LMP8270 Datasheet, PDF (1/5 Pages) National Semiconductor (TI) – High Common Mode, Gain of 20, Precision Voltage Difference Amplifiers

PRELIMINARY
January 2005
LMP8270, LMP8275
High Common Mode, Gain of 20, Precision Voltage
Difference Amplifiers
General Description
The LMP™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
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
Typical Application
Typical Application: Low side Current Sensing
20130702
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© 2005 National Semiconductor Corporation DS201307
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