CHARACTERISTICS

ESD CAUTION

TYPICAL PERFORMANCE CHARACTERISTICS