OP747ARU-REEL_技术文档

Precision Micropower

Single-Supply Operational Amplifiers

a

OP777/OP727/OP747

FEATURES

FUNCTIONAL BLOCK DIAGRAMS

Low Offset Voltage: 100 ꢀV Max

Low Input Bias Current: 10 nA Max

8-Lead MSOP

(RM-8)

14-Lead SOIC

(R-14)

3.0

1.5

Single-Supply Operation:

Dual-Supply Operation: ꢁ

V to 30 V

V to ꢁ15 V

1

8

NC

ꢂIN

ꢃIN

Vꢂ

NC

V+

OUT

NC

Low Supply Current: 300 ꢀA/Amp Max

Unity Gain Stable

No Phase Reversal

OUT A

–IN A

ꢃIN A

Vꢃ

1

2

3

4

5

6

7

14

13

12

11

10

9

OUT D

–IN D

ꢃIN D

V–

OP777

4

5

NC = NO CONNECT

OP747

TOP VIEW

(Not to Scale)

APPLICATIONS

Current Sensing (Shunt)

Line or Battery-Powered Instrumentation

Remote Sensors

ꢃIN B

–IN B

OUT B

ꢃIN C

–IN C

OUT C

8-Lead SOIC

(R-8)

8

Precision Filters

OP727 SOIC Pin-Compatible with LT1013

NC

1

2

3

4

8

7

6

5

OP777

14-Lead TSSOP

(RU-14)

ꢂIN

V+

GENERAL DESCRIPTION

+IN

OUT

NC

The OP777 , OP727 , and OP747 are precision single , dual,

and quad rail-to-rail output single- supply amplifiers featuring

micropoweroperationandrail-to-railoutputranges. These

amplifier sprovideimprovedperformanceovertheindustry -standard

OP07with 15 V supplies , andofferthefurtheradvantageoftrue

Vꢂ

OUT A

–IN A

ꢃIN A

Vꢃ

1

2

3

4

5

6

7

14

13

12

11

10

9

OUT D

–IN D

ꢃIN D

V–

NC = NO CONNECT

8-Lead TSSOP

(RU-8)

OP747

TOP VIEW

(Not to Scale)

single-supplyoperationdownto

V , andsmallerpackage

3.0

options than any other high-voltage precision bipolar amplifier.

Outputs are stable with capacitiveloadsofover 500pF. Supply

currentis lessthan300 μAperamplifierat5V. 500 Ω seriesresis-

tors protect the inputs, allowing input signal levels several volts above

the positive supply without phase reversal.

ꢃIN B

–IN B

OUT B

ꢃIN C

–IN C

OUT C

1

2

3

4

8

7

6

5

OUT A

–IN A

Vꢃ

8

OP727

TOP VIEW

OUT B

–IN B

ꢃIN B

ꢃIN A

(Not to Scale)

V–

Applicationsfortheseamplifiersincludebothline-poweredand

portable instrumentation, remote sensor signal conditioning, and

precision filters.

8-Lead SOIC

(R-8)

TheOP777,OP727,andOP747arespecifiedovertheextended

industrial (–40°C to +85°C) temperature range. The OP777,

single, isavailablein8-leadMSOPand8-leadSOICpackages.

The OP747, quad, is available in 14-lead TSSOP and narrow

14-leadSO packages.Surface-mountdevicesinTSSOPand MSOP

packagesareavailableintapeandreelonly.

ꢃIN A

V–

1

8

7

6

5

–IN A

2

3

4

OUT A

OP727

TOP VIEW

(Not to Scale)

ꢃIN B

–IN B

Vꢃ

OUT B

TheOP727,dual,isavailablein8-leadTSSOPand8-lead

SOICpackages.TheOP7278-leadSOICpinconfiguration

differsfromthestandard8-leadoperationalamplifierpinout.

NOTE: THIS PIN CONFIGURATION DIFFERS

FROM THE STANDARD 8-LEAD

OPERATIONAL AMPLIFIER PINOUT.

SIMILAR LOW POWER PRODUCTS

Supply Voltage/

Supply Current

1.8 V/1 μA

AD8500

AD8502

AD8504

1.8 V/20 μA

ADA4051-1

ADA4051-2

1.8 V/25 μA

AD8505

AD8506

1.8 V/50 μA

2.5 V/1 mA

3.0 V/200 μA

4 V/215 μA

Single

Dual

Quad

AD8603/AD8613

AD8607/AD8617

AD8609/AD8619

ADA4528-1

ADA4091-2

ADA4091-4

AD8622

AD8624

AD8508

D

REV.

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

www.analog.com

Fax:781/461-3113

OP777/OP727/OP747–SPECIFICATIONS

(@ V = 5.0 V, V_CM= 2.5 V, T_A= 25ꢄC unless otherwise noted.)

