Descriptions:
The instrumentation amplifier module with AD620 as the core realizes differential amplification, single-ended ground-to-ground signal amplification, and AC weak signal amplification, which is convenient for single-chip microcomputer and PLC acquisition and analysis!
Features:
(suitable for millivolt MV level differential amplification)1>.AD620 is not a rail-to-rail input and output op amp, that is to say, with 5V power supply, the maximum output voltage is basically equal to 3.5V, AD620 is a common chip of high-precision instrumentation amplifier, it is a military-grade chip, which is more in the instrumentation amplifier circuit. Commonly used.2>.AD620s offset voltage is lower than the offset voltage of LM358, can effectively amplify the MV level signal as much as possible, especially the sensor with a small output voltage range (such as: 0-5MV cant be changed with LM358)
Module parameters:1>.the power supply voltage: If the 3-5V single-supply DC power supply (please connect the power supply to the low-voltage port to supply power to the board) If the 6-24V single-supply DC power supply (please connect the power supply to the wide voltage port to supply power to the board) Current output: maximum 15-20MA2>.input signal: front-end sensor analog signal introduction 2.1>.If the sensor or signal line (excluding the power supply and ground) has only one signal line, then it is a single-ended ground signal amplification, you can directly connect the signal line to B+, G to the common ground, and at the same time A - Shorted with G. 2.2>.If the sensor is a weighing or pressure strain gauge, the signal line is two, one is the signal is positive, the signal is negative, please connect the sensor output signal positive pin to INB, the signal negative reference The pin is connected to the INA, and the differential amplification is realized after zero adjustment. About zeroing:Short-circuit A- and B+, then adjust t