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FEATURES

n

Low Offset Voltage: 750μV Maximum

n

Low Offset Drift: 5μV/°C Maximum

n

Low Input Bias Current:

 

1pA (Typical at 25°C)

 

40pA (≤85°C)

n

Rail-to-Rail Inputs and Outputs

n

2.5V to 5.5V Operation Voltage

n

Gain Bandwidth Product: 1.5MHz

n

CMRR: 70dB Minimum

n

PSRR: 94dB Minimum

n

Supply Current: 110μA per Amplifier

n

Shutdown Current: 1.1μA per Amplifier

n

Available in 8-Lead MSOP and 10-Lead DFN

 

Packages (LTC6084) and 16-Lead SSOP and DFN

 

Packages (LTC6085)

APPLICATIONS

n Portable Test Equipment

n Medical Equipment

n Consumer Electronics

n Data Acquisition

Dual/Quad 1.5MHz, Rail-to-Rail, CMOS Amplifiers

DESCRIPTION

TheLTC®6084/LTC6085aredual/quad,lowcost,lowoffset, rail-to-railinput/output,unity-gainstableCMOSoperational amplifiers that feature 1pA of input bias current.

A 1.5MHz gain bandwidth, and 0.5V/μs slew rate, along with the wide supply range and a low 0.75mV offset, make the LTC6084/LTC6085 useful in an extensive variety of applications from data acquisition to medical equipment and consumer electronics. The 110μA supply current and the shutdownmodeareidealforsignalprocessingapplications which demand performance with minimal power.

The LTC6084/LTC6085 have an output stage which swings within 5mV of either supply rail to maximize signal dynamic range in low supply applications. The input common mode range includes the entire supply voltage. These op amps are specified on power supply voltages of 2.5V and 5V from –40°C to 125°C. The dual amplifier LTC6084 is available in 8-lead MSOP and 10-lead DFN packages. The quad amplifier LTC6085 is available in 16-lead SSOP and DFN packages.

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

Shock Sensor Amplifier

 

 

 

200k

 

 

20M

470pF

 

 

 

 

3V

 

 

20M

 

 

 

 

1/2

 

2k

*

 

 

LTC6084

 

100k

 

VOUT = 120mV/g

 

+

 

3V

 

 

 

100k

 

 

 

 

 

0.22μF

 

 

 

 

 

 

 

60845 TA01

 

 

7Hz TO 5kHz

 

*SHOCK SENSOR MURATA ERIE PKGS-OOMX1 www.murata.com

Input Bias Current

vs Common Mode Voltage

 

10000

VS = 5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(pA)

1000

 

 

 

 

TA

= 125°C

 

 

 

 

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

 

 

 

CURRENT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TA = 85°C

 

 

 

10

 

 

 

 

 

 

 

 

 

 

BIAS

 

 

 

 

 

TA = 25°C

 

 

 

1

 

 

 

 

 

 

 

 

 

 

INPUT

 

 

 

 

 

 

 

 

 

 

0.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.01

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

 

0

 

 

 

COMMON MODE VOLTAGE (V)

 

 

 

 

 

 

 

 

 

 

 

 

60845 TA01b

60845fa

1

LTC6084/LTC6085

ABSOLUTE MAXIMUM RATINGS (Note 1)

Total Supply Voltage (V+ to V) ...................................

6V

Input Voltage......................................................

Vto V+

Input Current........................................................

±10mA

SHDNA/SHDNB Voltage.....................................

Vto V+

Output Short-Circuit Duration (Note 2) ............

Indefinite

Operating Temperature Range (Note 3)

 

LTC6084C/LTC6085C ...........................

–40°C to 85°C

LTC6084H/LTC6085H.........................

–40°C to 125°C

Specified Temperature Range (Note 4)

 

LTC6084C/LTC6085C ...............................

0°C to 70°C

LTC6084H/LTC6085H...........................

–40°C to 125°

Junction Temperature ...........................................

150°C

Storage Temperature Range...................

–65°C to 125°C

Lead Temperature (Soldering, 10 sec)

 

MS8, GN Only...................................................