ELECTRICAL CHARACTERISTICS

S

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

INPUTCHARACTERISTICS

OffsetVoltageOP777

V_OS

+25ꢀC < T_A< +85 ꢀC

–40°C < T_A< +85 °C

+25ꢀC < T_A< +85 ꢀC

–40°C < T_A< +85 °C

20

50

30

60

5.5

0.1

100

200

160

300

11

2

4

μV

OffsetVoltageOP727/OP747

μV

InputBiasCurrent

Input Offset Current

InputVoltageRange

I_B

I_OS

nA

V

0

Common-ModeRejectionRatio

LargeSignalVoltageGain

Offset Voltage Drift OP777

OffsetVoltageDriftOP727/OP747

CMRR

A_VO

ΔV_OS/ΔT

V

_CM= 0 V to 4 V

104

300

110

500

0.3

0.4

dB

R_L= 10 k Ω, V_O= 0.5 V to 4.5 V

V/mV

μV/°C

–40°C < T_A< +85 °C

1.3

1.5

–40°C < T_A< +85 °C

OUTPUTCHARACTERISTICS

Output Voltage High

OutputVoltageLow

V_OH

V_OL

I_OUT

I_L= 1 mA, –40 °C to +85 °C

V_DROPOUT< 1 V

4.88

120

4.91

126

10

V

mV

mA

140

OutputCircuit

POWERSUPPLY

PowerSupplyRejectionRatio

SupplyCurrent/AmplifierOP777

PSRR

I_SY

V_S= 3 V to 30 V

V_O= 0 V

–40°C < T_A< +85 °C

V_O= 0 V

130

220

270

235

290

dB

μA

270

320

290

350

SupplyCurrent/AmplifierOP727/OP747

–40°C < T_A< +85 °C

DYNAMICPERFORMANCE

SlewRate

GainBandwidthProduct

SR

GBP

R_L= 2 kΩ

0.2

0.7

V/μs

MHz

NOISEPERFORMANCE

VoltageNoise

VoltageNoiseDensity

e_np-p

e_n

i_n

0.1Hzto10Hz

f = 1 kHz

0.4

15

0.13

μV p-p

nV/√Hz

pA/√Hz

CurrentNoiseDensity

NOTES

Typical specifications: >50% of units perform equal to or better than the “typical” value.

Specifications subject to change without notice.

D

–2–

REV.

OP777/OP727/OP747

(@ ꢁ15 V, V_CM= 0 V, T_A= 25ꢄC unless otherwise noted.)

ELECTRICAL CHARACTERISTICS

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

INPUTCHARACTERISTICS

OffsetVoltageOP777

V_OS

+25°C < T_A< +85 °C

–40°C < T_A< +85 °C

+25°C < T_A< +85 °C

–40°C < T_A< +85 °C

30

50

30

50

5

100

200

160

300

10

μV

OffsetVoltageOP727/OP747

μV

InputBiasCurrent

Input Offset Current

InputVoltageRange

I_B

I_OS

nA

0.1

2

+14

nA

V

–15

Common-ModeRejectionRatio

LargeSignalVoltageGain

Offset Voltage Drift OP777

OffsetVoltageDriftOP727/OP747

CMRR

A_VO

V

_CM= –15 V to +14 V

110

1,000

120

2,500

0.3

dB

R_L= 10 k Ω, V_O= –14.5 V to +14.5 V

V/mV

μV/°C

ΔV_OS/ΔT –40°C < T_A< +85 °C

1.3

1.5

0.4

OUTPUTCHARACTERISTICS

Output Voltage High

OutputVoltageLow

V_OH

V_OL

I_OUT

I_L= 1 mA, –40 °C to +85 °C

+14.9

120

+14.94

–14.94 –14.9

30

V

mA

OutputCircuit

POWERSUPPLY

PowerSupplyRejectionRatio

SupplyCurrent/AmplifierOP777

PSRR

I_SY

V_S= 1.5 V to 15 V

V_O= 0 V

–40°C < T_A< +85 °C

V_O= 0 V

130

dB

μA

300

350

320

375

350

400

375

450

SupplyCurrent/AmplifierOP727/747

–40°C < T_A< +85 °C

DYNAMICPERFORMANCE

SlewRate

GainBandwidthProduct

SR

GBP

R_L= 2 kΩ

0.2

0.7

V/μs

MHz

NOISEPERFORMANCE

VoltageNoise

VoltageNoiseDensity

CurrentNoiseDensity

e_np-p

e_n

i_n

0.1Hzto10Hz

f = 1 kHz

0.4

15

0.13

μV p-p

nV/√Hz

pA/√Hz

Specifications subject to change without notice.

D

–3–

REV.

OP777/OP727/OP747

ABSOLUTE MAXIMUM RATINGS^{1, 2}

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

Input Voltage . . . . . . . . . . . . . . . . . . . . –V_S– 5 V to +V_S+ 5 V

Differential Input Voltage . . . . . . . . . . . . . .

