National Semiconductor LF155, LF156, LF256, LF257, LF355 Technical data

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LF155H

December 2001

LF155/LF156/LF256/LF257/LF355/LF356/LF357

JFET Input Operational Amplifiers

General Description

These are the first monolithic JFET input operational amplifiers to incorporate well matched, high voltage JFETs on the same chip with standard bipolar transistors (BI-FET Technology). These amplifiers feature low input bias and offset currents/low offset voltage and offset voltage drift, coupled with offset adjust which does not degrade drift or common-mode rejection. The devices are also designed for high slew rate, wide bandwidth, extremely fast settling time, low voltage and current noise and a low 1/f noise corner.

nLogarithmic amplifiers

nPhotocell amplifiers

nSample and Hold circuits

Common Features

nLow input bias current: 30pA

nLow Input Offset Current: 3pA

nHigh input impedance: 1012Ω

n Low input noise current:

nHigh common-mode rejection ratio: 100 dB

nLarge dc voltage gain: 106 dB

Features

Advantages

nReplace expensive hybrid and module FET op amps

nRugged JFETs allow blow-out free handling compared with MOSFET input devices

nExcellent for low noise applications using either high or low source impedance Ð very low 1/f corner

nOffset adjust does not degrade drift or common-mode rejection as in most monolithic amplifiers

nNew output stage allows use of large capacitive loads (5,000 pF) without stability problems

nInternal compensation and large differential input voltage capability

Applications

nPrecision high speed integrators

nFast D/A and A/D converters

nHigh impedance buffers

nWideband, low noise, low drift amplifiers

Uncommon Features

 

LF155/

LF156/

LF257/

Units

 

LF355

LF256/

LF357

 

 

 

LF356

(AV=5)

 

j Extremely

4

1.5

1.5

µs

fast settling

 

 

 

 

time to

 

 

 

 

0.01%

 

 

 

 

j Fast slew

5

12

50

V/µs

rate

 

 

 

 

j Wide gain

2.5

5

20

MHz

bandwidth

 

 

 

 

j Low input

20

12

12

 

noise

 

 

 

 

voltage

 

 

 

 

Simplified Schematic

00564601

*3pF in LF357 series.

BI-FET, BI-FET IIare trademarks of National Semiconductor Corporation.

Amplifiers Operational Input JFET LF155/LF156/LF256/LF257/LF355/LF356/LF357

© 2001 National Semiconductor Corporation

DS005646

www.national.com

LF155/LF156/LF256/LF257/LF355/LF356/LF357

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, contact the National Semiconductor Sales Office/Distributors for availability and specifications.

 

 

 

 

 

LF155/6

 

 

LF256/7/LF356B

 

LF355/6/7

 

 

 

 

Supply Voltage

 

 

±22V

 

 

 

 

±22V

 

 

±18V

 

 

 

 

Differential Input Voltage

 

 

±40V

 

 

 

 

±40V

 

 

±30V

 

 

 

 

Input Voltage Range (Note 2)

 

±20V

 

 

 

 

±20V

 

 

±16V

 

 

 

 

Output Short Circuit Duration

Continuous

Continuous

Continuous

 

 

 

 

TJMAX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H-Package

 

 

150ÊC

 

 

 

 

115ÊC

 

 

115ÊC

 

 

 

 

N-Package

 

 

 

 

 

 

 

 

100ÊC

 

 

100ÊC

 

 

 

 

M-Package

 

 

 

 

 

 

 

 

100ÊC

 

 

100ÊC

 

 

 

 

Power Dissipation at TA = 25ÊC (Notes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1, 8)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H-Package (Still Air)

 

560 mW

 

 

 

400 mW

 

 

400 mW

 

 

 

 

H-Package (400 LF/Min Air Flow)

1200 mW

 

1000 mW

 

1000 mW

 

 

 

 

N-Package

 

 

 

 

 

 

 

670 mW

 

 

670 mW

 

 

 

 

M-Package

 

 

 

 

 

 

 

380 mW

 

 

380 mW

 

 

 

 

Thermal Resistance (Typical) θJA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H-Package (Still Air)

