LT1352CN8_技术文档

LT1352/LT1353

Dual and Quad

250µA, 3MHz, 200V/µs

Operational Amplifiers

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FEATURES

DESCRIPTION

The LT^®1352/LT1353 are dual and quad, very low power,

highspeedoperationalamplifierswithoutstandingACand

DC performance. The amplifiers feature much lower sup-

ply current and higher slew rate than devices with compa-

rable bandwidth. The circuit combines the slewing perfor-

mance of a current feedback amplifier in a true operational

amplifier with matched high impedance inputs. The high

slew rate ensures that the large-signal bandwidth is not

degraded. Each output is capable of driving a 1kΩ load to

±13V with ±15V supplies and a 500Ω load to ±3.4V on

±5V supplies.

■

3MHz Gain Bandwidth

■

200V/µs Slew Rate

■

250µA Supply Current per Amplifier

C-Load^TMOp Amp Drives All Capacitive Loads

■

Unity-Gain Stable

Maximum Input Offset Voltage: 600µV

■

Maximum Input Bias Current: 50nA

■

Maximum Input Offset Current: 15nA

■

Minimum DC Gain, R_L= 2k: 30V/mV

■

Input Noise Voltage: 14nV/√Hz

■

Settling Time to 0.1%, 10V Step: 700ns

■

Settling Time to 0.01%, 10V Step: 1.25µs

The LT1352/LT1353 are members of a family of fast, high

performance amplifiers using this unique topology and

employing Linear Technology Corporation’s advanced

complementary bipolar processing. For higher bandwidth

deviceswithhighersupplycurrentseetheLT1354through

LT1365datasheets.Bandwidthsof12MHz,25MHz,50MHz

and 70MHz are available with 1mA, 2mA, 4mA and 6mA of

supply current per amplifier. Singles, duals and quads of

each amplifier are available.

■

Minimum Output Swing into 1k: ±13V

■

Minimum Output Swing into 500Ω: ±3.4V

■

Specified at ±2.5V, ±5V and ±15V

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APPLICATIONS

■

Battery-Powered Systems

Wideband Amplifiers

Buffers

Active Filters

Data Acquisition Systems

Photodiode Amplifiers

■

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

C-Load is a trademark of Linear Technology Corporation.

■

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TYPICAL APPLICATION

Instrumentation Amplifier

Large-Signal Response

R1

50k

R2

5k

R5

1.1k

R4

50k

R3

5k

–

1/2

LT1352

–

1/2

LT1352

+

V

+

–

IN

OUT

V

+

GAIN = [R4/R3][1 + (1/2)(R2/R1 + R3/R4) + (R2 + R3)/R5] = 102

TRIM R5 FOR GAIN

TRIM R1 FOR COMMON MODE REJECTION

BW = 30kHz

A_V= –1

1352/53 TA02

1352/53 TA01

1

LT1352/LT1353

W W U W

ABSOLUTE MAXIMUM RATINGS

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

Differential Input Voltage ....................................... ±10V

Input Voltage .......................................................... ±V_S

Output Short-Circuit Duration (Note 1) ........... Indefinite

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

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

Maximum Junction Temperature (See Below)

Plastic Package ............................................... 150°C

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

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

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PACKAGE/ORDER INFORMATION

TOP VIEW

ORDER PART

TOP VIEW

NUMBER

OUT A

–IN A

+IN A

1

2

3

4

5

6

7

14

13

12

11

10

9

OUT D

–IN D

+IN D

+

OUT A

–IN A

+IN A

1

2

3

4

8

7

6

5

V

OUT B

–IN B

+IN B

A

B

D

C

A

LT1352CN8

LT1352CS8

LT1353CS

+

–

B

V

–

V

+IN B

–IN B

OUT B

+IN C

–IN C

OUT C

N8 PACKAGE

8-LEAD PDIP

S8 PART MARKING

1352

8

S8 PACKAGE

8-LEAD PLASTIC SO

S PACKAGE

14-LEAD PLASTIC SO

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= 150°C/ W

Consult factory for Industrial and Military grade parts.