Output Short-Circuit Duration to GND . . . . . . . . . Indefinite

Storage Temperature Range

RM, R, RU Packages . . . . . . . . . . . . . . . . –65°C to +150°C

Operating Temperature Range

OP777/OP727/OP747 . . . . . . . . . . . . . . . –40°C to +85°C

Junction Temperature Range

RM, R, RU Packages . . . . . . . . . . . . . . . . –65°C to +150°C

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

Electrostatic Discharge (Human Body Model) . . . . 2000 V max

3

Package Type

ꢅ_JA

ꢅ_JC

Unit

8-LeadMSOP(RM)

8-LeadSOIC(R)

8-LeadTSSOP(RU)

14-LeadSOIC(R)

14-LeadTSSOP(RU)

190

158

240

120

180

44

43

36

35

°C/W

Supply Voltage

NOTES

¹Absolute maximum ratings apply at 25°C, unless otherwise noted.

²Stresses 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 listed in the operational

sections of this specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

³θ_JAis specified for worst-case conditions, i.e., θ_JAis specified for device soldered in

circuit board for surface-mount packages.

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 OP777/OP727/OP747 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.

WARNING!

ESD SENSITIVE DEVICE

D

–4–

REV.

Typical Performance Characteristics

–

OP777/OP727/OP747

30

220

V

T

= 5V

= 2.5V

= 25ꢄC

V

T

= ꢁ15V

= 0V

= 25ꢄC

SY

V

T

= ꢁ15V

= 0V

= ꢂ40ꢄC TO +85ꢄC

SY

200

180

160

200

180

160

CM

25

20

15

10

5

A

140

120

100

80

140

120

100

80

60

40

20

0

20

0

ꢂ100

0

20 40 60 80 100

ꢂ100

0

20 40 60 80 100

ꢂ80ꢂ60 ꢂ40ꢂ20

0

0.2

0.4

0.6

0.8

1.0

1.2

OFFSET VOLTAGE – ꢀV

INPUT OFFSET DRIFT – ꢀV/ꢄC

TPC 1. OP777 Input Offset Voltage

Distribution

TPC 2. OP777 Input Offset Voltage

Distribution

TPC 3. OP777 Input Offset Voltage

Drift Distribution

200

600

V

T

= ꢁ15V

= 0V

= 25ꢄC

V

T

= ꢁ15V

= 0V

= –40ꢄC TO +85ꢄC

SY

V

T

= 5V

= 2.5V

= 25ꢄC

SY

180

160

140

120

100

80

CM

500

400

300

200

100

0

500

400

300

200

100

0

A

60

40

20

0

–120 –80

–40

0

40

80

120

–120 –80

–40

0

40

80

120

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2

TCV – ꢀV/ꢄC

ꢀV

OFFSET VOLTAGE – ꢀV

OS

TPC 4. OP727/OP747 Input Offset

Voltage Drift (TCV_OSDistribution)

TPC 5. OP747 Input Offset Voltage

Distribution

TPC 6. OP747 Input Offset Voltage

Distribution

30

600

V

T

= ꢁ15V

= 0V

= 25ꢄC

V

T

= 5V

= 2.5V

= 25ꢄC

SY

V

T

= ꢁ15V

= 0V

= 25ꢄC

SY

CM

500

400

300

200

100

500

400

300

200

100

25

20

15

10

5

A

0

40

ꢂ140

80

120

ꢂ120

ꢂ80 ꢂ40

ꢂ140ꢂ120

0

40

ꢂ80 ꢂ40

3

5

7

80

120

4

6

8

INPUT BIAS CURRENT – nA

OFFSET VOLTAGE – ꢀV

TPC 7. OP727 Input Offset Voltage

Distribution

TPC 9. Input Bias Current

Distribution

TPC 8. OP727 Input Offset Voltage

Distribution

D

–5–

REV.

OP777/OP727/OP747

10k

6

5

4

3

2

10k

1k

V

T

= ꢁ15V

= 25ꢄC

V

T

= 5V

= 25ꢄC

S

V

= ꢁ15V

SY

A

1k

SINK

100

10

100

10

SOURCE

SINK

1.0

SOURCE

1

0.1

0

0.1

0

0.001

0.01

0.1

1

10

100

0.001

0.01

0.1

1

10

100

ꢂ60 ꢂ40ꢂ20

0

20 40 60 80 100 120 140

LOAD CURRENT – mA

TEMPERATURE – ꢄC

TPC 10. Output Voltage to Supply

Rail vs. Load Current

TPC 11. Output Voltage to Supply

Rail vs. Load Current

TPC 12. Input Bias Current vs.

Temperature

500

400

350

140

120

100

80

V

C

R

= ꢁ15V

T

= 25ꢄC

SY

A

= 0

=

LOAD

300

250

200

150

100

50

I

(V = ꢁ15V)

300

SY+ SY

200

100

0

I

(V = 5V)

SY+ SY

60

45

0

40

90

ꢂ100

ꢂ200

ꢂ300

ꢂ400

ꢂ500

20

135

180

225

270

I

(V = 5V)

SYꢂ SY

0

–20

–40

–60

I

(V = ꢁ15V)

SYꢂ SY

0

5

10

15

20

25

30

35

ꢂ60 ꢂ40 ꢂ20

0

20 40 60 80 100 120 140

TEMPERATURE – ꢄC

10

100 1k

10k 100k 1M 10M 100M

SUPPLY VOLTAGE – V

FREQUENCY – Hz

TPC 13. Supply Current vs.

