LT1128CS8_技术文档

LT1028/LT1128

Ultra Low Noise Precision

High Speed Op Amps

U

DESCRIPTIO

EATURE

Voltage Noise

S

F

■

The LT1028(gain of –1 stable)/LT1128(gain of +1 stable)

achieveanewstandardofexcellenceinnoiseperformance

with 0.85nV/√Hz 1kHz noise, 1.0nV/√Hz 10Hz noise. This

ultra low noise is combined with excellent high speed

specifications (gain-bandwidth product is 75MHz for

LT1028, 20MHz for LT1128), distortion-free output, and

true precision parameters (0.1µV/°C drift, 10µV offset

voltage, 30 million voltage gain). Although the LT1028/

LT1128 input stage operates at nearly 1mA of collector

current to achieve low voltage noise, input bias current is

only 25nA.

1.1nV/√Hz Max. at 1kHz

0.85nV/√Hz Typ. at 1kHz

1.0nV/√Hz Typ. at 10Hz

35nV_P-PTyp., 0.1Hz to 10Hz

Voltage and Current Noise 100% Tested

Gain-Bandwidth Product

LT1028: 50MHz Min.

■

LT1128: 13MHz Min.

■

Slew Rate

LT1028: 11V/µs Min.

LT1128: 5V/µs Min.

The LT1028/LT1128’s voltage noise is less than the noise

of a 50Ω resistor. Therefore, even in very low source

impedance transducer or audio amplifier applications, the

LT1028/LT1128’s contribution to total system noise will

be negligible.

■

Offset Voltage: 40µV Max.

Drift with Temperature: 0.8µV/°C Max.

Voltage Gain: 7 Million Min.

Available in 8-Pin SO Package

O U

PPLICATI

S

A

■

Low Noise Frequency Synthesizers

High Quality Audio

Infrared Detectors

Accelerometer and Gyro Amplifiers

350Ω Bridge Signal Conditioning

Magnetic Search Coil Amplifiers

Hydrophone Amplfiers

Flux Gate Amplifier

Voltage Noise vs Frequency

10

V

T

= ±15V

= 25°C

S

A

DEMODULATOR

SYNC

MAXIMUM

+

1/f CORNER = 14Hz

OUTPUT TO

DEMODULATOR

LT1028

TYPICAL

–

1k

1

SQUARE

WAVE

DRIVE

1kHz

FLUX GATE

TYPICAL

SCHONSTEDT

#203132

1/f CORNER = 3.5Hz

50Ω

0.1

1

10

1k

100

1028/1128 TA01

FREQUENCY (Hz)

1028/1128 TA02

1

LT1028/LT1128

W W W

U

ABSOLUTE AXI U RATI GS

Operating Temperature Range

Supply Voltage

LT1028/LT1128AM, M ..................... –55°C to 125°C

LT1028/LT1128AC, C ......................... –40°C to 85°C

Storage Temperature Range

–55°C to 105°C ................................................ ±22V

105°C to 125°C ................................................ ±16V

Differential Input Current (Note 8) ...................... ±25mA

Input Voltage ............................ Equal to Supply Voltage

Output Short Circuit Duration .......................... Indefinite

All Devices ........................................ –65°C to 150°C

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

W

U

/O

PACKAGE RDER I FOR ATIO

TOP VIEW

ORDER PART

V

OS

TRIM

NUMBER

TOP VIEW

8

V

OS

V

TRIM

V+

+

OS

1

2

3

4

8

7

6

5

1

3

V

TRIM

7

5

TRIM

OS

–IN

+IN

LT1028CS8

LT1128CS8

–

+

–

–IN

LT1028AMH

LT1028MH

LT1028ACH

LT1028CH

6

2

OUT

+

+IN

OUT

OVER-

COMP

–

OVER-

COMP

V

4

V

S8 PART MARKING

–

S8 PACKAGE

8-LEAD PLASTIC SOIC

(CASE)

1028

1128

H PACKAGE

8-LEAD TO-5 METAL CAN

TOP VIEW

ORDER PART

NUMBER

LT1028AMJ8

LT1028MJ8

LT1028ACJ8

LT1028CJ8

LT1028ACN8

LT1028CN8

LT1128AMJ8

LT1128MJ8

LT1128CJ8

LT1128ACN8

LT1128CN8

NC

1

16

15

14

13

12

11

10

9

NC

TOP VIEW

2

3

4

5

6

7

8

NC

V

TRIM

V+

OS

1

2

3

4

8

7

6

5

TRIM

–IN

TRIM

LT1028CS16

–

+

–IN

+

–

+

V

OUT

+IN

OUT

OVER-

COMP

NC

OVER-

COMP

–

V

NC

J8 PACKAGE

8-LEAD CERAMIC DIP

N8 PACKAGE

8-LEAD PLASTIC DIP

S PACKAGE

16-LEAD PLASTIC SOL

NOTE: THIS DEVICE IS NOT RECOM-

MENDED FOR NEW DESIGNS

ELECTRICAL CHARACTERISTICS ^V_S^{= ±15V, T}_A^{= 25°C, unless otherwise noted.}

LT1028M/C

LT1128M/C

LT1028AM/AC

LT1128AM/AC

SYMBOL PARAMETER

CONDITIONS

(Note 1)

MIN

TYP

MAX

MIN

TYP

20

MAX

80

UNITS

µV

V

Input Offset Voltage

10

40

OS

∆V

∆Time

Long Term Input Offset

Voltage Stability

(Note 2)

0.3

µV/Mo

OS

I

e

Input Offset Current

Input Bias Current

Input Noise Voltage

V

= 0V

12

±25

35

50

±90

75

18

±30

35

100

±180

90

nA

OS

B

CM

0.1Hz to 10Hz (Note 3)

nV

P-P

n

2

LT1028/LT1128

ELECTRICAL CHARACTERISTICS ^V_S^{= ±15V, T}_A^{= 25°C, unless otherwise noted.}

LT1028M/C

LT1128M/C

LT1028AM/AC

LT1128AM/AC

SYMBOL PARAMETER

Input Noise Voltage Density

CONDITIONS

f = 10Hz (Note 4)

f = 1000Hz, 100% tested

MIN

TYP

1.00

0.85

MAX

1.7

1.1

MIN

TYP

1.0

0.9

MAX

UNITS

1.9

1.2

nV/√Hz

O

I

Input Noise Current Density

f = 10Hz (Note 3 and 5)

f = 1000Hz, 100% tested

O

4.7

1.0

10.0

1.6

4.7

1.0

12.0

1.8

pA/√Hz

n

O

Input Resistance

Common Mode

Differential Mode

300

20

300

20

MΩ

kΩ

Input Capacitance

Input Voltage Range

5

pF

V

±11.0 ±12.2

CMRR

PSRR

Common-Mode Rejection Ratio

Power Supply Rejection Ratio

Large-Signal Voltage Gain

V

= ±11V

114

117

7.0

5.0

3.0

126

133

30.0

20.0

15.0

110

5.0

3.5

2.0

126

132

30.0

20.0

15.0

dB

V/µV

CM

V = ±4V to ±18V

R ≥ 2k, V = ±12V

R ≥ 1k, V = ±10V

R ≥ 600Ω, V = ±10V

S

A

VOL

L

O

L

O

L

O

V

Maximum Output Voltage Swing

Slew Rate

R ≥ 2k

±12.3 ±13.0

±11.0 ±12.2

11.0 15.0

±12.0 ±13.0

±10.5 ±12.2

V

V/µs

OUT

L

R ≥ 600Ω

L

SR

A

VCL

A

VCL

= –1

LT1028

LT1128

11.0

4.5

15.0

6.0

5.0

6.0

GBW

Gain-Bandwidth Product

f = 20kHz (Note 6)

f = 200kHz (Note 6)

