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产品型号LF442AMH的概述

LF442AMH 芯片概述 LF442AMH 是一种高性能双通道运算放大器，属于低噪声、低偏置电流的系列。该芯片广泛应用于多种电子设计领域，包括音频处理、信号调理及传感器接口等。LF442AMH 具有较高的增益带宽积，出色的动态响应特性以及相对较低的功耗，使得它在诸多应用场合中得到了广泛的使用。 LF442AMH详细参数 LF442AMH 的基本参数包括： - 功率供应电压：±4V 至 ±18V - 增益带宽积：约 20MHz - 输入失调电压：最大 2mV - 输入失调电流：最大 100nA - 输出摆幅：能接近电源轨的范围 - 电源电流：单通道约 2.5mA，双通道约 5mA - 输入阻抗：≥ 10^6Ω - 输出阻抗：约 75Ω 这些参数使得 LF442AMH 能够处理高频信号，同时保持出色的性能和稳定性。厂家、包装和封装 LF442AMH 由 National Semico...

产品型号LF442AMH的Datasheet PDF文件预览

April 1999

LF442

Dual Low Power JFET Input Operational Amplifier

General Description

Features

n 1/10 supply current of a LM1458: 400 µA (max)

n Low input bias current: 50 pA (max)

n Low input offset voltage: 1 mV (max)

n Low input offset voltage drift: 10 µV/˚C (max)

n High gain bandwidth: 1 MHz

The LF442 dual low power operational amplifiers provide

many of the same AC characteristics as the industry stan-

dard LM1458 while greatly improving the DC characteristics

of the LM1458. The amplifiers have the same bandwidth,

slew rate, and gain (10 kΩ load) as the LM1458 and only

draw one tenth the supply current of the LM1458. In addition

the well matched high voltage JFET input devices of the

LF442 reduce the input bias and offset currents by a factor of

10,000 over the LM1458. A combination of careful layout de-

sign and internal trimming guarantees very low input offset

voltage and voltage drift. The LF442 also has a very low

equivalent input noise voltage for a low power amplifier.

n High slew rate: 1 V/µs

n Low noise voltage for low power:

n Low input noise current:

n High input impedance: 10¹²Ω

10V, R_L10k: 50k (min)

n High gain V_O

The LF442 is pin compatible with the LM1458 allowing an

immediate 10 times reduction in power drain in many appli-

cations. The LF442 should be used where low power dissi-

pation and good electrical characteristics are the major con-

siderations.

Typical Connection

Connection Diagrams

Metal Can Package

DS009155-2

Pin 4 connected to case

Top View

DS009155-1

Ordering Information

LF442XYZ

Order Number LF442AMH or LF442MH

or LF442MH/883

See NS Package Number H08A

Dual-In-Line Package

indicates electrical grade

indicates temperature range

“M” for military

“C” for commercial

indicates package type

“H” or “N”

DS009155-4

Top View

Order Number LF442ACN or LF442CN

See NS Package Number N08E

™

BI-FET II is a trademark of National Semiconductor Corporation.

DS009155

www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

H Package

N Package

θ_JA(Typical)

(Note 4)

65˚C/W

165˚C/W

114˚C/W

152˚C/W

(Note 5)

θ_JC(Typical)

21˚C/W

(Note 5)

LF442A

LF442

Operating Temperature

Range

(Note 5)

Supply Voltage

22V

38V

19V

18V

30V

15V

Differential Input Voltage

Input Voltage Range

(Note 2)

Storage

−65˚C≤T_A≤150˚C −65˚C≤T_A≤150˚C

260˚C 260˚C

Rating to be determined

Temperature Range

Lead Temperature

(Soldering, 10 sec.)