 

160ÊC/W

 

 

 

160ÊC/W

 

160ÊC/W

 

 

 

 

H-Package (400 LF/Min Air Flow)

 

65ÊC/W

 

 

 

 

65ÊC/W

 

 

65ÊC/W

 

 

 

 

N-Package

 

 

 

 

 

 

 

130ÊC/W

 

 

130ÊC/W

 

 

 

 

M-Package

 

 

 

 

 

 

 

195ÊC/W

 

 

195ÊC/W

 

 

 

 

(Typical) θJC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H-Package

 

 

23ÊC/W

 

 

 

 

23ÊC/W

 

 

23ÊC/W

 

 

 

 

Storage Temperature Range

−65ÊC to +150ÊC

−65ÊC to +150ÊC

−65ÊC to +150ÊC

 

 

 

 

Soldering Information (Lead Temp.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Metal Can Package

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Soldering (10 sec.)

 

 

300ÊC

 

 

 

 

300ÊC

 

 

300ÊC

 

 

 

 

Dual-In-Line Package

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Soldering (10 sec.)

 

 

260ÊC

 

 

 

 

260ÊC

 

 

260ÊC

 

 

 

 

Small Outline Package

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vapor Phase (60 sec.)

 

 

 

 

 

 

 

215ÊC

 

 

215ÊC

 

 

 

 

Infrared (15 sec.)

 

 

 

 

 

 

 

 

220ÊC

 

 

220ÊC

 

 

 

 

See AN-450 ªSurface Mounting Methods and Their Effect on Product Reliabilityº for other methods of

 

 

 

 

soldering surface mount devices.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ESD tolerance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(100 pF discharged through 1.5kΩ)

 

1000V

 

 

 

 

1000V

 

 

1000V

 

 

DC Electrical Characteristics

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Note 3)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LF155/6

 

 

 

LF256/7

 

 

LF355/6/7

 

Symbol

Parameter

 

Conditions

 

 

 

 

 

LF356B

 

 

Units

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Min

 

Typ

 

Max

 

Min

Typ

 

Max

 

Min

Typ

Max

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOS

 

Input Offset Voltage

 

RS=50Ω, TA=25ÊC

 

 

 

3

 

5

 

 

3

 

5

 

 

3

10

mV

 

 

 

 

Over Temperature

 

 

 

 

 

7

 

 

 

 

6.5

 

 

 

13

mV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOS/

T

Average TC of Input

 

RS=50Ω

 

 

 

5

 

 

 

 

5

 

 

 

 

5

 

µV/ÊC

 

 

Offset Voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TC/

VOS

Change in Average TC

 

RS=50Ω, (Note 4)

 

 

 

0.5

 

 

 

 

0.5

 

 

 

 

0.5

 

µV/ÊC

 

 

with VOS Adjust

 

 

 

 

 

 

 

 

 

 

 

 

 

 

per mV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IOS

 

Input Offset Current

 

TJ=25ÊC, (Notes 3, 5)

 

 

3

 

20

 

 

3

 

20

 

 

3

50

pA

 

 

 

 

TJTHIGH

 

 

 

 

 

20

 

 

 

 

1

 

 

 

2

nA

www.national.com

2

DC Electrical Characteristics

(Continued)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Note 3)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LF155/6

 

 

 

 

LF256/7

 

 

 

 

LF355/6/7

 

 

Symbol

 

 

Parameter

 

Conditions

 

 

 

 

 

 

 

LF356B

 

 

 

 

Units

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Min

Typ

 

Max

Min

 

Typ

 

Max

Min

 

 

Typ

 

Max

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IB

 

Input Bias Current

TJ=25ÊC, (Notes 3, 5)

 

 

30

 

100

 

 

30

 

100

 

 

 

30

 

200

pA

 

 

 

 

 

 

 

TJTHIGH

 

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

5

 

 

 

 

 

 

8

 

nA

R

 

Input Resistance

T

=25ÊC

 

 

 

 

 

 

 

1012

 

 

 

 

 

1012

 

 

 

 

 

 

1012

 

 

 

