LT1673CS8#TRPBF_技术文档

LT1672/LT1673/LT1674

2µA Max, A_V≥ 5 Single, Dual

and Quad Over-The-Top Precision

Rail-to-Rail Input and Output Op Amps

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FEATURES

DESCRIPTIO

The LT^®1672/LT1673/LT1674 are ultralow power

■

Gain of 5 Stable

■

(I_S≤ 2µA) decompensated (A_V≥ 5) op amps with preci-

sion specifications. The extremely low supply current is

combined with excellent amplifier specifications: input

offset voltage is 375µV maximum with a typical drift of

only 0.4µV/°C, input offset current is 100pA maximum. A

minimumopen-loopgain(A_VOL)of100V/mVensuresthat

gain errors are small. The devices’ characteristics change

little over the supply range of 2.2V to ±15V. Supply

rejection is 90dB and the common mode rejection ratio is

90dB. Operationisspecifiedfor3V, 5Vand±15Vsupplies.

Reverse battery protection (–18V min) and inputs that

operate above the positive supply make the LT1672/

LT1673/LT1674 easy to use in harsh environments.

Low Supply Current: 2µA Max per Amplifier

■

Rail-to-Rail Input and Output

■

Low Offset Voltage: 375µV Max

Over-The-Top^TMInputs Operate Above V⁺

Gain Bandwidth Product: 12kHz

Wide Supply Range: 2.2V to 36V

Single Supply Input Range: –0.3V to 36V

Low Input Bias Current: 250pA

Low Input Offset Current: 20pA

High A_VOL: 100V/mV Minimum Driving 100kΩ Load

Output Sources and Sinks 500µA Load Current

Reverse Battery Protected to 18V

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The low bias currents and offset current of the amplifier

permit the use of megohm level source resistors without

introducing significant errors. Voltage noise at 4µV_P-Pis

remarkably low considering the low supply current. For

unity gain stable versions of these amplifiers, see the

LT1494/LT1495/LT1496.

APPLICATIO S

■

Battery- or Solar-Powered Systems

■

Portable Instrumentation

■

Remote Sensor Amplifier

■

Micropower Filter

Photodiode Amplifier

■

The LT1672 is available in the 8-pin MSOP, PDIP and SO

packages. The LT1673 is available in plastic 8-pin PDIP

and SO-8 packages with the standard dual op amp pinout.

The LT1674 is available in 14-pin PDIP and SO packages.

■

High Impedance Circuits

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

Over-The-Top is a trademark of Linear Technology Corporation.

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TYPICAL APPLICATION

TC V_OSDistribution

Single Supply, 60µW Precision Instrumentation Amplifier

80

120 AMPLIFIERS

5V

V

= ±2.5V

S

70

60

50

40

30

20

10

0

100k*

–40°C to 85°C

V

+

IN1

1M

5V

1/2 LT1673

–

110k

1M

100k

–

+

LT1672

V

OUT

1M

1000pF

110k

1M

–

A

= 100

V

5V

BANDWIDTH = 1kHz

1/2 LT1673

CMRR = 65dB AT 120Hz

0.0047µF

LT1389-2.5

–1.5

–0.9

–0.3

0.3

0.9

1.5

100k*

*500V TRANSIENT PROTECTION

TOTAL SUPPLY CURRENT = 12µA

V

IN2

+

TC V (µV/°C)

OS

1672/3/4 TA01

1672/3/4 TA02

1

LT1672/LT1673/LT1674

W W U W

ABSOLUTE AXI U RATI GS

(Note 1)

Total Supply Voltage (V⁺to V^–) .............................. 36V

Differential Input Voltage ......................................... 36V

Input Current ...................................................... ±10mA

Output Short-Circuit Duration.......................Continuous

Operating Temperature Range (Note 2) .. –40°C to 85°C

Specified Temperature Range (Note 3)... –40°C to 85°C

Storage Temperature Range ................. –65°C to 150°C

Junction Temperature........................................... 150°C

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

U W

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PACKAGE/ORDER I FOR ATIO

ORDER PART

NUMBER

ORDER PART

NUMBER

TOP VIEW

NC

–IN

+IN

1

2

3

4

8

7

6

5

NC

LT1672CMS8

LT1672IMS8

LT1672CN8

LT1672CS8

LT1672IN8

LT1672IS8

NC 1

–IN 2

8 NC

7 V

6 OUT

5 NC

+

V

+

+IN 3

OUT

NC

–

V

4

–

V

MS8 PACKAGE

8-LEAD PLASTIC MSOP

N8 PACKAGE

8-LEAD PDIP

S8 PACKAGE

MS8 PART MARKING

S8 PART MARKING

8-LEAD PLASTIC SO

T_JMAX= 150°C, θ_JA= 250°C/ W

T_JMAX= 150°C, θ_JA= 130°C/ W (N8)