Temperature

TPC 14. Supply Current vs. Supply

Voltage

TPC 15. Open Loop Gain and

Phase Shift vs. Frequency

140

120

100

60

V

C

R

= ꢁ15V

V

C

R

= 5V

SY

V

C

R

= 5V

SY

50

40

= 0

50

40

LOAD

= 0

= 2kꢇ

LOAD

= 2kꢇ

=

LOAD

A

= ꢂ100

V

A

= ꢂ100

V

80

60

40

20

0

30

0

30

20

45

20

A

= ꢂ10

V

A

= ꢂ10

V

10

90

10

0

135

180

225

270

0

A

= +1

V

A

= +1

V

ꢂ10

ꢂ20

ꢂ30

ꢂ40

ꢂ10

ꢂ20

ꢂ30

ꢂ40

–20

–40

–60

1k

10k

100k

1M

10M

100M

100

1k

10k 100k

1M

10M 100M

1k

10k

100k

1M

10M

100M

FREQUENCY – Hz

TPC 16. Open Loop Gain and

Phase Shift vs. Frequency

TPC 17. Closed Loop Gain vs.

Frequency

TPC 18. Closed Loop Gain vs.

Frequency

D

–6–

REV.

OP777/OP727/OP747

300

270

240

210

180

150

120

90

300

270

240

210

180

150

120

90

V

R

C

= ꢁ2.5V

= 2kꢇ

= 300pF

V

= 5V

V

= ꢁ15V

SY

A

= 1

L

V

A = 1

V

A

= 1

V

0V

A

= 100

100k

V

60

A

= 10

60

A

= 10

V

A

= 100

1k

V

30

0

100

1k

10k

1M

10M 100M

100

10k

100k

FREQUENCY – Hz

1M

10M 100M

TIME – 100ꢀs/DIV

FREQUENCY – Hz

TPC 19. Output Impedance vs.

Frequency

TPC 20. Output Impedance vs.

Frequency

TPC 21. Large Signal Transient

Response

V

R

C

= ꢁ15V

= 2kꢇ

= 300pF

V

C

R

= ꢁ2.5V

= 300pF

= 2kꢇ

V

C

R

= ꢁ15V

= 300pF

= 2kꢇ

SY

L

V

= 100mV

V

= 100mV

IN

A

= 1

V

A

= 1

A

= 1

V

0V

TIME – 100ꢀs/DIV

TIME – 10ꢀs/DIV

TPC 22. Large Signal Transient

Response

TPC 23. Small Signal Transient

Response

TPC 24. Small Signal Transient

Response

40

35

V

R

= ꢁ2.5V

= 2kꢇ

= 100mV

V

R

= ꢁ15V

= 2kꢇ

= 100mV

SY

INPUT

35

30

25

20

15

10

5

+200mV

L

30

25

20

15

10

V

IN

0V

ꢃOS

V

R

A

= ꢁ15V

= 10kꢇ

= ꢂ100

SY

+OS

L

V

ꢂOS

V

= 200mV

IN

ꢂOS

0V

ꢂ10V

5

0

OUTPUT

0

1

10

100

1k

1

10

100

1k

10k

TIME – 40ꢀs/DIV

CAPACITANCE – pF

TPC 25. Small Signal Overshoot

vs. Load Capacitance

TPC 26. Small Signal Overshoot

vs. Load Capacitance

TPC 27. Negative Overvoltage

Recovery

D

–7–

REV.

OP777/OP727/OP747

200mV

0V

INPUT

0V

INPUT

0V

V

R

A

= ꢁ15V

= 10kꢇ

= ꢂ100

SY

V

R

A

= ꢁ2.5V

= 10kꢇ

= ꢂ100

V

R

A

= ꢁ2.5V

= 10kꢇ

= ꢂ100

SY

ꢂ200mV

L

V

= ꢂ200mV

IN

V

= 200mV

V

= ꢂ200mV

IN

10V

0V

2V

0V

OUTPUT

ꢂ2V

OUTPUT

TIME – 40ꢀs/DIV

TPC 28. Positive Overvoltage

Recovery

TPC 29. Negative Overvoltage

Recovery

TPC 30. Positive Overvoltage

Recovery

140

V

A

= ꢁ15V

= 1

S

V

= ꢁ2.5V

V

= ꢁ15V

INPUT

SY

V

120

100

80

60

40

20

0

120

100

80

60

40

20

0

OUTPUT

10

100

1k

10k 100k

1M

10M

10

100

1k

10k 100k

1M

10M

TIME – 400ꢀs/DIV

FREQUENCY – Hz

TPC 31. No Phase Reversal

TPC 32. CMRR vs. Frequency

TPC 33. CMRR vs. Frequency

140

V = 5V

SY

GAIN = 10M

V

= ꢁ2.5V

V

= ꢁ15V

SY

120

100

80

60

40

20

0

120

100

80

60

40

20

0

+PSRR

ꢂPSRR

+PSRR

ꢂPSRR

10

100

1k

10k 100k

1M

10M

10

100

1k

10k 100k

1M

10M

TIME – 1s/DIV

FREQUENCY – Hz

TPC 34. PSRR vs. Frequency

TPC 35. PSRR vs. Frequency

TPC 36. 0.1 Hz to 10 Hz Input

Voltage Noise

D

–8–

REV.

