LT1495CS8#PBF_技术文档

LT1495/LT1496

1.5µA Max, Dual and Quad

Precision Rail-to-Rail

Input and Output Op Amps

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FEATURES

DESCRIPTION

TheLT^®1495/LT1496arethelowestpower(I_S≤ 1.5µA)op

amps with precision specifications. The extremely low

supply current is combined with excellent amplifier speci-

fications: input offset voltage is 375µV maximum with a

typical drift of only 0.4µV/°C, input offset current is 100pA

maximum.Aminimumopen-loopgain(A_VOL)of100V/mV

ensures that gain errors are small. The device character-

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

Supply rejection is 90dB and the common mode rejection

ratio is 90dB. Operation is specified for 3V, 5V and ±15V

supplies. Reverse battery protection (–18V min) and

inputs that operate above the positive supply make the

LT1495/LT1496 easy to use in harsh environments.

■

Low Supply Current: 1.5µA Max

Rail-to-Rail Input and Output

■

Low Offset Voltage: 375µV Max

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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APPLICATIONS

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.

■

Battery- or Solar-Powered Systems

■

Portable Instrumentation

■

Remote Sensor Amplifier

Micropower Filter

■

The LT1495 is available in plastic 8-pin PDIP and SO-8

packages with the standard dual op amp pinout. The

LT1496 is available in 14-pin SO and PDIP packages.

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

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TYPICAL APPLICATION

TC V_OSDistribution

Micropower Integrating Current Sense

30

RESET

100 AMPLIFIERS

V

= ±2.5V

S

25

20

15

10

5

0.1µF

–40°C TO 85°C

V

CC

R

I

1M

–

R

S

–

1/2 LT1495

0.1Ω

1M

1/2 LT1495

V

O

+

I

L

+

10M

LOAD

1495 TA01

V

CC

0

200k

–2.0 –1.6 –1.2 –0.8 –0.4

0

0.4 0.8 1.2 1.6 2.0

TC V (µV/°C)

OS

1495 TA02

OUTPUT SWITCHES

WHEN I dt = 0.98 V

L

R

I

C = (4.9A)(SEC) FOR V = 5V

CC

(

)

S

I

= 3µA DURING INTEGRATION; I = 5µA END OF INTEGRATION

S

1

LT1495/LT1496

W W

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ABSOLUTE MAXIMUM RATINGS

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

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

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

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

Operating Temperature Range ................ –40°C to 85°C

Specified Temperature Range (Note 1) ... –40°C to 85°C

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

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

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

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PACKAGE/ORDER INFORMATION

ORDER PART

TOP VIEW

NUMBER

TOP VIEW

1

2

3

4

5

6

7

OUT D

–IN D

+IN D

14

13

12

11

10

9

OUT A

–IN A

+IN A

+

LT1495CN8

LT1495CS8

LT1496CN

LT1496CS

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 C

–IN C

OUT C

+IN B

–IN B

–

V

S8 PART MARKING

1495

N8 PACKAGE

8-LEAD PDIP

S8 PACKAGE

8-LEAD PLASTIC SO

8

OUT B

S PACKAGE

14-LEAD PLASTIC SO

N PACKAGE

14-LEAD PDIP

T_JMAX= 150°C, θ_JA= 130°C/ W (N8)

_JMAX= 150°C, θ_JA= 190°C/ W (S8)

T

T_JMAX= 150°C, θ_JA= 110°C/ W (N8)

_JMAX= 150°C, θ_JA= 150°C/ W (S8)

T

Consult factory for Industrial and Military grade parts.

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

V = 3V

S

MIN

TYP

MAX

UNITS

V

Input Offset Voltage

150

200

375

475

µV

OS

S

I

Input Bias Current

(Note 3)

250

180

20

4

185

10

500

250

1000

360

100

pA

nA

pA

B

V

= 10V (Note 4)

CM

Input Offset Current

Input Noise Voltage

Input Noise Voltage Density

Input Noise Current Density

Large-Signal Voltage Gain

(Note 3)