T_JMAX= 150°C, θ_JA= 190°C/ W (S8)

LTFH

LTFJ

1672

1672I

ORDER PART

NUMBER

ORDER PART

NUMBER

TOP VIEW

OUT A

–IN A

+IN A

1

2

3

4

5

6

7

14

13

12

11

10

9

OUT D

–IN D

+IN D

TOP VIEW

+

LT1673CN8

LT1673CS8

LT1673IN8

LT1673IS8

LT1674CN

LT1674CS

LT1674IN

LT1674IS

OUT A

–IN A

+IN A

1

2

3

4

V

8

7

6

5

A

B

D

C

OUT B

–IN B

+IN B

+

–

A

V

B

+IN B

–IN B

OUT B

+IN C

–IN C

OUT C

–

V

N8 PACKAGE

8-LEAD PDIP

S8 PACKAGE

8-LEAD PLASTIC SO

8

S8 PART MARKING

N PACKAGE

14-LEAD PDIP

S PACKAGE

14-LEAD PLASTIC SO

T_JMAX= 150°C, θ_JA= 150°C/ W (N8)

_JMAX= 150°C, θ_JA= 190°C/ W (S8)

1673

1673I

T

T_JMAX= 150°C, θ_JA= 110°C/ W (N)

_JMAX= 150°C, θ_JA= 150°C/ W (S)

T

Consult factory for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

T_A= 25°C, V_S= 5V, 0V; V_S= 3V, 0V; V_CM= V_O= half supply, unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

V = 5V

MIN

TYP

MAX

UNITS

V

Input Offset Voltage

150

200

150

200

375

475

575

µV

OS

S

V = 3V

S

V = 5V, MS8 Package

S

V = 3V, MS8 Package

S

I

Input Bias Current

(Note 5)

250

180

20

4

1000

360

100

pA

nA

pA

B

V

= 10V (Note 6)

CM

Input Offset Current

Input Noise Voltage

(Note 5)

0.1Hz to 10Hz

OS

µV

P-P

2

LT1672/LT1673/LT1674

ELECTRICAL CHARACTERISTICS

T_A= 25°C, V_S= 5V, 0V; V_S= 3V, 0V; V_CM= V_O= half supply, unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

f = 100Hz

MIN

TYP

185

10

500

250

MAX

UNITS

nV/√Hz

fA/√Hz

V/mV

e

Input Noise Voltage Density

Input Noise Current Density

Large-Signal Voltage Gain

n

i

n

A

VOL

V = 5V, V = 0.25V to 4.5V, R = 100k

100

50

S

O

L

V = 3V, V = 0.25V to 2.5V, R = 100k

S

O

L

Input Voltage Range

0

36

V

CMRR

PSRR

Common Mode Rejection Ratio

V

= 0V to 4V, V = 5V

90

74

90

106

95

99

2.1

50

dB

V

mV

V

CM

S

= 0V to 10V, V = 5V

S

Power Supply Rejection Ratio

Minimum Operating Supply Voltage

Output Voltage Swing LOW

V = 2.2V to 12V, V = V = 0.5V

S

CM

O

2.2

100

410

V

OL

V

OH

No Load

I

= 100µA

210

V – 0.035

V – 0.160

SINK

+

Output Voltage Swing HIGH

No Load

= 100µA

V – 0.07

V – 0.32

+

I

SOURCE

I

Short-Circuit Current

Supply Current per Amplifier

Reverse Supply Voltage

Slew Rate

(Note 5)

(Note 6)

0.7

1.3

1.5

mA

µA

V

V/ms

kHz

SC

2

S

I = 10µA per Amplifier

–18

1.6

S

SR

GBW

A = –5, V = ±10V

5

12

V

S

Gain Bandwidth Product

f = 100Hz

The ● denotes the specifications which apply over the temperature range of 0°C ≤ T_A≤ 70°C. V_S= 5V, 0V; V_S= 3V, 0V;

