LMP8271 Datasheet | National Semiconductor

Description The LMP™8271, LMP8276 are fixed gain differential amplifiers with a -2V to 27V input mon mode voltage range and a supply voltage range of 4.5V to 5.5V. The LMP8271, LMP8276 are precision amplifiers which will detect, amplify and filter small differential signals in the presence of high mon mode voltages. The gain is fixed at 20 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 +10 and a second stage amplifier with a gain of +2. The internal signal path is brought out on two pins that provide a connection for a filter network. The LMP8271, LMP8276 will function with reduced specifications over the extended mon mode input voltage range of -5 to 36 Volts. This feature makes the device suitable for applications with load dump in automotive systems. The midrail offset adjustment pin enables the user to utilize this device for bidirectional current sensing. This is achieved by adjusting an externally set voltage reference. Accurate bidirectional load current measurements are achieved when monitoring the output with respect to this reference voltage Features n n n n n n n n n n n n n Bidirectional Current Sense Capability Typical Values, TA = 25˚C Input Offset Voltage 1m V max TCVos (LMP8271) 15µV/˚C max TCVos (LMP8276) 30µV/˚C max CMRR 80d B Min Extended CMVR -5V to 36V Output Voltage Swing Rail to Rail Bandwidth 80KHz Operating Temperature Range (Ambient) -40˚C to 125˚C Operating Temperature Range (bare die) -40˚C to 150˚C Supply Voltage 4.5V to 5.5V Supply Current 1m A Applications n Fuel Injection Control n Low Side Driver Configuration Current Sensing n Power Management Systems Typical Application Typical Application: Low side Current Sensing LMP™ is a trademark of National Semiconductor Corporation. © 2005 National Semiconductor Corporation DS201308 .national. LMP8271, LMP8276 High mon Mode, Gain of 20, Bidirectional Precision Voltage Difference...