OS

0.1Hz to 10Hz

f = 100Hz

µV

P-P

nV/√Hz

fA/√Hz

V/mV

e

n

i

n

A

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

100

50

VOL

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

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

No Load

OL

I

= 100µA

210

SINK

2

LT1495/LT1496

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

MIN

V – 0.07

V – 0.32

TYP

V – 0.035

V – 0.160

MAX

UNITS

+

V

OH

Output Voltage Swing HIGH

No Load

V

+

I

= 100µA

SOURCE

I

Short-Circuit Current

Supply Current per Amplifier

Reverse Supply Voltage

Slew Rate

(Note 3)

(Note 4)

0.7

1.3

1.0

mA

µA

V

V/ms

kHz

SC

1.5

S

I = 10µA per Amplifier

–18

0.4

S

SR

GBW

A = –1, V = ±5V

1.0

2.7

V

S

Gain Bandwidth Product

f = 100Hz

0°C ≤ T_A≤ 70°C, V_S= 5V, 0V; V_S= 3V, 0V; V_CM= V_O= half supply, unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

V = 5V

V = 3V

S

MIN

TYP

175

225

MAX

425

525

UNITS

V

OS

Input Offset Voltage

●

µV

S

V

TC

Input Offset Voltage Drift

Input Bias Current

(Note 2)

(Note 3)

●

0.4

250

240

20

280

150

2

µV/°C

OS

I

●

1200

500

120

pA

nA

pA

V/mV

B

V

CM

= 10V (Note 4)

Input Offset Current

Large-Signal Voltage Gain

(Note 3)

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

●

OS

A

VOL

●

75

40

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

= 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

OL

V

OH

No Load

●

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 3)

(Note 4)

●

0.6

1.1

1.2

mA

µA

SC

1.8

S

–40°C ≤ T_A≤ 85°C, V_S= 5V, 0V; V_S= 3V, 0V; V_CM= V_O= half supply, unless otherwise noted. (Note 1)

SYMBOL PARAMETER

CONDITIONS

V = 5V

V = 3V

S

MIN

TYP

MAX

UNITS

V

OS

Input Offset Voltage

●

200

250

475

575

µV

S

V

TC

Input Offset Voltage Drift

Input Bias Current

(Note 2)

(Note 3)

●

0.4

250

275

20

215

115

2

µV/°C

OS

I

●

1700

pA

nA

pA

V/mV

B

V

CM

= 10V (Note 4)

Input Offset Current

Large-Signal Voltage Gain

(Note 3)

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

●

170

36

OS

A

VOL

●

55

30

0

S

O

L

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

S

O

L

Input Voltage Range

●

V

CMRR

PSRR

Common Mode Rejection Ratio

V

= 0.2V to 4V, V = 5V

●

88

106

75

99

dB

V

CM

S

= 0.2V to 10V, V = 5V

S

Power Supply Rejection Ratio

Minimum Operating Supply Voltage

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

S

●

88

CM

O

2.6

2.7

3

LT1495/LT1496

ELECTRICAL CHARACTERISTICS

–40°C ≤ T_A≤ 85°C, V_S= 5V, 0V; V_S= 3V, 0V; V_CM= V_O= half supply, unless otherwise noted. (Note 1)

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

Output Voltage Swing LOW

No Load

●

60

245

V – 0.05

V – 0.19

120

490

mV

OL

OH

I

= 100µA

SINK

+

V

Output Voltage Swing HIGH

No Load

= 100µA

●

V – 0.10

+

I

V – 0.38

SOURCE

I

Short-Circuit Current

Supply Current per Amplifier

(Note 3)

(Note 4)

●

0.4

0.9

1.5

mA

µA

SC

2.3

S

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

SYMBOL PARAMETER CONDITIONS

MIN

TYP

200

25

MAX

575

1000

100

UNITS

µV

V

OS

Input Offset Voltage

I

Input Bias Current

Input Offset Current

pA

B

20

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

CM

= –15V to 14V

120

–14.85

–14.75

V = ±5V to ±15V

S

V

OL

R = 1M

–14.70

–14.50

L

R = 100k

L

V

OH

Output Voltage Swing HIGH

R = 1M

R = 100k

L

14.78

14.62

14.89

14.81

V

L

I

Short-Circuit Current

Supply Current per Amplifier

0.7

1.5

1.4

mA

µA

SC

2.0

S

0°C ≤ T_A≤ 70°C, V_S= ±15V, V_CM= V_O= 0V, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS

