LT1800CS5#PBF_技术文档

LT1800

80MHz, 25V/µs Low Power

Rail-to-Rail Input and Output

Precision Op Amp

U

FEATURES

DESCRIPTIO

The LT^®1800 is a low power, high speed rail-to-rail input

and output operational amplifier with excellent DC perfor-

mance.TheLT1800featuresreducedsupplycurrent,lower

input offset voltage, lower input bias current and higher

DC gain than other devices with comparable bandwidth.

■

Gain Bandwidth Product: 80MHz

■

Input Common Mode Range Includes Both Rails

■

Output Swings Rail-to-Rail

■

Low Quiescent Current: 2mA Max

■

Input Offset Voltage: 350µV Max

■

Input Bias Current: 250nA Max

The LT1800 has an input range that includes both supply

rails and an output that swings within 20mV of either sup-

plyrailtomaximizethesignaldynamicrangeinlowsupply

applications.

■

Low Voltage Noise: 8.5nV/√Hz

■

Slew Rate: 25V/µs

■

Common Mode Rejection: 105dB

■

Power Supply Rejection: 97dB

■

The LT1800 maintains its performance for supplies from

2.3V to 12.6V and is specified at 3V, 5V and ±5V supplies.

The inputs can be driven beyond the supplies without

damage or phase reversal of the output.

Open-Loop Gain: 85V/mV

■

Available in the 8-Pin SO and 5-Pin Low Profile

(1mm) ThinSOT^TMPackages

■

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

The LT1800 is available in the 8-pin SO package with the

standard op amp pinout and in the 5-pin SOT-23 package.

FordualandquadversionsoftheLT1800,seetheLT1801/

LT1802 data sheet. The LT1800 can be used as a plug-in

replacement for many op amps to improve input/output

range and performance.

U

APPLICATIO S

■

Low Voltage, High Frequency Signal Processing

Driving A/D Converters

Rail-to-Rail Buffer Amplifiers

■

Active Filters

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

ThinSOT is a trademark of Linear Technology Corporation.

■

Video Line Driver

U

TYPICAL APPLICATIO

Laser Driver Amplifier

500mA Pulse Response

Single Supply 1A Laser Driver Amplifier

5V

+

V

IN

R3

10

DO NOT FLOAT

Q1

ZETEX

FMMT619

Ω

100mA/DIV

LT1800

–

C1

39pF

IR LASER

INFINEON

SFH495

R2

330

R1

Ω

1Ω

1800 TA01

50ns/DIV

1800 TA02

1800f

1

LT1800

W W

U W

ABSOLUTE AXI U RATI GS

(Note 1)

Total Supply Voltage (V_S^–to V_S) ......................... 12.6V

Input Current (Note 2) ........................................ ±10mA

Output Short-Circuit Duration (Note 3)............ Indefinite

Operating Temperature Range (Note 4) .. –40°C to 85°C

Specified Temperature Range (Note 5)... –40°C to 85°C

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

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

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

+

U W

U

PACKAGE/ORDER I FOR ATIO

ORDER PART

NUMBER

ORDER PART

TOP VIEW

NUMBER

TOP VIEW

NC

1

2

3

4

8

7

6

5

NC

+

–

+

V

1

2

5 V

S

+

LT1800CS8

LT1800IS8

OUT

–

LT1800CS5

LT1800IS5

–IN

V

S

V

S

+

–

+IN

–

OUT

+IN 3

4 –IN

V

S

NC

S8 PART MARKING

S5 PART MARKING

S5 PACKAGE

5-LEAD PLASTIC SOT-23

S8 PACKAGE

8-LEAD PLASTIC SO

1800

1800I

LTRN

LTRP

T_JMAX= 150°C, θ_JA= 250°C/ W

T_JMAX= 150°C, θ_JA= 190°C/ W

Consult LTC Marketing 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_OUT= half supply, unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

OS

Input Offset Voltage

V

CM

V

CM

V

CM

V

CM

= 0V

75

300

0.5

0.7

350

750

3

µV

mV

= 0V (SOT-23)

= V

S

= V (SOT-23)

3.5

S

∆V

Input Offset Shift

Input Bias Current

V

= 0V to V – 1.5V

20

180

µV

OS

CM

S

I

V

CM

V

CM

= 1V

25

500

250

1500

nA

B

= V

S

I

Input Offset Current

V

CM

V

CM

= 1V

25

200

nA

OS

= V

S

Input Noise Voltage

0.1Hz to 10Hz

f = 10kHz

1.4

8.5

1

µV

P-P

e

n

Input Noise Voltage Density

Input Noise Current Density

Input Capacitance

nV/√Hz

pA/√Hz

pF

i

f = 10kHz

n

C

A

f = 100kHz

2

IN

Large-Signal Voltage Gain

V = 5V, V = 0.5V to 4.5V, R = 1k at V /2

35

3.5

30

85

8

85

V/mV

VOL

S

O

L

S

V = 5V, V = 1V to 4V, R = 100Ω at V /2

S

O

L

S

V = 3V, V = 0.5V to 2.5V, R = 1k at V /2

S

O

L

S

CMRR

PSRR

Common Mode Rejection Ratio

V = 5V, V = 0V to 3.5V

85

78

105

97

dB

S

CM

V = 3V, V = 0V to 1.5V

S

CM

Input Common Mode Range

Power Supply Rejection Ratio

Minimum Supply Voltage (Note 6)

0

V

dB

V

S

V = 2.5V to 10V, V = 0V

80

97

S

CM

2.3

2.5

1800f

2

LT1800

ELECTRICAL CHARACTERISTICS

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

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

Output Voltage Swing Low (Note 7)

Output Voltage Swing High (Note 7)

