LTC6078CMS8#TR全新原装原理图各脚功能电路原理芯片引脚定义-中国IC网-芯三七

LTC6078/LTC6079

Micropower Precision,

Dual/Quad CMOS

Rail-to-Rail Input/Output Ampliﬁers

U

DESCRIPTIO

FEATURES

■

Maximum Offset Voltage of 25µV (25°C)

The LTC^®6078/LTC6079 are dual/quad, low offset, low

noise operational ampliﬁers with low power consumption

and rail-to-rail input/output swing.

■

Maximum Offset Drift of 0.7µV/°C

■

Maximum Input Bias:

1pA (25°C)

50pA (≤85°C)

Input offset voltage is trimmed to less than 25µV and the

CMOS inputs draw less than 50pA of bias current. The low

offset drift, excellent CMRR, and high voltage gain make

it a good choice for precision signal conditioning.

■

Micropower: 54µA per Amp

95dB CMRR (Min)

100dB PSRR (Min)

Input Noise Voltage Density: 16nV/√Hz

Rail-to-Rail Inputs and Outputs

2.7V to 5.5V Operation Voltage

LTC6078 Available in 8-Lead MSOP and 10-Lead DFN

Packages; LTC6079 Available in 16-Lead SSOP and

DFN Packages

■

Eachampliﬁerdrawsonly54µAcurrentona3Vsupply.The

micropower,rail-to-railoperationoftheLTC6078/LTC6079

is well suited for portable instruments and single supply

applications.

The LTC6078/LTC6079 are speciﬁed on power supply

voltages of 3V and 5V from –40 to 125°C. The dual am-

pliﬁer LTC6078 is available in 8-lead MSOP and 10-lead

DFN packages. The quad ampliﬁer LTC6079 is available

in 16-lead SSOP and DFN packages.

U

APPLICATIO S

■

Photodiode Ampliﬁer

High Impedance Sensor Ampliﬁer

Microvolt Accuracy Threshold Detection

Instrumentation Ampliﬁers

Battery Powered Applications

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners. Patent Pending.

■

U

TYPICAL APPLICATIO

Thermocouple Signal Conditioner

V

Distribution

OS

14

12

10

8

LTC6078MS8

5V

SMT

1/4W

150k

V

= 3V

S

CM

NORMALLY

FLOATING

= 0.5V

T

= 25°C

A

+

1/2

LTC6078

0.1µF

OUT = 10mV/°C

0°C TO 500°C 0.5°C

OMEGA

5TC-TT-K-30-36

THERMOCOUPLE

–

SMT

1/4W

150k

5V

6

2.49M

1k

K

40.6µV/°C

4

10k

LT1025

100pF

2

5.6pF

60789 TA01a

0

AMPLIFIER PROTECTED TO 190V, ACCIDENTAL CONTACT

–11 –9 –7 –5 –3 –1

1

3

5

7

9

V

(µV)

OS

60789 TA01b

60789fa

1

LTC6078/LTC6079

W W U W

ABSOLUTE AXI U RATI GS

(Note 1)

+

–

Total Supply Voltage (V to V )...................................6V

Speciﬁed Temperature Range (Note 4)

–

+

Input Voltage...................................................... V to V

LTC6078C, LTC6079C.............................. 0°C to 70°C

LTC6078I, LTC6079I ............................ –40°C to 85°C

LTC6078H, LTC6079H........................ –40°C to 125°C

Junction Temperature

DFN Packages................................................... 125°C

All Other Packages............................................ 150°C

Storage Temperature Range

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

Operating Temperature Range (Note 3)

LTC6078C, LTC6079C.......................... –40°C to 85°C

LTC6078I, LTC6079I ............................ –40°C to 85°C

LTC6078H, LTC6079H........................ –40°C to 125°C

(Not Available in DFN Package)