300°C

PIN CONFIGURATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TOP VIEW

 

 

 

 

 

TOP VIEW

 

 

OUTA

1

 

 

 

10

V+

OUTA

1

 

 

8 V+

–INA

2

 

 

9

OUTB

–INA

2

A

 

7 OUTB

+INA

3

+A

11

8

–INB

+INA

3

+

6 –INB

V

4

 

 

B

7

+INB

V

4

 

B

5 +INB

 

 

+

 

+

SHDNA

5

 

 

 

6

SHDNB

 

 

MS8 PACKAGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8-LEAD PLASTIC MSOP

 

 

 

DD PACKAGE

 

 

TJMAX = 150°C, θJA = 200°C/W

 

 

 

 

10-LEAD (3mm × 3mm) PLASTIC DFN

 

 

 

 

 

 

TJMAX = 150°C, θJA = 43°C/W

 

 

 

 

 

 

EXPOSED PAD (PIN 11) IS V, MUST BE SOLDERED TO PCB

 

 

TOP VIEW

 

 

 

 

TOP VIEW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTA

1

 

 

16

OUTD

OUTA

1

 

 

 

16

OUTD

 

 

 

 

 

 

 

 

 

–INA

2

15

–IND

–INA

2

 

15

–IND

 

 

 

 

 

 

A

D

 

 

 

 

 

A

D

 

 

+INA

3

+

+

 

14

+IND

+INA

3

+

+

14

+IND

 

 

 

 

 

V+

 

 

 

 

13 V

V+

4

 

 

13 V

4

 

17

 

 

 

 

 

 

 

+INB

5

 

 

12

+INC

+INB

5

+

+

12

+INC

+B

+

 

 

 

C

 

 

 

 

 

B

C

 

 

–INB

6

 

11

–INC

–INB

6

11

–INC

 

 

 

 

 

 

 

 

 

 

 

 

OUTB

7

 

 

10

OUTC

OUTB

7

 

 

 

10

OUTC

 

 

 

 

 

 

 

 

 

NC

8

 

 

9

NC

NC

8

 

 

 

9

NC

 

 

 

 

 

 

 

 

 

GN PACKAGE

DHC PACKAGE

16-LEAD PLASTIC SSOP NARROW

16-LEAD (5mm × 3mm) PLASTIC DFN

TJMAX = 150°C, θJA = 110°C/W

TJMAX = 150°C, θJA = 43°C/W

EXPOSED PAD (PIN 17) IS V, MUST BE SOLDERED TO PCB

 

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

SPECIFIED TEMPERATURE RANGE

 

 

 

 

 

LTC6084CMS8#PBF

LTC6084CMS8#TRPBF

LTDNG

8-Lead Plastic MSOP

0°C to 70°C

 

 

 

 

 

LTC6084HMS8#PBF

LTC6084HMS8#TRPBF

LTDNG

8-Lead Plastic MSOP

–40°C to 125°C

 

 

 

 

 

LTC6084CDD#PBF

LTC6084CDD#TRPBF

LDNH

10-Lead (3mm × 3mm) Plastic DFN

0°C to 70°C

 

 

 

 

 

LTC6084HDD#PBF

LTC6084HDD#TRPBF

LDNH

10-Lead (3mm × 3mm) Plastic DFN

–40°C to 125°C

 

 

 

 

 

60845fa

2

LTC6084/LTC6085

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

SPECIFIED TEMPERATURE RANGE

 

 

 

 

 

LTC6085CGN#PBF

LTC6085CGN#TRPBF

6085

16-Lead Plastic SSOP

0°C to 70°C

 

 

 

 

 

LTC6085HGN#PBF

LTC6085HGN#TRPBF

6085

16-Lead Plastic SSOP

–40°C to 125°C

 

 

 

 

 

LTC6085CDHC#PBF

LTC6085CDHC#TRPBF

6085

16-Lead (5mm × 3mm) Plastic DFN

0°C to 70°C

 

 

 

 

 

LTC6085HDHC#PBF

LTC6085HDHC#TRPBF

6085

16-Lead (5mm × 3mm) Plastic DFN

–40°C to 125°C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 2.5V, V= 0V, VCM = 0.5V unless otherwise noted.

 

 

 

 

 

 

C SUFFIX

 

 

H SUFFIX

 

 

SYMBOL

PARAMETER

CONDITIONS

 

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

 

 

 

VOS

Offset Voltage (Note 5)

LTC6084MS8, LTC6085GN

 

 

300

750

 

300

750

μV

 

 

 

LTC6084DD, LTC6085DHC

 

 

300

1100

 

300

1100

μV

 

 

 

LTC6084MS8, LTC6085GN

l

 

 

900

 

 

1100

μV

 

 

 

LTC6084DD, LTC6085DHC

l

 

 

1350

 

 

1600

μV

 

 

 

 

 

 

 

 

 

 

 

VOS/ T

Input Offset Voltage Drift

 

l

 

2

5

 

2

5

μV/°C

 

(Note 6)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IB

Input Bias Current

Guaranteed by 5V Test

 

 

1

40

 

1

750

pA

 

(Notes 5, 7)

 

l

 

 

 