Short-Circuit Current

No Load

12

80

50

mV

OL

I

= 5mA

160

450

SINK

= 20mA

225

V

OH

No Load

16

120

450

60

250

750

mV

I

= 5mA

SOURCE

= 20mA

I

V = 5V

20

45

40

mA

SC

S

V = 3V

S

Supply Current per Amplifier

Gain Bandwidth Product

Slew Rate

1.6

80

2

mA

MHz

V/µs

MHz

dBc

ns

S

GBW

SR

Frequency = 2MHz

40

13

V = 5V, A = –1, R = 1k, V = 4V

S

25

V

L

O

FPBW

HD

Full Power Bandwidth

Harmonic Distortion

Settling Time

V = 5V, V

S

= 4V

2

OUT

P-P

V = 5V, A = 1, R = 1k, V = 2V , f = 500kHz

S

–75

250

0.35

0.4

V

L

O

P-P C

t

0.01%, V = 5V, V

= 2V, A = 1, R = 1k

S

STEP V L

∆G

Differential Gain (NTSC)

Differential Phase (NTSC)

V = 5V, A = +2, R = 150Ω

S

%

V

L

∆θ

V = 5V, A = +2, R = 150Ω

S

Deg

V

L

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_OUT= half supply, unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

Input Offset Voltage

V

= 0V

●

125

300

0.6

500

1250

3.5

µV

mV

OS

CM

= 0V (SOT-23)

= V

S

= V (SOT-23)

0.7

3.75

S

∆V

Input Offset Shift

V

= 0V to V – 1.5V

●

30

275

5

µV

OS

CM

S

V

TC

Input Offset Voltage Drift (Note 8)

Input Bias Current

1.5

µV/°C

OS

I

V

= 1V

●

50

550

300

1750

nA

B

CM

= V – 0.2V

S

I

Input Offset Current

V

= 1V

●

25

250

nA

OS

CM

= V – 0.2V

S

A

Large-Signal Voltage Gain

V = 5V, V = 0.5V to 4.5V, R = 1k at V /2

●

30

3

25

75

6

75

V/mV

VOL

S

O

L

S

V = 5V, V = 1V to 4V, R = 100Ω at V /2

S

O

L

S

V = 3V, V = 0.5V to 2.5V, R = 1k at V /2

S

O

L

S

CMRR

PSRR

Common Mode Rejection Ratio

V = 5V, V = 0V to 3.5V

●

82

74

101

93

dB

S

CM

V = 3V, V = 0V to 1.5V

S

CM

Input Common Mode Range

●

0

V

dB

V

S

Power Supply Rejection Ratio

Minimum Supply Voltage (Note 6)

Output Voltage Swing Low (Note 7)

V = 2.5V to 10V, V = 0V

74

91

S

CM

2.3

2.5

V

No Load

●

14

100

300

60

200

550

mV

OL

OH

I

= 5mA

= 20mA

SINK

Output Voltage Swing High (Note 7)

Short-Circuit Current

No Load

●

25

150

600

80

300

950

mV

I

= 5mA

SOURCE

= 20mA

SOURCE

I

V = 5V

●

20

40

30

mA

SC

S

V = 3V

S

Supply Current per Amplifier

Gain Bandwidth Product

Slew Rate

●

2

2.75

mA

MHz

V/µs

1800f

S

GBW

SR

Frequency = 2MHz

V = 5V, A = –1, R = 1k, V = 4V

P-P

35

11

75

22

S

V

L

O

3

LT1800

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_OUT= half supply, unless otherwise noted. (Note 5)

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

Input Offset Voltage

V

= 0V

●

175

400

0.75

0.9

700

2000

4

µV

mV

OS

CM

= 0V (SOT-23)

= V

S

= V (SOT-23)

4

S

∆V

Input Offset Shift

V

= 0V to V – 1.5V

●

30

300

5

µV

OS

CM

S

V

TC

Input Offset Voltage Drift (Note 8)

Input Bias Current

1.5

µV/°C

OS

I

V

= 1V

●

50

600

400

2000

nA

B

CM

= V – 0.2V

S

I

Input Offset Current

V

= 1V

●

25

300

nA

OS

CM

= V – 0.2V

S

A

Large-Signal Voltage Gain

V = 5V, V = 0.5V to 4.5V, R = 1k at V /2

●

25

2.5

20

65

6

65

V/mV

VOL

S

O

L

S

V = 5V, V = 1.5V to 3.5V, R = 100Ω at V /2

S

O

L

S

V = 3V, V = 0.5V to 2.5V, R = 1k at V /2

S

O

L

S

CMRR

PSRR

Common Mode Rejection Ratio

V = 5V, V = 0V to 3.5V

●

81

73

101

93

dB

S

CM

V = 3V, V = 0V to 1.5V

S

CM

Input Common Mode Range

●

0

V

dB

V

S

Power Supply Rejection Ratio

Minimum Supply Voltage (Note 6)

Output Voltage Swing Low (Note 7)

V = 2.5V to 10V, V = 0V

73

90

S

CM

2.3

2.5

V

No Load

●

15

105

170

70

210

400

mV

OL

OH

I

= 5mA

= 10mA

SINK

Output Voltage Swing High (Note 7)

Short-Circuit Current

No Load

●

25

150

300

90

350

700

mV

I

= 5mA

SOURCE

= 10mA

I

V = 5V

●

12.5

30

mA

SC

S

V = 3V

S

Supply Current per Amplifier

Gain Bandwidth Product

Slew Rate

●

2.1

70

18

3

mA

MHz

V/µs

S

GBW

SR

Frequency = 2MHz

V = 5V, A = –1, R = 1k, V = 4V

30

10

S

V

L

O

T_A= 25°C, V_S= ±5V, V_CM= 0V, V_OUT= 0V, unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

–

V

Input Offset Voltage

V

= V

S

150

400

0.7

1

500

1000

3.5

µV

mV

OS

CM

= V (SOT-23)

S

+

= V

S

= V (SOT-23)