MIN

TYP

225

250

20

MAX

625

1200

120

UNITS

µV

V

OS

Input Offset Voltage

●

I

Input Bias Current

Input Offset Current

pA

V/mV

V

dB

V

B

OS

A

VOL

Large-Signal Voltage Gain

Input Voltage Range

V = ±10V, R = 100k

60

–15

98

240

O

L

21

CMRR

PSRR

Common Mode Rejection Ratio

Power Supply Rejection Ratio

Output Voltage Swing LOW

V

= –14.8V to 14V

120

–14.84

–14.73

CM

V = ±5V to ±15V

94

S

V

OL

R = 1M

●

–14.67

–14.46

L

R = 100k

L

V

OH

Output Voltage Swing HIGH

R = 1M

R = 100k

L

●

14.76

14.58

14.88

14.79

V

mV

L

I

Short-Circuit Current

Supply Current per Amplifier

●

0.6

1.3

1.6

mA

µA

SC

2.4

S

4

LT1495/LT1496

ELECTRICAL CHARACTERISTICS

–40°C ≤ T_A≤ 85°C, V_S= ±15V, V_CM= V_O= 0V, unless otherwise noted. (Note 1)

SYMBOL PARAMETER CONDITIONS

MIN

TYP

250

20

MAX

675

1700

170

UNITS

µV

V

OS

Input Offset Voltage

●

I

Input Bias Current

Input Offset Current

pA

V/mV

V

dB

V

B

OS

A

VOL

Large-Signal Voltage Gain

Input Voltage Range

V = ±10V, R = 100k

O

50

–15

96

200

L

21

CMRR

PSRR

Common Mode Rejection Ratio

Power Supply Rejection Ratio

Output Voltage Swing LOW

V

= –14.8V to 14V

114

120

–14.83

–14.72

CM

V = ±5V to ±15V

92

S

V

OL

R = 1M

●

–14.66

–14.44

L

R = 100k

L

V

OH

Output Voltage Swing HIGH

R = 1M

R = 100k

L

●

14.74

14.54

14.87

14.77

V

L

I

Short-Circuit Current

Supply Current per Amplifier

●

0.4

1.1

2.0

mA

µA

SC

3.0

S

Note 2: This parameter is not 100% tested.

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

The

● denotes specifications which apply over the full operating

temperature range.

S

tests.

Note 1: The LT1495/LT1496 are designed, characterized and expected to

meet these extended temperature limits, but are not tested at –40°C and

85°C. Guaranteed I grade parts are available; consult factory.

Note 4: V = 3V limit guaranteed by correlation to V = 5V and V = ±15V

tests.

S

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TYPICAL PERFORMANCE CHARACTERISTICS

Distribution of Input Offset Voltage

Supply Current vs Temperature

Minimum Supply Voltage

20

18

16

14

12

10

8

2.5

2.0

1.5

1.0

0.5

0

200

V

S

= 5V, 0V

LT1495/LT1496

4500 OP AMPS

150

100

T

= 25°C

A

T

A

= –40°C

T

= 85°C

V

S

= ±15V

A

50

0

V

= ±2.5V

S

6

4

2

0

–50

–400

0

200 300

400

–40 –20

0

20

40

60

80 100

1

2

3

4

5

–300 –200 –100

100

INPUT OFFSET VOLTAGE (µV)

TEMPERATURE (°C)

TOTAL SUPPLY VOLTAGE (V)

1495 G01

1495 G02

1495 G03

5

LT1495/LT1496

TYPICAL PERFORMANCE CHARACTERISTICS

W

U

Input Bias Current

vs Common Mode Voltage

Output Saturation Voltage

vs Load Current (Output Low)

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

S

V

= 5V, 0V

S

T

= 85°C

= 25°C

A

T

= –40°C

A

T

A

= 85°C

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

A

= –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)

1495 G04

1495 G05

1495 G06

Gain and Phase Shift

vs Frequency

Noise Voltage Spectrum

Noise Current Spectrum

50

40

120

300

250

200

150

100

50

100

80

V

S

= ±2.5V

V

= ±2.5V

V

S

= ±2.5V

S

100

80

30

PHASE

20

60

40

20

0

10

40

GAIN

0

20

–10

–20

–30

0

–20

–40

0

0.1

1

10

1

10

100

1

10

100

FREQUENCY (kHz)

