Company of American country semiconductor (National Semiconductor Corporation) announces to roll out amplifier of two brand-new high accuracy operation. Its characteristic is to have very low input voltage noise and taller accuracy, because this applies to the system that operates with low frequency and voltage of low power supply, for example industry with scientific research weight plan, pressure sensor and sensor of other low resistance.
Regard series of amplifier of high accuracy of LMP of American country semiconductor as medium fresh blood, newest the LMP7731 sheet that roll out is assembled as double as LMP7732 the input voltage noise that assembles amplifier of high accuracy operation has 2.9nV/sqrtHz only, corner of intermediate frequency noise is 3Hz only, and the voltage of peak value noise of 0Hz-10Hz also has 78nVpp only, because this can ensure the signal of place adjustment is accurate,do not have by accident, pass low frequency (be close to dc) the operation passes feeling system will lack fidelity decrease to least. Amplifier of these two brand-new operation of LMP high accuracy use engineering technology of VIP50 BiCMOS of proprietary of American country semiconductor to make. Be based on VIP50 engineering technology, american country semiconductor is able to design the low power amplifier with taller efficiency of the specific power consumption on amplifier of more high-powered high accuracy operation and market.
In addition, the accurate character of essence of life of LMP7731 and LMP7732 amplifier is supportable 16 or the data of above collects a system. When designing this kind of high resolution to spend data to collect a system, design an engineer normally according to imitate / the output that the value of full scale input of digital converter will come to decide sensor, ensure the system can develop highest sensitivity thereby.
The characteristic of amplifier of high accuracy of LMP7731/32 low noise
The LMP7731 that sheet assembles reachs amplifier of pair of assembly high accuracy of LMP7732 low voltage to have voltage of low noise, low deflection and course to be inputted to course / output (the character of RRIO) . Amplifier of these two operation all inside ambipolar input class and input bias voltage eliminate buy circuit, because this inputs electric current,can reduce to 1.5nA. In addition, these two chip can be operated inside the limits of power supply voltage in 1.8V ～ 5.5V, and dc deflection voltage has 40uV only, gain bandwidth is as high as 22MHz, power consumption is 2mA only. Because the gain bandwidth of these two amplifier is extremely tall, open loop gain more be as high as 130dB, because this can ensure the system with extremely high demand of closed circuit gain can be accurate,adjust signal.
Of LMP7731/32 operation amplifier in all the model is restrained than (CMRR) , power source is restrained than (PSRR) and gain of big signal voltage (AVOL) is as high as 120dB above, and drift of input deflection voltage (TCVOS) is low spend to every (centigrade) 1uV, because this can be in - the operation inside the capacious temperature limits of 125 ℃ of 40 ℃ ～ . LMP7731 chip uses the 5 SOT23 that cite a base to enclose, and LMP7732 chip uses the 8 SOIC that cite a base to enclose.
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