V_CM= V_O= half supply, unless otherwise noted. (Note 3)

SYMBOL PARAMETER

CONDITIONS

V = 5V

MIN

TYP

MAX

UNITS

V

Input Offset Voltage

●

175

225

175

225

425

525

625

µV

OS

S

V = 3V

S

V = 5V, MS8 Package

S

V = 3V, MS8 Package

S

V

TC

Input Offset Voltage Drift

Input Bias Current

(Note 4)

(Note 5)

●

0.4

250

240

20

280

150

2

µV/°C

OS

I

●

1200

500

120

pA

nA

pA

V/mV

B

V

= 10V (Note 6)

CM

Input Offset Current

Large-Signal Voltage Gain

(Note 5)

V = 5V, V = 0.25V to 4.5V, R = 100k

●

OS

A

●

75

40

VOL

S

O

L

V = 3V, V = 0.25V to 2.5V, R = 100k

S

O

L

Input Voltage Range

●

0.2

36

V

CMRR

PSRR

Common Mode Rejection Ratio

V

= 0.2V to 4V, V = 5V

●

89

64

89

106

85

99

2.3

55

225

V – 0.04

V – 0.18

dB

V

mV

V

CM

S

= 0.2V to 10V, V = 5V

S

Power Supply Rejection Ratio

Minimum Operating Supply Voltage

Output Voltage Swing LOW

V = 2.4V to 12V, V = V = 0.5V

●

S

CM

O

2.4

110

450

V

No Load

●

OL

OH

I

= 100µA

SINK

+

Output Voltage Swing HIGH

No Load

= 100µA

●

V – 0.08

V – 0.36

+

I

SOURCE

I

Short-Circuit Current

Supply Current per Amplifier

(Note 5)

(Note 6)

●

0.6

1.1

1.9

mA

µA

SC

2.8

S

3

LT1672/LT1673/LT1674

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the temperature range of –40°C ≤ T_A≤ 85°C. V_S= 5V, 0V; V_S= 3V, 0V;

V_CM= V_O= half supply, unless otherwise noted. (Note 3)

SYMBOL PARAMETER

CONDITIONS

V = 5V

MIN

TYP

MAX

UNITS

V

Input Offset Voltage

●

200

250

200

250

475

575

675

µV

OS

S

V = 3V

S

V = 5V, MS8 Package

S

V = 3V, MS8 Package

S

V

TC

Input Offset Voltage Drift

Input Bias Current

(Note 4)

(Note 5)

●

0.4

250

275

20

215

115

2

µV/°C

OS

I

●

1700

750

170

pA

nA

pA

V/mV

B

V

= 10V (Note 6)

CM

Input Offset Current

Large-Signal Voltage Gain

(Note 5)

V = 5V, V = 0.25V to 4.5V, R = 100k

●

OS

A

●

55

30

VOL

S

O

L

V = 3V, V = 0.25V to 2.5V, R = 100k

S

O

L

Input Voltage Range

●

0.2

36

V

CMRR

PSRR

Common Mode Rejection Ratio

V

= 0.2V to 4V, V = 5V

●

88

62

88

106

75

99

2.6

60

245

V – 0.05

V – 0.19

dB

V

mV

CM

S

= 0.2V to 10V, V = 5V

S

Power Supply Rejection Ratio

Minimum Operating Supply Voltage

Output Voltage Swing LOW

V = 2.7V to 12V, V = V = 0.5V

●

S

CM

O

2.7

120

490

V

No Load

●

OL

OH

I

= 100µA

SINK

+

Output Voltage Swing HIGH

No Load

= 100µA

●

V – 0.10

V – 0.38

+

I

SOURCE

I

Short-Circuit Current

Supply Current per Amplifier

(Note 5)

(Note 6)

●

0.4

0.9

2.1

mA

µA

SC

3.1

S

T_A= 25°C, V_S= ±15V, V_CM= V_O= 0V, unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