FREQUENCY (Hz)

1495 G09

1495 G08

1495 G10

Gain Bandwidth and Phase

Margin vs Supply Voltage

0.1Hz to 10Hz

Output Voltage Noise

Capacitive Load Handling

80

70

60

50

40

30

20

10

0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

70

60

50

40

30

20

10

0

V

= ±2.5V

V

= ±15V

CM

S

PHASE MARGIN

GBW

= 0V

A

= 1

V

A

V

= 5

A

= 10

V

20

SUPPLY VOLTAGE (V)

30

10

100

1000

10000

100000

0

5

10

15

25

TIME (1s/DIV)

CAPACITIVE LOAD (pF)

1495 G12

1495 G11

1495 G07

6

LT1495/LT1496

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TYPICAL PERFORMANCE CHARACTERISTICS

Common Mode Rejection Ratio

vs Frequency

Power Supply Rejection Ratio

vs Frequency

Output Impedance vs Frequency

100

90

100

90

1000

100

V

= ±2.5V

V

= ±2.5V

S

POSITIVE

SUPPLY

80

70

60

50

60

50

A

= 10

V

10

1

NEGATIVE

SUPPLY

40

30

20

10

0

40

30

20

10

0

A

V

= 1

0.1

0.01

0.1

1

10

0.01

0.1

1

10

0.1

1

10

FREQUENCY (kHz)

1495 G14

1495 G13

1495 G15

Open-Loop Gain

V_S= 5V, 0V

Open-Loop Gain

V_S= ±15V

Warm-Up Drift vs Time

40

30

20

15

10

5

80

60

V

S

= 5V, 0V

V = ±15V

S

20

40

20

R

= 100k

V

= ±15V

= ±2.5V

L

S

10

R

= 1M

L

R

= 1M

L

0

–20

–40

–60

R

L

= 100k

V

S

–10

–20

–30

– 40

–5

–10

–15

–20

–80

1

2

4

–20 –15 –10 –5

0

5

10 15 20

0

5

6

0

20 40 60 80 100 120 140 160 180 200

TIME AFTER POWER-UP (SEC)

1495 G16

3

OUTPUT VOLTAGE (V)

1495 G17

1495 G18

Small-Signal Response

V_S= 5V, 0V

Large-Signal Response

V_S= 5V, 0V

Small-Signal Response

V_S= ±15V

1495 G20

1495 G19

1495 G21

V_S= 5V, 0V

V_S= ±15V

V_S= 5V, 0V

R

_L= 1M

R

_L= 1M

R_L= 1M

C_L= 100pF

7

LT1495/LT1496

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APPLICATIONS INFORMATION

Start-Up Characteristics

Reverse Battery

TheLT1495/LT1496areprotectedagainstreversebattery

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

tionoccurs,thesupplycurrentistypicallylessthan100nA

(inputsgroundedandoutputsopen).Fortypicalsinglesup-

ply applications with ground referred loads and feedback

networks,nootherprecautionsarerequired.Ifthereverse

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.

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 LT1495 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.

Inputs

While the LT1495/LT1496 will function normally with its

inputstakenabovethepositivesupply,thecommonmode

range does not extend beyond approximately 300mV be-

low the negative supply at room temperature. The device

will not be damaged if the inputs are taken lower than

300mV below the negative supply as long as the current

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

outputphaseisnotguaranteedandthesupplycurrentwill

increase.

5

4

OUTPUT HIGH

3

2

Output

OUTPUT LOW

1

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=1andlightloads, where

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

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

OUTPUT V /2

S

0

1

2

3

4

5

SUPPLY VOLTAGE (V)

1495 F01

Figure 1. Start-Up Characteristics

V

S

Rail-to-Rail Operation

The simplified schematic, Figure 3, details the circuit

design approach of the LT1495/LT1496. 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 com-

mon emitter stage that provides the current gain.