OP777/OP727/OP747

90

80

70

90

V

= ꢁ15V

V

= ꢁ15V

V

= ꢁ2.5V

SY

GAIN = 10M

SY

80

70

60

50

40

30

20

10

60

50

40

30

20

10

0

100

200

300

400

500

100

200

300

400

500

TIME – 1s/DIV

FREQUENCY – Hz

TPC 37. 0.1 Hz to 10 Hz Input

Voltage Noise

TPC 38. Voltage Noise Density

TPC 39. Voltage Noise Density

50

40

V = 5V

SY

V

= ꢁ2.5V

V

= ꢁ15V

SY

40

35

30

35

30

20

I

SCꢂ

25

20

15

10

5

25

20

15

10

5

10

0

ꢂ10

ꢂ20

ꢂ30

I

SC+

ꢂ40

ꢂ50

0

ꢂ60ꢂ40 ꢂ20

0

500

1k

1.5k

2.0k

2.5k

20 40 60 80 100 120 140

0

500

1k

1.5k

2.0k

2.5k

FREQUENCY – Hz

TEMPERATURE – ꢄC

FREQUENCY – Hz

TPC 40. Voltage Noise Density

TPC 41. Voltage Noise Density

TPC 42. Short Circuit Current vs.

Temperature

160

50

4.95

V

I

= 5V

V

= ꢁ15V

V

I

= 5V

= 1mA

SY

= 1mA

SY

40

150

140

130

120

110

100

L

4.94

4.93

4.92

4.91

4.90

4.89

30

20

I

SCꢂ

10

0

ꢂ10

ꢂ20

ꢂ30

90

80

70

I

SC+

ꢂ40

ꢂ50

ꢂ40 ꢂ20

ꢂ60

0

20 40 60 80 100 120 140

ꢂ40 ꢂ20

0

ꢂ60ꢂ40 ꢂ20

0

20 40 60 80 100 120 140

TEMPERATURE – ꢄC

ꢂ60

20 40 60 80 100 120 140

TEMPERATURE – ꢄC

TPC 43. Short Circuit Current vs.

Temperature

TPC 44. Output Voltage High vs.

Temperature

TPC 45. Output Voltage Low vs.

Temperature

D

–9–

REV.

OP777/OP727/OP747

1.5

1.0

14.964

ꢂ14.930

ꢂ14.935

ꢂ14.940

ꢂ14.945

V

I

= ꢁ15V

= 1mA

V

= ꢁ15V

= 1mA

SY

V

= ꢁ15V

= 0V

= 25ꢄC

SY

14.962

I

L

CM

14.960

T

A

14.958

14.956

14.954

0.5

0

14.952

14.950

14.948

ꢂ0.5

ꢂ1.0

ꢂ1.5

ꢂ14.950

ꢂ14.955

ꢂ14.960

14.946

14.944

ꢂ40 ꢂ20

0

ꢂ60

20 40 60 80 100 120 140

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

TIME – Minutes

ꢂ60

20 40 60 80 100 120 140

TEMPERATURE – ꢄC

TPC 46. Output Voltage High vs.

Temperature

TPC 48. Warm-Up Drift

TPC 47. Output Voltage Low vs.

Temperature

BASIC OPERATION

The OP777/OP727/OP747 amplifier uses a precision Bipolar

PNP input stage coupled with a high-voltage CMOS output

stage. This enables this amplifier to feature an input voltage

range which includes the negative supply voltage (often ground-

in single-supply applications) and also swing to within 1 mV of the

output rails. Additionally, the input voltage range extends to within

1 V of the positive supply rail. The epitaxial PNP input structure

provides high breakdown voltage, high gain, and an input bias cur-

rent figure comparable to that obtained with a “Darlington” input

stage amplifier but without the drawbacks (i.e., severe penalties for

input voltage range, offset, drift and noise). The PNP input structure

also greatly lowers the noise and reduces the dc input error terms.

V

OUT

0V

V

IN

TIME – 0.2ms/DIV

Supply Voltage

Figure 1. Input and Output Signals with V_CM< 0 V

The amplifiers are fully specified with a single 5 V supply and, due

to design and process innovations, can also operate with a supply

voltage from3.0 V up to 30 V. This allows operation from most

split supplies used in current industry practice, with the advantage

of substantially increased input and output voltage ranges over

conventional split-supply amplifiers. The OP777/OP727/OP747

series is specified with (V_SY= 5 V, V– = 0 V and V_CM= 2.5 V

which is most suitable for single-supply application. With PSRR of

130 dB (0.3 μV/V) and CMRR of 110 dB (3 μV/V) offset is mini-

mally affected by power supply or common-mode voltages. Dual

supply, 15 V operation is also fully specified.