O

LT1028

LT1128

50

13

75

20

50

11

75

20

MHz

O

Z

Open-Loop Output Impedance

Supply Current

V = 0, I = 0

80

7.4

80

7.6

Ω

O

I

9.5

10.5

mA

S

V_S= ±15V, –55°C ≤ T_A≤ 125°C, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

LT1028M

LT1028AM

LT1128AM

TYP

LT1128M

TYP

SYMBOL PARAMETER

CONDITIONS

(Note 1)

MIN

MAX

120

0.8

MIN

MAX

180

1.0

UNITS

µV

µV/°C

V

Input Offset Voltage

●

30

0.2

45

0.25

OS

∆V

Average Input Offset Drift

(Note7)

OS

∆Temp

I

Input Offset Current

Input Bias Current

Input Voltage Range

Common-Mode Rejection Ratio

Power Supply Rejection Ratio

Large-Signal Voltage Gain

V

= 0V

●

25

±40

±10.3 ±11.7

90

±150

30

±50

±10.3 ±11.7

180

±300

nA

V

dB

OS

B

CM

CMRR

PSRR

A

V

CM

= ±10.3V

106

110

3.0

2.0

122

130

14.0

10.0

100

104

2.0

1.5

120

130

14.0

10.0

V = ±4.5V to ±16V

S

R ≥ 2k, V = ±10V

R ≥ 1k, V = ±10V

V/µV

VOL

L

O

L

O

V

Maximum Output Voltage Swing

Supply Current

R ≥ 2k

L

●

±10.3 ±11.6

V

mA

OUT

I

8.7

11.5

9.0

13.0

S

3

LT1028/LT1128

ELECTRICAL CHARACTERISTICS ^V_S^{= ±15V, 0°C ≤ T}_A^{≤ 70°C, unless otherwise noted.}

LT1028C

LT1028AC

LT1128AC

TYP

LT1128C

TYP

SYMBOL PARAMETER

CONDITIONS

(Note 1)

(Note7)

MIN

MAX

80

MIN

MAX

125

1.0

UNITS

µV

µV/°C

V

Input Offset Voltage

●

15

30

OS

∆V

Average Input Offset Drift

0.1

0.8

0.2

OS

∆Temp

I

Input Offset Current

Input Bias Current

Input Voltage Range

Common-Mode Rejection Ratio

Power Supply Rejection Ratio

Large-Signal Voltage Gain

V

= 0V

●

15

±30

±10.5 ±12.0

65

±120

22

±40

±10.5 ±12.0

130

±240

nA

V

dB

OS

B

CM

CMRR

PSRR

A

V

= ±10.5V

110

114

5.0

4.0

124

132

25.0

18.0

106

107

3.0

2.5

124

132

25.0

18.0

CM

V = ±4.5V to ±18V

R ≥ 2k, V = ±10V

R ≥ 1k, V = ±10V

S

V/µV

VOL

L

O

L

O

V

Maximum Output Voltage Swing

Supply Current

R ≥ 2k

R ≥ 600Ω (Note 9)

L

●

±11.5 ±12.7

±9.5 ±11.0

±11.5 ±12.7

±9.0 ±10.5

V

mA

OUT

L

I

8.0

10.5

8.2

11.5

S

ELECTRICAL CHARACTERISTICS ^V_S^{= ±15V, –40°C ≤ T}_A^{≤ 85°C, unless otherwise noted. (Note 10)}

LT1028C

LT1128C

TYP

LT1028AC

LT1128AC

TYP

SYMBOL PARAMETER

CONDITIONS

MIN

MAX

95

0.8

MIN

MAX

150

1.0

UNITS

µV

µV/°C

V

OS

Input Offset Voltage

●

20

0.2

35

0.25

∆V

Average Input Offset Drift

OS

∆Temp

I

Input Offset Current

Input Bias Current

Input Voltage Range

Common-Mode Rejection Ratio

Power Supply Rejection Ratio

Large-Signal Voltage Gain

V

= 0V

●

20

±35

±10.4 ±11.8

80

±140

28

±45

±10.4 ±11.8

160

±280

nA

V

dB

OS

B

CM

CMRR

PSRR

A

V

= ±10.5V

108

112

4.0

3.0

123

131

20.0

14.0

102

106

2.5

2.0

123

131

20.0

14.0

CM

V = ±4.5V to ±18V

R ≥ 2k, V = ±10V

R ≥ 1k, V = ±10V

S

V/µV

VOL

L

O

L

O

V

Maximum Output Voltage Swing

Supply Current

R ≥ 2k

L

●

±11.0 ±12.5

V

mA

OUT

I

8.5

11.0

8.7

12.5

S

The

●

denotes specifications which apply over the full operating

on an RMS basis) is divided by the sum of the two source resistors to

obtain current noise. Maximum 10Hz current noise can be inferred from

100% testing at 1kHz.

Note 6: Gain-bandwidth product is not tested. It is guaranteed by design

and by inference from the slew rate measurement.

temperature range.

Note 1: Input Offset Voltage measurements are performed by automatic

test equipment approximately 0.5 sec. after application of power. In

addition, at T = 25°C, offset voltage is measured with the chip heated to

A

approximately 55°C to account for the chip temperature rise when the

Note 7: This parameter is not 100% tested.

device is fully warmed up.

Note 8: The inputs are protected by back-to-back diodes. Current-limiting

resistors are not used in order to achieve low noise. If differential input

voltage exceeds ±1.8V, the input current should be limited to 25mA.

Note 2: Long Term Input Offset Voltage Stability refers to the average

trend line of Offset Voltage vs. Time over extended periods after the first

30 days of operation. Excluding the initial hour of operation, changes in

Note 9: This parameter guaranteed by design, fully warmed up at T =

A

V

during the first 30 days are typically 2.5µV.

OS

70°C. It includes chip temperature increase due to supply and load

currents.

Note 3: This parameter is tested on a sample basis only.

Note 4: 10Hz noise voltage density is sample tested on every lot with the

exception of the S8 and S16 packages. Devices 100% tested at 10Hz are

available on request.

