National Semiconductor LMP8270, LMP8275 Technical data

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LMP8270, LMP8275
High Common Mode, Gain of 20, Precision Voltage
Difference Amplifiers

LMP8270,LMP8275 High Common Mode, Gain of 20, Precision Voltage Difference Amplifiers

PRELIMINARY

January 2005

General Description

The LMP™8270, LMP8275 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 LMP8270,
LMP8275 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 20 and is
adequate to drive an ADC to full scale in most cases. The
LMP8270, LMP8275 have a preamplifier with a fixed gain of
10 and an amplifier with a fixed gain of 2, achieving overall
fixed gain of 20. The internal signal path between these two
stages is brought out on two pins, A1 and A2, which provide
a connection for a filter network.

The LMP8270, LMP8275 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 (LMP8270) 15µV/˚C max
n TCVos (LMP8275) 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

20130702

LMP™is a trademark of National Semiconductor Corporation.

© 2005 National Semiconductor Corporation DS201307 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.

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

S

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

S

(Note 3))

JA

5V Electrical Characteristics (Note 7)

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

Symbol Parameter Conditions Min Typ

(Note

V

OS

TC V

TC V

A2 I

I

S

Input Offset Voltage VCM= Vs/2

Input Offset Voltage Drift LMP8270

OS

Input Offset Voltage Drift LMP8275

OS

Input Bias Current of A2 (Note 5)

B

Supply Current 0.6

±

0.25 1.0 mV

±
±

1.0 1.2

TBD

R

CM

Input impedance Common

160 200 240 KΩ

Mode

R

DM

Input impedance Differential

320 400 480 KΩ

Mode

CMVR Input Common-Mode Voltage

LMP8270, LMP8275 High Common Mode, Gain of 20, 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

-2V≤V

PSRR Power Supply Rejection Ratio 4.5V≤V

≤ 27V

CM

≤ 36V

CM

≤ 27V f = 1KHz TBD dB

CM

≤ 27V f = 10KHz TBD

CM

≤ 5.5V TBD

S

80
80

TBD

R

F-INT

TCR

A

V

Filter Resistor 97 100 103 KΩ

Filter Resistor Drift TBD ppm/˚C

F-INT

Total Gain 20 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

4)

6

6

Max Units

±

15 µV/˚C

±

30 µV/˚C

±

20 µA

TBD

±

1%

±

25 ppm/˚C

mA

dB

dB

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