4.5

S

–

+

∆V

Input Offset Shift

Input Bias Current

V

= V to V – 1.5V

30

475

µV

OS

CM

S

–

I

V

= V + 1V

25

400

350

1500

nA

B

CM

S

= V

+

S

–

+

I

Input Offset Current

V

= V + 1V

20

250

nA

OS

CM

S

= V

S

Input Noise Voltage

0.1Hz to 10Hz

f = 10kHz

1.4

8.5

1

µV

P-P

e

Input Noise Voltage Density

Input Noise Current Density

Input Capacitance

nV/√Hz

pA/√Hz

pF

n

i

f = 10kHz

n

C

f = 100kHz

2

IN

1800f

4

LT1800

ELECTRICAL CHARACTERISTICS

T_A= 25°C, V_S= ±5V, V_CM= 0V, V_OUT= 0V, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS

V = –4V to 4V, R = 1k

MIN

TYP

MAX

UNITS

A

VOL

Large-Signal Voltage Gain

25

2.5

70

7

V/mV

O

L

V = –2V to 2V, R = 100Ω

O

L

–

CMRR

Common Mode Rejection Ratio

Input Common Mode Range

V

= V to 3.5V

85

109

dB

V

CM

S

–

+

V

S

+

–

PSRR

Power Supply Rejection Ratio

Output Voltage Swing Low (Note 7)

= 2.5V to 10V, V = 0V

80

97

dB

S

V

No Load

15

85

225

60

170

450

mV

OL

I

= 5mA

= 20mA

SINK

Output Voltage Swing High (Note 7)

No Load

17

130

450

70

260

750

mV

OH

I

= 5mA

= 20mA

SOURCE

I

Short-Circuit Current

Supply Current per Amplifier

Gain Bandwidth Product

Slew Rate

30

50

1.8

70

mA

SC

2.75

S

GBW

SR

Frequency = 2MHz

A = –1, R = 1k, V = ±4V, Measured at V = ±2V

MHz

V/µs

MHz

dBc

ns

23

V

L

O

FPBW

HD

Full Power Bandwidth

Harmonic Distortion

Settling Time

V = 8V

0.9

–75

300

0.35

0.2

O

P-P

A = 1, R = 1k, V = 2V , f = 500kHz

V

L

O

P-P C

t

0.01%, V = 5V, A = 1V, R = 1k

STEP V L

S

∆G

Differential Gain (NTSC)

Differential Phase (NTSC)

A = +2, R = 150Ω

%

V

L

∆θ

A = +2, R = 150Ω

Deg

V

L

The ● denotes the specifications which apply over the temperature range of 0°C ≤ T_A≤ 70°C. V_S= ±5V, V_CM= 0V, V_OUT= 0V, unless

otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

–

V

Input Offset Voltage

V

= V

S

●

200

450

0.75

1

800

1500

4

µV

mV

OS

CM

= V (SOT-23)

S

+

= V

S

= V (SOT-23)

5

S

–

+

∆V

Input Offset Shift

V

= V to V – 1.5V

●

45

675

5

µV

OS

CM

S

V

TC

Input Offset Voltage Drift (Note 8)

Input Bias Current

1.5

µV/°C

OS

–

I

V

= V + 1V

●

30

450

400

1750

nA

B

CM

S

+

= V – 0.2V

–

+

I

Input Offset Current

V

= V + 1V

●

25

300

nA

OS

CM

S

= V – 0.2V

S

A

Large-Signal Voltage Gain

V = –4V to 4V, R = 1k

●

20

2

55

5

V/mV

VOL

O

L

V = –2V to 2V, R = 100Ω

O

L

–

CMRR

Common Mode Rejection Ratio

Input Common Mode Range

V

= V to 3.5V

●

82

105

dB

V

CM

S

–

+

V

S

V

S

+

–

PSRR

Power Supply Rejection Ratio

Output Voltage Swing Low (Note 7)

V

= 2.5V to 10V, V = 0V

74

91

dB

S

V

No Load

●

17

105

250

70

210

575

mV

OL

OH

I

= 5mA

= 20mA

SINK

Output Voltage Swing High (Note 7)

No Load

●

25

150

600

90

310

975

mV

I

= 5mA

= 20mA

SOURCE

1800f

5

LT1800

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the temperature range

of 0°C ≤ T_A≤ 70°C. V_S= ±5V, V_CM= 0V, V_OUT= 0V, unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

45

MAX

UNITS

mA

I

Short-Circuit Current

Supply Current per Amplifier

Gain Bandwidth Product

Slew Rate

●

25

SC

S

2.4

70

3.5

mA

GBW

SR

Frequency = 2MHz

MHz

V/µs

A = –1, R = 1k, V = ±4V, Measured at V = ±2V

20

V

L

O

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

unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

–

V

Input Offset Voltage

V

= V

S

●

350

500

0.75

1

900

2250

4.5

µV

mV

OS

CM

= V (SOT-23)

S

+

= V

S

= V (SOT-23)

5.5

S

–

+

∆V

Input Offset Shift

V

= V to V – 1.5V

●

50

750

5

µV

OS

CM

S

V

TC

Input Offset Voltage Drift (Note 8)

Input Bias Current

1.5

µV/°C

OS

–

I

V

= V + 1V

●

50

450

2000

nA

B

CM

S

+

= V – 0.2V

–

+

I

Input Offset Current

V

= V + 1V

●

25

350

nA

OS

CM

S

= V – 0.2V

S

A

Large-Signal Voltage Gain

V = –4V to 4V, R = 1k

●

16

2

55

5

V/mV

VOL

O

L

V = –1V to 1V, R = 100Ω

O

L

–

CMRR

Common Mode Rejection Ratio

Input Common Mode Range

V

= V to 3.5V

●

81

104

dB

V

CM

S

–

+

V

S

V

S

+

–

PSRR

Power Supply Rejection Ratio

Output Voltage Swing Low (Note 7)

V

= 2.5V to 10V, V = 0V

73

90

dB

S

V

No Load

●

15

105

170

80

220

400

mV

OL

OH

I

= 5mA

= 10mA

SINK

Output Voltage Swing High (Note 7)

No Load

●

25

150

300

100

350

700

mV

I

= 5mA

= 10mA

SOURCE

I

Short-Circuit Current

Supply Current per Amplifier

Gain Bandwidth Product

Slew Rate

●

12.5

30

2.6

65

15

mA

SC

4

S

GBW

SR

Frequency = 2MHz

A = –1, R = 1k, V = ±4V, Measured at V = ±2V

MHz

V/µs

V

L

O

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

of the device may be impaired.