100kꢇ

+3V

ꢂ0.27V

100kꢇ

OP777/

OP727/

OP747

100kꢇ

ꢂ0.1V

V

= 1kHz at 400mV p-p

IN

Input Common-Mode Voltage Range

Figure 2. OP777/OP727/OP747 Configured as a Differ-

ence Amplifier Operating at V_CM< 0 V

The OP777/OP727/OP747 is rated with an input common-mode

voltage which extends from the minus supply to within 1 V of the

positive supply. However, the amplifier can still operate with input

voltages slightly below V_EE. In Figure 2, OP777/OP727/OP747 is

configured as a difference amplifier with a single supply of3.0

V

and negative dc common-mode voltages applied at the inputs

terminals. A 400 mV p-p input is then applied to the noninverting

input. It can be seen from the graph below that the output does not

show any distortion. Micropower operation is maintained by using

large input and feedback resistors.

D

–10–

REV.

OP777/OP727/OP747

Input Over Voltage Protection

Whentheinputofanamplifierismorethanadiodedropbelow

V

= ꢁ15V

SY

V

IN

V

_EE, or above V _CC, large currents will flow from the substrate

(V–) or the positive supply (V+), respectively, to the input pins

whichcandestroythedevice.InthecaseofOP777/OP727/

OP747,differentialvoltagesequaltothesupplyvoltagewillnot

causeanyproblem(seeFigure3).OP777/OP727/OP747has

built-in 500 Ω internal current limiting resistors, in series with the

inputs, to minimize the chances of damage. It is a good practice to

keep the current flowing into the inputs below 5 mA. In this con-

text it should also be noted that the high breakdown of the input

transistors removes the necessity for clamp diodes between the

inputs of the amplifier, a feature that is mandatory on many preci-

sion op amps. Unfortunately, such clamp diodes greatly interfere

with many application circuits such as precision rectifiers and

comparators. The OP777/OP727/OP747 series is free from such

limitations.

V

OUT

TIME – 400ꢀs/DIV

Figure 4. No Phase Reversal

Output Stage

The CMOS output stage has excellent (and fairly symmetric) output

drive and with light loads can actually swing to within 1 mV of both

supplyrails.Thisisconsiderablybetterthansimilaramplifiers

featuring(so-called)rail-to-railbipolaroutputstages.OP777/

OP727/OP747 is stable in the voltage follower configuration and

responds to signals as low as 1 mV above ground in single supply

operation.

30V

OP777/

V p-p = 32V

OP727/

OP747

3.0V TO 30V

Figure 3a. Unity Gain Follower

V

= 1mV

OUT

V

= ꢁ15V

V

= 1mV

SY

IN

OP777/

OP727/

OP747

V

IN

V

OUT

Figure 5. Follower Circuit

TIME – 400ꢀs/DIV

1.0mV

Figure 3b. Input Voltage Can Exceed the Supply Voltage

Without Damage

Phase Reversal

Manyamplifiersmisbehavewhenoneorbothoftheinputsare

forced beyond the input common-mode voltage range. Phase

reversal is typified by the transfer function of the amplifier effectively

reversing its transfer polarity. In some cases this can cause lockup in

servo systems and may cause permanent damage or nonrecoverable

parameter shifts to the amplifier. Many amplifiers feature compensa-

tion circuitry to combat these effects, but some are only effective for

the inverting input. Additionally, many of these schemes only work

for a few hundred millivolts or so beyond the supply rails. OP777/

OP727/OP747hasaprotectioncircuitagainstphasereversal

when one or both inputs are forced beyond their input common-

mode voltage range. It is not recommended that the parts be

continuouslydrivenmorethan3Vbeyondtherails.

TIME – 10ꢀs/DIV

Figure 6. Rail-to-Rail Operation

Output Short Circuit

The output of the OP777/OP727/OP747 series amplifier is protected

from damage against accidental shorts to either supply voltage,

provided that the maximum die temperature is not exceeded on a

long-term basis (see Absolute Maximum Rating section). Current of

up to 30 mA does not cause any damage.

A Low-Side Current Monitor

In the design of power supply control circuits, a great deal of design

effort is focused on ensuring a pass transistor’s long-term reliability

over a wide range of load current conditions. As a result, monitoring

D

REV.

–11–

OP777/OP727/OP747

15V

andlimitingdevicepowerdissipationisofprimeimportancein

thesedesigns. Figure7showsanexampleof5V, single-supply

current monitor that can be incorporated into the design of a voltage

regulatorwithfoldbackcurrentlimitingorahighcurrentpower

supplywithcrowbarprotection.Thedesigncapitalizesonthe

OP777’scommon-moderangethatextendstoground.Current

1kꢇ

REF

192

2N2222

1/4 OP747

R2

12kꢇ

3

4

ismonitoredinthepowersupplyreturnwherea0.1

Ω shunt

20kꢇ

+15V

R1

R

resistor, R_SENSE, creates a very small voltage drop. The voltage at the

inverting terminal becomes equal to the voltage at the noninverting

terminal through the feedback of Q1, which is a 2N2222 or equiva-

lent NPN transistor. This makes the voltage drop across R1 equal to

the voltage drop across R_SENSE. Therefore, the current through Q1

becomes directly proportional to the current through R_SENSE, and

the output voltage is given by:

V

O

R(1+ꢈ)

+15V

1/4 OP747

ꢂ15V

R2

R1

ꢆR

R

V

=

V

ꢈ

O

REF

1/4 OP747

ꢈ =

ꢂ15V

Figure 9. Linear Response Bridge

⎛ R2

⎝ R1

⎞

A single-supply current source is shown in Figure 10. Large resistors

are used to maintain micropower operation. Output current can be

adjustedbychangingtheR2Bresistor.Compliancevoltageis:

V_OUT= 5V −

× R_SENSE× I_L

⎜

⎟

⎠

The voltage drop across R2 increases with I_Lincreasing, so V_OUT

decreases with higher supply current being sensed. For the element

values shown, the V_OUTis 2.5 V for return current of 1 A.

V_L≤ V_SAT− V_S

10pF

3.0V TO 30V

5V

100kꢇ

R2 = 2.49kꢇ

100kꢇ

V

OP777

OUT

R1 = 100kꢇ

Q1

R2B

5V

2.7kꢇ

10pF

I

O

R2 = R2A + R2B

R2

R1 ꢉ R2B

= 1mA ꢂ 11mA

+

R2A

97.3kꢇ

OP777

R1 = 100ꢇ

V

R

LOAD

L

I

=

V

S

O

0.1ꢇ

RETURN TO

GROUND

ꢂ

R

SENSE

Figure 10. Single-Supply Current Source

Figure 7. A Low-Side Load Current Monitor

A single-supply instrumentation amplifier using one OP727

amplifierisshowninFigure11.FortruedifferenceR3/R4=

R1/R2. The formula for the CMRR of the circuit at dc is CMRR =

20 × log (100/(1–(R2 × R3)/(R1× R4)). It is common to specify the

accuracy of the resistor network in terms of resistor-to-resistor

percentage mismatch. We can rewrite the CMRR equation to

reflect this CMRR = 20 × log (10000/% Mismatch). The key to

high CMRR is a network of resistors that are well matched from

the perspective of both resistive ratio and relative drift. It should

be noted that the absolute value of the resistors and their absolute

drift are of no consequence. Matching is the key. CMRR is 100 dB

with0.1%mismatchedresistornetwork.TomaximizeCMRR,

one of the resistors such as R4 should be trimmed. Tighter match-

ingof two op amps in one package (OP727) offers a significant

boostinperformanceoverthetripleopampconfiguration.

The OP777/OP727/OP747 is very useful in many bridge applica-

tions. Figure 8 shows a single-supply bridge circuit in which its

output is linearly proportional to the fractional deviation (ꢁ) of

the bridge. Note that ꢁ = ΔR/R.

= 300

15V

AR1ꢉV

REF

V

=

ꢈ + 2.5V

O

2R2

ꢆR1

2

ꢈ =

1/4 OP747

R1

6

RG = 10kꢇ

REF

192

2

10.1kꢇ

1Mꢇ

2.5V

4

3

1Mꢇ

REF

192

0.1ꢀF

15V

4

3

R1(1+ꢈ)

V1

10.1kꢇ

R1

V

O

1/4 OP747

R1(1+ꢈ)

R1

1/4 OP747

R3 = 10.1kꢇ

R2 = 1Mꢇ

R2

3.0 V TO 30V

V2

R4 = 1Mꢇ

R1 = 10.1kꢇ

Figure 8. Linear Response Bridge, Single Supply

V

O

1/2 OP727

In systems where dual supplies are available, the circuit of Figure

9 could be used to detect bridge outputs that are linearly related

to the fractional deviation of the bridge.

V1

V2

1/2 OP727

V

= 100 (V2 ꢂ V1)

O

0.02mV V1 ꢂ V2 290mV

2mV 29V

USE MATCHED RESISTORS

V

OUT

Figure 11. Single-Supply Micropower Instrumentation

Amplifier

D

–12–

REV.

OP777/OP727/OP747

OUTLINE DIMENSIONS

3.20

3.00

2.80

8

1

5

4

5.15

4.90

4.65

3.20

3.00

2.80

PIN 1

IDENTIFIER

0.65 BSC

0.95

0.85

0.75

15° MAX

1.10 MAX

0.80

0.55

0.40

0.15

0.05

0.23

0.09

6°

0°

0.40

0.25

COPLANARITY

0.10

COMPLIANT TO JEDEC STANDARDS MO-187-AA

Figure 12. 8-Lead Mini Small Outline Package [MSOP]

(RM-8)

Dimensions shown in millimeters

5.00 (0.1968)

4.80 (0.1890)

8

1

5

4

6.20 (0.2441)

5.80 (0.2284)

4.00 (0.1574)

3.80 (0.1497)

0.50 (0.0196)

0.25 (0.0099)

1.27 (0.0500)

BSC

45°

1.75 (0.0688)

1.35 (0.0532)

0.25 (0.0098)

0.10 (0.0040)

8°

0°

0.51 (0.0201)

0.31 (0.0122)

COPLANARITY

0.10

1.27 (0.0500)

0.40 (0.0157)

0.25 (0.0098)

0.17 (0.0067)

SEATING

PLANE

COMPLIANT TO JEDEC STANDARDS MS-012-AA

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.