 

pA

IOS

Input Offset Current

Guaranteed by 5V Test

 

 

0.5

30

 

0.5

150

pA

 

(Notes 5, 7)

 

l

 

 

 

 

pA

en

Input Noise Voltage

f = 1kHz

 

 

31

 

 

31

 

nV/√Hz

 

Density

f = 10kHz

 

 

27

 

 

27

 

nV/√Hz

 

Input Noise Voltage

0.1Hz to 10Hz

 

 

3

 

 

3

 

μVP-P

in

Input Noise Current

 

 

 

0.56

 

 

0.56

 

fA/√Hz

 

Density (Note 8)

 

 

 

 

 

 

 

 

 

 

Input Common Mode

 

l

V

 

V+

V

 

V+

V

 

Range

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CIN

Input Capacitance

f = 100kHz

 

 

5

 

 

5

 

pF

 

 

Differential Mode

 

 

 

 

 

 

 

 

Common Mode

 

 

 

9

 

 

9

 

pF

 

 

 

 

 

 

 

 

 

 

 

CMRR

Common Mode Rejection

0 ≤ VCM ≤ 2.5V

 

64

80

 

64

80

 

dB

 

Ratio

 

l

63

 

 

61

 

 

dB

PSRR

Power Supply Rejection

VS = 2.5V to 5.5V

 

94

115

 

94

115

 

dB

 

Ratio

 

l

91

 

 

89

 

 

dB

VOUT

Output Voltage, High,

No Load

l

 

0.5

5

 

0.5

10

mV

 

(Referred to V+)

ISOURCE = 1mA

l

 

39

85

 

39

100

mV

 

 

 

ISOURCE = 5mA

l

 

220

460

 

220

 

mV

 

 

 

 

 

 

 

 

 

 

 

 

Output Voltage, Low,

No Load

l

 

0.5

5

 

0.5

10

mV

 

(Referred to V)

ISINK = 1mA

l

 

36

85

 

36

100

mV

 

 

 

ISINK = 5mA

l

 

200

460

 

200

 

mV

 

 

 

 

 

 

 

 

 

 

 

AVOL

Large-Signal Voltage Gain

RLOAD = 10k, 0.4V ≤ VOUT ≤ 2.1V

 

400

2000

 

400

2000

 

V/mV

 

 

 

 

l

200

 

 

150

 

 

V/mV

 

 

 

 

 

 

 

 

 

 

 

60845fa

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LTC6084/LTC6085

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 2.5V, V= 0V, VCM = 0.5V unless otherwise noted.

 

 

 

 

 

C SUFFIX

 

 

H SUFFIX

 

 

SYMBOL

PARAMETER

CONDITIONS

 

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

 

 

 

ISC

Output Short-Circuit

Source and Sink

 

7.7

12.5

 

7.7

12.5

 

mA

 

Current

 

l

6

 

 

4.5

 

 

mA

SR

Slew Rate

AV = 1

 

 

0.5

 

 

0.5

 

V/μs

GBW

Gain Bandwidth Product

RLOAD = 50k, VCM = 1.25V

 

0.9

1.5

 

0.9

1.5

 

MHz

 

(fTEST = 10kHz)

 

l

0.7

 

 

0.6

 

 

 

 

 

 

 

 

 

 

 

Φ0

Phase Margin

RL = 10k, CL = 150pF, AV = 1

 

 

45

 

 

45

 

Deg

tS

Settling Time 0.1%

VSTEP = 1V, AV = 1

 

 

6

 

 

6

 

μs

IS

Supply Current

No Load

 

 

110

130

 

110

130

μA

 

(Per Amplifier)

 

l

 

 

140

 

 

145

μA

 

Shutdown Current

Shutdown, VSHDNx ≤ 0.5V

l

 

0.2

0.3

 

0.2

0.5

μA

 

(Per Amplifier)

 

 

 

 

 

 

 

 

 

VS

Supply Voltage Range

Guaranteed by the PSRR Test

l

2.5

 

5.5

2.5

 

5.5

V

 

 

 

 

Channel Separation

fS = 10kHz

 

 

–120

 

 

–120

 

dB

 

Shutdown Logic

SHDNx High

 

1.8

 

 

1.8

 

 

V

 

 

SHDNx Low

 

 

 

0.5

 

 

0.5

V

tON

Turn On Time

VSHDNx = 0.5V to 1.8V

 

 

7

 

 

7

 

μs

tOFF

Turn Off Time

VSHDNx = 1.8V to 0.5V

 

 

1

 

 

1

 

μs

 

Leakage of SHDN Pin

VSHDNx = 0V

l

 

0.2

0.3

 

0.2

0.5

μA

 

 

 

 

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 5V, V= 0V, VCM = 0.5V unless otherwise noted.