Note 2: The inputs are protected by back-to-back diodes and by ESD

diodes to the supply rails. If the differential input voltage exceeds 1.4V or

either input goes outside the rails, the input current should be limited to

less than 10mA.

Note 3: A heat sink may be required to keep the junction temperature

below the absolute maximum rating when the output is shorted

indefinitely.

Note 5: The LT1800C is guaranteed to meet specified performance from

0°C to 70°C. The LT1800C is designed, characterized and expected to

meet specified performance from –40°C to 85°C but is not tested or QA

sampled at these temperatures. The LT1800I is guaranteed to meet

specified performance from –40°C to 85°C.

Note 6: Minimum supply voltage is guaranteed by power supply rejection

ratio test.

Note 7: Output voltage swings are measured between the output and

power supply rails.

Note 4: The LT1800C/LT1800I are guaranteed functional over the

temperature range of –40°C to 85°C.

Note 8: This parameter is not 100% tested.

1800f

6

LT1800

U W

TYPICAL PERFOR A CE CHARACTERISTICS

V_OSDistribution, V_CM= 0V

(SO-8, PNP Stage)

V_OSDistribution, V_CM= 5V

(SO-8, NPN Stage)

V_OSDistribution, V_CM= 0V

(SOT-23, PNP Stage)

45

40

35

30

25

20

15

10

5

45

40

35

30

25

20

15

10

5

40

35

30

25

20

15

10

5

V

= 5V, 0V

CM

V

= 5V, 0V

CM

S

V

= 5V, 0V

CM

S

= 0V

= 5V

= 0V

0

–250

–150

–50

250

–2000 –1200

–400

2000

–1250 –750

–250

250

750

1250

50

150

400

1200

INPUT OFFSET VOLTAGE (µV)

1800 G01

1800 G02

1800 G38

V

_OSDistribution, V_CM= 5V

Offset Voltage

vs Input Common Mode Voltage

(SOT-23, NPN Stage)

Supply Current vs Supply Voltage

500

400

35

30

4

3

2

1

0

V

= 5V, 0V

V

= 5V, 0V

CM

S

T

= –55°C

A

TYPICAL PART

= 5V

300

T

= 125°C

A

T

A

25

200

T

= 25°C

A

100

20

15

10

5

= 25°C

A

0

–100

–200

–300

–400

–500

T

= –55°C

T

= 125°C

A

0

–2500 –1500 –500

500

1500

2500

0

1

2

3

4

5

6

7

8

9

10 11 12

0

1

2

3

4

5

INPUT OFFSET VOLTAGE (µV)

TOTAL SUPPLY VOLTAGE (V)

INPUT COMMON MODE VOLTAGE (V)

1800 G39

1800 G03

1800 G04

Input Bias Current

vs Common Mode Voltage

Input Bias Current

vs Temperature

Output Saturation Voltage

vs Load Current (Output Low)

10

1

0.8

1.0

0.8

V

= 5V, 0V

V

= 5V, 0V

S

T

A

T

A

T

A

= 25°C

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

= 125°C

= –55°C

NPN ACTIVE

0.6

V

= 5V, 0V

CM

S

0.4

V

= 5V

0.2

0.1

0

T

= 125°C

–0.2

–0.4

–0.6

–0.8

–1.0

A

PNP ACTIVE

= 5V, 0V

0.01

0.001

V

S

CM

T

= 25°C

T

= –55°C

A

V

= 1V

–0.1

0.01

0.1

1

10

100

0

1

2

3

4

5

6

–60 –40 –20

0

20

40

60

80

–1

LOAD CURRENT (mA)

TEMPERATURE (°C)

INPUT COMMON MODE VOLTAGE (V)

1800 G07

1800 G06

1800 G05

1800f

7

LT1800

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Output Saturation Voltage

vs Load Current (Output High)

Output Short-Circuit Current

vs Power Supply Voltage

Minimum Supply Voltage

70

60

50

40

30

10

1

0.6

0.4

T

= 25°C

V

= 5V, 0V

A

S

T

A

= –55°C

= 125°C

A

0.2

T

= –55°C

SINKING

= 5V, 0V

A

20

T

= 25°C

10

0

A

V

S

0.1

0

T

= 125°C

= –55°C

A

–10

–20

–30

–40

–50

–60

–70

T

= –55°C

= 125°C

SOURCING

A

–0.2

T

A

= 125°C

T

0.01

0.001

A

T

= 25°C

T

A

–0.4

–0.6

T

= 25°C

A

1.5

2

2.5

3

3.5

4

4.5

5

0

1.5

2

2.5

3

3.5

4

4.5

5

5.5

0.01

0.1

1

10

100

POWER SUPPLY VOLTAGE (±V)

LOAD CURRENT (mA)

TOTAL SUPPLY VOLTAGE (V)

1800 G08

1800 G09

1800 G10

Open-Loop Gain

2000

1600

1200

800

2000

1600

1200

800

2000

1600

1200

800

V

= 3V, 0V

TO GND

V

= 5V, 0V

TO GND

V = ±5V

S

R TO GND

L

S

L

S

L

R

400

R

L

= 1k

R

= 1k

R

L

= 1k

L

0

–400

–800

–1200

–1600

–2000

–400

–800

–1200

–1600

–2000

–400

–800

–1200

–1600

–2000

R

= 100Ω

L

R

= 100Ω

L

R

= 100Ω

L

0

0.5

1.5

2

2.5

3

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

–5 –4 –3 –2 –1

0

1

2

3

4

5

1

OUTPUT VOLTAGE (V)