Note 5: Current noise is defined and measured with balanced source

resistors. The resultant voltage noise (after subtracting the resistor noise

Note 10: The LT1028/LT1128 are not tested and are not quality-

assurance-sampled at –40°C and at 85°C. These specifications are

guaranteed by design, correlation and/or inference from –55°C, 0°C, 25°C,

70°C and /or 125°C tests.

4

LT1028/LT1128

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Wideband Voltage Noise

(0.1Hz to Frequency Indicated)

10Hz Voltage Noise Distribution

Wideband Noise, DC to 20kHz

180

160

140

120

100

80

10

1

V

T

= ±15V

= 25°C

V

T

= ±15V

= 25°C

S

A

158

148

S

A

500 UNITS

MEASURED

FROM 4 RUNS

70

57

60

0.1

0.01

40

28

VERTICAL SCALE = 0.5µV/DIV

HORIZONTAL SCALE = 0.5ms/DIV

20

8

7

4

3

2

1

0

0.8 1.0 1.2

1.4 1.6 1.8 2.0 2.2

VOLTAGE NOISE DENSITY (nV/√Hz)

0.6

100

1k

10k

100k

1M

10M

BANDWIDTH (Hz)

LT1028/1128 • TPC03

LT1020/1120 • TPC01

Total Noise vs Matched Source

Resistance

Total Noise vs Unmatched

Source Resistance

Current Noise Spectrum

100

10

1

100

10

1

100

10

1

R

S

R

S

–

R

S

+

MAXIMUM

1/f CORNER = 800Hz

1/f CORNER = 250Hz

AT 10Hz

AT 1kHz

AT 10Hz

TYPICAL

2 R NOISE ONLY

S

2 R NOISE ONLY

S

V

T

= ±15V

= 25°C

V

T

= ±15V

S

A

S

A

= 25°C

0.1

10

100

1k

10k

1

3

10 30 100 300 1k 3k 10k

1

3

10 30 100 300 1k 3k 10k

FREQUENCY (Hz)

MATCHED SOURCE RESISTANCE (Ω)

UNMATCHED SOURCE RESISTANCE (Ω)

LT1028/1128 • TPC06

LT1028/1128 • TPC04

LT1028/1128 • TPC05

0.1Hz to 10Hz Voltage Noise

0.01Hz to 1Hz Voltage Noise

Voltage Noise vs Temperature

2.0

1.6

1.2

0.8

O.4

0

V

= ±15V

V

T

= ±15V

= 25°C

V

T

= ±15V

= 25°C

S

A

S

A

AT 10Hz

AT 1kHz

10nV

20

40

60

80

100

–50

–25

0

25

50

75 100 125

0

2

4

6

8

10

TEMPERATURE (°C)

TIME (SEC)

LT1028/1128 • TPC07

LT1028/1128 • TPC09

LT1028/1128 • TPC07

5

LT1028/LT1128

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Offset Voltage Drift with

Long-Term Stability of Five

Representative Units

Distribution of Input Offset

Voltage

Temperature of Representative Units

50

40

20

18

16

14

12

10

8

10

8

V = ±15V

S

V

T

= ±15V

= 25°C

V

T

= ±15V

= 25°C

S

A

t = 0 AFTER 1 DAY PRE-WARM UP

800 UNITS TESTED

FROM FOUR RUNS

30

6

20

4

10

2

0

–10

–20

–30

–40

–50

–2

–4

–6

–8

–10

6

4

2

0

–50

0

25

50

75 100 125

–25

–50 –40 –30 –20 –10

0

10 20 30 40 50

0

1

2

3

4

5

TEMPERATURE (°C)

OFFSET VOLTAGE (µV)

TIME (MONTHS)

LT1028/1128 • TPC11

LT1028/1128 • TPC10

LT1028/1128 • TPC12

Input Bias and Offset Currents

Over Temperature

Bias Current Over the Common-

Mode Range

Warm-Up Drift

24

20

60

50

40

30

100

80

V

= ±15V

= 0V

V

T

= ±15V

= 25°C

S

CM

20V

65nA

V

S

T

A

= ±15V

= 25°C

S

A

R

=

≈ 300MΩ

CM

60

POSITIVE INPUT CURRENT

(UNDERCANCELLED) DEVICE

40

16

12

METAL CAN (H) PACKAGE

20

0

BIAS CURRENT

8

4

0

–20

–40

–60

20

10

0

DUAL-IN-LINE PACKAGE

NEGATIVE INPUT CURRENT

(OVERCANCELLED) DEVICE

OFFSET CURRENT

PLASTIC (N) OR CERDIP (J)

–80

0

1

2

3

4

5

50

TEMPERATURE (˚C)

100 125

–50 –25

0

25

75

–15

5

10

15

–10

–5

0

TIME AFTER POWER ON (MINUTES)

COMMON-MODE INPUT VOLTAGE (V)

LT1028/1128 • TPC13

LT1028/1128 • TPC14

LT1028/1128 • TPC15

Output Short-Circuit Current

vs Time

Voltage Noise vs Supply Voltage

Supply Current vs Temperature

10

9

8

7

6

5

4

3

2

1

0

50

40

1.5

1.25

1.0

V

= ±15V

T

= 25°C

–50°C

25°C

S

A

V

= ±15V

= ±5V

S

30

125°C

20

10

AT 10Hz

AT 1kHz

0

–10

–20

–30

–40

–50

125°C

25°C

0.75

0.5

–50°C

–50

0

25

50

75 100 125

–25

0

±5

±10

±15

±20

0

2

3

1

TEMPERATURE (°C)

TIME FROM OUTPUT SHORT TO GROUND (MINUTES)

SUPPLY VOLTAGE (V)

LT1028/1128 • TPC17

LT1028/1128 • TPC16

LT1028/1128 • TPC18

6

LT1028/LT1128

U W

TYPICAL PERFOR A CE CHARACTERISTICS

LT1028

Capacitance Load Handling

LT1028

Voltage Gain vs Frequency

Gain, Phase vs Frequency

70

60

50

40

30

20

70

60

50

40

30

20

160

140

120

100

80

70

60

50

40

30

20

10

0

30pF

PHASE

V

T

= ±15V

= 25°C

= 2k

S

2k

A

R

L

R_S

–

+

C_L

LT1128

LT1028

A

= –1, R = 2k

S

V

60

GAIN

A

S

= –10

V

40

R

= 200Ω

10

0

10

0

20

A

= –100

V

R

V

T

= ±15V

= 25°C

= 10pF

S

A

L

= 20Ω

S

V

T

= ±15V

= 25°C

S

A

0

C

–10

10k

–10

100M

–20

100k

1M

10M

10

100

1000

10000

0.01 0.1

1

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

FREQUENCY (Hz)

CAPACITIVE LOAD (pF)