DFN Packages.................................... –65°C to 125°C

All Other Packages............................. –65°C to 150°C

Lead Temperature (Soldering, 10 Sec).................. 300°C

U

W

U

PACKAGE/ORDER I FOR ATIO

ORDER PART

NUMBER

DD PART

MARKING*

TOP VIEW

LTC6078CDD

LTC6078IDD

LBBB

+

OUTA

–INA

+INA

1

2

3

4

5

10

9

V

TOP VIEW

+

OUTB

–INB

+INB

SHDN_B

OUTA 1

–INA 2

8 V

7 OUTB

6

5

A

ORDER PART

NUMBER

MS8 PART

MARKING*

8

A

B

+INA 3

–INB

+INB

–

B

V

7

–

V

4

SHDN_A

6

MS8 PACKAGE

8-LEAD PLASTIC MSOP

LTC6078ACMS8

LTC6078CMS8

LTC6078AIMS8

LTC6078IMS8

LTC6078AHMS8

LTC6078HMS8

LTAJZ

DD PACKAGE

10-LEAD (3mm × 3mm) PLASTIC DFN

T

= 150°C, θ = 200°C/W

JMAX

JA

T

= 125°C, θ = 43°C/W

JMAX

JA

–

UNDERSIDE METAL CONNECTED TO V

TOP VIEW

ORDER PART

NUMBER

DHC PART

MARKING*

TOP VIEW

OUTA

–INA

+INA

1

2

3

4

5

6

7

8

16 OUTD

15 –IND

OUTA

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

OUTD

A

B

D

C

–INA

+INA

–IND

+IND

A

B

D

C

LTC6079CDHC

LTC6079IDHC

6079

14 +IND

–

+

V

13 V

+

–

V

+INB

–INB

OUTB

NC

12 +INC

11 –INC

10 OUTC

ORDER PART

NUMBER

GN PART

MARKING

+INB

–INB

OUTB

NC

+INC

–INC

OUTC

NC

LTC6079CGN

LTC6079IGN

LTC6079HGN

6079

6079I

6079H

9

NC

DHC PACKAGE

16-LEAD (5mm × 3mm) PLASTIC DFN

= 125°C, θ = 43°C/W

GN PACKAGE

16-LEAD PLASTIC SSOP

= 150°C, θ = 110°C/W

T

JMAX

JA

T

JMAX

JA

–

UNDERSIDE METAL CONNECTED TO V

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

Consult LTC Marketing for parts speciﬁed with wider operating temperature ranges.

*The temperature grades and parametric grades are identiﬁed by a label on the shipping container.

60789fa

2

LTC6078/LTC6079

The

●

denotes the speciﬁcations which apply over the full operating

ELECTRICAL CHARACTERISTICS

+

–

temperature range, otherwise speciﬁcations are at T = 25°C. Test conditions are V = 3V, V = 0V, V = 0.5V unless otherwise noted.

A

CM

SYMBOL PARAMETER

CONDITIONS

C, I SUFFIXES

H SUFFIX

TYP

UNITS

MIN

TYP

MAX

MIN

MAX

V

Offset Voltage (Note 5)

LTC6078MS8, LTC6078AMS8, LTC6079GN

OS

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

= 0.5V, 2.5V

= 0.5V

7

25

30

7

25

μV

LTC6078DD, LTC6079DHC

LTC6078AMS8

LTC6078MS8

7

●

20

25

30

35

70

25

30

35

95

135

165

= 0.5V

97

LTC6079GN

= 0.5V

115

120

150

LTC6078DD

LTC6079DHC

= 0.5V

●

ΔV ⁄ΔT Input Offset Voltage Drift

LTC6078AMS8

LTC6078MS8

LTC6078DD, LTC6079GN

LTC6079DHC

+

0.2

0.7

1.1

1.4

1.8

0.2

0.3

0.7

1.1

1.4

μV/°C

OS

(Note 5)

0.3

I

Input Bias Current

(Note 6)

V

= V /2

0.2

10

1

50

0.2

150

1

350

pA

B

CM

+

●

= V /2

+

Input Offset Current

(Note 6)

V

= V /2

0.1

0.5

0.1

10

pA

OS

CM

+

= V /2

25

100

e

n

Input Noise Voltage

0.1Hz to 10Hz

1

µV

P-P

Input Noise Voltage Density

f = 1kHz

f = 10kHz

18

16

18

16

nV/√Hz

i

Input Noise Current Density

(Note 8)

0.56

fA/√Hz

n

–

+

–

+

●

Input Common Mode Range

Differential Input Capacitance

V

pF

C

10

18

10

18

DIFF

Common Mode Input

Capacitance

CM

CMRR

Common Mode Rejection

Ratio

All Packages

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

= 0V to 3V

= 0V to 1.7V

= 0V to 3V

= 0V to 1.7V

= 0V to 3V

= 0V to 1.7V

= 0V to 3V

= 0V to 1.7V

95

87

91

85

89

84

88

83

87

110

105

103

102

100

102

95

87

91

85

89

84

88

110

103

100

102

100

102

dB

●

LTC6078AMS8

LTC6078MS8

LTC6079GN

LTC6078DD, LTC6079DHC

PSRR

Power Supply Rejection Ratio V = 2.7V to 5.5V

100

97

120

100

97

120

dB

S

●

V

OUT

Output Voltage, High

No Load

SOURCE

1

mV

+

●

(Referred to V )

I

= 0.2mA

= 2mA

35

350

15

40

400

15

150

Output Voltage, Low

No Load

1

mV

–

●

(Referred to V )

I

= 0.2mA

10

30

300

10

35

350

SINK

= 2mA

= 10k, 0.5V ≤ V ≤ 2.5V

OUT

100

●

A

VOL

Large-Signal Voltage Gain

R

LOAD

115

130

110

125

dB

●

I

Output Short-Circuit Current Source

Sink

5

7

10

14

4

6

10

14

mA

SC

SR

Slew Rate

A = 1

0.05

750

0.05

750

V/μs

V

GBW

Gain-Bandwidth Product

R = 100k

L

420

360

420

320

kHz

●

(f

TEST

= 10kHz)

Φ

Phase Margin

R = 10k, C = 200pF

66

24

66

24

Deg

μs

0

L

t

Settling Time 0.1%

A = 1, 1V Step

V

S

60789fa

3

LTC6078/LTC6079

ELECTRICAL CHARACTERISTICS ^The

●

denotes the speciﬁcations which apply over the full operating

+

–

temperature range, otherwise speciﬁcations are at T = 25°C. Test conditions are V = 3V, V = 0V, V = 0.5V unless otherwise noted.

