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Published:2014/3/25 21:33:00 Author:lynne | Keyword: Voltage frequency conversion composed MPX2100 circuit diagram, MPX2100 | From:SeekIC

Voltage frequency conversion power
Figure is constituted by the voltage frequency conversion circuit MPX2100 . The circuit consists of a voltage amplification and frequency conversion of two parts, by a 4 op amp and a few resistors amplifier circuit , which has differential mode gain and high common-mode rejection ratio , and high input impedance, you can adjust the bias circuit. Differential amplifier circuit is mainly done by A1, A2 op amp feedback circuit is used to prevent the inflow of sensor negative side . At zero pressure, the difference between the voltage of the sensor between 2 feet and 4 feet to zero . If 2 feet and 4 feet each common-mode voltage 4V ( half the supply voltage sensor ), the A1 is a pin voltage is also 4V, so that the voltage through the A3 and A4 road to its output voltage is zero pressure . Zero pressure offset introduced by the output of R4 and R12, R12 can be set to adjust the bias voltage. By R7 choose from 13 feet to see past impedance , typically 1kΩ. Amplifier gain AV = R5 [1 + (R11/R10)] / R6 = 125. Select a gain of 125 allows the sensor full scale output swing amplified when 32mV to 4V swing .A3 output terminal voltage of 0.5 ~ 4.5V after by V / F conversion to the output frequency 1 ~ 10kHz . A3 8 feet and AD654V / F converter is connected . Its full- scale output frequency is determined by R3, R13 and C3, and can be calculated according to the following formula :Fout ( Full Scale ) = Vin / [10 (R3 + R15) C3]

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