Input Offset Voltage

200

575

675

µV

OS

MS8 Package

I

Input Bias Current

Input Offset Current

25

20

1000

100

pA

B

OS

A

Large-Signal Voltage Gain

Input Voltage Range

Common Mode Rejection Ratio

Power Supply Rejection Ratio

Output Voltage Swing LOW

V = ±10V, R = 100k

100

–15

100

96

360

V/mV

V

dB

V

VOL

O

L

21

CMRR

PSRR

V

= –15V to 14V

120

–14.85

–14.75

CM

V = ±5V to ±15V

S

R = 1M

–14.70

–14.50

OL

L

R = 100k

L

V

Output Voltage Swing HIGH

R = 1M

R = 100k

L

14.78

14.62

14.89

14.81

V

OH

L

I

Short-Circuit Current

Supply Current per Amplifier

0.7

1.5

1.9

mA

µA

SC

2.8

S

4

LT1672/LT1673/LT1674

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the temperature range of 0°C ≤ T_A≤ 70°C, V_S= ±15V, V_CM= V_O= 0V,

unless otherwise noted. (Note 3)

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

Input Offset Voltage

●

225

625

725

µV

OS

MS8 Package

I

A

Input Bias Current

Input Offset Current

●

250

20

240

1200

120

pA

V/mV

V

dB

B

OS

Large-Signal Voltage Gain

Input Voltage Range

Common Mode Rejection Ratio

Power Supply Rejection Ratio

Output Voltage Swing LOW

V = ±10V, R = 100k

60

–14.8

98

VOL

O

L

21

CMRR

PSRR

V

= –14.8V to 14V

120

–14.84

–14.73

CM

V = ±5V to ±15V

94

S

R = 1M

●

–14.67

–14.46

V

OL

L

R = 100k

L

V

Output Voltage Swing HIGH

R = 1M

R = 100k

L

●

14.76

14.58

14.88

14.79

V

mV

OH

L

I

Short-Circuit Current

Supply Current per Amplifier

●

0.6

1.3

2.4

mA

µA

SC

3.5

S

The ● denotes the specifications which apply over the temperature range of –40°C ≤ T_A≤ 85°C, V_S= ±15V, V_CM= V_O= 0V,

unless otherwise noted. (Note 3)

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

Input Offset Voltage

●

250

675

775

µV

OS

MS8 Package

I

A

Input Bias Current

Input Offset Current

●

250

20

200

1700

170

pA

V/mV

V

dB

B

OS

Large-Signal Voltage Gain

Input Voltage Range

Common Mode Rejection Ratio

Power Supply Rejection Ratio

Output Voltage Swing LOW

V = ±10V, R = 100k

50

–14.8

96

VOL

O

L

21

CMRR

PSRR

V

= –14.8V to 14V

114

120

–14.83

–14.72

CM

V = ±5V to ±15V

92

S

R = 1M

●

–14.66

–14.44

V

OL

L

R = 100k

L

V

Output Voltage Swing HIGH

R = 1M

R = 100k

L

●

14.74

14.54

14.87

14.77

V

OH

L

I

Short-Circuit Current

Supply Current per Amplifier

●

0.4

1.1

2.8

mA

µA

SC

4.2

S

–40°C to 85°C but are not tested or QA sampled at these temperatures.

The LT1672I/LT1673I/LT1674I are guaranteed to meet specified

performance from –40°C to 85°C.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: The LT1672C/LT1673C/LT1674C and LT1672I/LT1673I/LT1674I

are guaranteed functional over the Operating Temperature Range of –40°C

to 85°C.

Note 4: This parameter is not 100% tested.

Note 5: V = 5V limit guaranteed by correlation to V = 3V and V = ±15V

S

tests.

Note 3: The LT1672C/LT1673C/LT1674C are guaranteed to meet specified

performance from 0°C to 70°C. The LT1672C/LT1673C/LT1674C are

designed, characterized and expected to meet specified performance from

Note 6: V = 3V limit guaranteed by correlation to V = 5V and V = ±15V

tests.