A

CM

SYMBOL PARAMETER

CONDITIONS

C, I SUFFIXES

H SUFFIX

TYP

UNITS

MIN

TYP

MAX

MIN

MAX

I

Supply Current

(per Ampliﬁer)

No Load

54

72

78

54

72

80

μA

S

●

Shutdown Current

(per Ampliﬁer)

Shutdown, V

≤ 0.8V, LTC6078DD

0.3

1

μA

SHDN

●

V

S

Supply Voltage Range

Channel Separation

Shutdown Logic

Guaranteed by the PSRR Test

f = 10kHz, R = 10k

2.7

2

5.5

2.7

2

5.5

0.8

V

–110

dB

s

L

●

SHDN High, LTC6078DD

SHDN Low, LTC6078DD

V

0.8

t

Turn on Time

V

SHDN

V

SHDN

V

SHDN

= 0.8V to 2V, LTC6078DD

= 2V to 0.8V, LTC6078DD

= 0V, LTC6078DD

50

2

50

2

µs

μA

ON

Turn off Time

OFF

Leakage of SHDN Pin

0.6

The

●

denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at T = 25°C. Test

A

+

–

conditions are V = 5V, V = 0V, V = 0.5V unless otherwise noted.

CM

SYMBOL PARAMETER

CONDITIONS

C, I SUFFIXES

H SUFFIX

TYP

UNITS

MIN

TYP

MAX

MIN

MAX

V

Offset Voltage

LTC6078MS8, LTC6078AMS8, LTC6079GN

OS

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

= 0.5V

10

20

25

30

35

30

35

10

30

μV

LTC6078DD, LTC6079DHC

LTC6078AMS8

LTC6078MS8

●

75

25

30

35

100

140

170

102

120

125

155

LTC6079GN

LTC6078DD

LTC6079DHC

●

ΔV ⁄ΔT Input Offset Voltage Drift

LTC6078AMS8

0.2

0.7

1.1

1.4

1.8

0.2

0.3

0.7

1.1

1.4

μV/°C

OS

(Note 7)

LTC6078MS8

LTC6078DD, LTC6079GN

LTC6079DHC

0.3

+

I

Input Bias Current

Input Offset Current

V

= V /2

0.2

10

1

0.2

1

pA

B

CM

+

●

= V /2

50

150

350

+

V

CM

V

CM

= V /2

0.1

0.5

0.1

10

pA

OS

+

= V /2

25

100

e

n

Input Noise Voltage

0.1Hz to 10Hz

1

µV

P-P

Input Noise Voltage Density

f = 1kHz

f = 10kHz

18

16

18

16

nV/√Hz

i

n

Input Noise Current Density

(Note 8)

0.56

fA/√Hz

–

+

–

+

●

Input Common Mode Range

Differential Input Capacitance

V

pF

C

10

18

10

18

DIFF

Common Mode Input

Capacitance

CM

60789fa

4

LTC6078/LTC6079

ELECTRICAL CHARACTERISTICS ^The

●

denotes the speciﬁcations which apply over the full operating

+

–

temperature range, otherwise speciﬁcations are at T = 25°C. Test conditions are V = 5V, V = 0V, V = 0.5V unless otherwise noted.

A

CM

SYMBOL PARAMETER

CONDITIONS

C, I SUFFIXES

H SUFFIX

TYP

UNITS

MIN

TYP

MAX

MIN

MAX

CMRR

Common Mode Rejection

Ratio

All Packages

LTC6078AMS8

LTC6078MS8

LTC6079GN

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

V

CM

= 0V to 5V

= 0V to 3.7V

= 0V to 5V

= 0V to 3.7V

= 0V to 5V

= 0V to 3.7V

= 0V to 5V

= 0V to 3.7V

91

90

94

88

90

86

90

86

90

105

100

105

100

105

100

105

91

90

94

88

90

86

90

105

100

105

100

105

dB

●

LTC6079GN

LTC6078DD, LTC6079DHC

PSRR

Power Supply Rejection Ratio V = 2.7V to 5.5V

100

97

120

dB

S

●

97

V

Output Voltage, High

No Load

2

mV

OUT

+

(Referred to V )

I

= 0.5mA

= 5mA

50

500

20

55

550

20

●

SOURCE

I

200

SOURCE

Output Voltage, Low

No Load

1

mV

–

(Referred to V )

I

= 0.5mA

15

40

400

15

45

450

●

SINK

= 5mA

= 10k, 0.5V ≤ V ≤ 4.5V

OUT

150

●

A

VOL

Large-Signal Voltage Gain

R

LOAD

115

130

110

125

dB

●

I

Output Short-Circuit Current Source

Sink

14

25

12

25

mA

SC

SR

Slew Rate

A = 1

0.05

750

0.05

750

V/μs

V

GBW

Gain-Bandwidth Product

R = 100k

L

420

360

420

320

kHz

●

(f

TEST

= 10kHz)

Φ

Phase Margin

R = 10k, C = 200pF

66

24

55

66

24

55

Deg

μs

0

L

t

I

Settling Time 0.1%

A = 1, 1V Step

V

S

Supply Current

(per Ampliﬁer)

No Load

74

82

74

84

μA

S

●

Shutdown Current

(per Ampliﬁer)