V /2

+

–

+

–

+

S

–

1495 F02

OUTPUT HIGH

OUTPUT LOW

OUTPUT AT V /2

S

Figure 2. Circuits for Start-Up Characteristics

8

LT1495/LT1496

U

W U U

APPLICATIONS INFORMATION

D1

D2

D3

D7

Q10

Q13

Q14

Q15

Q20

+

I

1

Q21

OUT

C1

+

–

IN

+

Q1 Q2

Q3

Q4

Q7

(V ) – 0.8V

Q16

Q17

Q19

D4

D5

D6

Q11

Q5

0.5

Q6

0.5

Q12

0.5

Q18

Q22

+

R1

R2

I

2

Q9

Q8

1495 F03

Figure 3. Simplified Schematic

TheinputstageisformedbytwodiffampsQ1-Q2andQ3-

Q6.ForsignalswithacommonmodevoltagebetweenV_EE

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

mirrorQ8-Q9.ThecurrentfromQ8biasesontheotherdiff

ampconsistingofPNP’sQ5-Q6andNPN’sQ3-Q4.Though

Q5-Q6 are driven from the emitters rather than the base,

the basic diff amp action is the same. When the common

modevoltageisbetween(V_CC–0.8V)andV_CC,devicesQ3

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

diodesD1andD2reversebiasanddevicesQ3andQ4then

act as diodes. The diff amp formed by Q5-Q6 operates

normally, however, the input bias current increases 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.

The collector currents of the two-input pairs are combined

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.

9

LT1495/LT1496

TYPICAL APPLICATIONS N

U

13µA, 0kHz to 10kHz Voltage to Frequency Converter

270k

10M*

3.9M*

20M

5V

–

+

390Ω

1/2

LT1495

3.9M

+

100k

562k*

5V

1µF

V

IN

–

0V TO 2.5V

LTC^®1440

0.0082µF

+

1.2

REFERENCE

LTC1440

12pF

1N5712

1N4148

3.6M TYP

SELECT FOR 100Hz

360k

Q1: ZTX-849

AT V = 0.025V

IN

*1% METAL FILM

†

POLYSTYRENE

39k

10M

0V – 2.5V = 0kHz – 10kHz

†

0.05µF

100pF

OUTPUT

0kHz TO 10kHz

SUPPLY CURRENT = 6.2µA QUIESCENT

= 13.µ3A AT f = 10kHz

15k

–

Q1

LINEARITY: ±0.03%

1/2

LT1495

PSRR (4.4V TO 36V): 10ppm/V

TEMPERATURE DRIFT: 250ppm/°C

+

1495 TA07

6µA, A_V= 1000, Chopper Stabilized Amplifier

0.2µF

1µF

5V

φ1

φ2

1µF

+

φ2

1M

1/2

LT1495

INPUT

–

1M

1/2

LT1495

OUTPUT

–

10M

10k

+

–5V

φ1

10M

10k

10M

φ1

–

5V

GAIN: 1000

–

1/2

LTC1441

OFFSET: 1µV

0.047µF

DRIFT: 50nV/°C

+

1/2

LTC1441

φ2

SUPPLY CURRENT: 5.5µA

BANDWIDTH: 0.2Hz

CLOCK RATE: 4Hz

10M

+

–5V

1495 TA08

CD4016 QUAD

10

LT1495/LT1496

U

PACKAGE DESCRIPTION

Dimensions in inches (millimeters) unless otherwise noted.

N8 Package

8-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

0.400*

(10.160)

MAX

0.130 ± 0.005

(3.302 ± 0.127)

0.300 – 0.325

(7.620 – 8.255)

0.045 – 0.065

(1.143 – 1.651)

8

1

7

6

5

0.065

(1.651)

TYP

0.255 ± 0.015*

(6.477 ± 0.381)

0.009 – 0.015

(0.229 – 0.381)

+0.025

0.125

0.005

(0.127)

MIN

0.015

(0.380)

MIN

(3.175)

MIN

0.325

2

4

3

–0.015

+0.635

8.255

N8 0695

0.100 ± 0.010

(2.540 ± 0.254)

0.018 ± 0.003

(0.457 ± 0.076)

(

)

–0.381

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

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

S8 Package

8-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.189 – 0.197*

(4.801 – 5.004)

0.010 – 0.020

(0.254 – 0.508)

7

5

8

6

× 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

0.150 – 0.157**

(3.810 – 3.988)

0.228 – 0.244

(5.791 – 6.197)

0.016 – 0.050

0.406 – 1.270

0.050

(1.270)

BSC

0.014 – 0.019

(0.355 – 0.483)

*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

SO8 0695

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD

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

1

2

3

4

N Package

14-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

0.770*

(19.558)