LT1028/1128 • TPC20

LT1028/1128 • TPC21

LT1028/1128 • TPC19

LT1128

Gain Phase vs Frequency

Gain Error vs Frequency

Closed-Loop Gain = 1000

LT1128

Capacitance Load Handling

1

0.1

70

60

50

40

30

20

70

60

50

40

30

20

80

70

60

50

40

30

20

10

0

30pF

TYPICAL

PRECISION

OP AMP

2k

PHASE

R_S

–

LT1128

+

C_L

A

= –1, R = 2k

S

V

LT1028

A

S

= –10

V

0.01

0.001

GAIN

1M

R

= 200Ω

10

0

10

0

V

= ±15V

= 25°C

= 10mV

S

A

O

V

= ±15V

= 25°C

= 10pF

S

A

T

CLOSED-LOOP GAIN

OPEN-LOOP GAIN

GAIN ERROR =

1

V

P-P

10000

C

L

A

= –100, R = 20Ω

V

S

–10

100M

0.1

10

100

10k

100k

10M

10

100

1000

FREQUENCY (Hz)

CAPACITIVE LOAD (pF)

LT1028/1128 • TPC22

LT1028/1128 • TPC23

LT1028/1128 • TPC 24

Maximum Undistorted Output

vs Frequency

Voltage Gain vs Supply Voltage

Voltage Gain vs Load Resistance

100

10

1

30

25

20

15

10

5

100

10

1

T

= 25°C

V

S

= ±15V

A

V

= ±15V

= 25°C

= 2k

S

A

L

T

R

L

= 2k

T

= 25°C

A

T

A

= –55°C

T

= 125°C

A

R

= 600Ω

L

LT1128

LT1028

I

= 35mA AT –55°C

= 27mA AT 25°C

= 16mA AT 125°C

LMAX

1

0.1

10

10k

100k

1M

10M

0

±5

±10

±20

±15

LOAD RESISTANCE (kΩ)

FREQUENCY (Hz)

SUPPLY VOLTAGE (V)

LT1028/1128 • TPC26

LT1028/1128 • TPC27

LT`1028/1128 • TPC25

7

LT1028/LT1128

TYPICAL PERFOR A CE CHARACTERISTICS

U W

LT1028

Slew Rate, Gain-Bandwidth

Product Over Temperature

LT1028

Small-Signal Transient Response

Large-Signal Transient Response

18

17

16

15

90

80

70

60

V

= ±15V

S

50mV

10V

GBW

FALL

RISE

–10V

–50mV

14

13

12

50

40

30

1µs/DIV

0.2µs/DIV

A_V= –1, R_S= R_F= 2k

C_F= 15pF, C_L= 80pF

A_V= –1, R_S= R_F= 2k, C_F= 15pF

50

TEMPERATURE (˚C)

100 125

–50 –25

0

25

75

LT1028/1128 • TPC30

LT1128

Slew Rate, Gain-Bandwidth

Product Over Temperature

LT1128

Large-Signal Transient Response

Small-Signal Transient Response

9

8

7

6

5

4

3

2

1

FALL

50mV

10V

RISE

GBW

30

20

10

0V

–10V

–50mV

2µs/DIV

0.2µs/DIV

A_V= +1, C_L= 10pF

A_V= –1, R_S= R_F= 2k, C_F= 30pF

0

–50

50

75 100 125

–25

0

25

TEMPERATURE (°C)

LT1028/1128 • TPC33

LT1128

LT1028

Slew Rate, Gain-Bandwidth Product

Closed-Loop Output Impedance

vs Over-Compensation Capacitor

100

1k

100

10

1

10k

1k

100

10

I

= 1mA

= ±15V

= 25°C

O

S

A

V

LT1128

T

LT1028

SLEW

GBW

10

1

100

A

= +1000

LT1128

V

1

SLEW RATE

0.1

10

100

10

A

= +5

V

0.01

0.001

C

V

FROM PIN 5 TO PIN 6

= ±15V

= 25°C

OC

S

A

LT1028

T

0.1

1

0.1

10

100

1k

10k

100k

1M

1

10

100

1000

10000

1

10

100

1000

10000

OVER-COMPENSATION CAPACITOR (pF)

FREQUENCY (Hz)

OVER-COMPENSATION CAPACITOR (pF)

LT1028/1128 • TPC35

LT1028/1128 • TPC36

LT1028/1128 • TPC34

8

LT1028/LT1128

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Common-Mode Limit Over

Temperature

Common-Mode Rejection Ratio

vs Frequency

Power Supply Rejection Ratio

vs Frequency

+

V

140

120

100

80

160

140

120

100

80

V

T

= ±15V

= 25°C

S

A

V

= ±15V

= 25°C

–1

–2

–3

–4

S

A

T

V

= ±5V

S

= ±15V

NEGATIVE

SUPPLY

LT1128

LT1028

POSITIVE

SUPPLY

60

4

3

2

1

60

40

V

= ±5V TO ±15V

40

S

20

–

V

0

–50

0

25

50

75 100 125

–25

100k

10M

100 1k

10

100

1k

10k

1M

0.1

1

10

10k 100k 1M 10M

TEMPERATURE (°C)

FREQUENCY (Hz)

LT1028/1128 • TPC37

LT1028/1128 • TPC38

LT1028/1128 • TPC39

LT1028

Total Harmonic Distortion vs

Closed-Loop Gain

Total Harmonic Distortion vs

High Frequency Voltage Noise

vs Frequency

Frequency and Load Resistance

10

1.0

0.1

0.01

V

= 20V

P-P

A

= +1000

L

O

V

f = 1kHz

R

= 2k

NON-INVERTING

GAIN

V

= ±15V

= 25°C

= 10k

S

A

= +1000

= 600Ω

V

L

T

R

L

0.01

A

= –1000

= 2k

V

L

R

INVERTING

GAIN

0.001

0.0001

A

= +1000

= 600Ω

V

L

R

V

= 20V

P-P

= ±15V

= 25°C

O

S

A

MEASURED

EXTRAPOLATED

T

0.001

10k

100k

FREQUENCY (Hz)

1M

1

10

FREQUENCY (kHz)

100

10

100

1k

10k 100k

CLOSED LOOP GAIN

LT1028/1128 • TPC42

LT1028/1128 • TPC40

LT1028/1128 • TPC41

LT1128

Total Harmonic Distortion vs

Frequency and Load Resistance

LT1128

Total Harmonic Distortion vs

Closed-Loop Gain

1.0

0.1

0.01

V

= 20V

P-P

O

NON-INVERTING

GAIN

f = 1kHz

V

T

= ±15V

A

= +1000

= 600Ω

S

V

L

= 25°C

R

A

= +1000

L

V

R

= 10k

L

= 2k

A

= –1000

= 2k

V

L

R

INVERTING

GAIN

A

= +1000

= 600Ω

V

L

0.01

0.001

R

V

= 20V

P-P

O

S

A

MEASURED

= ±15V

= 25°C

EXTRAPOLATED

T

0.0001

1.0

10

FREQUENCY (kHz)

100

10

100

1k

10k

100k

CLOSED LOOP GAIN

LT1028/1128 • TPC43

LT1028/1128 • TPC44

9

LT1028/LT1128

O U

W

U U

PPLICATI

A

S

I FOR ATIO

– OISE

Voltage Noise vs Current Noise

largest term, as in the example above, and the LT1028/

LT1128’s voltage noise becomes negligible. As R_eqis

further increased, current noise becomes important. At

1kHz, when R_eqis in excess of 20k, the current noise

componentislargerthantheresistornoise.Thetotalnoise

versus matched source resistance plot illustrates the

above calculations.