Shutdown, V

≤ 1.2V, LTC6078DD

1.5

5

1.5

5

μA

SHDN

●

V

S

Supply Voltage Range

Channel Separation

Shutdown Logic

Guaranteed by the PSRR Test

f = 10kHz, R = 10k

2.7

3.5

5.5

2.7

3.5

5.5

V

–110

dB

s

L

●

SHDN High, LTC6078DD

SHDN Low, LTC6078DD

V

1.2

t

Turn on Time

V

SHDN

V

SHDN

V

SHDN

= 1.2V to 3.5V, LTC6078DD

= 0V, LTC6078DD

50

2

50

2

µs

μA

ON

Turn off Time

OFF

Leakage of SHDN Pin

0.6

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 how many ampliﬁers are shorted.

performance from 0°C to 70°C. The LTC6078C/LTC6079C 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

LTC6078I/LTC6079I are guaranteed to meet speciﬁed performance from

–40°C to 85°C. The LTC6078H/LTC6079H are guaranteed to meet speciﬁed

performance from –40°C to 125°C.

Note 5: V and V drift are 100% tested at 25°C and 125°C.

OS

Note 3: The LTC6078C/LTC6079C and LTC6078I/LTC6079I are guaranteed

functional over the operating temperature range of –40°C to 85°C. The

LTC6078H/LTC6079H are guaranteed functional over the operating

temperature range of –40°C to 125°C.

Note 6: I and I are guaranteed by the V = 5V test.

B OS S

Note 7: V drift is guaranteed by the V = 3V test.

OS

S

–19

Note 8: Current noise is calculated from i = √2qI , where q = 1.6 • 10

n

B

coulomb.

Note 4: The LTC6078C/LTC6079C are guaranteed to meet speciﬁed

60789fa

5

LTC6078/LTC6079

U W

TYPICAL PERFOR A CE CHARACTERISTICS

V

vs V

V

vs V

CM

V

Distribution

OS

CM

OS

14

12

10

8

40

30

100

80

LTC6078MS8

V

T

= 3V

= 25°C

V

T

= 5V

= 25°C

S

A

S

A

V

T

= 3V

S

CM

A

= 0.5V

REPRESENTATIVE PARTS

60

= 25°C

20

40

10

20

0

6

–20

–40

–60

–80

–100

–10

–20

–30

–40

4

2

0

–11 –9 –7 –5 –3 –1

1

(µV)

3

5

7

9

0.5

1.0

2.0

0.5 1.0

2.0

4.0

4.5 5.0

3.5

0

2.5

3.0

0

2.5 3.0

1.5

(V)

1.5

V

OS

V

(V)

CM

60789 G01

60789 G02

60789 G03

V

Drift Distribution

Input Bias vs Temperature

Input Bias vs V

CM

OS

50

45

40

35

30

25

20

15

10

5

180

160

140

120

100

80

30

24

LTC6078MS8

V

= 5V

V

= 5V

S

V

T

= 3V

= 0.5V

= –40°C TO 125°C

= 2.5V

CM

S

CM

A

18

12

6

T

= 70°C

–0

A

–6

60

–12

–18

–24

–30

T

= 85°C

A

40

20

0

–0.8 –0.6 –0.4 –0.2

0

0.2 0.4 0.6 0.8

0

25

50

75

100

125

0

1

2

3

4

5

µV/°C

TEMPERATURE (°C)

V

(V)

CM

60789 G04

60789 G06

60789 G05

0.1Hz to 10Hz Output Voltage

Noise

Input Bias vs V

Voltage Noise Spectrum

CM

400

300

90

80

70

60

50

40

30

20

10

0

V

= 5V

= 125°C

V

= 5V

S

A

T

= 0.5V

CM

200

100

–0

–100

–200

–300

–400

V

= 3V

CM

S

= 0.5V

V

= 5V

S

= 0.5V

CM

0

1

2

3

4

5

1

10

100

1k

10k

100k

TIME (5s/DIV)

FREQUENCY (Hz)

60789 G09

V

(V)

CM

60789 G07

60789 G08

60789fa

6

LTC6078/LTC6079

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Output Voltage Swing vs

Load Current

Supply Current vs Supply Voltage

Supply Current vs Temperature

+V

60

50

40

30

20

10

0

65

S

PER AMPLIFIER

V

= 0.5V

CM

+V –0.5

S

SOURCE

60

55

50

45

40

+V –1.0

V

= 5V

= 3V

S

+V –1.5

S

+V –2.0

S

V

= 5V

CM

S

= 0.7V

–V +2.0

S

–V +1.5

S

T

= 125°C

–V +1.0

S

A

PER AMPLIFIER

= 25°C

SINK

–V +0.5

S

V

A

= 0.5V

= –55°C

CM

T

= 25°C

–V

S

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY VOLTAGE (V)

–40 –25 –10

5

20 35 50 65 80 95 110 125

0.01

0.1

1

10

100

LOAD CURRENT (mA)

TEMPERATURE (°C)

60789 G10

60789 G11

60789 G12

Open Loop Gain vs Frequency

CMRR vs Frequency

PSRR vs Frequency

100

80

100

120

100

80

140

120

100

80

R

= 10k

= 100k

V

A

R

= 5V

V

= 5V

CM

T = 25°C

A

L

S

= 0.5V

CM

80

60

40

20

0

T

= 25°C

= 1k

L

60

PHASE

GAIN

40

60

20

40

60

0

20

40

V

C

= 5V

S

= 0.5V

CM

–20

–40

–20

0

20

= 200pF

L

T

= 25°C

A

–40

10M

–20

0

1k

10k

100k

FREQUENCY (Hz)

