LMP8272,LMP8277 High Common Mode, Gain of 14, Precision Voltage Difference Amplifiers
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8272, LMP8277 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 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 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 (LMP8272)
15碌V/藲C max
TCVos (LMP8277)
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
20130901
LMP
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is a trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS201309
www.national.com
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