The LT1028/LT1128’s less than 1nV/√Hz voltage noise is

threetimesbetterthanthelowestvoltagenoiseheretofore

available(ontheLT1007/1037). Anecessaryconditionfor

suchlowvoltagenoiseisoperatingtheinputtransistorsat

nearly 1mA of collector currents, because voltage noise is

inversely proportional to the square root of the collector

current. Currentnoise, however, isdirectlyproportionalto

the square root of the collector current. Consequently, the

LT1028/LT1128’s current noise is significantly higher

than on most monolithic op amps.

The plot also shows that current noise is more dominant

at low frequencies, such as 10Hz. This is because resistor

noise is flat with frequency, while the 1/f corner of current

noise is typically at 250Hz. At 10Hz when R_eq> 1k, the

current noise term will exceed the resistor noise.

Therefore, to realize truly low noise performance it is

important to understand the interaction between voltage

noise (e_n), current noise (I_n) and resistor noise (r_n).

When the source resistance is unmatched, the total noise

versus unmatched source resistance plot should be con-

sulted. Note that total noise is lower at source resistances

below 1k because the resistor noise contribution is less.

When R_S> 1k total noise is not improved, however. This

is because bias current cancellation is used to reduce

input bias current. The cancellation circuitry injects two

correlated current noise components into the two inputs.

With matched source resistors the injected current noise

creates a common-mode voltage noise and gets rejected

by the amplifier. With source resistance in one input only,

the cancellation noise is added to the amplifier’s inherent

noise.

Total Noise vs Source Resistance

The total input referred noise of an op amp is given by

e_t= [e_n²+ r_n²+ (I_nR_eq)²]^1/2

where R_eqis the total equivalent source resistance at the

two inputs, and

r_n= √4kTR_eq= 0.13√R_eqin nV/√Hz at 25°C

As a numerical example, consider the total noise at 1kHz

of the gain 1000 amplifier shown below.

In summary, the LT1028/LT1128 are the optimum ampli-

fiers for noise performance, provided that the source

resistance is kept low. The following table depicts which

op amp manufactured by Linear Technology should be

used to minimize noise, as the source resistance is in-

creased beyond the LT1028/LT1128’s level of usefulness.

100Ω

100k

–

LT1028

LT1128

+

1028/1128 AI01

Best Op Amp for Lowest Total Noise vs Source Resistance

BEST OP AMP

SOURCE RESIS-

TANCE(

0 to 400

400 to 4k

4k to 40k

40k to 500k

500k to 5M

>5M

R_eq= 100Ω + 100Ω || 100k ≈ 200Ω

r_n= 0.13√200 = 1.84nV√Hz

e_n= 0.85nV√Hz

AT LOW FREQ(10Hz)

WIDEBAND(1kHz)

Ω) (Note 1)

LT1028/LT1128

LT1007/1037

LT1001

LT1028/LT1128

LT1007/1037

LT1001

LT1012

LT1055

I_n= 1.0pA/√Hz

e_t= [0.85²+ 1.84²+ (1.0 × 0.2) ²]^1/2= 2.04nV/√Hz

Output noise = 1000 e_t= 2.04µV/√Hz

LT1012

LT1012 or LT1055

LT1055

Note 1: Source resistance is defined as matched or unmatched, e.g.,

R = 1k means: 1k at each input, or 1k at one input and zero at the other.

At very low source resistance (R_eq< 40Ω) voltage noise

dominates.AsR_eqisincreasedresistornoisebecomesthe

S

10

LT1028/LT1128

O U

W

U

PPLICATI

A

S

I FOR ATIO

– OISE

Measuring the typical 35nV peak-to-peak noise perfor-

mance of the LT1028/LT1128 requires special test pre-

cautions:

Noise Testing – Voltage Noise

The LT1028/LT1128's RMS voltage noise density can be

accurately measured using the Quan Tech Noise Analyzer,

Model 5173 or an equivalent noise tester. Care should be

taken,however,tosubtractthenoiseofthesourceresistor

used. Prefabricated test cards for the Model 5173 set the

device under test in a closed-loop gain of 31 with a 60Ω

source resistor and a 1.8k feedback resistor. The noise of

this resistor combination is 0.13√58 = 1.0nV/√Hz. An

LT1028/LT1128 with 0.85nV/√Hz noise will read (0.85²+

1.0²)^1/2= 1.31nV/√Hz. For better resolution, the resistors

should be replaced with a 10Ω source and 300Ω feedback

resistor. Even a 10Ω resistor will show an apparent noise

which is 8% to 10% too high.

(a) The device should be warmed up for at least five

minutes. As the op amp warms up, its offset voltage

changes typically 10µV due to its chip temperature

increasing 30°C to 40°C from the moment the power

supplies are turned on. In the 10 second measure-

ment interval these temperature-induced effects can

easily exceed tens of nanovolts.

(b) For similar reasons, the device must be well shielded

from air current to eliminate the possibility of thermo-

electric effects in excess of a few nanovolts, which

would invalidate the measurements.

The 0.1Hz to 10Hz peak-to-peak noise of the LT1028/

LT1128 is measured in the test circuit shown. The fre-

quency response of this noise tester indicates that the

0.1Hz corner is defined by only one zero. The test time to

measure 0.1Hz to 10Hz noise should not exceed 10

seconds, as this time limit acts as an additional zero to

eliminate noise contributions from the frequency band

below 0.1Hz.

(c) Sudden motion in the vicinity of the device can also

“feedthrough” to increase the observed noise.

A noise-voltage density test is recommended when mea-

suring noise on a large number of units. A 10Hz noise-

voltage density measurement will correlate well with a

0.1Hz to 10Hz peak-to-peak noise reading since both

results are determined by the white noise and the location

of the 1/f corner frequency.

0.1Hz to 10Hz Peak-to-Peak Noise

Tester Frequency Response

0.1Hz to 10Hz Noise Test Circuit

100

0.1µF

90

100k

80

–

2k

70

22µF

+

100Ω

*

SCOPE

4.3k

× 1

60

+

LT1001

4.7µF

R

IN

= 1M

–

50

40

30

2.2µF

110k

100k

VOLTAGE GAIN = 50,000

* DEVICE UNDER TEST

0.1µF

24.3k

0.01

0.1

1.0

10

100

NOTE ALL CAPACITOR VALUES ARE FOR

NONPOLARIZED CAPACITORS ONLY

1028/1128 AI02

FREQUENCY (Hz)

LT1028/1128 • AI03

11

LT1028/LT1128

O U

W

U U

PPLICATI

A

S

I FOR ATIO

– OISE

Noise Testing – Current Noise

10Hz voltage noise density is sample tested on every lot.

