LMP8270,LMP8275 High Common Mode, Gain of 20, Precision Voltage Difference Amplifiers
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8270, LMP8275 are fixed gain differential ampli-
fiers 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 specifi-
cations 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 sys-
tems.
Features
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Typical Values, TA = 25藲C
Input Offset Voltage
1mV max
TCVos (LMP8270)
15碌V/藲C max
TCVos (LMP8275)
30碌V/藲C max
CMRR
80dB Min
Extended CMVR
-5V to 36V
Output Voltage Swing
Rail to Rail
Bandwidth
80KHz
Operating Temperature Range (Ambient) -40藲C to 125藲C
Operating Temperature Range (bare die) -40藲C to 150藲C
Supply Voltage
4.5V to 5.5V
Supply Current
1mA
Applications
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Fuel Injection Control
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Low Side Driver Configuration Current Sensing
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Power Management Systems
Typical Application
Typical Application: Low side Current Sensing
20130702
LMP
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is a trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS201307
www.national.com
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