S

5

LT1672/LT1673/LT1674

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TYPICAL PERFORMANCE CHARACTERISTICS

Distribution of Input

Supply Current vs Temperature

Minimum Supply Voltage

Offset Voltage

200

20

18

16

14

12

10

8

3.0

2.5

2.0

1.5

1.0

0.5

0

V

= 5V, 0V

S

LT1672/73/74

5600 AMPLIFIERS

150

100

T

= 25°C

= –40°C

A

V

S

= ±15V

A

V

S

= ±2.5V

T = 85°C

A

50

0

6

4

2

–50

0

3

1

2

4

5

40

80 100

–40 –20

0

20

60

–300 –200 –100

0

100 400

200 300

–400

TOTAL SUPPLY VOLTAGE (V)

INPUT OFFSET VOLTAGE (µV)

TEMPERATURE (°C)

1672/3/4 G03

1672/3/4 G02

1672/73/74 G01

Output Saturation Voltage

vs Load Current (Output Low)

Input Bias Current

vs Common Mode Voltage

Output Saturation Voltage

vs Load Current (Output High)

1000

100

10

1000

100

10

300

200

100

1.5

V

= 5V, 0V

V

= 5V, 0V

V

= 5V, 0V

S

T

= 85°C

A

= 25°C

T

= –40°C

A

T

= 85°C

A

T

= 25°C

A

T

= 85°C

A

T

= –40°C

T

= 25°C

A

T

= –40°C

A

T

= 25°C

A

0.5

T

= –40°C

T = 85°C

A

–0.5

0.1

1

10

100

1000

0.1

1

10

100

1000

–1

0

1

2

3

4

5

6

7

8

9

10

LOAD CURRENT (µA)

COMMON MODE VOLTAGE (V)

1672/3/4 G04

1672/3/4 G05

1672/3/4 G06

Gain and Phase Shift

vs Frequency

Noise Voltage Spectrum

Noise Current Spectrum

90

80

70

120

300

250

200

150

100

50

100

80

V

= ±2.5V

V

= ±2.5V

V

= ±2.5V

S

100

80

PHASE

60

50

40

30

20

10

0

60

40

60

40

20

0

20

GAIN

0

–20

–40

–60

–80

–10

100

0

1k

10k

1

10

100

1

10

100

FREQUENCY (Hz)

1672/3/4 G07

1672/3/4 G08

1672/3/4 G09

6

LT1672/LT1673/LT1674

W

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TYPICAL PERFORMANCE CHARACTERISTICS

Gain Bandwidth and Phase

Margin vs Supply Voltage

0.1Hz to 10Hz

Output Voltage Noise

Capacitive Load Handling

80

70

60

50

40

30

16

14

12

10

8

80

MEASURED AT

V

= ±2.5V

V

= ±15V

CM

S

A

V

= 5

= 0V

70

60

50

40

30

20

10

0

PHASE MARGIN

GBW

A

= 5

V

A

= 10

V

6

0

10

15

20

25

30

10

100

1k

10k

5

TIME (1s/DIV)

SUPPLY VOLTAGE (V)

CAPACITIVE LOAD (pF)

1672/3/4 G10

1672/3/4 G12

1672/3/4 G07

Common Mode Rejection Ratio

vs Frequency

Power Supply Rejection Ratio

vs Frequency

Output Impedance vs Frequency

100

90

80

70

60

50

40

30

20

10

0

100

90

80

70

60

50

40

30

20

10

0

100

10

1

V

S

= ±2.5V

V

= ±2.5V

V

= ±2.5V

S

A

V

= 10

+PSRR

A

V

= 5

–PSRR

0.1

10

100

1k

10k

100

1k

10k 20k

10

100

1k

10k

FREQUENCY (Hz)

1672/3/4 G14

1672/3/4 G13

1672/3/4 G15

Open-Loop Gain

V_S= 5V, 0V

Open-Loop Gain

Warm-Up Drift vs Time

V_S= ±15V

40

30

80

60

20

15

10

5

V

= ±15V

V

= 5V, 0V

S

20

40

20

V

= ±15V

= ±2.5V

R

= 100k

S

L

10

R

= 1M

L

R

L

= 1M

0

–20

–40

–60

0

R

= 100k

L

V

S

–10

–20

–30

– 40

–5

–10

–15

–20

–80

0

20 40 60 80 100 120 140 160 180 200

TIME AFTER POWER-UP (SEC)

1672/3/4 G16

–20 –15 –10 –5

0

5

10 15 20

1

2

4

0

5

6

3

OUTPUT VOLTAGE (V)

1672/3/4 G18

1672/3/4 G17

7

LT1672/LT1673/LT1674

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TYPICAL PERFORMANCE CHARACTERISTICS

Small-Signal Response

Large-Signal Response

1672/3/4 G19

1672/3/4 G20

1672/3/4 G21

V_S= ±15V

C_L= 100pF

A_V= 5

V_S= 5V

C_L= 100pF

A_V= 5

V_S= 5V

C

_L= 100pF

A_V= 5

W U U

U

APPLICATIO S I FOR ATIO

Start-Up Characteristics

+

V

Micropower op amps are sometimes not micropower

during start-up, wreaking havoc on low current supplies.