 

 

 

 

 

C SUFFIX

 

 

H SUFFIX

 

 

SYMBOL

PARAMETER

CONDITIONS

 

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

 

 

 

VOS

Offset Voltage (Note 5)

LTC6084MS8, LTC6085GN

 

 

300

750

 

300

750

μV

 

 

LTC6084DD, LTC6085DHC

 

 

300

1100

 

300

1100

μV

 

 

LTC6084MS8, LTC6085GN

l

 

 

900

 

 

1100

μV

 

 

LTC6084DD, LTC6085DHC

l

 

 

1350

 

 

1600

μV

VOS/ T

Input Offset Voltage Drift

 

l

 

2

5

 

2

5

μV/°C

 

(Note 6)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IB

Input Bias Current

 

 

 

1

40

 

1

750

pA

 

(Notes 5, 7)

 

l

 

 

 

 

pA

IOS

Input Offset Current

 

 

 

0.5

30

 

0.5

150

pA

 

(Notes 5, 7)

 

l

 

 

 

 

pA

en

Input Noise Voltage

f = 1kHz

 

 

31

 

 

31

 

nV/√Hz

 

Density

f = 10kHz

 

 

27

 

 

27

 

nV/√Hz

 

Input Noise Voltage

0.1Hz to 10Hz

 

 

3

 

 

3

 

μVP-P

in

Input Noise Current

 

 

 

0.56

 

 

0.56

 

fA/√Hz

 

Density (Note 8)

 

 

 

 

 

 

 

 

 

 

Input Common Mode

 

l

V

 

V+

V

 

V+

V

 

Range

 

 

 

 

 

 

 

 

 

CIN

Input Capacitance

f = 100kHz

 

 

5

 

 

5

 

pF

 

Differential Mode

 

 

 

 

 

 

 

Common Mode

 

 

 

9

 

 

9

 

pF

 

 

 

 

 

 

 

 

 

 

60845fa

4

LTC6084/LTC6085

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 5V, V= 0V, VCM = 0.5V unless otherwise noted.

 

 

 

 

 

 

C SUFFIX

 

 

H SUFFIX

 

 

SYMBOL

PARAMETER

 

CONDITIONS

 

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

 

 

 

CMRR

Common Mode Rejection

0 ≤ VCM ≤ 5V

 

70

84

 

70

84

 

dB

 

Ratio

 

 

l

68

 

 

66

 

 

dB

PSRR

Power Supply Rejection

VS = 2.5V to 5.5V

 

94

115

 

94

115

 

dB

 

Ratio

 

 

l

91

 

 

89

 

 

dB

VOUT

Output Voltage, High,

No Load

l

 

0.5

5

 

0.5

10

mV

 

 

 

 

+

)

ISOURCE = 1mA

l

 

39

85

 

39

100

mV

 

(Referred to V

 

 

 

 

 

 

ISOURCE = 5mA

l

 

220

460

 

220

 

mV

 

 

 

 

 

 

 

 

Output Voltage, Low,

No Load

l

 

0.5

5

 

0.5

10

mV

 

)

ISINK = 1mA

l

 

36

85

 

36

100

mV

 

(Referred to V

 

 

 

 

 

 

ISINK = 5mA

l

 

200

460

 

200

 

mV

 

 

 

 

 

 

 

AVOL

Large-Signal Voltage Gain

RLOAD = 10k, 0.5V ≤ VOUT ≤ 4.5V

 

1000

5000

 

1000

5000

 

V/mV

 

 

 

 

l

400

 

 

300

 

 

V/mV

ISC

Output Short-Circuit

Source and Sink

 

7.7

12.5

 

7.7

12.5

 

mA

 

Current

 

 

l

6

 

 

4.5

 

 

mA

SR

Slew Rate

 

AV = 1

 

 

0.5

 

 

0.5

 

V/μs

GBW

Gain Bandwidth Product

RLOAD = 50k, VCM = 2.5V

 

0.9

1.5

 

0.9

1.5

 

MHz

 

(fTEST = 10kHz)

 

l

0.7

 

 

0.6

 

 

 

 

 

 

 

 

 

 

 

Φ0

Phase Margin

 

RL = 10k, CL = 150pF, AV = 1

 

 

45

 

 

45

 

Deg

tS

Settling Time 0.1%

VSTEP = 1V, AV = 1

 

 

5

 

 

5

 

μs

IS

Supply Current

 

No Load

 

 

110

130

 

110

130

μA

 

(Per Amplifier)

 

 

l

 

 

140

 

 

145

μA

 