Devices 100% tested at 10Hz are available on request for

an additional charge.

Current noise density (I_n) is defined by the following

formula, and can be measured in the circuit shown:

10Hz current noise is not tested on every lot but it can be

inferred from 100% testing at 1kHz. A look at the current

noise spectrum plot will substantiate this statement. The

only way 10Hz current noise can exceed the guaranteed

limits is if its 1/f corner is higher than 800Hz and/or its

whitenoiseishigh. Ifthatisthecasethenthe1kHztestwill

fail.

[e ²– (31 × 18.4nV/√Hz)²]^1/2

no

I =

n

20k × 31

1.8k

10k

–

LT1028

LT1128

e

60Ω

no

Automated Tester Noise Filter

+

1028/1128 AI04

10

0

–10

–20

If the Quan Tech Model 5173 is used, the noise reading is

input-referred, therefore the result should not be divided

by 31; the resistor noise should not be multiplied by 31.

CURRENT

NOISE

VOLTAGE

NOISE

100% Noise Testing

–30

–40

–50

The 1kHz voltage and current noise is 100% tested on the

LT1028/LT1128aspartofautomatedtesting;theapproxi-

matefrequencyresponseofthefiltersisshown. Thelimits

on the automated testing are established by extensive

correlation tests on units measured with the Quan Tech

Model 5173.

100

1k

10k

100k

FREQUENCY (Hz)

LT1028/1128 • AI05

O U

W

U

PPLICATI

A

S I FOR ATIO

1k

15V

General

1

2

3

8

–

The LT1028/LT1128 series devices may be inserted di-

rectly into OP-07, OP-27, OP-37, LT1007 and LT1037

sockets with or without removal of external nulling com-

ponents. In addition, the LT1028/LT1128 may be fitted to

5534 sockets with the removal of external compensation

components.

7

6

LT1028

LT1128

INPUT

OUTPUT

+

4

1028/1128 AI06

–15V

than zero creates a drift of (V_OS/300)µV/°C, e.g., if V_OSis

adjusted to 300µV, the change in drift will be 1µV/°C.

Offset Voltage Adjustment

The adjustment range with a 1k pot is approximately

±1.1mV.

TheinputoffsetvoltageoftheLT1028/LT1128anditsdrift

with temperature, are permanently trimmed at wafer test-

ing to a low level. However, if further adjustment of V_OSis

necessary, the use of a 1k nulling potentiometer will not

degrade drift with temperature. Trimming to a value other

Offset Voltage and Drift

Thermocouple effects, caused by temperature gradients

across dissimilar metals at the contacts to the input

12

LT1028/LT1128

O U

W

U

PPLICATI

A

S I FOR ATIO

terminals, can exceed the inherent drift of the amplifier

unless proper care is exercised. Air currents should be

minimized, package leads should be short, the two input

leadsshouldbeclosetogetherandmaintainedatthesame

temperature.

Frequency Response

TheLT1028’sGain, PhasevsFrequencyplotindicatesthat

the device is stable in closed-loop gains greater than +2 or

–1 because phase margin is about 50° at an open-loop

gain of 6dB. In the voltage follower configuration phase

margin seems inadequate. This is indeed true when the

output is shorted to the inverting input and the noninvert-

ing input is driven from a 50Ω source impedance. How-

ever, when feedback is through a parallel R-C network

(provided C_F< 68pF), the LT1028 will be stable because of

interaction between the input resistance and capacitance

and the feedback network. Larger source resistance at the

noninverting input has a similar effect. The following

voltage follower configurations are stable:

The circuit shown to measure offset voltage is also used

as the burn-in configuration for the LT1028/LT1128.

Test Circuit for Offset Voltage

and Offset Voltage Drift with Temperature

10k*

15V

2

7

–

6

LT1028

LT1128

V

O

200Ω*

3

+

4

33pF

10k*

–15V

2k

V

= 100V

O

OS

* RESISTORS MUST HAVE LOW

THERMOELECTRIC POTENTIAL

1028/1128 AI08

–

+

–

+

LT1028

500Ω

50Ω

Unity-Gain Buffer Applications (LT1128 Only)

When R_F≤ 100Ω and the input is driven with a fast, large-

signal pulse (>1V), the output waveform will look as

shown in the pulsed operation diagram.

50Ω

1028/1128 AI09

R

F

Another configuration which requires unity-gain stability

is shown below. When C_Fis large enough to effectively

short the output to the input at 15MHz, oscillations can

occur. The insertion of R_S2≥ 500Ω will prevent the

LT1028fromoscillating. WhenR_S1≥500Ω, theadditional

noise contribution due to the presence of R_S2will be

minimal. When R_S1≤ 100Ω, R_S2is not necessary, be-

cause R_S1represents a heavy load on the output through

theC_Fshort.When100Ω<R_S1<500Ω,R_S2shouldmatch

R_S1. For example, R_S1= R_S2= 300Ω will be stable. The

noise increase due to R_S2is 40%.

–

+

OUTPUT

6V/µs

1028/1128 AI07

During the fast feedthrough-like portion of the output, the

input protection diodes effectively short the output to the

inputandacurrent, limitedonlybytheoutputshort-circuit

protection, will be drawn by the signal generator. With R_F

≥ 500Ω, the output is capable of handling the current

requirements (I_L≤ 20mA at 10V) and the amplifier stays

in its active mode and a smooth transition will occur.

C1

As with all operational amplifiers when R_F> 2k, a pole will

be created with R_Fand the amplifier’s input capacitance,

creating additional phase shift and reducing the phase

margin.Asmallcapacitor(20pFto50pF)inparallelwithR_F

will eliminate this problem.

R1

R

S1

–

+

LT1028

R

S2

1028/1128 AI10

13

LT1028/LT1128

O U

W

U

PPLICATI

A

S I FOR ATIO

tion has a high (≈70%) overshoot without the 10pF

capacitor because of additional phase shift caused by the

feedback resistor – input capacitance pole. The presence

of the 10pF capacitor cancels this pole and reduces

overshoot to 5%.

If C_Fis only used to cut noise bandwidth, a similar effect

can be achieved using the over-compensation terminal.

The Gain, Phase plot also shows that phase margin is

about 45° at gain of 10 (20dB). The following configura-

10pF

Over-Compensation

10k

The LT1028/LT1128 are equipped with a frequency over-

compensation terminal (pin 5). A capacitor connected

between pin 5 and the output will reduce noise bandwidth.

Details are shown on the Slew Rate, Gain-Bandwidth

Product vs Over-Compensation Capacitor plot. An addi-

tional benefit is increased capacitive load handling capa-

bility.