 

Ω

IN

 

 

 

 

 

J

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AVOL

 

Large Signal Voltage

VS=±15V, TA=25ÊC

 

50

 

200

 

 

 

50

 

200

 

 

 

25

 

200

 

 

 

 

V/mV

 

 

 

Gain

 

 

VO=±10V, RL=2k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Over Temperature

 

25

 

 

 

 

 

 

25

 

 

 

 

 

 

15

 

 

 

 

 

 

 

V/mV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VO

 

Output Voltage Swing

VS=±15V, RL=10k

 

±12

±13

 

 

 

±12

±13

 

 

 

±12

 

±13

 

 

 

 

V

 

 

 

 

 

 

 

VS=±15V, RL=2k

 

±10

±12

 

 

 

±10

±12

 

 

 

±10

 

±12

 

 

 

 

V

VCM

 

Input Common-Mode

VS=±15V

 

 

 

 

±11

+15.1

 

 

 

±11

±15.1

 

 

 

+10

 

+15.1

 

 

 

 

V

 

 

 

Voltage Range

 

 

 

 

 

 

 

 

−12

 

 

 

 

−12

 

 

 

 

 

−12

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CMRR

 

Common-Mode

 

 

 

 

 

 

 

 

85

 

100

 

 

 

85

 

100

 

 

 

80

 

100

 

 

 

 

dB

 

 

 

Rejection Ratio

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PSRR

 

Supply Voltage

(Note 6)

 

 

 

 

 

85

 

100

 

 

 

85

 

100

 

 

 

80

 

100

 

 

 

 

dB

 

 

 

Rejection Ratio

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DC Electrical Characteristics

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TA = TJ = 25ÊC, VS = ±15V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parameter

LF155

 

 

LF355

 

LF156/256/257/356B

 

 

LF356

 

 

 

LF357

 

 

 

Units

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Typ

Max

 

Typ

 

Max

 

 

Typ

 

Max

 

Typ

 

Max

 

Typ

 

 

Max

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Supply

 

 

2

4

 

2

 

 

4

 

 

 

5

 

 

7

 

 

5

 

 

10

 

 

5

 

 

 

10

 

 

 

 

mA

Current

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AC Electrical Characteristics

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TA = TJ = 25ÊC, VS = ±15V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LF155/355

LF156/256/

 

LF156/256/356/

 

LF257/357

 

 

 

Symbol

 

 

 

Parameter

 

Conditions

 

 

 

 

 

 

356B

 

 

LF356B

 

 

 

 

 

 

 

 

Units

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Typ

 

 

 

Min

 

 

Typ

 

 

 

Typ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SR

 

Slew Rate

 

 

LF155/6:

 

 

 

5

 

 

 

 

7.5

 

 

12

 

 

 

 

 

 

 

 

 

 

V/µs

 

 

 

 

 

 

 

AV=1,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LF357: AV=5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50

 

 

 

 

V/µs

 

GBW

 

Gain Bandwidth Product

 

 

 

 

 

 

 

2.5

 

 

 

 

 

 

 

 

5

 

 

 

 

20

 

 

 

 

MHz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ts

 

Settling Time to 0.01%

(Note 7)

 

 

 

 

4

 

 

 

 

 

 

 

 

1.5

 

 

 

1.5

 

 

 

 

µs

en

 

Equivalent Input Noise

RS=100Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltage

 

 

f=100 Hz

 

 

 

25

 

 

 

 

 

 

 

 

15

 

 

 

15

 

 

 

 

 

 

 

 

 

 

 

 

 

f=1000 Hz

 

 

 

20

 

 

 

 

 

 

 

 

12

 

 

 

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

in

 

Equivalent Input Current

f=100 Hz

 

 

 

0.01

 

 

 

 

 

 

 

 

0.01

 

 

 

0.01

 

 

 

 

 

 

 

 

Noise

 

 

f=1000 Hz

 

 

 

0.01

 

 

 

 

 

 

 

 

0.01

 

 

 

0.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CIN

 

Input Capacitance

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

3

 

 

 

 

3

 

 

 

 

pF

 

Notes for Electrical Characteristics

Note 1: The maximum power dissipation for these devices must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The maximum available power dissipation at any temperature is PD=(TJMAX−T A)/θJA or the 25ÊC PdMAX, whichever is less.