ESD Tolerance

Output Short Circuit

Duration (Note 3)

Continuous

H Package

150˚C

N Package

T_jmax

115˚C

DC Electrical Characteristics (Note 7)

Symbol

Parameter

Conditions

LF442A

LF442

Typ

Units

Min

Typ

Max

Min

Max

5.0

V_OS

Input Offset Voltage

R_S10 kΩ, T_A25˚C

0.5

1.0

Over Temperature

7.5

∆V_OS/∆T

I_OS

Average TC of Input

Offset Voltage

R_S10 kΩ

µV/˚C

Input Offset Current

V_S

15V

T_j25˚C

1.5

(Notes 7, 8)

T_j70˚C

1.5

T_j125˚C

I_B

Input Bias Current

V_S

15V

T_j25˚C

100

(Notes 7, 8)

T_j70˚C

T_j125˚C

R_IN

Input Resistance

Large Signal Voltage

Gain

T_j25˚C

10¹²

200

10¹²

200

Ω

A_VOL

V_S

15V, V_O

10V,

V/mV

R_L10 kΩ, T_A25˚C

Over Temperature

200

V/mV

V_O

Output Voltage Swing

Input Common-Mode

Voltage Range

V_S

15V, R_L10 kΩ

V_CM

+18

−17

100

+14

−12

CMRR

PSRR

I_S

Common-Mode

Rejection Ratio

Supply Voltage

R_S≤ 10 kΩ

(Note 9)

100

300

µA

Rejection Ratio

Supply Current

400

500

AC Electrical Characteristics (Note 7)

Symbol

Parameter

Conditions

LF442A

Typ

LF442

Typ

Units

Min

Max

Min

Max

Amplifier to Amplifier

Coupling

T_A25˚C, f 1 Hz-20 kHz

−120

(Input Referred)

Slew Rate

V_S

15V, T_A25˚C

0.8

0.6

V/µs

MHz

GBW

e_n

Gain-Bandwidth Product

Equivalent Input Noise

Voltage

15V, T_A25˚C

T_A25˚C, R_S100Ω,

1 kHz

i_n

Equivalent Input Noise

Current

T_A25˚C, f 1 kHz

0.01

www.national.com

AC Electrical Characteristics (Note 7) (Continued)

Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee specific performance limits.

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

Note 3: Any of the amplifier outputs can be shorted to ground indefinitely, however, more than one should not be simultaneously shorted as the maximum junction

temperature will be exceeded.

Note 4: The value given is in 400 linear feet/min air flow.

Note 5: The value given is in static air.

Note 6: These devices are available in both the commercial temperature range 0˚C ≤ T ≤ 70˚C and the military temperature range −55˚C ≤ T ≤ 125˚C. The tem-

perature range is designated by the position just before the package type in the device number. A “C” indicates the commercial temperature range and an “M” indi-

cates the military temperature range. The military temperature range is available in “H” package only.

Note 7: Unless otherwise specified, the specifications apply over the full temperature range and for V

20V for the LF442A and for V

15V for the LF442.

, I , and I

OS OS

are measured at V

Note 8: The input bias currents are junction leakage currents which approximately double for every 10˚C increase in the junction temperature, T . Due to limited pro-

duction test time, the input bias currents measured are correlated to junction temperature. In normal operation the junction temperature rises above the ambient tem-

perature as a result of internal power dissipation, P . T

+ θ P where θ is the thermal resistance from junction to ambient. Use of a heat sink is recommended

jA D jA

if input bias current is to be kept to a minimum.

Note 9: Supply voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously in accordance with common practice from

15V to 5V for the LF442 and 20V to 5V for the LF442A.

Note 10: Refer to RETS442X for LF442MH military specifications.

Typical Performance Characteristics

Input Bias Current

Supply Current

DS009155-18

DS009155-17

DS009155-19

Positive Common-Mode

Input Voltage Limit

Negative Common-Mode

Input Voltage Limit

Positive Current Limit

DS009155-22

DS009155-20

DS009155-21

www.national.com

Typical Performance Characteristics (Continued)

Negative Current Limit

Output Voltage Swing

DS009155-23

DS009155-25

DS009155-24

Gain Bandwidth

Bode Plot

Slew Rate

DS009155-27

DS009155-28

DS009155-26

Distortion vs Frequency

Undistorted Output Voltage

Swing

Open Loop Frequency

Response

DS009155-29

DS009155-31

DS009155-30

www.national.com

Typical Performance Characteristics (Continued)