1.1k

–

LT1028

+

50Ω

1028/1128 AI11

U

O

TYPICAL APPLICATI

Strain Gauge Signal Conditioner with Bridge Excitation

Low Noise Voltage Regulator

28V

10

15V

+

7

121Ω

330Ω

3

5.0V

+

–

LT1021-5

LT317A

6

LT1128

10

2.3k

2

PROVIDES PRE-REG

AND CURRENT

LIMITING

4

28V

–15V

REFERENCE

OUTPUT

1k

+

–

LT1021-10

15V

7

350Ω

BRIDGE

330Ω

LT1028

2N6387

3

–

6

0V TO 10V

OUTPUT

LT1028

301k*

1000pF

20V OUTPUT

10k

ZERO

TRIM

2

+

1µF

4

30.1k*

2k

–15V

15V

7

5k

GAIN

TRIM

3

2

–

49.9Ω*

*RN60C FILM RESISTORS

6

LT1028

1028/1128 TA04

+

330Ω

4

THE LT1028’s NOISE CONTRIBUTION IS NEGLIGIBLE

COMPARED TO THE BRIDGE NOISE.

–15V

1028/1128 TA05

14

LT1028/LT1128

U

O

TYPICAL APPLICATI

Paralleling Amplifiers to Reduce Voltage Noise

Phono Preamplifier

10Ω

+

1.5k

A1

787Ω

15V

0.1µF

LT1028

–

10k

2

3

7

0.33µF

–

+

7.5Ω

470Ω

6

OUTPUT

100pF

47k

LT1028

4.7k

+

4

1.5k

A2

LT1028

–

+

–15V

OUTPUT

LT1028

ALL RESISTORS METAL FILM

–

MAG PHONO

INPUT

470Ω

1028/1128 TA06

+

An

LT1028

Tape Head Amplifier

–

0.1µF

499Ω

470Ω

31.6k

1. ASSUME VOLTAGE NOISE OF LT1028 AND 7.Ω5 SOURCE RESISTOR = 0.9nV/√Hz.

2. GAIN WITH n LT1028s IN PARALLEL = n× 200.

10Ω

2

3. OUTPUT NOISE =√n × 200 × 0.9nV/√Hz.

–

0.9

√n

6

OUTPUT NOISE

4. INPUT REFERRED NOISE =

=

nV√/Hz.

OUTPUT

LT1028

n × 200

3

TAPE HEAD

INPUT

5. NOISE CURRENT AT INPUT INCREASES√n TIMES.

+

2µV

√5

6. IF n = 5, GAIN = 1000, BANDWIDTH = 1MHz, RMS NOISE, DC TO 1MHz =

= 0.µ9V.

1028/1128 TA03

1028/1128 TA07

ALL RESISTORS METAL FILM

Low Noise, Wide Bandwidth Instrumentation Amplifier

Gyro Pick-Off Amplifier

–INPUT

+

300Ω

10k

LT1028

GYRO TYPICAL–

NORTHROP CORP.

GR-F5AH7-5B

–

820Ω

68pF

SINE

DRIVE

50Ω

10Ω

+

–

+

OUTPUT TO SYNC

DEMODULATOR

68pF

300Ω

LT1028

820Ω

•

OUTPUT

LT1028

–

+

–

1k

LT1028

+INPUT

10k

100Ω

GAIN = 1000, BANDWIDTH = 1MHz

INPUT REFERRED NOISE = 1.5nV/√Hz AT 1kHz

WIDEBAND NOISE –DC to 1MHz = 3µV

1028/1128 TA09

RMS

IF BW LIMITED TO DC TO 100kHz = 0.55µV

1028/1128 TA08

RMS

15

LT1028/LT1128

U

O

TYPICAL APPLICATI

Chopper-Stabilized Amplifier

Super Low Distortion Variable Sine Wave Oscillator

R1

C2

C1

0.047

15V

0.047

20Ω

2k

1N758

3

2

7

+

6

LT1052

1V

RMS

OUTPUT

20Ω

8

+

1.5kHz TO 15kHz

–

2k

1

4

f =

LT1028

(

)

2 RC

1

R2

–

0.1

WHERE R1C1 = R2C2

4.7k

0.01

15V

5.6k

2.4k

LT1004-1.2V

1N758

10pF

15V

22k

–15V

15µF

130Ω

68Ω

30k

100k

MOUNT 1N4148s

IN CLOSE PROXIMITY

1

7

–

+

10k

3

2N4338

INPUT

+

100k

8

LT1055

LT1028

OUTPUT

10k

560Ω

TRIM FOR

LOWEST

DISTORTION

2

20k

–

4

10k

–15V

<0.0018% DISTORTION AND NOISE.

MEASUREMENT LIMITED BY RESOLUTION OF

HP339A DISTORTION ANALYZER

10Ω

1028/1128 TA10

1028/1128 TA11

Low Noise Infrared Detector

5V

10Ω

+

100µF

1k

33Ω

SYNCHRONOUS

DEMODULATOR

+

100µF

10k*

5V

OPTICAL

CHOPPER

WHEEL

267Ω

5V

1000µF

2

7

3

2

7

5V

7

+

IR

1/4 LTC1043

6

2

6

LM301A

RADIATION

+

13

LT1028

39Ω

8

3

6

8

12

16

–

1M

DC OUT

LT1012

PHOTO-

ELECTRIC

PICK-OFF

–

1

4

10k

8

3

4

–

1

–5V

14

–5V

30pF

4

INFRA RED ASSOCIATES, INC.

HgCdTe IR DETECTOR

13Ω AT 77°K

–5V

10Ω

1028/1128 TA12

16

LT1028/LT1128

W

SCHE ATIC DIAGRA

NULL

8

+

V

7

R5

130Ω

R6

130Ω

NULL

1

Q4

1.1mA

2.3mA

400µA

R2

3k

R1

3k

C1

257pF

500µA

R10

400Ω

R11

400Ω

Q17

Q16

Q19

Q18

R10

500Ω

900µA

C2

Q26

Q6

Q5

1

3

1

Q11

R11

100Ω

Q22

NON-

INVERTING

INPUT

Q9

Q8

Q7

C3

250pF

4.5µA

3

Q10

4.5µA

OUTPUT

Q24

6

4.5µA

Q25

Q2

Q1

1.5µA

Q12

C4

35pF

R12

240Ω

Q13

Q14

Q27

1.5µA

INTERVING

INPUT

0

2

1.8mA

300µA

Q3

Q15

Q23

BIAS

Q21

R8

480Ω

600µA

R7

80Ω

Q20

–

V

4

OVER-

COMP

5

1028/1128 TA13

C2 = 50pF for LT1028

C2 = 275pF for LT1128

17

LT1028/LT1128

U

Dimensions in inches (millimeters) unless otherwise noted.