1800 G11

1800 G12

1800 G13

Warm-Up Drift vs Time

(LT1800S8)

Input Noise Voltage vs Frequency

Offset Voltage vs Output Current

60

120

110

100

90

2.0

1.5

V = 5V, 0V

S

V

S

= ±5V

V

S

= ±5V

50

40

1.0

T

= –55°C

A

0.5

NPN ACTIVE

= 4.25V

V

= ±2.5V

= ±1.5V

S

30

20

80

0

V

CM

70

–0.5

–1.0

–1.5

–2.0

T

A

= 25°C

T

= 125°C

A

60

V

10

0

PNP ACTIVE

= 2.5V

50

V

CM

TYPICAL PART

40

0.01

0.1

1

FREQUENCY (kHz)

10

100

0

15

20

40

80 100 120 140

–60 –45 –30 –15

30 45 60

0

60

OUTPUT CURRENT (mA)

TIME AFTER POWER-UP (SECONDS)

1800 G16

1800 G14

1800 G15

1800f

8

LT1800

U W

TYPICAL PERFOR A CE CHARACTERISTICS

0.1Hz to 10Hz Output Voltage

Noise

Gain Bandwidth and Phase

Margin vs Supply Voltage

Input Current Noise vs Frequency

3.0

2000

1000

0

100

90

80

70

60

V

S

= 5V, 0V

V

= 5V, 0V

T

= 25°C

S

A

2.5

2.0

GAIN BANDWIDTH

PRODUCT

PNP ACTIVE

= 2.5V

60

50

40

30

20

1.5

1.0

V

CM

PHASE MARGIN

–1000

–2000

NPN ACTIVE

= 4.25V

0.5

0

V

CM

0.01

0.1

1

FREQUENCY (kHz)

10

100

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

TIME (SECONDS)

TOTAL SUPPLY VOLTAGE (V)

1800 G17

1800 G18

1800 G19

Gain Bandwidth and Phase

Margin vs Temperature

Slew Rate vs Temperature

Gain and Phase vs Frequency

70

60

50

40

100

80

100

35

A

= –1

G

= 1k

V

F

L

GBW PRODUCT

= ±2.5V

90

80

70

60

50

R = R = 1k

V

S

V

S

= ±2.5V

PHASE

R

30

25

60

GBW PRODUCT

= ±5V

40

V

S

30

20

0

V

= ±5V

S

GAIN

PHASE MARGIN

= ±2.5V

60

50

40

30

20

10

V

S

10

0

–20

–40

–60

–80

–100

20

15

10

PHASE MARGIN

= ±5V

V

S

–10

–20

–30

V

= ±2.5V

= ±5V

S

0.01

0.1

1

10

100 300

–55 –35 –15

5

25 45 65 85 105 125

–55 –35 –15

5

25 45 65 85 105 125

TEMPERATURE (°C)

FREQUENCY (MHz)

1800 G22

1800 G20

1800 G21

Gain vs Frequency (A_V= 1)

Gain vs Frequency (A_V= 2)

Output Impedance vs Frequency

600

12

9

18

15

12

9

R

C

V

= 1k

= 10pF

= 2

R

C

V

= 1k

= 10pF

= 1

V

S

= ±2.5V

L

100

10

A

6

A

V

= 10

3

V

= ±2.5V

S

A

V

= 1

1

0

6

V

S

= ±2.5V

V

= ±5V

S

A

V

= 2

–3

–6

–9

–12

3

0.1

V

S

= ±5V

0

0.01

–3

–6

0.001

0.1

1

10

100 300

0.1

1

10

100 300

0.1

1

10

FREQUENCY (MHz)

100

500

FREQUENCY (MHz)

1800 G23

1800 G24

1800 G25

1800f

9

LT1800

TYPICAL PERFOR A CE CHARACTERISTICS

U W

Series Output Resistor

vs Capacitive Load

Common Mode Rejection Ratio

vs Frequency

Power Supply Rejection Ratio

vs Frequency

120

60

55

50

45

40

35

30

25

20

15

10

5

90

80

70

60

V

S

= 5V, 0V

V

= 5V, 0V

= 25°C

V

A

= 5V, 0V

= 1

S

A

S

V

T

100

80

NEGATIVE

SUPPLY

POSITIVE

SUPPLY

R

= 10Ω

OS

50

40

60

40

R

= 20Ω

OS

30

20

10

20

0

R

= R = 50Ω

L

OS

0

–10

0.01

0.1

1

10

100

10

100

1000

10000

0.001

0.01

0.1

1

10

100

FREQUENCY (MHz)

CAPACITIVE LOAD (pF)

FREQUENCY (MHz)

1800 G26

1800 G28

1800 G27

Series Output Resistor

vs Capacitive Load

Distortion vs Frequency

60

55

50

45

40

35

30

25

20

15

10

5

–40

–50

–40

–50

V

A

= 5V, 0V

= 2

V

A

V

= 5V, 0V

= 1

V

A

V

= 5V, 0V

= 2

S

V

S

V

S

V

= 2V

OUT

P-P

OUT

P-P

R

= 1k,

L

–60

2ND

R

L

= 150Ω, 2ND

R

L

= 150Ω, 2ND

R

= 1k, 2ND

L

–70

R

L

= 150Ω,

3RD

R

L

= 150Ω, 3RD

R

= 10Ω

OS

–80

R

= 20Ω

OS

–90

–100

R

L

= 1k, 3RD

R

L

= 1k, 3RD

R

= R = 50Ω

L

OS

0

–110

10

100

1000

10000

0.01

0.1

1

10

0.01

0.1

1

10

CAPACITIVE LOAD (pF)