1M

100

1k

10k

100k

1M

10M

1

10 100 1k 10k 100k 1M 10M

FREQUENCY (Hz)

60789 G13

60789 G14

60789 G15

Output Impedance vs Frequency

Small Signal Transient

Large Signal Transient

10000

1000

100

10

V

A

= 5V

CM

= 25°C

S

= 0.5V

T

A

= 100

V

A

= 10

V

20mV/DIV

1V/DIV

A

= 1

V

1

60789 G17

60789 G18

0.1

20µs/DIV

200µs/DIV

V

R

C

= 5V

V

R

C

= 5V

S

L

S

L

= 10k

0.01

= 100pF

100

1k

10k

FREQUENCY (Hz)

100k

1M

60789 G16

60789fa

7

LTC6078/LTC6079

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Disabled Output Impedence vs

Frequency

Overshoot vs C

Channel Separation vs Frequency

L

50

45

40

35

30

25

20

15

10

5

–100

–105

–110

–115

–120

–125

–130

–135

1000

100

10

V

= 5V

CM

= 10k

V

T

= 5V

CM

= 25°C

V

T

= 5V

S

= 0.5V

CM

R

L

= 25°C

A

= 1

V

A

= 1

V

1

A

= 10

V

0.1

0.01

0

100

1k

10k

100k

1M

10M

10

100

CAPACITIVE LOAD (pF)

1000

100

1k

10k

100k

1M

10M

FREQUENCY (Hz)

60789 G19

60789 G20

60789 G21

U

PI FU CTIO S

OUT: Ampliﬁer Output

–IN: Inverting Input

SHDN_A:ShutdownPinofAmpliﬁerA,activelowandonly

valid for LTC6078DD. An internal current source pulls the

+

pin to V when ﬂoating.

+IN: Noninverting Input

V+: Positive Supply

SHDN_B:ShutdownPinofAmpliﬁerB,activelowandonly

valid for LTC6078DD. An internal current source pulls the

+

pin to V when ﬂoating.

V–: Negative Supply

NC: Not internally connected.

–

Exposed Pad: Connected to V .

60789fa

8

LTC6078/LTC6079

U

W U U

APPLICATIO S I FOR ATIO

Preserving Input Precision

Capacitive Load

Preserving input accuracy of the LTC6078/LTC6079 re-

quires that the application circuit and PC board layout do

not introduce errors comparable or greater than the 10µV

typical offset of the ampliﬁers. Temperature differentials

across the input connections can generate thermocouple

voltages of 10’s of microvolts so the connections to the

input leads should be short, close together and away from

heatdissipatingcomponents. Aircurrentacrosstheboard

can also generate temperature differentials.

LTC6078/LTC6079 can drive capactive load up to 200pF in

unity gain. The capacitive load driving capability increases

as the ampliﬁer is used in higher gain conﬁgurations. A

small series resistance between the ouput and the load

further increases the amount of capacitance the ampliﬁer

can drive.

SHDN Pins

Pins5and6areusedforpowershutdownontheLTC6078

in the DD package. If they are ﬂoating, internal current

sources pull Pins 5 and 6 to V+ and the ampliﬁers operate

normally. Inshutdown, theampliﬁeroutputishighimped-

ance, and each ampliﬁer draws less than 2µA current.

The extremely low input bias currents (0.2pA typical) al-

low high accuracy to be maintained with high impedance

sources and feedback resistors. Leakage currents on the

PC board can be higher than the input bias current. For

example, 10GΩ of leakage between a 5V supply lead and

an input lead will generate 500pA! Surround the input

leads with a guard ring driven to the same potential as the

input common mode to avoid excessive leakage in high

impedance applications.

Whenthechipisturnedon,thesupplycurrentperampliﬁer

is about 35µA larger than its normal values for 50µs.

Rail-to-Rail Input

TheinputstageofLTC6078/LTC6079combinesbothPMOS

and NMOS differential pairs, extending its input common

mode voltage range to both positive and negative supply

voltages. At high input common mode range, the NMOS

pair is on. At low common mode range, the PMOS pair is

on. The transition happens when the common voltage is

between 1.3V and 0.9V below the positive supply.

Input Clamps

Large differential voltages across the inputs over very

long time periods can impact the precisely trimmed input

offset voltage of the LTC6078/LTC6079. As an example,

a 2V differential voltage between the inputs over a period

of 100 hours can shift the input offset voltage by tens

of microvolts. If the ampliﬁer is to be subjected to large

differential input voltages, adding back-to-back diodes

between the two inputs will minimize this shift and retain

the DC precision. If necessary, current-limiting series

resistors can be added in front of the diodes, as shown

in Figure 1. These diodes are not necessary for normal

closed loop applications.

Thermal Hysteresis

Figure2showstheinputoffsethysteresisofLTC6078MS8

for3thermalcyclesfrom–45°Cto90°C. Thetypicaloffset

shift after the 3 cycles is only 1µV.