T_A= 25°C, V_CM= 0V unless otherwise noted.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

V

MIN

TYP

MAX

UNITS

SUPPLY

V

Input Offset Voltage

±15V

±5V

±2.5V

0.2

0.3

0.6

0.8

mV

OS

I

Input Offset Current

Input Bias Current

Input Noise Voltage

Input Noise Current

Input Resistance

±2.5V to ±15V

5

15

50

nA

OS

20

14

0.5

B

e

f = 10kHz

nV/√Hz

pA/√Hz

n

i

n

R

V

= ±12V

CM

±15V

300

600

20

MΩ

IN

Differential

C

Input Capacitance

±15V

3

pF

IN

Positive Input Voltage Range

±15V

±5V

±2.5V

12.0

2.5

0.5

13.5

3.5

1.0

V

Negative Input Voltage Range

Common Mode Rejection Ratio

Power Supply Rejection Ratio

±15V

±5V

±2.5V

–13.5 –12.0

V

–3.5

–1.0

–2.5

–0.5

CMRR

PSRR

V

= ±12V

= ±2.5V

= ±0.5V

±15V

±5V

±2.5V

80

78

68

94

86

77

dB

CM

V = ±2.5V to ±15V

90

106

dB

S

2

LT1352/LT1353

ELECTRICAL CHARACTERISTICS ^T_A^{= 25°C, V}_CM= 0V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

V

MIN

TYP

MAX

UNITS

SUPPLY

A

VOL

Large-Signal Voltage Gain

V

OUT

V

OUT

V

OUT

V

OUT

V

OUT

V

OUT

V

OUT

= ±12V, R = 5k

±15V

±5V

40

30

20

30

25

15

20

80

60

40

60

50

30

40

V/mV

L

= ±10V, R = 2k

L

= ±10V, R = 1k

L

= ±2.5V, R = 5k

L

= ±2.5V, R = 2k

L

= ±2.5V, R = 1k

L

= ±1V, R = 5k

±2.5V

L

V

Output Swing

Output Current

R = 5k, V = ±10mV

±15V

±5V

±2.5V

13.5

13.4

13.0

3.5

3.4

1.3

14.0

13.8

13.4

4.0

3.8

1.7

±V

OUT

L

IN

R = 2k, V = ±10mV

L

IN

R = 1k, V = ±10mV

L

IN

R = 1k, V = ±10mV

L

IN

R = 500Ω, V = ±10mV

L

IN

R = 5k, V = ±10mV

L

IN

I

V

OUT

V

OUT

= ±13V

= ±3.4V

±15V

±5V

13.0

6.8

13.4

7.6

mA

OUT

SC

Short-Circuit Current

Slew Rate

V

OUT

= 0V, V = ±3V

±15V

30

45

mA

IN

SR

A = –1, R = 5k (Note 2)

±15V

±5V

120

30

200

50

V/µs

V

L

Full-Power Bandwidth

Gain Bandwidth

10V Peak (Note 3)

3V Peak (Note 3)

±15V

±5V

3.2

2.6

MHz

GBW

f = 200kHz, R = 10k

±15V

± 5V

± 2.5V

2.0

1.8

3.0

2.7

2.5

MHz

L

t , t

r

Rise Time, Fall Time

Overshoot

A = 1, 10% to 90%, 0.1V

±15V

±5V

46

53

ns

f

V

A = 1, 0.1V

V

±15V

±5V

13

16

%

Propagation Delay

Settling Time

50% V to 50% V , 0.1V

±15V

±5V

41

52

ns

IN

OUT

t

10V Step, 0.1%, A = –1

±15V

±5V

700

1250

950

ns

s

V

10V Step, 0.01%, A = –1

V

5V Step, 0.1%, A = –1

V

5V Step, 0.01%, A = –1

±5V

1400

V

R

Output Resistance

Channel Separation

Supply Current

A = 1, f = 20kHz

±15V

1.5

Ω

O

V

OUT

= ±10V, R = 2k

101

120

dB

L

I

Each Amplifier

±15V

±5V

250

230

320

300

µA

S

0°C ≤ T_A≤ 70°C, V_CM= 0V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

V

MIN

TYP

MAX

UNITS

SUPPLY

V

OS

Input Offset Voltage

±15V

±5V

±2.5V

0.8

1.0

mV

Input V Drift

(Note 4)