FREQUENCY (MHz)

1800 G29

1800 G30

1800 G31

Maximum Undistorted Output

Signal vs Frequency

5V Small-Signal Response

5V Large-Signal Response

4.6

4.5

4.4

4.3

4.2

4.1

4.0

3.9

50mV/DIV

0V

A

= 2

V

1V/DIV

0V

A

= –1

V

V_S= 5V, 0V

A_V= 1

50ns/DIV

1800 G34

V

= 5V, 0V

= 1k

V_S= 5V, 0V

A_V= 1

100ns/DIV

1800 G33

S

L

R

_L= 1k

R

_L= 1k

1k

10k

100k

FREQUENCY (Hz)

1M

10M

1800 G32

1800f

10

LT1800

U W

TYPICAL PERFOR A CE CHARACTERISTICS

±5V Small-Signal Response

Output Overdriven Recovery

±5V Large-Signal Response

V_IN

1V/DIV

50mV/DIV

0V

2V/DIV

0V

V_OUT

2V/DIV

0V

V_S= ±5V

A_V= 1

R_L= 1k

50ns/DIV

1800 G36

V

_S= 5V, 0V

100ns/DIV

1800 G37

V_S= ±5V

200ns/DIV

1800 G35

A_V= 2

A_V= 1

R_L= 1k

R

_L= 1k

W U U

U

APPLICATIO S I FOR ATIO

Circuit Description

the positive supply. As the input voltage moves closer

toward the positive supply, the transistor Q5 will steer the

tail current I₁to the current mirror Q6/Q7, activating the

NPN differential pair and the PNP pair becomes inactive

for the rest of the input common mode range up to the

positive supply. Also at the input stage, devices Q17 to

Q19 act to cancel the bias current of the PNP input pair.

When Q1-Q2 are active, the current in Q16 is controlled to

be the same as the current in Q1-Q2, thus the base current

The LT1800 has an input and output signal range that

covers from the negative power supply to the positive

power supply. Figure 1 depicts a simplified schematic of

the amplifier. The input stage is comprised of two differ-

entialamplifiers, aPNPstageQ1/Q2andanNPNstageQ3/

Q4 that are active over the different ranges of common

mode input voltage. The PNP differential pair is active

between the negative supply to approximately 1.2V below

+

V

R3

R4

R5

–

+

V

Q12

+

D1

ESDD1

ESDD2

Q11

Q13

Q15

I

2

I

1

C2

+IN

–IN

+

D6

D5

D8

D7

Q5

V

BIAS

I

3

D2

OUT

C

–

V

Q4 Q3

Q1 Q2

D3

BUFFER

AND

OUTPUT BIAS

ESDD4

ESDD3

Q10

–

+

V

D4

Q9

R1

Q8

R2

Q16

C1

Q17

Q18

Q14

Q7

Q6

Q19

–

V

1800 F01

Figure 1. LT1800 Simplified Schematic Diagram

1800f

11

LT1800

W U U

U

APPLICATIO S I FOR ATIO

of Q16 is nominally equal to the base current of the input

devices. The base current of Q16 is then mirrored by

devices Q17-Q19 to cancel the base current of the input

devices Q1-Q2.

the NPN input stage is activated for the remaining input

range up to the positive supply rail during which the PNP

stage remains inactive. The offset voltage is typically less

than 75µV in the range that the PNP input stage is active.

ApairofcomplementarycommonemitterstagesQ14/Q15

that enable the output to swing from rail to rail constructs

the output stage. The capacitors C2 and C3 form the local

feedback loops that lower the output impedance at high

frequency. These devices are fabricated on Linear

Technology’s proprietary high-speed complementary bi-

polar process.

Input Bias Current

The LT1800 employs a patent-pending technique to trim

the input bias current to less than 250nA for the input

commonmodevoltageof0.2Vabovenegativesupplyrail

to 1.2V of the positive rail. The low input offset voltage

and low input bias current of the LT1800 provide the

precision performance especially for high source imped-

ance applications.

Power Dissipation

TheLT1800amplifierisofferedinasmallpackage,SOT-23,

which has a thermal resistance of 250°C/W, θ_JA. So there

is a need to ensure that the die’s junction temperature

should not exceed 150°C. Junction temperature T_Jis

calculated from the ambient temperature T_A, power dissi-

pation P_Dand thermal resistance θ_JA:

Output

The LT1800 can deliver a large output current, so the

short-circuit current limit is set around 50mA to prevent

damage to the device. Attention must be paid to keep the

junction temperature of the IC below the absolute maxi-

mum rating of 150°C (refer to the Power Dissipation

section) when the output is continuously short circuited.

The output of the amplifier has reverse-biased diodes

connected to each supply. If the output is forced beyond

either supply, unlimited current will flow through these

diodes. If the current is transient and limited to several

hundred mA, and the total supply voltage is less than

12.6V, the absolute maximum rating, no damage will

occur to the device.

T_J= T_A+ (P_D• θ_JA)

ThepowerdissipationintheICisthefunctionofthesupply

voltage,outputvoltageandtheloadresistance.Foragiven

supply voltage, the worst-case power dissipation P_DMAX

occurs at the maximum supply current and the output

voltage is at half of either supply voltage (or the maximum

swing is less than 1/2 supply voltage). P_DMAXis given by:

P_DMAX= (V_S• I_SMAX) + (V_S/2)²/R_L

Example: An LT1800 in a SOT-23 package operating on

±5V supplies and driving a 50Ω load, the worst-case

power dissipation is given by:

Overdrive Protection

When the input voltage exceeds the power supplies, two

pairs of crossing diodes D1 to D4 will prevent the output

from reversing polarity. If the input voltage exceeds either

power supply by 700mV, diode D1/D2 or D3/D4 will turn

on to keep the output at the proper polarity. For the phase

reversal protection to perform properly, the input current

must be limited to less than 10mA. If the amplifier is

severelyoverdriven, anexternalresistorshouldbeusedto

limit the overdrive current.