Shutdown Current

Shutdown, VSHDNx ≤ 1.2V

l

 

1.1

1.8

 

1.1

2

μA

 

(Per Amplifier)

 

 

 

 

 

 

 

 

 

 

VS

Supply Voltage Range

Guaranteed by the PSRR Test

l

2.5

 

5.5

2.5

 

5.5

V

 

 

 

 

Channel Separation

fS = 10kHz

 

 

–120

 

 

–120

 

dB

 

Shutdown Logic

SHDNx High

 

3.5

 

 

3.5

 

 

V

 

 

 

SHDNx Low

 

 

 

1.2

 

 

1.2

V

 

 

 

 

 

 

 

 

 

 

 

 

tON

Turn On Time

 

VSHDNx = 1.2V to 3.5V

 

 

7

 

 

7

 

μs

tOFF

Turn Off Time

 

VSHDNx = 3.5V to 1.2V

 

 

1

 

 

1

 

μs

 

Leakage of SHDN Pin

VSHDNx = 0V

l

 

0.5

0.9

 

0.5

1.2

μA

 

 

 

 

Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.

Note 2: A heat sink may be required to keep the junction temperature below the absolute maximum. This depends on the power supply voltage and the total output current.

Note 3: The LTC6084C/LTC6085C are guaranteed functional over the operating temperature range of –40°C to 85°C. The LTC6084H/LTC6085H are guaranteed functional over the operating temperature range of –40°C to 125°C.

Note 4: The LTC6084C/LTC6085C are guaranteed to meet specified performance from 0°C to 70°C. The LTC6084C/LTC6085C are designed, characterized and expected to meet specified performance from –40°C to 85°C but are not tested or QA sampled at these temperatures. The LTC6084H/LTC6085H are guaranteed to meet specified performance from –40°C to 125°C.

Note 5: ESD (Electrostatic Discharge) sensitive device. ESD protection devices are used extensively internal to the LTC6084/LTC6085; however, high electrostatic discharge can damage or degrade the device. Use proper ESD handling precautions.

Note 6: This parameter is not 100% tested.

Note 7: This specification is limited by high speed automated test capability. See Typical Performance Characteristic curves for actual performance.

Note 8: Current noise is calculated from in = √2qIB, where q = 1.6 • 10–19 coulombs.

60845fa

5

LTC6084/LTC6085

TYPICAL PERFORMANCE CHARACTERISTICS

 

20

VOS Distribution

 

 

 

 

 

 

1.0

VOS vs VCM

 

 

 

 

 

 

 

 

 

LTC6084 MS8

 

 

 

 

 

 

VS = 5V

 

 

 

 

 

 

 

 

 

30

 

18

 

 

 

 

 

 

0.8

 

 

 

 

 

 

 

 

 

28

 

VS = 5V

 

 

 

 

 

 

TA = 25°C

 

 

 

 

 

 

 

 

26

 

16

VCM = 0.5V

 

 

 

 

 

 

0.6

REPRESENTATIVE PARTS

 

 

 

 

 

PERCENTAGE OF UNITS (%)

 

 

 

 

 

 

 

 

 

 

 

24

TA = 25°C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PERCENT OF UNITS (%)

14

100 UNITS

 

 

 

 

 

 

0.4

 

 

 

 

 

 

 

 

 

 

22

12

 

 

 

 

 

 

 

 

0.2

 

 

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

(mV)

 

 

 

 

 

 

 

 

 

 

18

10

 

 

 

 

 

 

 

0.0

 

 

 

 

 

 

 

 

 

 

16

 

 

 

 

 

 

 

OS

 

 

 

 

 

 

 

 

 

 

14

8

 

 

 

 

 

 

 

–0.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

12

6

 

 

 

 

 

 

 

–0.4

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

4

 

 

 

 

 

 

 

–0.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

–0.8

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

0

 

 

 

 

 

 

 

 

–1.0

 

 

 

 

 

 

 

 

 

 

 

 

–1

–0.8 –0.6 –0.4 –0.2

0

0.2

0.4

0.6

0.8

1

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

0

 

 

 

 

 

 

 

VOS (mV)

 

 

60845 G01

 

 

 

 

 

 

VCM (V)

 

 

 

60845 G02

 

VOS Drift Distribution

 

 

 

 

 

 

 

LTC6084 MS8

 

 

 

 

 

 

 

 

VS = 5V

 

 

 

 

 

 

 

 

VCM = 2.5V

 

 

 

 

 

TA = –40°C TO 125°C

 

 

 

 

 

 

 

 

78 UNITS

–1 –0.5

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

DISTRIBUTION (μV/°C)

60845 G03

 

Input Bias Current

 