±2.5V to ±15V

3

8

µV/°C

nA

OS

I

Input Offset Current

Input Bias Current

20

75

OS

nA

B

3

LT1352/LT1353

0°C ≤ T_A≤ 70°C, V_CM= 0V unless otherwise noted.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

V

MIN

TYP

MAX

UNITS

SUPPLY

CMRR

Common Mode Rejection Ratio

V

CM

V

CM

V

CM

= ±12V

= ±2.5V

= ±0.5V

±15V

±5V

±2.5V

78

77

67

dB

PSRR

Power Supply Rejection Ratio

Large-Signal Voltage Gain

V = ±2.5V to ±15V

89

dB

S

A

V

OUT

V

OUT

V

OUT

V

OUT

V

OUT

V

OUT

= ±12V, R = 5k

±15V

±5V

25

20

15

10

15

V/mV

VOL

OUT

L

= ±10V, R = 2k

L

= ±2.5V, R = 5k

L

= ±2.5V, R = 2k

L

= ±2.5V, R = 1k

L

= ±1V, R = 5k

±2.5V

L

V

Output Swing

Output Current

R = 5k, V = ±10mV

±15V

±5V

±2.5V

13.4

13.3

12.0

3.4

3.3

1.2

±V

L

IN

R = 2k, V = ±10mV

L

IN

R = 1k, V = ±10mV

L

IN

R = 1k, V = ±10mV

L

IN

R = 500Ω, V = ±10mV

L

IN

R = 5k, V = ±10mV

L

IN

I

V

OUT

V

OUT

= ±12V

= ±3.3V

±15V

±5V

12.0

6.6

mA

OUT

SC

Short-Circuit Current

Slew Rate

V

OUT

= 0V, V = ±3V

±15V

24

mA

IN

SR

A = –1, R = 5k (Note 2)

±15V

±5V

100

21

V/µs

V

L

GBW

Gain Bandwidth

f = 200kHz, R = 10k

±15V

± 5V

1.8

1.6

MHz

L

Channel Separation

Supply Current

V

= ±10V, R = 2k

±15V

100

dB

OUT

L

I

Each Amplifier

±15V

±5V

350

330

µA

S

–40°C ≤ T_A≤ 85°C, V_CM= 0V unless otherwise noted (Note 5).

SYMBOL

PARAMETER

CONDITIONS

V

MIN

TYP

MAX

UNITS

SUPPLY

V

Input Offset Voltage

±15V

±5V

±2.5V

1.0

1.2

mV

OS

Input V Drift

(Note 4)

±2.5V to ±15V

3

8

µV/°C

nA

OS

I

Input Offset Current

30

OS

Input Bias Current

100

nA

B

CMRR

Common Mode Rejection Ratio

V

= ±12V

= ±2.5V

= ±0.5V

±15V

±5V

±2.5V

76

66

dB

CM

PSRR

Power Supply Rejection Ratio

Large-Signal Voltage Gain

V = ±2.5V to ±15V

87

dB

S

A

V

= ±12V, R = 5k

±15V

±5V

20

15

10

8

V/mV

VOL

OUT

L

= ±10V, R = 2k

L

= ±2.5V, R = 5k

L

= ±2.5V, R = 2k

L

= ±2.5V, R = 1k

L

= ±1V, R = 5k

±2.5V

10

L

4

LT1352/LT1353

ELECTRICAL CHARACTERISTICS ^{–40°C ≤ T}_A^{≤ 85°C, V}_CM= 0V unless otherwise noted (Note 4).