Common-Mode Rejection

Ratio

Power Supply Rejection

Ratio

Equivalent Input Noise

Voltage

DS009155-32

DS009155-33

DS009155-34

Open Loop Voltage Gain

Output Impedance

Inverter Settling Time

DS009155-35

DS009155-37

DS009155-36

Pulse Response R_L10 kΩ, C_L10 pF

Small Signal Inverting

Small Signal Non-Inverting

DS009155-7

DS009155-8

www.national.com

Pulse Response R_L10 kΩ, C_L10 pF (Continued)

Large Signal Inverting

Large Signal Non-Inverting

DS009155-9

DS009155-10

Application Hints

10V

This device is a dual low power op amp with internally

trimmed input offset voltages and JFET input devices

(BI-FET II). These JFETs have large reverse breakdown volt-

ages from gate to source and drain eliminating the need for

clamps across the inputs. Therefore, large differential input

voltages can easily be accommodated without a large in-

crease in input current. The maximum differential input volt-

age is independent of the supply voltages. However, neither

of the input voltages should be allowed to exceed the nega-

tive supply as this will cause large currents to flow which can

result in a destroyed unit.

The amplifiers will drive a 10 kΩ load resistance to

over the full temperature range.

Precautions should be taken to ensure that the power supply

for the integrated circuit never becomes reversed in polarity

or that the unit is not inadvertently installed backwards in a

socket as an unlimited current surge through the resulting

forward diode within the IC could cause fusing of the internal

conductors and result in a destroyed unit.

As with most amplifiers, care should be taken with lead

dress, component placement and supply decoupling in order

to ensure stability. For example, resistors from the output to

an input should be placed with the body close to the input to

minimize “pick-up” and maximize the frequency of the feed-

back pole by minimizing the capacitance from the input to

ground.

Exceeding the negative common-mode limit on either input

will force the output to a high state, potentially causing a re-

versal of phase to the output. Exceeding the negative

common-mode limit on both inputs will force the amplifier

output to a high state. In neither case does a latch occur

since raising the input back within the common-mode range

again puts the input stage and thus the amplifier in a normal

operating mode.

A feedback pole is created when the feedback around any

amplifier is resistive. The parallel resistance and capacitance

from the input of the device (usually the inverting input) to AC

ground set the frequency of the pole. In many instances the

frequency of this pole is much greater than the expected 3

dB frequency of the closed loop gain and consequenty there

is negligible effect on stability margin. However, if the feed-

back pole is less than approximately 6 times the expected 3

dB frequency a lead capacitor should be placed from the out-

put to the input of the op amp. The value of the added ca-

pacitor should be such that the RC time constant of this ca-

pacitor and the resistance it parallels is greater than or equal

to the original feedback pole time constant.

Exceeding the positive common-mode limit on a single input

will not change the phase of the output; however, if both in-

puts exceed the limit, the output of the amplifier will be forced

to a high state.

The amplifiers will operate with a common-mode input volt-

age equal to the positive supply; however, the gain band-

width and slew rate may be decreased in this condition.

When the negative common-mode voltage swings to within

3V of the negative supply, an increase in input offset voltage

may occur.

Each amplifier is individually biased to allow normal circuit

operation with power supplies of 3.0V. Supply voltages less

than these may degrade the common-mode rejection and re-

strict the output voltage swing.

www.national.com

Typical Applications

Battery Powered Strip Chart Preamplifier

DS009155-11

Runs from 9v batteries ( 9V supplies)

Fully settable gain and time constant

Battery powered supply allows direct plug-in interface to strip chart recorder without common-mode problems

→

“No FET” Low Power V F Converter

DS009155-12

Trim 1M pot for 1 kHz full-scale output

15 mW power drain

No integrator reset FET required

Mount D1 and D2 in close proximity

1% linearity to 1 kHz

www.national.com

Typical Applications (Continued)

High Efficiency Crystal Oven Controller

DS009155-13

T_control75˚C

•

A1’s output represents the amplified difference between the LM335 temperature sensor and the crystal oven’s temperature

A2, a free running duty cycle modulator, drives the LM395 to complete a servo loop

Switched mode operation yields high efficiency

% metal film resistor

Conventional Log Amplifier

DS009155-14

Tel Labs type Q81

Trim 5k for 10 µA through the 5k–120k combination

*1% film resistor

www.national.com

Typical Applications (Continued)

Unconventional Log Amplifier

DS009155-15

Q1, Q2, Q3 are included on LM389 amplifier chip which is temperature-stabilized by the LM389 and Q2-Q3, which act as a heater-sensor pair.