Input Bias vs Temperature

vs Common Mode Voltage

Input Noise Voltage vs Frequency

INPUT BIAS CURRENT (pA)

1000

 

 

 

 

 

 

 

10000

VS = 5V

 

 

 

 

 

 

 

 

100

 

 

 

VS = 5V

VS = 5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90

 

 

 

VCM = 2.5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCM = 2.5V

 

 

 

 

 

 

 

 

1000

 

 

 

 

TA

= 125°C

 

 

 

80

 

 

TA = 25°C

 

 

 

 

 

 

 

 

BIASINPUTCURRENT (pA)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOISEINPUTVOLTAGE (nV/√Hz)

 

 

 

 

100

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

 

 

 

70

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TA = 85°C

 

 

 

60

 

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TA = 25°C

 

 

 

40

 

 

 

 

10

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1

 

 

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

40

55

70

85

100

115

130

0.01

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

0

100

1k

10k

100k

25

0

10

 

 

TEMPERATURE (°C)

60845 G04

 

 

COMMON MODE VOLTAGE (V)

 

 

 

 

FREQUENCY (Hz)

 

60845 G06

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60845 G05

 

 

 

 

0.1Hz to 10Hz Output Voltage

 

Output Saturation Voltage

Noise

Input Noise Current vs Frequency

vs Load Current (Output High)

 

VS = 5V

600

 

 

 

(V)

(2μV/DIV)VOLTAGENOISEINPUT

VCM = 2.5V

 

)(fA/√CURRENTNOISEHz

500

VOLTAGESATURATIONHIGHOUTPUT

 

 

 

 

 

400

 

 

 

300

 

 

 

200

 

 

 

100

 

 

 

0

 

1

10

100

1k

10k

100k

TIME (1s/DIV)

 

FREQUENCY (Hz)

 

 

60845 G07

 

 

 

 

 

 

 

60845 G08

5.0

VS = 5V

 

4.5

 

V

CM

= 2.5V

SOURCE

4.0

 

 

 

 

 

 

3.5

3.0

2.5

2.0

1.5

1.0

 

 

 

 

TA = –55°C

 

 

 

 

 

 

 

 

 

 

 

 

0.5

 

 

 

 

TA = 25°C

 

SINK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TA = 125°C

 

 

 

 

 

 

0.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

10

100

0.1

LOAD CURRENT (mA)

60845 G09

60845fa

6

LTC6084/LTC6085

TYPICAL PERFORMANCE CHARACTERISTICS

Supply Current vs Supply Voltage

Supply Current vs Temperature

SUPPLY CURRENT (μA)

140

 

 

 

 

 

 

 

 

 

 

120

 

 

 

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

 

 

 

80

 

 

 

 

 

 

 

 

 

 

60

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

PER AMPLIFIER

 

 

VCM = 0.5V

 

 

 

 

 

 

TA = 25°C

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

0

TOTAL SUPPLY VOLTAGE (V)

SUPPLY CURRENT (μA)

140 PER AMPLIFIER

VCM = 0.5V

130

120

VS = 5V 110

VS = 2.5V

100

90 –55–40–25–10 5 20 35 50 65 80 95 110125

TEMPERATURE (°C)

60845 G10

60845 G11

GAIN (dB)

Open-Loop Gain vs Frequency

CMRR vs Frequency

100

 

 

90

 

 

80

 

PHASE

70

 

 

 

60

 

 

50

 

 

40

 

 

30

GAIN

 

20

 

 

 

10

 

 

0

 

 

–10

 

 

–20

VS = 5V

 

–30

 

VS = 2.5V

 

–40

 

1k

10k

100k

FREQUENCY (Hz)

CL = 5pF

100

 

 

120

VS = 5V

 

 

 

110

RL = 10k

80

 

 

100

VCM = 2.5V

VCM = VS/2

 

 

RL = 1k

TA = 25°C

60

 

 

90

TA = 25°C

 

 

 

80

 

 

 

(DEG)PHASE

CMRR(dB)

 

 

 

40

 

 

40

 

 

70

 

 

 

 

 

60

 

 

20

 

 

50

 

 

 

 

 

 

030

20

 

–20

10

 

 

 

 

 

 

0

 

 

 

 

1M

–40

–10

10k

100k

1M

10M

10M

1k

 

 

 

 

FREQUENCY (Hz)

 

 

 

60845 G12

 

 

 

 

60845 G13

PSRR (dB)

 

PSRR vs Frequency

 

 

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VS = 5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCM = 2.5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

80

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TA = 25°C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

70

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

–10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1k

10k

100k

 

1M

10M

100

 

 

 

 

 