SYMBOL

PARAMETER

CONDITIONS

V

MIN

TYP

MAX

UNITS

SUPPLY

V

OUT

Output Swing

R = 5k, V = ±10mV

±15V

±5V

±2.5V

13.3

13.2

10.0

3.3

3.2

1.1

±V

L

IN

R = 2k, V = ±10mV

L

IN

R = 1k, V = ±10mV

L

IN

R = 1k, V = ±10mV

L

IN

R = 500Ω, V = ±10mV

L

IN

R = 5k, V = ±10mV

L

IN

I

Output Current

V

= ±10V

= ±3.2V

±15V

±5V

10.0

6.4

mA

OUT

SC

OUT

Short-Circuit Current

Slew Rate

V

OUT

= 0V, V = ±3V

±15V

20

mA

IN

SR

A = –1, R = 5k (Note 2)

V

±15V

±5V

50

15

V/µs

L

GBW

Gain Bandwidth

f = 200kHz, R = 10k

±15V

± 5V

1.6

1.4

MHz

L

Channel Separation

Supply Current

V

= ±10V, R = 2k

±15V

99

dB

OUT

L

I

Each Amplifier

±15V

±5V

380

350

µA

S

Note 1: A heat sink may be required to keep the junction temperature

Note 4: This parameter is not 100% tested.

below absolute maximum when the output is shorted indefinitely.

Note 5: The LT1352/LT1353 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 2: Slew rate is measured between ±8V on the output with ±12V

input for ±15V supplies and ±2V on the output with ±3V input for ±5V

supplies.

Note 3: Full-power bandwidth is calculated from the slew rate

measurement: FPBW = (Slew Rate)/2πV .

P

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TYPICAL PERFORMANCE CHARACTERISTICS

Supply Current vs Supply Voltage

and Temperature

Input Common Mode Range

vs Supply Voltage

Input Bias Current

vs Input Common Mode Voltage

+

V

30

20

10

0

350

300

250

200

150

100

T

= 25°C

OS

T

= 25°C

= ±15V

+

A

S

–0.5

–1.0

–1.5

–2.0

∆V = 1mV

V

–

I

+ I

2

B

I

=

B

125°C

25°C

2.0

1.5

1.0

0.5

–55°C

–10

–20

–

V

15

0

10

15

20

–15

–10

–5

0

5

10

5

10

SUPPLY VOLTAGE (±V)

15

5

0

20

INPUT COMMON MODE VOLTAGE (V)

SUPPLY VOLTAGE (±V)

1352/53 G03

1352/53 G02

1352/53 G01

5

LT1352/LT1353

TYPICAL PERFORMANCE CHARACTERISTICS

W

U

Input Bias Current vs Temperature

Input Noise Spectral Density

Open-Loop Gain vs Resistive Load

40

36

32

28

24

20

16

12

8

110

100

90

100

10

1

10

V

= ±15V

T

= 25°C

T = 25°C

A

S

B

A

S

V

+

–

V

A

= ±15V

= 101

I

B

+ I

2

B

I

=

V

= ±15V

S

R

= 100k

S

V

S

= ±5V

e

n

1

80

i

n

70

4

0

60

0.1

–50

0

25

50

75 100 125

–25

10

100

1k

10k

1

10

1k

10k

100

FREQUENCY (Hz)

TEMPERATURE (°C)

LOAD RESISTANCE (Ω)

1352/53 G04

1352/53 G06

1352/53 G05

Output Voltage Swing

vs Supply Voltage

Output Voltage Swing

vs Load Current

Open-Loop Gain vs Temperature

+

V

100

99

V

= ±15V

= ±12V

= 5k

V

= ±5V

IN

S

O

L

S

–0.5

–1.0

–1.5

–2.0

85°C

= 10mV

R

= 2k

25°C

L

–1

–2

R

–40°C

25°C

= 1k

98

–3

3

–40°C 85°C

T

= 25°C

IN

A

97

V

= ±10mV

25°C

85°C

2.0

1.5

1.0

0.5

96

95

94

R

= 1k

= 2k

2

L

–40°C

25°C

85°C

1

–

V

–20 –15

0

10

15

50

TEMPERATURE (°C)