50

V

= 3V

CM

S

= 0.5V

45

40

35

30

25

20

15

10

5

1ST CYCLE

2ND CYCLE

3RD CYCLE

500Ω

+

500Ω

–

60789 F01

Figure 1. Op Amp with Input Voltage Clamp

0

–5 –4 –3 –2 –1

0

1

2

3

4

5

6

V

CHANGE FROM INITIAL VALUE

OS

60789 F02

Figure 2. V Thermal Hysteresis of LTC6078MS8

OS

60789fa

9

LTC6078/LTC6079

U

W U U

APPLICATIO S I FOR ATIO

PC Board Layout

the fourth side. Figure 3 shows the layout of a LTC6078DD

with slots at three sides.

Mechanical stress on a PC board and soldering-induced

stress can cause the V and V drift to shift. The DD

OS

and DHC packages are more sensitive to stress. A simple

way to reduce the stress-related shifts is to mount the IC

near the short edge of the PC board, or in a corner. The

board edge acts as a stress boundary, or a region where

the ﬂexure of the board is minimum. The package should

always be mounted so that the leads absorb the stress and

not the package. The package is generally aligned with the

leads paralled to the long side of the PC board.

LONG DIMENSION

SLOTS

ThemosteffectivetechniquetorelievethePCboardstress

is to cut slots in the board around the op amp. These slots

can be cut on three sides of the IC and the leads can exit on

60789 F03

Figure 3. Vertical Orientation of LTC6078DD with Slots

W

SI PLIFIED SCHE ATIC

+

V

R1

R2

M10

M11

M8

C1

I1

1µA

+

I2

V

A1

–

+

V

BIAS

M5

V

D4

+IN

D7

+

V

D3

OUTPUT

CONTROL

M6 M7

M1 M2

OUT

D6

–

D8

V

+

V

–IN

–

V

D5

D2

A2

BIAS

GENERATION

SHDN

–

V

C2

D1

NOTE: SHDN IS ONLY AVAILABLE

IN THE DFN10 PACKAGE

M3

M4

M9

–

V

R3

R4

–

60789 SS

V

Simpliﬁed Schematic of the Ampliﬁer

60789fa

10

LTC6078/LTC6079

U

TYPICAL APPLICATIO S

2.7V High Side Current Sense

V

DD

V

DD

R1

+

R

S

1/2

2N7002

LTC6078

–

V

OUT

I

L

R2

LOAD

R2

R1

R2

R1

V

= I

•

• R – V

S

•

OS

OUT

L

0V ≤ V

≤ V – V

DD

60789 TA02

OUT

GS, MOSFET

Low Average Power IR LED Driver

V

DD

V

DD

ON/OFF

HSDL-4220

2N7002

909k

5V

0V

+

1/2

LTC6078

100k

–

SHDN

49.9Ω

VARYING ON DUTY CYCLE REDUCES

AVERAGE POWER CONSUMPTION

60789 TA03

Accelerometer Signal Conditioner

2.5V

COLUMBIA RESEARCH LABS

3021 ACCELERATOR

+

1/2

LTC6078

V

OUT

–

1M

–2.5V

1000pF

V

= 60mV/g

OUT

WHERE g = EARTH'S GRAVITATIONAL CONSTANT

60789 TA04

Photodiode Ampliﬁer

2.5V

1M

–

3.8pF

1/2

TEMD1000

IR PHOTODIODE

V

OUT

LTC6078

+

–2.5V

AT 870nm (IR),

OUT

V

= 600mV/µW RECEIVED POWER

60789 TA05

60789fa

11

LTC6078/LTC6079

U

TYPICAL APPLICATIO S

6 Decade Current Log Ampliﬁer

–

C

+

100Ω

+

–

B

100Ω

33µF

Q1

Q2

100k

133k

V

DD

–

1000pF

A

–

1.58k

D

+

PRECISION

+

RESISTOR PT146

1k

I

IN

V

OUT

LT6650

V

CC

+3500ppm/°C

IN

OUT

GND

60789 TA07

10nA ≤ I ≤ 10mA

IN

1µF

Q1, Q2: DIODES INC. DMMT3906W

A TO D: LTC6079

V

≈ 150mV • log (I ) + 1.23V, I IN AMPS

OUT

IN IN

Humidity Sensor Signal Conditioner

V

DD

5V

SUP

IN

OUT

5.2V TO 20V

LT1761-5

1µF

0.01µF

1µF

SHDN BYP

V

DD

49.9k

100k

V

BIAS

49.9k

100k

M1

GAIN TRIM

1k

BAT54S

75pF

H

V

DD

34.8k

1000pF

100k

–

+

LTC6906

OUT

499k

1k

V

–

B

–

DD

V

100k

OUT

0.1µF

GRD GND

0V TO 5V

A

C

0% TO 100% RH

0.1µF

V

+

BIAS

V

SET DIV

DD

V

DD

10k 47.5k

1M

A TO C: LTC6079

60789 TA08

H: GE PARAMETRICS G-CAP 2 HUMIDITY SENSOR

148pF TO 178pF, 0% TO 90% RH

M1: VN2222L

100k

OFFSET TRIM

60789fa

12

LTC6078/LTC6079

U

TYPICAL APPLICATIO S

LDO Load Balancing

V

BALLAST RESISTANCE:

