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LMP8270MA-LMP8270MAX
Precision Amplifiers [Preliminary]
LMP8270, LMP8275
High Common Mode, Gain of 20, Precision Voltage
Difference Amplifiers
General DescriptionThe LMP™8270, LMP8275are fixed gain differential ampli-
fiers witha -2Vto 27V input common mode voltage range
anda supply voltage rangeof 4.5Vto 5.5V. The LMP8270,
LMP8275 are precision amplifiers whichwill detect, amplify
and filter small differential signalsin the presenceof high
common mode voltages. The gainis fixedat20 andis
adequateto drivean ADCtofull scalein most cases. The
LMP8270, LMP8275 havea preamplifier witha fixed gainof andan amplifier witha fixed gainof2, achieving overall
fixed gainof20. The internal signal path between these two
stagesis broughtouton two pins,A1 and A2, which provide connectionfora filter network.
The LMP8270, LMP8275will function with reduced specifi-
cations over the extended common mode input voltage
rangeof-5to36 Volts. This feature makes the device
suitablefor applications with load dumpin automotive sys-
tems.
Features Typical Values,TA= 25˚C Input Offset Voltage 1mV max TCVos (LMP8270) 15µV/˚C max TCVos (LMP8275) 30µV/˚C max CMRR 80dB Min Extended CMVR -5Vto 36V Output Voltage Swing Railto Rail Bandwidth 80KHz Operating Temperature Range (Ambient) -40˚Cto 125˚C Operating Temperature Range (bare die) -40˚Cto 150˚C Supply Voltage 4.5Vto 5.5V Supply Current 1mA
Applications Fuel Injection Control Low Side Driver Configuration Current Sensing Power Management Systems
Typical Application
Typical Application: Low side Current SensingPRELIMINARY
January 2005
LMP8270,LMP8275
High
Common
Mode,
Gain
20,
Precision
oltage
Difference
Amplifiers