FREQUENCY (Hz)

60845 G14

 

Disabled Output Impedance

Output Impedance vs Frequency

vs Frequency

10000

VS = 5V

 

 

 

 

 

 

1000

 

 

 

VS = 5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1000

VCM = 2.5V

 

 

 

 

 

 

 

 

 

 

VCM = 1V

 

TA = 25°C

 

 

 

 

 

 

 

 

 

 

AV = 1

 

(Ω)

100

 

 

 

 

 

 

 

(kΩ)

100

 

 

 

TA = 25°C

 

 

 

 

 

 

 

 

 

 

 

 

OVERSHOOT(%)

IMPEDANCEOUTPUT

10

 

AV

= 10

 

 

 

 

IMPEDANCEOUTPUT

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AV = 2

 

 

 

 

 

 

 

 

 

 

 

 

 

AV = 1

 

 

10

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.001

 

1k

10k

100k

1M

10M

100M

 

0.1

1k

10k

100k

1M

10M

 

100

 

100

 

 

 

 

FREQUENCY (Hz)

 

 

 

 

 

FREQUENCY (Hz)

 

 

 

 

 

 

 

 

 

60845 G15

 

 

 

 

 

60845 G16

Capacitive Load Handling

40

VS = 5V

35VCM = 2.5V AV = 1

30

 

RS = 10Ω

25

RS

20

+

RS = 50Ω

CL

15

 

 

10

5

0

10 100 1000 CAPACITIVE LOAD (pF)

60845 G17

60845fa

7

LTC6084/LTC6085

TYPICAL PERFORMANCE CHARACTERISTICS

OVERSHOOT (%)

 

Capacitive Load Handling

 

50

VS = 5V

 

 

 

45

 

 

 

VCM = 2.5V

 

 

40

AV = –1

 

RS = 10Ω

 

35

 

 

 

 

 

 

 

30

 

 

RS = 50Ω

25

 

 

 

 

 

 

20

 

 

1k

 

 

 

 

 

15

 

 

 

 

10

 

 

RS

 

 

 

1k

 

5

 

 

+

CL

0

10

100

1000

10000

 

 

 

CAPACITIVE LOAD (pF)

 

 

 

 

 

60845 G18

CHANNEL SEPARATION (dB)

Channel Separation vs Frequency

–90

VS = 5V –95 VCM = 2.5V

TA = 25°C

–100

–105

–110

–115

–120

–125

–130

–135 0.001 0.01 0.1 1 10

FREQUENCY (MHz)

60845 G19

Total Harmonic Distortion and

Noise vs Frequency

 

1

 

 

 

 

 

VS = 3V

 

 

 

 

VCM = 1.5V

 

 

 

 

RL = 10k

 

 

 

(%)

0.1

 

 

 

 

NOISE

 

AV = –2, VIN = 1VP-P

 

 

 

AV = 2, VIN = 1VP-P

 

 

AND

 

 

 

 

 

 

 

 

THD

0.01

 

 

 

 

 

 

 

 

 

 

AV = 1, VIN = 2VP-P

 

 

 

 

 

 

 

AV = 1,

 

 

0.001

 

 

VIN = 1VP-P

 

 

0.1

1

10

100

 

0.01

FREQUENCY (kHz)

60845 G20

Total Harmonic Distortion and

Noise vs Frequency

 

1

 

 

 

 

 

VS = 5V

 

 

 

 

 

VCM = 2.5V

 

 

 

 

RL = 10k

 

 

 

 

(%)

0.1

 

 

 

 

 

AV

= 2, VIN = 1VP-P

 

NOISE

 

 

0.01

 

 

 

 

AND

 

 

 

 

AV = –2, VIN = 1VP-P

 

 

THD

 

 

0.001

 

 

 

 

 

 

 

 

 

 

AV = 1, VIN = 2VP-P

AV = 1, VIN = 1VP-P

0.0001

0.1

1

10

100

 

0.01

FREQUENCY (kHz)

60845 G21

THD AND NOISE (%)

Total Harmonic Distortion and

Noise vs Output Voltage

10

RL = 10k VCM = VS/2

1 AV = 1

VS = 3V AT 20kHz

0.1

VS = 5V AT 20kHz

0.01

VS = 3V AT 1kHz

0.001

VS = 5V AT 1kHz

0.0001 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

OUTPUT VOLTAGE (VP-P)

60845 G22

THD AND NOISE (%)

Total Harmonic Distortion and

Noise vs Load Resistance

0.1

AV = 1 VCM = VS/2 AT 1kHz

0.01

VS = 3V, VIN = 1VP-P

0.001

VS = 5V, VIN = 2VP-P

0.0001

0.1 1 10 100 LOAD RESISTANCE TO GROUND (kΩ)