IN

OUT

1.8V TO 20V

IDENTICAL LENGTH

THERMALLY MATED

WIRE OR PCB TRACE

+

LT1763

0.01µF

10µF

SHDN BYP

FB

R1

2k

R2

2k

⎛

1.22V⎜1 +

⎝

⎞

R1

V

⎟

IN

OUT

LT1763

OUT =

⎠

R2

0.01µF

10µF

SHDN BYP

FB

100Ω

I

LOAD

2k

1k

A

0.1µF

–

+

10k

IN

OUT

LT1763

0.01µF

10µF

SHDN BYP

FB

100Ω

2k

0 ≤ I

≤ 1.5A

OUT

1k

LOAD

0.1µF

1.22V ≤ V

≤ V

DD

V

DD

LDO LOADS MATCH TO WITHIN

1mA WITH 10mΩ OF BALLAST

RESISTANCE (2 INCHES OF AWG

28 GAUGE STRANDED WIRE)

A, B: LTC6078

–

+

B

10k

60789 TA09

pH Probe Ampliﬁer

PRECISION

RESISTOR PT146

1k

+3500ppm/°C

+

–

1k

A

pH

V

CC

–

+

57.6k

V

OUT

B

LT1634

1.25V

1000pF

SENSOR: SENSOREX S200C pH PROBE

LTC6078 INPUT IMPEDANCE ≈ 1TΩ OR GREATER

= 1.25V + 59.2mV • (pH – 7)

60789 TA10

V

OUT

A, B: LTC6078

60789fa

13

LTC6078/LTC6079

U

TYPICAL APPLICATIO S

Thermistor Ampliﬁer with Overtemperature Alarm

V

DD

–

+

1k

T

D

OV

LT1634

1.25V

29.4k

71.5k

0.01µF

200k

+

B

+

–

3200Ω

V

C

–

OUT

+

YSI #44201

THERMOLINEAR

NETWORK

A

6250Ω

100k

–

100k

60789 TA12

143k

20k

178k

50k

H

B

OFFSET TRIM

GAIN TRIM

A TO D: LTC6079, V = 2.7V TO 5.5V, V = GND

DD

SS

V

OV

= 0 → 1V FOR 0°C TO 100°C, LINEAR

OUT

T

→ HIGH WHEN T ≥ 90°C

Precision Sample-and-Hold

LTC6943

V

DD

6

7

9

1

–

LTC6078

A

LTC6078

V

OUT

B

5

4

V

+

IN

0.1µF

I

< 200µA

SUPPLY

14

VOLTAGE DROOP = 130nV/ms TYP

SLEW RATE = 0.05V/ms TYP

ACQ TIME = 84µs TYP TO 0.1%

60789 TA13

S/H

60789fa

14

LTC6078/LTC6079

U

TYPICAL APPLICATIO S

Precision Voltage-Controlled Current Source

V

DD

+

V

IN

1/2

LTC6078

V

IN

–

I

=

OUT

R

SET

< 0.1% AT I

= 1µA

ERROR

OUT

0.68µF

1k

6

7

9

R

SET

1µF

1k

10

I

OUT

11 12

15

LTC6943

14

0.001µF

60789 TA14

60Hz Notch

R2

2.5V

–

R1

1/2

V

OUT

LTC6078

10M

+

V

IN

540pF

270pF

–2.5V

270pF

R2

R1

V

= 1 +

• V

IN

OUT

(

)

5M

NOTCH DEPTH = –60dB AT 60Hz, RTI

60789 TA15

60789fa

15

LTC6078/LTC6079

U

PACKAGE DESCRIPTIO

DD Package

10-Lead Plastic DFN (3mm × 3mm)

(Reference LTC DWG # 05-08-1699)

0.675 0.05

3.50 0.05

2.15 0.05 (2 SIDES)

1.65 0.05

PACKAGE

OUTLINE

0.25 0.05

0.50

BSC

2.38 0.05

(2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

R = 0.115

TYP

6

0.38 0.10

10

3.00 0.10

(4 SIDES)

1.65 0.10

(2 SIDES)

PIN 1

TOP MARK

(SEE NOTE 6)

(DD10) DFN 1103

5

1

0.25 0.05

0.50 BSC

0.75 0.05

0.200 REF

2.38 0.10

(2 SIDES)

0.00 – 0.05

BOTTOM VIEW—EXPOSED PAD

NOTE:

1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).

CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT

2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE

TOP AND BOTTOM OF PACKAGE

60789fa

16

LTC6078/LTC6079

U

PACKAGE DESCRIPTIO

DHC Package

16-Lead Plastic DFN (5mm × 3mm)

(Reference LTC DWG # 05-08-1706)

0.65 0.05

3.50 0.05

1.65 0.05

2.20 0.05 (2 SIDES)

PACKAGE

OUTLINE

0.25 0.05

0.50 BSC

4.40 0.05

(2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

R = 0.115

0.40 0.10

5.00 0.10

(2 SIDES)

TYP

16

9

R = 0.20

TYP

3.00 0.10 1.65 0.10

(2 SIDES)

PIN 1

TOP MARK

(SEE NOTE 6)

PIN 1

NOTCH

(DHC16) DFN 1103

8

1

0.25 0.05

0.50 BSC

0.75 0.05

0.200 REF

4.40 0.10

(2 SIDES)

0.00 – 0.05

BOTTOM VIEW—EXPOSED PAD

NOTE:

1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC

PACKAGE OUTLINE MO-229

2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE

TOP AND BOTTOM OF PACKAGE

60789fa

17

LTC6078/LTC6079

U

PACKAGE DESCRIPTIO

MS8 Package

8-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1660)