100 125

–5

20

–50 –25

0

25

75

5

10

SUPPLY VOLTAGE (V)

20

–10

5

0

15

OUTPUT CURRENT (mA)

1352/53 G09

1352/53 G07

1352/53 G08

Output Short-Circuit Current

vs Temperature

Settling Time vs Output Step

(Noninverting)

Settling Time vs Output Step

(Inverting)

10

8

60

55

10

8

V

S

= ±15V

6

10mV

1mV

50

45

40

35

30

4

10mV

1mV

SINK

SOURCE

2

0

–2

–4

–6

–8

–2

–4

–6

–8

–10

V

S

A

V

= ±15V

= 1

10mV

1mV

10mV

1mV

V

A

= ±15V

S

V

G

= –1

OUTPUT

FILTER:

1.6MHz

LPF

R

= R = 2k

F

C = 5pF

F

R

= 2k

L

–10

25

0.7 0.8 0.9

1

1.1 1.2 1.3

1.4 1.5

1.6

50

TEMPERATURE (°C)

100 125

–50 –25

0

25

75

0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5

SETTLING TIME (µs)

1352/53 G11

1352/53 G10

1352/53 G12

6

LT1352/LT1353

W

U

TYPICAL PERFORMANCE CHARACTERISTICS

Frequency Response

vs Capacitive Load

Output Impedance vs Frequency

Gain and Phase vs Frequency

10

8

1000

100

10

70

60

50

40

30

20

10

0

120

100

80

T

= 25°C

= ±15V

T

= 25°C

= ±15V

= –1

T

= 25°C

A

S

A

V

F

A

S

V

A

= –1

PHASE

= ±15V

R = R = 5k

G

6

R

= R = 5k

C = 5000pF

C = 1000pF

FB

G

A

= 100

V

C = 500pF

C = 100pF

4

V

= ±15V

S

A

= 10

A

= 1

S

V

60

2

0

V

S

= ±5V

V

S

= ±5V

40

C = 10pF

GAIN

–2

–4

1

20

0

–6

0.1

0.01

–20

–40

–8

–10

1k

10k

100k

FREQUENCY (Hz)

1M

10M

10k

100k

1M

10M

1k

10k

100k

FREQUENCY (Hz)

1M

10M

100M

FREQUENCY (Hz)

1352/53 G14

1352/53 G13

1352/53 G15

Gain Bandwidth and Phase Margin

vs Temperature

Frequency Response

vs Supply Voltage (A_V= 1)

Frequency Response

vs Supply Voltage (A_V= –1)

4.50

4.25

4.00

3.75

3.50

3.25

3.00

2.75

2.50

2.25

2.00

50

48

46

44

42

40

38

36

34

32

30

5

4

3

2

T

= 25°C

= 1

= 5k

T = 25°C

A

V

= ±15V

= ±5V

A

V

L

S

4

3

2

A

R

= –1

V

R

= R = 5k

F G

V

S

PHASE MARGIN

1

0

1

0

GAIN BANDWIDTH

–1

–2

–3

–4

–5

–1

–2

–3

–4

–5

V

= ±15V

= ±5V

S

±15V

±5V

±2.5V

±15V

±5V

±2.5V

V

S

–50

0

25

50

75 100 125

10k

100k

1M

10M

10k

100k

1M

10M

–25

TEMPERATURE (°C)

FREQUENCY (Hz)

1352/53 G17

1352/53 G18

1352/53 G16

Gain Bandwidth and Phase Margin

vs Supply Voltage

Power Supply Rejection Ratio

vs Frequency

Common Mode Rejection Ratio

vs Frequency

4.50

4.25

4.00

3.75

3.50

3.25

3.00

2.75

2.50

2.25

2.00

50

48

46

44

42

40

38

36

34

32

30

120

100

80

60

40

20

0

120

100

T

= 25°C

= ±15V

T = 25°C

A

S

T

= 25°C

A

V

= ±15V

S

PHASE MARGIN

80

60

–PSRR = +PSRR

40

20

0

GAIN BANDWIDTH

0

10

15

20

10

1k

10k 100k

1M

10M

5

100

1k

10k

100k

1M

10M

SUPPLY VOLTAGE (±V)