P_DMAX=(10•4mA)+(2.5)²/50=0.04+0.125=0.165W

The maximum ambient temperature that the part is al-

lowed to operate is:

T_A= T_J– (P_DMAX• 250°C/W)

= 150°C – (0.165W • 250°C/W) = 108°C

Input Offset Voltage

The LT1800’s input stages are also protected against a

large differential input voltage of 1.4V or higher by a pair

of back-back diodes D5/D8 to prevent the emitter-base

breakdown of the input transistors. The current in these

Theoffsetvoltagewillchangedependinguponwhichinput

stage is active. The PNP input stage is active from the

negative supply rail to 1.2V of the positive supply rail, then

1800f

12

LT1800

W U U

APPLICATIO S I FOR ATIO

U

diodes should be limited to less than 10mA when they are

active. The worst-case differential input voltage usually

occurs when the input is driven while the output is shorted

to ground in a unity gain configuration. In addition, the

amplifier is protected against ESD strikes up to 3kV on all

pins by a pair of protection diodes on each pin that are

connected to the power supplies as shown in Figure1.

stability. Graphs on capacitive loads indicate the transient

responseoftheamplifierwhendrivingcapacitiveloadwith

a specified series resistor.

Feedback Components

Whenfeedbackresistorsareusedtosetupgain,caremust

be taken to ensure that the pole formed by the feedback

resistors and the total capacitance at the inverting input

does not degrade stability. For instance, the LT1800 in a

noninverting gain of 2, set up with two 5k resistors and a

capacitance of 5pF (part plus PC board) will probably ring

in transient response. The pole is formed at 12.7MHz that

will reduce phase margin by 32 degrees when the cross-

overfrequencyoftheamplifierisaround20MHz.Acapaci-

tor of 5pF or higher connected across the feedback resis-

tor will eliminate any ringing or oscillation.

Capacitive Load

The LT1800 is optimized for high bandwidth, low power

and precision applications. It can drive a capacitive load of

about 75pF in a unity gain configuration, and more for

higher gain. When driving a larger capacitive load, a

resistor of 10Ω to 50Ω should be connected between the

output and the capacitive load to avoid ringing or oscilla-

tion. The feedback should still be taken from the output so

that the resistor will isolate the capacitive load to ensure

W U U

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APPLICATIO S I FOR ATIO

Single Supply 1A Laser Driver Amplifier

Fast 1A Current Sense Amplifier

The circuit in the front page of this data sheet shows the

LT1800 used in a 1A laser driver application. One of the

reasonstheLT1800iswellsuitedtothiscontroltaskisthat

its 2.3V operation ensures that it will be awake during

power-up and operated before the circuit can otherwise

causesignificantcurrenttoflowinthe2.1Vthresholdlaser

diode. Driving the noninverting input of the LT1800 to a

voltage V_INwill control the turning on of the high current

NPN transistor, FMMT619 and the laser diode. A current

equal to V_IN/R1 flows through the laser diode. The LT1800

low offset voltage and low input bias current allows it to

control the current that flows through the laser diode

precisely. The overall circuit is a 1A per Volt V-to-I con-

verter. Frequency compensation components R2 and C1

are selected for fast but zero-overshoot time domain

response to avoid overcurrent conditions in the laser. The

time domain response of this circuit, measured at R1 and

given a 500mV 230ns input pulse, is also shown in the

graphiconthefrontpage. Whilethecircuitiscapableof1A

operation, the laser diode and the transistor are thermally

limitedduetopowerdissipation, sotheymustbeoperated

at low duty cycles.

Asimple,fastcurrentsenseamplifierinFigure2issuitable

for quickly responding to out-of-range currents. The cir-

cuit amplifies the voltage across the 0.1Ω sense resistor

by a gain of 20, resulting in a conversion gain of 2V/A. The

–3dBbandwidthofthecircuitis4MHz,andtheuncertainty

due to V_OSand I_Bis less than 4mA. The minimum output

voltageis60mV,correspondingto30mA.Thelarge-signal

response of the circuit is shown in Figure 3.

I

L

3V

0A TO 1A

52.3Ω

+

–

V

OUT

LT1800

0V TO 2V

0.1

Ω

1k

52.3Ω

1800 F02

V

= 2 • I

= 4MHz

OUT

L

f

–3dB

UNCERTAINTY DUE TO V

I

B

< 4mA

OS,

Figure 2. Fast 1A Current Sense

1800f

13

LT1800

U

TYPICAL APPLICATIO S

Single 3V Supply, 1MHz, 4th Order Butterworth Filter

The circuit shown in Figure 4 makes use of the low voltage

operation and the wide bandwidth of the LT1800 to create

aDCaccurate1MHz4thorderlowpassfilterpoweredfrom

a 3V supply. The amplifiers are configured in the inverting

mode for the lowest distortion and the output can swing

rail-to-rail for maximum dynamic range. Figure 5 displays

the frequency response of the filter. Stopband attenuation

is greater than 100dB at 50MHz. With a 2.25V_P-P, 250kHz

input signal, the filter has harmonic distortion products of

less than –85dBc. Worst case output offset voltage is less

than 6mV.