Q1, the logging transistor, is thus immune to ambient temperature variation and requires no temperature compensation at all.

www.national.com

Detailed Schematic

1/2 Dual

DS009155-16

Simplified Schematic

1/2 Dual

DS009155-3

www.national.com

Physical Dimensions inches (millimeters) unless otherwise noted

TO-5 Metal Can Package (H)

Order Number LF442AMH or LF442MH/883

NS Package Number H08A

www.national.com

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

Molded Dual-In-Line Package (N)

Order Number LF442ACN or LF442CN

NS Package Number N08E

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL

SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant

into the body, or (b) support or sustain life, and

whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

safety or effectiveness.

National Semiconductor

Corporation

Americas

Tel: 1-800-272-9959

Fax: 1-800-737-7018

Email: support@nsc.com

National Semiconductor

Europe

National Semiconductor

Asia Pacific Customer

Response Group

Tel: 65-2544466

Fax: 65-2504466

National Semiconductor

Japan Ltd.

Tel: 81-3-5639-7560

Fax: 81-3-5639-7507

Fax: +49 (0) 1 80-530 85 86

Email: europe.support@nsc.com

Deutsch Tel: +49 (0) 1 80-530 85 85

English Tel: +49 (0) 1 80-532 78 32

Français Tel: +49 (0) 1 80-532 93 58

Italiano Tel: +49 (0) 1 80-534 16 80

Email: sea.support@nsc.com

www.national.com

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

LF442AMH相关文章

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LF442AMH产品参数

型号:	LF442AMH
是否Rohs认证：	不符合
生命周期：	Transferred
零件包装代码：	BCY
包装说明：	METAL CAN-8
针数：	8
Reach Compliance Code：	not_compliant
ECCN代码：	EAR99
HTS代码：	8542.33.00.01
风险等级：	5.14
放大器类型：	OPERATIONAL AMPLIFIER
架构：	VOLTAGE-FEEDBACK
最大平均偏置电流 (IIB)：	0.00005 µA
25C 时的最大偏置电流 (IIB)：	0.00005 µA
最小共模抑制比：	80 dB
标称共模抑制比：	100 dB
频率补偿：	YES
最大输入失调电压：	1000 µV
JESD-30 代码：	O-MBCY-W8
JESD-609代码：	e0
低-偏置：	YES
低-失调：	NO
微功率：	YES
湿度敏感等级：	1
负供电电压上限：	-22 V
标称负供电电压 (Vsup)：	-20 V
功能数量：	2
端子数量：	8
最高工作温度：	125 °C
最低工作温度：	-55 °C
封装主体材料：	METAL
封装等效代码：	CAN8,.2
封装形状：	ROUND
封装形式：	CYLINDRICAL
峰值回流温度（摄氏度）：	NOT APPLICABLE
电源：	+-15 V
认证状态：	Not Qualified
最小摆率：	0.8 V/us
标称压摆率：	1 V/us
子类别：	Operational Amplifier
最大压摆率：	0.4 mA
供电电压上限：	22 V
标称供电电压 (Vsup)：	20 V
表面贴装：	NO
技术：	BIPOLAR
温度等级：	MILITARY
端子面层：	Tin/Lead (Sn/Pb)
端子形式：	WIRE
端子位置：	BOTTOM
处于峰值回流温度下的最长时间：	NOT APPLICABLE
标称均一增益带宽：	1000 kHz
最小电压增益：	50000
Base Number Matches：	1

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