FREQUENCY (Hz)

1352/53 G19

1352/53 G20

1352/53 G21

7

LT1352/LT1353

TYPICAL PERFORMANCE CHARACTERISTICS

W

U

Slew Rate vs Supply Voltage

Slew Rate vs Temperature

Slew Rate vs Input Level

250

200

150

100

50

200

150

100

50

200

175

150

125

T

= 25°C

A = –1

V

T

= 25°C

= ±15V

= –1

A

V

F

A

S

V

A

= –1

R = R = R = 5k

F G L

V

A

+

–

R = R = 5k

SR = (SR + SR )/2

G

+

–

R

= R = 5k

FB

G

+

–

V

= ±15V

S

SR = (SR + SR )/2

100

75

V

S

= ±5V

50

25

0

5

10

15

50

125

–50 –25

0

25

75 100

4

8

16

0

20

24

12

SUPPLY VOLTAGE (±V)

TEMPERATURE (°C)

INPUT LEVEL (V

)

P-P

1352/53 G22

1352/53 G23

1352/53 G24

Total Harmonic Distortion

vs Frequency

Undistorted Output Swing

vs Frequency (±15V)

vs Frequency (±5V)

30

25

20

15

10

5

10

9

8

7

6

5

4

3

2

1

0

1

T

= 25°C

= ±15V

= 5k

A

S

L

O

A

= –1

V

R

V

A

= 1

= 2V

V

P-P

0.1

A

V

= 1

A

V

= –1

0.01

A

= –1

= 1

V

= ±15V

V

= ±5V

S

L

S

L

R

= 5k

R

= 5k

THD = 1%

A

THD = 1%

V

0.001

0

10k

100k

1M

10k

100k

1M

10

100

1k

FREQUENCY (Hz)

10k

100k

FREQUENCY (Hz)

1352/53 G27

1352/53 G26

1352/53 G25

2nd and 3rd Harmonic Distortion

vs Frequency

Capacitive Load Handling

Crosstalk vs Frequency

–40

–50

100

90

–30

–40

–50

–60

–70

–80

–90

T

= 25°C

= 1

V

A

= ±15V

= 1

T

= 25°C

= ±15V

= 5k

A

V

L

S

V

L

A

S

L

A

V

R

V

= 1k

R

= 5k

R

80

V

= 2V

= 15dBm

O

P-P

–60

IN

70

A

= 1

V

–70

60

50

3RD HARMONIC

2ND HARMONIC

–80

40

30

20

10

0

–90

A

= –1

V

–100

–110

–120

100k

1M

10p

100p

1n

10n

0.1µ

1µ

100

1k

10k

100k

1M

10M

FREQUENCY (Hz)

CAPACITIVE LOAD (F)

FREQUENCY (Hz)

1352/53 G28

1352/53 G30

1352/53 G29

8

LT1352/LT1353

W

U

TYPICAL PERFORMANCE CHARACTERISTICS

Small-Signal Transient

(A_V= 1)

Small-Signal Transient

(A_V= –1)

Small-Signal Transient

(A_V= –1, C_L= 1000pF)

1352/53 G31

1352/53 G32

1352/53 G33

Large-Signal Transient

(A_V= 1)

Large-Signal Transient

(A_V= –1)

Large-Signal Transient

(A_V= 1, C_L= 10,000pF)

1352/53 G34

1352/53 G35

1352/53 G36

U

W U U

APPLICATIONS INFORMATION

Layout and Passive Components

Capacitive Loading

The LT1352/LT1353 amplifiers are easy to use and toler-

ant of less than ideal layouts. For maximum performance

(for example, fast 0.01% settling) use a ground plane,

shortleadlengthsandRF-qualitybypasscapacitors(0.01µF

to 0.1µF). For high drive current applications use low ESR

bypass capacitors (1µF to 10µF tantalum).