500mV/DIV

0V

V_S= 3V

50ns/DIV

1800 F03

Figure 3. Current Sense Amplifier Large-Signal Response

47pF

909Ω

3V

909

Ω

2.67k

22pF

1.1k

2.21k

–

V

IN

1.1k

–

220pF

LT1800

+

470pF

V

LT1800

OUT

+

V /2

S

1800 F04

Figure 4. 3V, 1MHz, 4th Order Butterworth Filter

0

–20

–40

–60

–80

–100

–120

1k

10k

100k

1M

10M

100M

FREQUENCY (Hz)

1800 F05

Figure 5. Frequency Response of Filter

1800f

14

LT1800

U

PACKAGE DESCRIPTIO

S6 Package

6-Lead Plastic TSOT-23

(Reference LTC DWG # 05-08-1636)

0.62

MAX

0.95

REF

2.90 BSC

(NOTE 4)

1.22 REF

1.50 – 1.75

(NOTE 4)

2.80 BSC

1.4 MIN

3.85 MAX 2.62 REF

PIN ONE

RECOMMENDED SOLDER PAD LAYOUT

PER IPC CALCULATOR

0.30 – 0.45 TYP

5 PLCS (NOTE 3)

0.95 BSC

0.80 – 0.90

0.20 BSC

DATUM ‘A’

0.01 – 0.10

1.00 MAX

0.30 – 0.50 REF

1.90 BSC

0.09 – 0.20

(NOTE 3)

NOTE:

S5 TSOT-23 0302

1. DIMENSIONS ARE IN MILLIMETERS

2. DRAWING NOT TO SCALE

3. DIMENSIONS ARE INCLUSIVE OF PLATING

4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

5. MOLD FLASH SHALL NOT EXCEED 0.254mm

6. JEDEC PACKAGE REFERENCE IS MO-193

S8 Package

8-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference 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)

TYP

*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

SO8 1298

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD

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

1

3

4

2

1800f

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.

15

LT1800

U

TYPICAL APPLICATIO

precise DC output voltage. When no signal is present, the

op amp output sits at about mid-supply. Transistors Q1

and Q3 create bias voltages for Q2 and Q4, which are

forced into a low quiescent current by degeneration resis-

tors R4 and R5. When a transient signal arrives at V_IN, the

op amp output moves and causes the current in Q2 or Q4

to change depending on the signal polarity. The current,

limited by the clipping of the LT1800 output and the 3kΩ

of total emitter degeneration, is mirrored to the output

devices to drive the capacitive load. The LT1800 output

then returns to near mid-supply, providing the precise DC

outputvoltagetotheload. Theattentiontolimitthecurrent

of the output devices minimizes power dissipation thus

allowing for dense layout, and inherits better reliability.

Figure 7 shows the time domain response of the amplifier

providing a 200V output swing into a 100pF load.

Low Power High Voltage Amplifier

Certain materials used in optical applications have charac-

teristics that change due to the presence and strength of

a DC electric field. The voltage applied across these

materials should be precisely controlled to maintain de-

sired properties, sometimes as high as 100’s of volts. The

materials are not conductive and represent a capacitive

load.

The circuit of Figure 6 shows the LT1800 used in an

amplifier capable of a 250V output swing and providing

130V

5V

10k

4.99k

1k

Q6

Q5

0.1µF

Q2

Q1

5V

R4

2k

R6

2k

+

R2

2k

V

OUT

MATERIAL UNDER

LT1800

–

R5

2k

R7

2k

V_IN

2V/DIV

ELECTRIC FIELD

100pF

Q3

Q4

V

IN

R1

2k

V_OUT

50V/DIV

A

V

= V /V = –100

OUT IN

C1

39pF

10k

±130V SUPPLY I = 130µA

OUTPUT SWING = ±128.8V

OUTPUT OFFSET 20mV

OUTPUT SHORT-CIRCUIT CURRENT 3mA

10% TO 90% RISE TIME 8µs, 200V OUTPUT STEP

SMALL-SIGNAL BANDWIDTH 150kHz

Q1, Q2, Q7, Q8: ON SEMI MPSA42

Q

Q7

Q8

1k

C2

R3

200k

8pF

4.99k

150V

–130V

10µs/DIV

1800 F07

Q3, Q4, Q5, Q6: ON SEMI MPSA92

1800 F06

Figure 7. Large-Signal Time Domain

Response of the Amplifier

Figure 6. Low Power, High Voltage Amplifier

RELATED PARTS

PART NUMBER DESCRIPTION

COMMENTS

0.1dB Gain Flatness to 150MHz, Shutdown

High DC Accuracy, 475µV V , 4µV/°C Max Drift,

LT1399

Triple 300MHz Current Feedback Amplifier

LT1498/LT1499 Dual/Quad 10MHz, 6Vµs Rail-to-Rail Input and Output C-Load^TM

OS(MAX)

Op Amps

Max Supply Current 2.2mA per Amp

LT1630/LT1631 Dual/Quad 30MHz, 10V/µs Rail-to-Rail Input and Output Op Amps

High DC Accuracy, 525µV V , 70mA Output Current,

OS(MAX)

Max Supply Current 4.4mA per Amplifier

LT1801/LT1802 80MHz, 25V/µs Low Power Rail-to-Rail Input/Output Precision Op Amps Dual/Quad Version of the LT1800

LT1806/LT1807 Single/Dual 325MHz, 140V/µs Rail-to-Rail Input and Output Op Amps

LT1809/LT1810 Single/Dual 180MHz Rail-to-Rail Input/Output Op Amps

C-Load is a trademark of Linear Technology Corporation.

High DC Accuracy, 550µV V

, Low Noise 3.5nV/√Hz,

OS(MAX)

Low Distortion –80dB at 5MHz, Power-Down (LT1806)

350V/µs Slew Rate, Low Distortion –90dBc at 5MHz,

Power-Down (LT1809)

1800f

LT/TP 0402 2K • PRINTED IN USA

16 ^{LinearTechnology Corporation}

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

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

LINEAR TECHNOLOGY CORPORATION 2001


型号：	LT1800CS5#PBF
厂家：	Linear
描述：	LT1800 - 80MHz, 25V/µs Low Power Rail-to-Rail Input and Output Precision Op Amp; Package: SOT; Pins: 5; Temperature Range: 0°C to 70°C 运算放大器放大器电路光电二极管
文件：	总16页 (文件大小：267K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT1800CS5#PBF [Linear]

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