Intheworstcase,theremaynotbeenoughsupplycurrent

availabletotakethesystemuptonominalvoltages.Figure

1 is a graph of LT1673 supply current vs supply voltage

for the three limit cases of input offset that could occur

during start-up. The circuits are shown in Figure 2. One

circuitcreatesapositiveoffset,forcingtheoutputtocome

up saturated high. Another circuit creates a negative

offset, forcing the output to come up saturated low, while

thelastbringsuptheoutputathalfsupply.Inallcases,the

supply current is well behaved. Supply current is highest

with the output forced high, so if one amplifier is unused,

it is best to force the output low or at half supply.

5

+

–

+

–

820k

–

V

OUTPUT HIGH

V

OUTPUT LOW

V

200k

16/2/3/4 F02

OUTPUT AT V /2

S

Figure 2. Circuits for Start-Up Characteristics

Reverse Battery

TheLT1672/LT1673/LT1674areprotectedagainstreverse

battery voltages up to 18V. In the event a reverse battery

condition occurs, the supply current is typically less than

100nA (inputs grounded and outputs open). For typical

single supply applications with ground referred loads and

feedback networks, no other precautions are required. If

the reverse battery condition results in a negative voltage

at either the input pins or output pin, the current into the

pin should be limited by an external resistor to less than

10mA.

4

OUTPUT HIGH

3

OUTPUT LOW

OUTPUT V /2

2

1

0

S

Inputs

While the LT1672/LT1673/LT1674 will function normally

with its inputs taken above the positive supply, the com-

mon mode range does not extend beyond approximately

300mV below the negative supply at room temperature.

0

1

2

3

4

5

TOTAL SUPPLY VOLTAGE (V)

1672/3/4 FO1

Figure 1. Start-Up Characteristics

8

LT1672/LT1673/LT1674

W U U

APPLICATIO S I FOR ATIO

U

Thedevicewillnotbedamagediftheinputsaretakenlower

than 300mV below the negative supply as long as the cur-

rent out of the pin is limited to less than 10mA. However,

theoutputphaseisnotguaranteedandthesupplycurrent

will increase.

and (V_CC– 0.8V), Q1 and Q2 are active. When the input

common mode exceeds (V_CC– 0.8V), Q7 turns on,

diverting the current from diff amp Q1-Q2 to current

mirror Q8-Q9. The current from Q8 biases on the other

diff amp consisting of PNP’s Q5-Q6 and NPN’s Q3-Q4.

Though Q5-Q6 are driven from the emitters rather than

the base, the basic diff amp action is the same. When the

common mode voltage is between (V_CC– 0.8V) and V_CC,

devices Q3 and Q4 act as followers, forming a buffer

between the amplifier inputs and the emitters of the Q5-

Q6. If the common mode voltage is taken above V_CC,

Schottky diodes D1 and D2 reverse bias and devices Q3

and Q4 then act as diodes. The diff amp formed by Q5-Q6

operates normally, however, the input bias current in-

creases to the emitter current of Q5-Q6, which is typically

180nA. The graph, Input Bias Current vs Common Mode

Voltage found in the Typical Performance Characteristics

section, shows these transitions at three temperatures.

Output

Thegraph,CapacitiveLoadHandling,showsamplifiersta-

bility with the output biased at half supply. If the output is

to be operated within about 100mV of the positive rail, the

allowable load capacitance is less. With this output volt-

age, theworstcaseoccursatA_V=5andlightloads, where

the load capacitance should be less than 500pF with a 5V

supply and less than 100pF with a 30V supply.

Rail-to-Rail Operation

The simplified schematic, Figure 3, details the circuit

design approach of the LT1672/LT1673/LT1674. The

amplifier topology is a three-stage design consisting of a

rail-to-rail input stage, that continues to operate with the

inputs above the positive rail, a folded cascode second

stage that develops most of the voltage gain, and a rail-to-

rail common emitter stage that provides the current gain.