60845 G23

Small Signal Response

Small Signal Response

Large Signal Response

100mV/DIV

100mV/DIV

1V/DIV

2μs/DIV

 

2μs/DIV

 

20μs/DIV

VS = 5V

60845 G24

VS = 5V

60845 G25

VS = 5V

AV = 1

 

AV = 1

 

AV = 1

RL = ∞

 

RL = ∞

 

RL = ∞

 

 

CL = 220pF

 

 

60845 G26

60845fa

8

LTC6084/LTC6085

TYPICAL PERFORMANCE CHARACTERISTICS

Large Signal Response

Large Signal Response

Large Signal Response

1V/DIV

1V/DIV

1V/DIV

20μs/DIV

 

20μs/DIV

 

VS = 5V

20μs/DIV

VS = 5V

60845 G27

VS = 5V

60845 G28

60845 G29

AV = –1

 

AV = 1

 

AV = –1

 

RL = 1k

 

RL = ∞

 

RL = 1k

 

PIN FUNCTIONS

OUT: Amplifier Output.

–IN: Inverting Input.

+IN: Noninverting Input.

V+: Positive Supply.

V: Negative Supply.

SHDNA: Shutdown Pin of Amplifier A, active low and only available with the LTC6084DD. An internal current source pulls the pin to V+ when floating.

SHDNB: Shutdown Pin of Amplifier B, active low and only available with the LTC6084DD. An internal current source pulls the pin to V+ when floating.

NC: Not Internally Connected.

Exposed Pad: Connected to V.

60845fa

9

LTC6084/LTC6085

APPLICATIONS INFORMATION

 

 

OUT

NO SOLDER MASK

NO LEAKAGE

LTC6084

OVER THE GUARD RING

CURRENT

IN

 

R

 

 

 

IN+

LEAKAGE

 

 

CURRENT

 

 

 

GUARD

V

 

RING

60845 F01

 

 

 

OUT

R

LTC6084

R

IN

 

VIN

 

 

IN+

GND

V

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Figure 1. Sample Layout. Unity-Gain Configuration. Using Guard Ring to Shield High Impedance Input from Board Leakage

Figure 2. Sample Layout. Inverting Gain Configuration. Using Guard Ring to Shield High Impedance Input from Board Leakage

Rail-to-Rail Input

TheinputstageofLTC6084/LTC6085combinesbothPMOS and NMOS differential pairs, extending its input common mode voltage to both positive and negative supply voltages. At high input common mode range, NMOS pair is on. At low common mode range, the PMOS pair is on. The transition happens when the common voltage is between 1.3 and 0.9V below the positive supply.

Achieving Low Input Bias Current

The DD and DHC packages are leadless and make contact to the PCB beneath the package. Solder flux used during the attachment of the part to the PCB can create leakage current paths and can degrade the input bias current performance of the part. All inputs are susceptible because the backside paddle is connected to Vinternally. As the input voltage or Vchanges, a leakage path can be formed and alter the observed input bias current. For lowest bias current use the LTC6084/LTC6085 in the leaded MSOP/GN package. With fine PCB design rules, you can also provide a guard ring around the inputs.

Forexample,inhighsourceimpedanceapplicationssuchas pH probes, photo diodes, strain gauges, etc., the low input bias current of these parts requires a clean board layout to minimize additional leakage current into a high impedance signalnode.Amere100GΩofPCboardresistancebetween a 5V supply trace and input trace near ground potential adds 50pA of leakage current. This leakage is far greater

than the bias current of the operational amplifier. A guard ring around the high impedance input traces driven by a low impedance source equal to the input voltage prevents such leakage problems. The guard ring should extend as far as necessary to shield the high impedance signal from any and all leakage paths. Figure 1 shows the use of a guard ring in a unity-gain configuration. In this case the guard ring is connected to the output and is shielding the high impedance noninverting input from V. Figure 2 shows the inverting gain configuration.

Rail-to-Rail Output

The output stage of the LTC6084/LTC6085 swings within 5mV of the supply rails when driving high impedance loads, in other words when no DC load current is present. See the Typical Performance Characteristics for curves of output swing versus load current. The class AB design of the output stage enables the op amp to supply load currents which are much greater than the quiescent supply current. For example, the room temperature short-circuit current is typically 12.5mA.

Capacitive Load

LTC6084/LTC6085candriveacapacitiveloadupto300pFin unity gain. The capacitive load driving capability increases as the amplifier is used in higher gain configurations. A small series resistance between the output and the load further increases the amount of capacitance the amplifier can drive.

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