The LT1352/LT1353 are stable with any capacitive load.

As the capacitive load increases, both the bandwidth and

phase margin decrease so there will be peaking in the

frequency domain and in the transient response. Graphs

of Frequency Response vs Capacitive Load, Capacitive

Load Handling and the transient response photos clearly

show these effects.

The parallel combination of the feedback resistor and

gain setting resistor on the inverting input can combine

withtheinputcapacitancetoformapolewhichcancause

peakingorevenoscillations. Iffeedbackresistorsgreater

than 10k are used, a parallel capacitor of value, C_F>

(R_G)(C_IN/R_F), should be used to cancel the input pole and

optimize dynamic performance. For applications where

the DC noise gain is one and a large feedback resistor is

used, C_Fshould be greater than or equal to C_IN. An

example would be an I-to-V converter as shown in the

Typical Applications section.

Input Considerations

Each of the LT1352/LT1353 amplifier inputs is the base of

an NPN and PNP transistor whose base currents are of

opposite polarity and provide first order bias current

cancellation. Because of variation in the matching of NPN

and PNP beta, the polarity of the input current can be

positiveornegative.Theoffsetcurrentdoesnotdependon

NPN to PNP beta matching and is well controlled. The use

of balanced source resistance at each input is recom-

9

LT1352/LT1353

U

W U U

APPLICATIONS INFORMATION

mended for applications where DC accuracy must be

maximized. The inputs can withstand differential input

voltages of up to 10V without damage and need no

clamping or source resistance for protection. Differential

inputs generate large supply currents (up to 40mA) as

required for high slew rates. Typically power dissipation

does not significantly increase because of the low duty

cycle of the transient inputs. If the device is used as a

comparator with sustained differential inputs, excessive

power dissipation may result.

Capacitive load compensation is provided by the R_CC_C

,

network which is bootstrapped across the output stage.

When the amplifier is driving a light load the network has

no effect. When driving a capacitive load (or a low value

resistive load) the network is incompletely bootstrapped

and adds to the compensation at the high impedance

node. The added capacitance slows down the amplifier

andazeroiscreatedbytheRCcombination, bothofwhich

improve the phase margin. The design ensures that even

for very large load capacitances, the total phase lag can

never exceed 180 degrees (zero phase margin) and the

amplifier remains stable.

Circuit Operation

The LT1352/LT1353 circuit topology is a true voltage

feedback amplifier that has the slewing behavior of a

currentfeedbackamplifier.Theoperationofthecircuitcan

be understood by referring to the Simplified Schematic.

Power Dissipation

TheLT1352/LT1353combinehighspeedandlargeoutput

drive in small packages. Because of the wide supply

voltage range, it is possible to exceed the maximum

junction temperature of 150°C under certain conditions.

Maximum junction temperature T_Jis calculated from the

ambient temperature T_Aand power dissipation P_Das

follows:

The inputs are buffered by complementary NPN and PNP

emitter followers which drive R1, a 1k resistor. The input

voltage appears across the resistor generating currents

which are mirrored into the high impedance node and

compensation capacitor C_T. Complementary followers

form an output stage which buffers the gain node from the

load. The output devices Q19 and Q22 are connected to

form a composite PNP and a composite NPN.

LT1352CN8: T_J= T_A+ (P_D)(130°C/W)

LT1352CS8: T_J= T_A+ (P_D)(190°C/W)

LT1353CS: T_J= T_A+ (P_D)(150°C/W)

The bandwidth is set by the input resistor and the capaci-

tance on the high impedance node. The slew rate is

determined by the current available to charge the high

impedance node capacitance. This current is the differen-

tial input voltage divided by R1, so the slew rate is

proportional to the input. Highest slew rates are therefore

seen in the lowest gain configurations. For example, a 10V

outputstepinagainof10hasonlya1Vinputstepwhereas

the same output step in unity gain has a 10 times greater

input step. The graph Slew Rate vs Input Level illustrates

this relationship. In higher gain configurations the large-

signal performance and the small-signal performance

both look like a single pole response.