J8 Package

PACKAGE DESCRIPTIO

0.405

8-Lead Ceramic DIP

(10.287)

MAX

0.005

(0.127)

MIN

0.200

(5.080)

MAX

0.290 – 0.320

(7.366 – 8.128)

6

5

4

8

7

0.015 – 0.060

(0.381 – 1.524)

0.025

(0.635)

RAD TYP

0.220 – 0.310

(5.588 – 7.874)

0.008 – 0.018

0° – 15°

(0.203 – 0.460)

1

2

3

0.055

(1.397)

MAX

0.038 – 0.068

(0.965 – 1.727)

0.385 ± 0.025

(9.779 ± 0.635)

0.125

3.175

MIN

0.100 ± 0.010

0.014 – 0.026

(2.540 ± 0.254)

(0.360 – 0.660)

T_JMAX

θ_JA

165°C 100°C/W

N8 Package

8-Lead Plastic DIP

0.400

(10.160)

MAX

0.130 ± 0.005

(3.302 ± 0.127)

0.300 – 0.320

(7.620 – 8.128)

0.045 – 0.065

(1.143 – 1.651)

8

7

6

5

4

0.065

(1.651)

TYP

0.250 ± 0.010

(6.350 ± 0.254)

0.009 – 0.015

(0.229 – 0.381)

0.125

(3.175)

MIN

0.020

(0.508)

MIN

+0.025

–0.015

1

2

3

0.045 ± 0.015

(1.143 ± 0.381)

0.325

+0.635

8.255

(

)

–0.381

0.100 ± 0.010

(2.540 ± 0.254)

0.018 ± 0.003

(0.457 ± 0.076)

T_JMAX

θ_JA

130°C 130°C/W

S8 Package

8-Lead Plastic SOIC

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)

0.228 – 0.244

0.150 – 0.157

0.016 – 0.050

0.406 – 1.270

(5.791 – 6.197)

(3.810 – 3.988)

0.050

(1.270)

BSC

0.014 – 0.019

(0.355 – 0.483)

0°– 8° TYP

T_JMAX

θ_JA

1

2

3

4

135°C 140°C/W

18

LT1028/LT1128

U

Dimensions in inches (millimeters) unless otherwise noted.

PACKAGE DESCRIPTIO

S Package

16-Lead Plastic SOL

0.398 – 0.413

(10.109 – 10.490)

0.291 – 0.299

(7.391 – 7.595)

15 14

12

10

9

16

13

11

0.037 – 0.045

(0.940 – 1.143)

0.093 – 0.104

(2.362 – 2.642)

0.005

(0.127)

RAD MIN

0.010 – 0.029

× 45°

(0.254 – 0.737)

0° – 8° TYP

0.394 – 0.419

(10.007 – 10.643)SOL16

SEE NOTE

0.050

(1.270)

TYP

0.004 – 0.012

(0.102 – 0.305)

0.009 – 0.013

(0.229 – 0.330)

SEE NOTE

0.014 – 0.019

0.016 – 0.050

(0.406 – 1.270)

(0.356 – 0.482)

TYP

NOTE:

PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.

THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS.

2

3

5

7

8

1

4

6

T_JMAX

θ_JA

140°C 130°C/W

H Package

8-Lead TO-5 Metal Can

0.335 – 0.370

(8.509 – 9.398)

DIA

0.305 – 0.335

(7.747 – 8.509)

0.027 – 0.045

(0.686 – 1.143)

0.040

(1.016)

MAX

45°TYP

0.050

(1.270)

MAX

0.027 – 0.034

0.165 – 0.185

(4.191 – 4.699)

(0.686 – 0.864)

1

5

8

2

0.200 – 0.230

REFERENCE

PLANE

3

7

6

SEATING

PLANE

(5.080 – 5.842)

GAUGE

PLANE

0.500 – 0.750

(12.70 – 19.05)

BSC

4

0.010 – 0.045

(0.254 – 1.143)

0.110 – 0.160

0.016 – 0.021

(2.794 – 4.064)

INSULATING

STANDOFF

(0.406 – 0.533)

TYP

T_JMAX

θ_JA

θ_JC

NOTE: LEAD DIAMETER IS UNCONTROLLED BETWEEN

THE REFERENCE PLANE AND SEATING PLANE.

175°C 140°C/W 40°C/W

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.

19

LT1028/LT1128

U.S. Area Sales Offices

NORTHEAST REGION

Linear Technology Corporation

One Oxford Valley

CENTRAL REGION

Linear Technology Corporation

Chesapeake Square

NORTHWEST REGION

Linear Technology Corporation

782 Sycamore Dr.

2300 E. Lincoln Hwy.,Suite 306

Langhorne, PA 19047

Phone: (215) 757-8578

FAX: (215) 757-5631

229 Mitchell Court, Suite A-25

Addison, IL 60101

Phone: (708) 620-6910

FAX: (708) 620-6977

Milpitas, CA 95035

Phone: (408) 428-2050

FAX: (408) 432-6331

SOUTHEAST REGION

Linear Technology Corporation

17060 Dallas Parkway

Suite 208

SOUTHWEST REGION

Linear Technology Corporation

22141 Ventura Blvd.

Suite 206

Dallas, TX 75248

Phone: (214) 733-3071

FAX: (214) 380-5138

Woodland Hills, CA 91364

Phone: (818) 703-0835

FAX: (818) 703-0517

International Sales Offices

FRANCE

KOREA

TAIWAN

Linear Technology S.A.R.L.

Immeuble "Le Quartz"

58 Chemin de la Justice

92290 Chatenay Mallabry

France

Linear Technology Korea Branch

Namsong Building, #505

Itaewon-Dong 260-199

Yongsan-Ku, Seoul

Korea

Linear Technology Corporation

Rm. 801, No. 46, Sec. 2

Chung Shan N. Rd.

Taipei, Taiwan, R.O.C.

Phone: 886-2-521-7575

FAX: 886-2-562-2285

Phone: 33-1-46316161

FAX: 33-1-46314613

Phone: 82-2-792-1617

FAX: 82-2-792-1619

GERMANY

SINGAPORE

UNITED KINGDOM

Linear Techonolgy GMBH

Untere Hauptstr. 9

D-8057 Eching

Linear Technology Pte. Ltd.

101 Boon Keng Road

#02-15 Kallang Ind. Estates

Singapore 1233

Linear Technology (UK) Ltd.

The Coliseum, Riverside Way

Camberley, Surrey GU15 3YL

United Kingdom

Germany

Phone: 49-89-3197410

FAX: 49-89-3194821

Phone: 65-293-5322

FAX: 65-292-0398

Phone: 44-276-677676

FAX: 44-276-64851

JAPAN

Linear Technology KK

4F Ichihashi Building

1-8-4 Kudankita Chiyoda-Ku

Tokyo, 102 Japan

Phone: 81-3-3237-7891

FAX: 81-3-3237-8010

World Headquarters

Linear Technology Corporation

1630 McCarthy Blvd.

Milpitas, CA 95035-7487

Phone: (408) 432-1900

FAX: (408) 434-0507

07/10/92

LT/GP 0792 10K REV 0

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7487

20

●

(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977

LINEAR TECHNOLOGY CORPORATION 1992


型号：	LT1128CS8
厂家：	Linear
描述：	Ultra Low Noise Precision High Speed Op Amps 超低噪声精密高速运算放大器运算放大器光电二极管
文件：	总20页 (文件大小：439K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT1128CS8 [Linear]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E