0.889 0.127

(.035 .005)

5.23

(.206)

MIN

3.20 – 3.45

(.126 – .136)

3.00 0.102

(.118 .004)

(NOTE 3)

0.52

(.0205)

REF

0.65

(.0256)

BSC

0.42 0.038

(.0165 .0015)

TYP

8

7 6 5

RECOMMENDED SOLDER PAD LAYOUT

3.00 0.102

(.118 .004)

(NOTE 4)

4.90 0.152

(.193 .006)

DETAIL “A”

0.254

(.010)

0° – 6° TYP

GAUGE PLANE

1

2

3

4

0.53 0.152

(.021 .006)

1.10

(.043)

MAX

0.86

(.034)

REF

DETAIL “A”

0.18

(.007)

SEATING

PLANE

0.22 – 0.38

0.127 0.076

(.009 – .015)

(.005 .003)

0.65

(.0256)

BSC

TYP

MSOP (MS8) 0204

NOTE:

1. DIMENSIONS IN MILLIMETER/(INCH)

2. DRAWING NOT TO SCALE

3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.

MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

60789fa

18

LTC6078/LTC6079

U

PACKAGE DESCRIPTIO

GN Package

16-Lead Plastic SSOP (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1641)

.189 – .196*

(4.801 – 4.978)

.045 .005

.009

(0.229)

REF

16 15 14 13 12 11 10 9

.254 MIN

.150 – .165

.229 – .244

.150 – .157**

(5.817 – 6.198)

(3.810 – 3.988)

.0165 .0015

.0250 BSC

RECOMMENDED SOLDER PAD LAYOUT

1

2

3

4

5

6

7

8

.015 .004

(0.38 0.10)

× 45°

.0532 – .0688

(1.35 – 1.75)

.004 – .0098

(0.102 – 0.249)

.007 – .0098

(0.178 – 0.249)

0° – 8° TYP

.016 – .050

(0.406 – 1.270)

.0250

(0.635)

BSC

.008 – .012

GN16 (SSOP) 0204

(0.203 – 0.305)

TYP

NOTE:

1. CONTROLLING DIMENSION: INCHES

INCHES

2. DIMENSIONS ARE IN

(MILLIMETERS)

3. DRAWING NOT TO SCALE

*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD

FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

60789fa

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

19

LTC6078/LTC6079

U

TYPICAL APPLICATIO

DC Accurate Composite Ampliﬁer, Gain of 1000

V

CC

+

–

V

IN

LT1226

V

OUT

1M

V

DD

0.1µF

V

EE

10k

–

100Ω

1/2

LTC6078

V

CC

+

10Ω

10k

2.49k

V

SS

V

DD

LT1634BCS8-5

10Ω

V

SS

CIRCUIT BW ≈ 1.25MHz

e

= 2.6nV/√Hz (RTI) AT 1kHz

n

2.49k

CIRCUIT V = 25µV (MAX) RTI

OS

V

60789 TA06

EE

RELATED PARTS

PART NUMBER

LTC2051/LTC2052 Dual/Quad Zero-Drift Op Amps

LT6011/LT6012 Dual/Quad Precision Op Amps

DESCRIPTION

COMMENTS

3µV V , 30nV/°C V Drift

OS

60µV V , I = 300pA, I = 135µA

OS

B

S

60789fa

LT 0506 REV A • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

20

●

(408) 432-1900 FAX: (408) 434-0507 www.linear.com

型号:	LTC6078CMS8#TRPBF
Brand Name：	Linear Technology
是否Rohs认证：	符合
生命周期：	Transferred
零件包装代码：	MSOP
包装说明：	TSSOP, TSSOP8,.19
针数：	8
制造商包装代码：	MS8
Reach Compliance Code：	compliant
ECCN代码：	EAR99
HTS代码：	8542.33.00.01
风险等级：	6.92
放大器类型：	OPERATIONAL AMPLIFIER
架构：	VOLTAGE-FEEDBACK
最大平均偏置电流 (IIB)：	0.00005 µA
25C 时的最大偏置电流 (IIB)：	0.000001 µA
标称共模抑制比：	102 dB
频率补偿：	YES
最大输入失调电压：	97 µV
JESD-30 代码：	S-PDSO-G8
JESD-609代码：	e3
长度：	3 mm
低-偏置：	YES
低-失调：	YES
微功率：	YES
湿度敏感等级：	1
功能数量：	2
端子数量：	8
最高工作温度：	70 °C
最低工作温度：
封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP
封装等效代码：	TSSOP8,.19
封装形状：	SQUARE
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
包装方法：	TAPE AND REEL
峰值回流温度（摄氏度）：	260
电源：	3/5 V
认证状态：	Not Qualified
座面最大高度：	1.1 mm
标称压摆率：	0.05 V/us
子类别：	Operational Amplifier
最大压摆率：	0.164 mA
供电电压上限：	6 V
标称供电电压 (Vsup)：	3 V
表面贴装：	YES
技术：	CMOS
温度等级：	COMMERCIAL
端子面层：	Matte Tin (Sn)
端子形式：	GULL WING
端子节距：	0.65 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	30
标称均一增益带宽：	750 kHz
最小电压增益：	562000
宽度：	3 mm
Base Number Matches：	1

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