Worst-case power dissipation occurs at the maximum

supply current and when the output voltage is at 1/2 of

either supply voltage (or the maximum swing if less than

1/2 supply voltage). For each amplifier P_D(MAX)is:

P_D(MAX)= (V⁺– V^–)(I_S(MAX)) + (V⁺/2)²/R_Lor

(V⁺– V^–)(I_S(MAX)) + (V⁺– V_MAX)(I_MAX

)

Example: LT1353 in S14 at 85°C, V_S= ±15V, R_L= 500Ω,

V_OUT= ±5V (±10mA)

P_D(MAX)=(30V)(380µA)+(15V–5V)(10mA)=111mW

T_J= 85°C + (4)(111mW)(150°C/W) = 152°C

10

LT1352/LT1353

W

SI PLIFIED SCHE ATIC

+

V

R2

R3

Q11

Q10

Q12

Q17

Q20

Q21

C1

R6

Q9

Q19

Q3

Q4

Q7

Q8

R1

1k

C

R

C

Q5

Q1

–IN

+IN

Q2

OUTPUT

Q6

Q18

Q16

R7

Q22

R4

Q13

Q15

C2

C

T

Q14

Q23

Q24

R5

–

1352/53 SS

V

U

TYPICAL APPLICATIONS

400kHz Photodiode Preamp with 10kHz Highpass Loop

DAC I-to-V Converter

1N5712

10pF

10k

12

5k

DAC

–

INPUTS

1/2

LT1352

–

V

OUT

565A TYPE

1/2

V

OUT

+

LT1352

+

BPV22NF

1.5k

10k

5k

V

A

OUT

V

+ I (5kΩ) +

OS OS

< 0.5LSB

+

–

1352/53 TA03

VOL

1/2

10nF

LT1352

10nF

10k

1352/53 TA05

20kHz, 4th Order Butterworth Filter

4.64k

5.49k

470pF

220pF

4.64k

13.3k

V

–

IN

5.49k

11.3k

1/2

LT1352

–

2200pF

1/2

LT1352

V

OUT

+

4700pF

+

1352/53 TA04

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

LT1352/LT1353

U

Dimensions in inches (millimeters) unless otherwise noted.

PACKAGE DESCRIPTION

N8 Package

8-Lead PDIP (Narrow 0.300)

(LTC DWG # 05-08-1510)

0.400*

(10.160)

MAX

0.130 ± 0.005

0.300 – 0.325

0.045 – 0.065

(3.302 ± 0.127)

(1.143 – 1.651)

(7.620 – 8.255)

8

1

7

6

5

4

0.065

(1.651)

TYP

0.255 ± 0.015*

(6.477 ± 0.381)

0.009 – 0.015

(0.229 – 0.381)

0.125

0.005

(0.127)

MIN

0.015

(0.380)

MIN

(3.175)

MIN

+0.025

–0.015

2

3

0.325

0.100 ± 0.010

(2.540 ± 0.254)

0.018 ± 0.003

+0.635

8.255

(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

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD

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

1

2

3

4

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

(5.791 – 6.197)

0.150 – 0.157**

(3.810 – 3.988)

0.050

(1.270)

TYP

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

RELATED PARTS

PART NUMBER DESCRIPTION

COMMENTS

Good DC Precision, C-Load Stable, Power Saving Shutdown

Single/Dual/Quad 1mA, 12MHz, 400V/µs Op Amp Good DC Precision, Stable with All Capacitive Loads

LT1351

LT1354/55/56

250µA, 3MHz, 200V/µs Op Amp

LT/GP 0796 7K • PRINTED IN USA

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

12

●

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

LINEAR TECHNOLOGY CORPORATION 1996


型号：	LT1352CN8
厂家：	Linear
描述：	Dual and Quad 250uA, 3MHz, 200V/us Operational Amplifiers 双核和四250uA ，为3MHz ， 200V / us的运算放大器运算放大器
文件：	总12页 (文件大小：328K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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