LMP8272

www.DataSheet4U.com LMP8272,LMP8277 High Common Mode, Gain of 14, Precision Voltage Difference Amplifiers PRELIMINARY January 2005 LMP8272, LMP8277 High Common Mode, Gain of 14, Precision Voltage Difference Amplifiers General Description The LMP™8272, LMP8277 are fixed gain differential amplifiers 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 specifications 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 systems. Features n n n n n n n n n n n n Typical Values, TA = 25˚C Input Offset Voltage 1mV max TCVos (LMP8272) 15µV/˚C max TCVos (LMP8277) 30µV/˚C max CMRR 80dB 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 Cur...