MAX

0.300 – 0.325

(7.620 – 8.255)

0.045 – 0.065

0.130 ± 0.005

(3.302 ± 0.127)

(1.143 – 1.651)

14

13

12

11

10

9

8

7

0.015

(0.380)

MIN

0.255 ± 0.015*

(6.477 ± 0.381)

0.065

(1.651)

TYP

0.009 – 0.015

(0.229 – 0.381)

0.125

(3.175)

MIN

+0.025

1

2

3

5

6

4

0.325

0.005

(0.125)

MIN

–0.015

0.018 ± 0.003

N14 0695

+0.635

8.255

(0.457 ± 0.076)

(

)

–0.381

0.100 ± 0.010

(2.540 ± 0.254)

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

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

S Package

14-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.337 – 0.344*

(8.560 – 8.738)

0.010 – 0.020

(0.254 – 0.508)

14

13

12

11

10

9

8

× 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

0.228 – 0.244

0.150 – 0.157**

(5.791 – 6.197)

0.050

(1.270)

TYP

(3.810 – 3.988)

0.014 – 0.019

(0.355 – 0.483)

0.016 – 0.050

0.406 – 1.270

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

*

**

1

2

3

4

5

6

7

S14 0695

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

LT1495/LT1496

U

TYPICAL APPLICATIONS N

0nA to 200nA Current Meter

Battery Current Monitor

I

100pF

L

R

SENSE

0.1Ω

CHARGE

R1

10M

12V

DISCHARGE

5V

R

A

R4

–

+

–

10k

1/2

LT1495

1.5V

A2

A1

–

1/2 LT1495

+

R

A

1/2

LT1495

INPUT

A

+

CURRENT

R2

9k

+

1.5V

R3

2N3904

DISCHARGE

2N3904

I

= 3µA WHEN I = 0

IN

S

2k

R

B

A

NO ON/OFF SWITCH

REQUIRED

CHARGE

OUT

FULL-SCALE

ADJUST

V

= I

R

SENSE

O

L

(

)

OUT

FOR R = 1k, R = 10k

R

B

R

A

B

0µA TO

200µA

µA

V

O

L

= 1V/A

1495 TA06

I

1495 TA05

6th Order 10Hz Elliptic Lowpass Filter

Filter Frequency Response

0

–10

–20

–30

–40

–50

–60

10k

100k

15nF

215k

15nF

100nF

e

+

in

215k

1/2 LT1495

215k

100nF

100k

30nF

–

200k

10nF

V

S

= 5V, 0V

I

= 2µA + e /150k

S

in

ZEROS AT 50Hz AND 60Hz

10k

1

10

100

1000

80.6k

FREQUENCY (Hz)

15nF

169k

15nF

100nF

LT1495/96 • TA04

+

169k

30nF

OUTPUT

1/2 LT1495

169k

100nF

100k

–

200k

10nF

1495 TA03

RELATED PARTS

PART NUMBER

LTC1440/41/42

LTC1443/44/45

DESCRIPTION

COMMENTS

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

Micropower Quad Comparators with 1% Reference

LTC1443: 1.182 Reference

LTC1444/45: 1.221V Reference and Adjustable Hysteresis

LT1466/LT1467

LT1490/LT1491

LTC1540

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

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

Nanopower Single Comparator with 1% Reference

55µA Dual/Quad Single Supply Op Amps

390µV V

950µV V

, Gain Bandwidth = 120kHz

, Gain Bandwidth = 200kHz

OS(MAX)

350nA Supply Current

LT2078/LT2079

LT2178/LT2179

120µV V

, Gain Bandwidth = 200kHz

, Gain Bandwidth = 60kHz

OS(MAX)

17µA Dual/Quad Single Supply Op Amps

OS(MAX)

14956f LT/TP 0697 5K • PRINTED IN USA

Linear Technology Corporation

●

1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900

12

●

FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com

LINEAR TECHNOLOGY CORPORATION 1997


型号：	LT1495CS8#PBF
厂家：	Linear
描述：	LT1495 - 1.5uA Max, Single, Dual and Quad Precision Rail-to-Rail Input and Output Op Amps; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 运算放大器
文件：	总12页 (文件大小：317K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT1495CS8#PBF [Linear]

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