Figure 13. 8-Lead Standard Small Outline Package [SOIC_N]

Narrow Body

(R-8)

Dimensions shown in millimeters and (inches)

REV. D

–13–

OP777/OP727/OP747

3.10

3.00

2.90

8

5

4

4.50

4.40

4.30

6.40 BSC

1

PIN 1

0.65 BSC

0.15

0.05

1.20

MAX

8°

0°

0.75

0.60

0.45

0.30

0.19

SEATING

PLANE

COPLANARITY

0.10

0.20

0.09

COMPLIANT TO JEDEC STANDARDS MO-153-AA

Figure 14. 8-Lead Thin Shrink Small Outline Package [TSSOP]

(RU-8)

Dimensions shown in millimeters

8.75 (0.3445)

8.55 (0.3366)

8

7

14

1

6.20 (0.2441)

5.80 (0.2283)

4.00 (0.1575)

3.80 (0.1496)

1.27 (0.0500)

0.50 (0.0197)

0.25 (0.0098)

45°

BSC

1.75 (0.0689)

1.35 (0.0531)

0.25 (0.0098)

0.10 (0.0039)

8°

0°

COPLANARITY

0.10

SEATING

PLANE

1.27 (0.0500)

0.40 (0.0157)

0.51 (0.0201)

0.31 (0.0122)

0.25 (0.0098)

0.17 (0.0067)

COMPLIANT TO JEDEC STANDARDS MS-012-AB

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.

Figure 15. 14-Lead Standard Small Outline Package [SOIC_N]

Narrow Body

(R-14)

Dimensions shown in millimeters and (inches)

–14–

REV. D

OP777/OP727/OP747

5.10

5.00

4.90

14

8

7

4.50

4.40

4.30

6.40

BSC

1

PIN 1

0.65 BSC

1.05

1.00

0.80

1.20

MAX

0.20

0.09

0.75

0.60

0.45

8°

0°

0.15

0.05

COPLANARITY

0.10

SEATING

PLANE

0.30

0.19

COMPLIANT TO JEDEC STANDARDS MO-153-AB-1

Figure 16. 14-Lead Thin Shrink Small Outline Package [TSSOP]

(RU-14)

Dimensions shown in millimeters

ORDERING GUIDE

Model¹

OP727AR

OP727AR-REEL

OP727AR-REEL7

OP727ARUZ

OP727ARUZ-REEL

OP727ARZ

OP727ARZ-REEL

OP727ARZ-REEL7

OP747ARU

OP747ARU-REEL

OP747ARUZ

OP747ARUZ-REEL

OP747ARZ

OP747ARZ-REEL

OP747ARZ-REEL7

OP777ARMZ

Temperature Range

–40°C to +85°C

Package Description

8-Lead SOIC_N

8-Lead TSSOP

8-Lead SOIC_N

14-Lead TSSOP

14-Lead SOIC

Package Option

Branding

R-8

RU-8

R-8

RU-14

R-14

RM-8

R-8

14-Lead SOIC

8-Lead MSOP

8-Lead SOIC_N

A1A

OP777ARMZ-REEL

OP777ARZ

OP777ARZ-REEL

OP777ARZ-REEL7

R-8

¹Z = RoHS Compliant Part.

REV. D

–15–

OP777/OP727/OP747

REVISION HISTORY

10/11—Rev. C to Rev. D

Changed Single Supply Operation from 2.7 V to 30 V to

3.0 V to 30 V...................................................................................... 1

Changed Dual Supply Operation from 1.3ꢀ V to 1ꢀ V to

1.ꢀ V to 1ꢀ V................................................................................. 1

Changes to General Description Section ...................................... 1

Added Similar Low Power Products Table.................................... 1

Changes to Supply Voltage Section, Input Common-Mode

Voltage Range Section, and Figure 1............................................ 10

Changes to Figure ꢀ........................................................................ 11

Changes to Figure 10 and Figure 11............................................. 12

Updated Outline Dimensions....................................................... 13

Changes to Ordering Guide .......................................................... 1ꢀ

9/01—Rev. B to Rev. C

Addition of text to Applications Section ....................................... 1

Addition of 8-Lead SOIC (R-8) Package ....................................... 1

Addition of text to General Description........................................ 1

Addition of package to Ordering Guide........................................ 2

registered trademarks are the property of their respective owners.

D02051-0-10/11(D)

–16–

REV. D


型号：	OP747ARU-REEL
厂家：	ADI
描述：	Precision Micropower Single-Supply Operational Amplifiers 精密微功耗，单电源运算放大器运算放大器放大器电路光电二极管
文件：	总16页 (文件大小：211K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

OP747ARU-REEL [ADI]

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