AN795 데이터시트 PDF

AN795 기능

Voltage to Frequency / Frequency to Voltage Converter

Microchip

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AN795 Voltage-to-Frequency/Frequency-to-Voltage Converter Author: Michael O. Paiva, Microchip Technology, Inc. RATIOMETRIC MEASUREMENT (ANALOG DIVISION) One of the most difficult circuits to build is one which will divide one analog signal by another. Two voltage-to-frequency (V/F) converters can do such division with ease. The numerator is counted directly as a signal, while the denominator forms the time base. Latch V1 V2 TC9400 V/F TC9400 V/F ÷N One Shot Counter One Shot Reset Latch V Output = N 1 V2 FIGURE 1: Ratiometric measurement (analog division). RPM/SPEED INDICATOR Flow rates and revolutions per second are nothing m

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www.DataSheet4U.com AN795 13-BIT A/D CONVERTER A 13-bit binary A/D converter can be built by combining the TC9400 V/F converter with a counter, latch, and time base. When the V/F converter is set up for 10kHz full scale, a 1-second time base will provide one conversion per second. 1MΩ VIN TC9400 V/F 13-bit Binary Counter Gate Reset Time Base 13-bit Latch Latch FIGURE 7: 13-Bit A/D converter. Bit 12 1110 9 8 7 6 5 4 3 2 1 0 4-DIGIT VOLTMETER WITH OPTOISOLATED INPUT The use of a frequency counter will give a display of the V/F converter's frequency, which is directly proportional to the input voltage. When the V/F converter is running at 10kHz full scale, a 1-second time base will give 4-digit resolution with 1 reading per second. The optoisolator is used for transmitting the frequency, so there is no DC path to the frequency counter. This is especially useful in medical applications, where a voltage probe should not be directly connected to the human body. 1MΩ + VIN TC9400 V/F V+ Battery or Transformer Isolated Supply Frequency Counter FIGURE 8: 4-Digit voltmeter with optoisolated input. LONG-TERM INTEGRATOR WITH INFINITE HOLD This system will integrate an input signal for minutes or days, and hold its output indefinitely. The data is held in a digital counter and stays there until the counter is reset. Typical applications involve controlling the amount of surface metal deposited in a

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관련 데이터시트

부품번호	상세설명 및 기능	제조사
AN7900F	3-pin Negative Output Voltage Regulators 1A Type	Panasonic Semiconductor
AN7900F	3-pin Negative Output Voltage Regulators (1A Type)	Panasonic Semiconductor

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