Thecollectorcurrentsofthetwo-inputpairsarecombined

in the second stage consisting of Q11 to Q16, which

furnishes most of the voltage gain. Capacitor C1 sets the

amplifier bandwidth. The output stage is configured for

maximum swing by the use of common emitter output

devices Q21 and Q22. Diodes D4 to D6 and current source

Q15 set the output quiescent current.

TheinputstageisformedbytwodiffampsQ1-Q2andQ3-

Q6.ForsignalswithacommonmodevoltagebetweenV_EE

D1

D2

D3

D7

Q10

Q13

Q14

Q15

Q20

Q19

+

I

1

Q21

C1

+

–

IN

OUT

+

Q1 Q2

Q3

Q4

Q7

(V ) – 0.8V

Q16

Q17

D4

D5

D6

Q11

Q12

Q5

Q6

Q18

Q22

R1

R2

I

2

Q9

Q8

1672/3/4 F03

Figure 3. Simplified Schematic

9

LT1672/LT1673/LT1674

U

TYPICAL APPLICATIO S

Battery Current Monitor

Over-the-Top Comparator with Hysteresis

I

L

R

SENSE

CHARGE

1M

0.1Ω

5V (V

)

CC

12V

DISCHARGE

5V

10k

IN1

R

A

+

–

+

(0V TO 12V)

–

A2

V

LT1672

1M

A1

1/2 LT1673

OUT

1/2 LT1673

R

A

1M

+

1M

2N5087

10k

IN2

(0V TO 12V)

2N3904

DISCHARGE

2N3904

CHARGE

R

B

A

V

= I

R

SENSE

O

L

(

)

2N5210

OUT

V

CC

100

HYSTERESIS =

FOR R = 10k, R = 100k (R /R ≥5)

R

A

B

A

B

1672/3/4 TA03

V

I

S

< 10µA

O

L

= 1V/A

1672/3/4 TA04

U

PACKAGE DESCRIPTIO

Dimensions in inches (millimeters) unless otherwise noted.

MS8 Package

8-Lead Plastic MSOP

(LTC DWG # 05-08-1660)

0.118 ± 0.004*

0.043

(1.10)

MAX

0.034

(0.86)

REF

(3.00 ± 0.102)

8

7

6

5

0.007

(0.18)

0° – 6° TYP

0.118 ± 0.004**

(3.00 ± 0.102)

0.193 ± 0.006

(4.90 ± 0.15)

SEATING

PLANE

0.009 – 0.015

(0.22 – 0.38)

0.021 ± 0.006

(0.53 ± 0.015)

0.005 ± 0.002

(0.13 ± 0.05)

0.0256

(0.65)

BSC

MSOP (MS8) 1100

1

2

3

4

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

PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

N8 Package

8-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

0.400*

(10.160)

MAX

0.130 ± 0.005

0.300 – 0.325

0.045 – 0.065

(3.302 ± 0.127)

(1.143 – 1.651)

(7.620 – 8.255)

8

7

6

5

4

0.065

(1.651)

TYP

0.255 ± 0.015*

(6.477 ± 0.381)

0.009 – 0.015

(0.229 – 0.381)

0.125

0.020

(0.508)

MIN

(3.175)

MIN

+0.035

–0.015

1

2

3

0.325

0.018 ± 0.003

0.100

(2.54)

BSC

+0.889

8.255

(0.457 ± 0.076)

(

)

N8 1098

–0.381

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

10

LT1672/LT1673/LT1674

U

PACKAGE DESCRIPTIO

Dimensions in inches (millimeters) unless otherwise noted.