Note 2: Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage.

Note 3: Unless otherwise stated, these test conditions apply:

LF155/LF156/LF256/LF257/LF355/LF356/LF357

3

www.national.com

LF155/LF156/LF256/LF257/LF355/LF356/LF357

Notes for Electrical Characteristics (Continued)

 

LF155/156

LF256/257

LF356B

LF355/6/7

 

 

 

 

 

Supply Voltage, VS

±15V VS ±20V

±15V VS ±20V

±15V VS ±20V

VS= ±15V

TA

−55ÊC TA +125ÊC

−25ÊC TA +85ÊC

0ÊC TA +70ÊC

0ÊC TA +70ÊC

THIGH

+125ÊC

+85ÊC

+70ÊC

+70ÊC

and VOS, IB and IOS are measured at VCM = 0.

Note 4: The Temperature Coefficient of the adjusted input offset voltage changes only a small amount (0.5µV/ÊC typically) for each mV of adjustment from its o riginal unadjusted value. Common-mode rejection and open loop voltage gain are also unaffected by offset adjustment.

Note 5: The input bias currents are junction leakage currents which approximately double for every 10ÊC increase in the junction temperature, TJ. Due to limited production test time, the input bias currents measured are correlated to junction temperature. In normal operation the junction temperature rises above the ambient temperature as a result of internal power dissipation, Pd. TJ = TA + θJA Pd where θJA is the thermal resistance from junction to ambient. Use of a heat sink is recommended if input bias current is to be kept to a minimum.

Note 6: Supply Voltage Rejection is measured for both supply magnitudes increasing or decreasing simultaneously, in accordance with common practice.

Note 7: Settling time is defined here, for a unity gain inverter connection using 2 kΩ resistors for the LF155/6. It is the time required for the error voltage (the voltage at the inverting input pin on the amplifier) to settle to within 0.01% of its final value from the time a 10V step input is applied to the inverter. For the LF357, AV = −5, the feedback resistor from output to input is 2kΩ and the output step is 10V (See Settling Time Test Circuit).

Note 8: Max. Power Dissipation is defined by the package characteristics. Operating the part near the Max. Power Dissipation may cause the part to operate outside guaranteed limits.

Typical DC Performance Characteristics Curves are for LF155 and LF156 unless otherwise specified.

Input Bias Current

Input Bias Current

 

00564637

00564638

Input Bias Current

 

Voltage Swing

00564639

00564640

 

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4

Typical DC Performance Characteristics Curves are for LF155 and LF156 unless otherwise specified. (Continued)

Supply Current

Supply Current

 

00564641

00564642

 

 

Negative Current Limit

 

Positive Current Limit

 

00564643

00564644

Positive Common-Mode

 

Negative Common-Mode

Input Voltage Limit

 

Input Voltage Limit

00564645

00564646

LF155/LF156/LF256/LF257/LF355/LF356/LF357

5

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LF155/LF156/LF256/LF257/LF355/LF356/LF357

Typical DC Performance Characteristics Curves are for LF155 and LF156 unless otherwise specified. (Continued)

Open Loop Voltage Gain

Output Voltage Swing

00564647

00564648

Typical AC Performance Characteristics

Gain Bandwidth

Gain Bandwidth

00564650

 

00564649

Normalized Slew Rate

Output Impedance

00564651

00564652

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6

National Semiconductor LF155, LF156, LF256, LF257, LF355 Technical data

Typical AC Performance Characteristics (Continued)

Output Impedance

LF155 Small Signal Pulse Response, AV = +1

00564605

00564653

 

LF156 Small Signal Pulse Response, AV = +1

LF155 Large Signal Pulse Response, AV = +1

00564606

00564608

LF156 Large Signal Puls

 

Response, AV = +1

Inverter Settling Time

00564609

00564655

LF155/LF156/LF256/LF257/LF355/LF356/LF357

7

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