Datasheet > AN795

AN795

更新时间： 2024-09-16 04:06:19

品牌	Logo	应用领域
美国微芯 - MICROCHIP		转换器
页数	文件大小	规格书
15页	280K
描述
Voltage-to-Frequency/Frequency-to-Voltage Converter

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AN795 数据手册

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

TC9400

V/F

Counter

V₂

Reset

Latch

One

Shot

One

Shot

TC9400

V/F

V₁

V₂

Output = N

FIGURE 1: Ratiometric measurement (analog division).

RPM/SPEED INDICATOR

Flow rates and revolutions per second are nothing more than frequency signals, since they measure the number of events per time

period. Optical and magnetic sensors will convert these flows and revolutions into a digital signal which, in turn, can be converted to a

proportional voltage by the use of a frequency-to-voltage (F/V) converter. A simple voltmeter will then give a visual indication of the

speed.

Analog Display

RPM

Speed

Sensor

TC9400

DVM Display

F/V

(Optical or Magnetic)

RPM

FIGURE 2: RPM/speed indicator.

DS00795A-page 1

12 3 4 5 6 7...15

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