S8 Package

8-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.189 – 0.197*

(4.801 – 5.004)

7

5

8

6

0.150 – 0.157**

(3.810 – 3.988)

0.228 – 0.244

(5.791 – 6.197)

1

3

4

2

0.010 – 0.020

(0.254 – 0.508)

× 45°

0.053 – 0.069

(1.346 – 1.752)

0.004 – 0.010

(0.101 – 0.254)

0.008 – 0.010

(0.203 – 0.254)

0°– 8° TYP

0.016 – 0.050

(0.406 – 1.270)

0.050

(1.270)

BSC

0.014 – 0.019

(0.355 – 0.483)

TYP

*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

SO8 1298

S Package

14-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.337 – 0.344*

(8.560 – 8.738)

13

12

11

10

8

14

9

0.228 – 0.244

(5.791 – 6.197)

0.150 – 0.157**

(3.810 – 3.988)

1

2

3

4

5

6

7

0.010 – 0.020

(0.254 – 0.508)

× 45°

0.053 – 0.069

(1.346 – 1.752)

0.004 – 0.010

(0.101 – 0.254)

0.008 – 0.010

(0.203 – 0.254)

0° – 8° TYP

0.050

(1.270)

BSC

0.014 – 0.019

(0.355 – 0.483)

TYP

0.016 – 0.050

(0.406 – 1.270)

S14 1298

*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

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 represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

11

LT1672/LT1673/LT1674

U

TYPICAL APPLICATIO

Micropower Photodiode Amplifier

C1

20pF

R1

10M

V

OUT

PHOTODIODE

GAIN: A = 10MΩ =

Z

I

10% TO 90% RISE TIME: t = 260µs

r

+

V

S

BANDWIDTH: BW = 1.7kHz

I

PHOTODIODE

–

+

880nm IR

PHOTODIODE

V

LT1672

–

OUT

C

D

λ

170pF

OPTO-DIODE CORP

ODD-45W

V

= ±1.2V TO ±15V

S

V

S

C1, CD SATISFY GAIN OF 5

STABILITY REQUIREMENT AT AC.

1672/3/4 TA05

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

LTC^®1440/41/42

Micropower Single/Dual Comparators with 1% Reference LTC1440: Single, LTC1441/42: Dual

LTC1443/LTC1444/LTC1445 Micropower Quad Comparators with 1% Reference

LTC1443: 1.182 Reference

LTC1444/45: 1.221V Reference and Adjustable Hysteresis

LT1466/LT1467

75µA Dual/Quad Rail-to-Rail Input and Output Op Amps

50µA Dual/Quad Rail-to-Rail Input and Output Op Amps

390µV V

950µV V

, Gain Bandwidth = 120kHz

, Gain Bandwidth = 200kHz

OS(MAX)

LT1490A/LT1491A

LT1494/LT1495/LT1496

OS(MAX)

1.5µA Max Single/Dual/Quad Over-the-Top

Unity Gain Stable Version of the LT1672/LT1673/LT1674

Precision Rail-to-Rail Input and Output Op Amps

LTC1540

LT1636

Nanopower Single Comparator with 1% Reference

350nA Supply Current

Single Over-the-Top Micropower, Rail-to-Rail

Input and Output Op Amp

225µV V , I = 55µA (Max), Gain Bandwidth = 200kHz,

OS(MAX) S

Shutdown Pin, MSOP

LT2078/LT2079

LT2178/LT2179

LT1782

55µA Dual/Quad Single Supply Op Amps

17µA Dual/Quad Single Supply Op Amps

120µV V

, Gain Bandwidth = 200kHz

, Gain Bandwidth = 60kHz

OS(MAX)

Micropower, Over-The-Top, SOT-23, Rail-to-Rail

Input and Output Op Amp

SOT-23, 800µV V

Gain-Bandwidth = 200kHz, Shutdown Pin

, I = 55µA (Max),

OS(MAX) S

LT1783

1.2MHz, Over-The-Top, Micropower, Rail-to-Rail

Input and Output Op Amp in SOT-23

SOT-23, 800µV V , I = 300µA (Max),

Gain-Bandwidth = 1.2MHz, Shutdown Pin

OS(MAX)

S

167234f LT/TP 0101 4K • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

12

●

LINEAR TECHNOLOGY CORPORATION 2001

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


型号：	LT1673CS8#TRPBF
厂家：	Linear
描述：	LT1673 - 2uA Max, AV >=5 Dual Over-The-Top Precision Rail-to-Rail Input and Output Op Amps; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 放大器光电二极管
文件：	总12页 (文件大小：211K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT1673CS8#TRPBF [Linear]

相关型号：

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LT1673IS8#TRPBF

LT1673_15

LT1674

LT1674

LT1674CN

LT1674CN#PBF

LT1674CS

LT1674CS#PBF

LT1674CS#TRPBF