National Semiconductor LMP8272, LMP8277 Technical data

查询LMP8272供应商

LMP8272, LMP8277 High Common Mode, Gain of 14, Precision Voltage Difference Amplifiers

LMP8272,LMP8277 High Common Mode, Gain of 14, Precision Voltage Difference Amplifiers

PRELIMINARY

January 2005

General Description

The LMP™8272, LMP8277 are fixed gain differential amplifiers with a -2V to 27V input common mode voltage range and a supply voltage range of 4.5V to 5.5V. The LMP8272, LMP8277 are precision amplifiers which will detect, amplify and filter small differential signals in the presence of high common mode voltages. The gain is fixed at 14 and is adequate to drive an ADC to full scale in most cases. This fixed gain is achieved in two separate stages, a pre-amplifier with gain of +7 and a second stage amplifier with a gain of +2. The internal signal path between these two stages is brought out on two pins that provide a connection for a filter network.

The LMP8272, LMP8277 will function with reduced specifications over the extended common mode input voltage range of -5 to 36 Volts. This feature makes the device suitable for applications with load dump in automotive systems.

Typical Application

Typical Application: Low side Current Sensing

Features

n Typical Values, TA = 25˚C n Input Offset Voltage 1mV max n TCVos (LMP8272) 15µV/˚C max n TCVos (LMP8277) 30µV/˚C max n CMRR 80dB Min n Extended CMVR -5V to 36V n Output Voltage Swing Rail to Rail n Bandwidth 80KHz n Operating Temperature Range (Ambient) -40˚C to 125˚C n Operating Temperature Range (bare die) -40˚C to 150˚C n Supply Voltage 4.5V to 5.5V n Supply Current 1mA

Applications

n Fuel Injection Control n Low Side Driver Configuration Current Sensing n Power Management Systems

20130901

LMP™is a trademark of National Semiconductor Corporation.

Absolute Maximum Ratings (Note 1)

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

ESD Tolerance (Note 2)

Junction Temperature (Note 3) +150˚C max

Soldering Information

Infrared or Convection (20 sec) 235˚C

Wave Soldering Lead Temp. (10

sec) 260˚C

Human Body Model

For input pins only

For All other pins

Machine Model 200V

Supply Voltage (V

- GND) 5.75V

4000V

2000V

Operating Ratings (Note 1)

Temperature Range (Note 3)

Packaged devices(Note 3) -40˚C to +125˚C

Bare Die Junction Temperature(Note

3) -40˚C to +150˚C

CMVR Continuous -5 to 42 Volts

Transient (300 ms) -TBD to 45 Volts

Storage Temperature Range -65˚C to +150˚C

Supply Voltage (V

Package Thermal Resistance (θ

8–Pin SOIC 190˚C/W

– GND) 4.5V to 5.5V

(Note 3))

5V Electrical Characteristics (Note 7)

Unless otherwise specified, all limits guaranteed for TA= 25˚C, VS= 5V, GND= 0, -2V≤VCM≤27V. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min Typ

(Note

TC V

A2 I

Input Offset Voltage VCM= Vs/2

Input Offset Voltage Drift LMP8272

Input Offset Voltage Drift LMP8277

Input Bias Current of A2 (Note 5)

Supply Current 0.6

0.25 1.0 mV

± ±

1.0 1.2

TBD

Input impedance Common

160 200 240 KΩ

Mode

Input impedance Differential

320 400 480 KΩ

Mode

CMVR Input Common-Mode Voltage

LMP8272, LMP8277 High Common Mode, Gain of 14, Precision Voltage Difference Amplifier

Range

ECMVR Extended Common-Mode

Continuous -2 +27 V

-5 36 V

Voltage Range

DC CMRR

AC CMRR

DC Common Mode Rejection Ratio

AC Common Mode Rejection Ratio

-2V≤V

-5V≤V

-2V≤V

PSRR Power Supply Rejection Ratio 4.5V≤V

≤ 27V

≤ 36V

≤ 27V f = 1KHz TBD dB

≤ 27V f = 10KHz TBD

≤ 5.5V TBD

80 80

TBD

F-INT

TCR

Filter Resistor 97 100 103 KΩ

Filter Resistor Drift TBD ppm/˚C

F-INT

Total Gain 14 V/V

Gain Error

Gain Drift

A1 V

A1 Output Voltage Swing RL= 100KΩ on Output VOL 0.01 Volts

OUT

VOH 4.80

A2 V

A2 Output Voltage Swing RL= 100KΩ on Output VOL 0.01 Volts

OUT

VOH 4.80

SR Slew Rate (Note 6) 0.7 V/µs

BW Bandwidth 80 KHz

Max Units

15 µV/˚C

30 µV/˚C

20 µA

TBD

25 ppm/˚C

www.national.com 2

+ 3 hidden pages