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參數(shù)資料
| 型號(hào)： | AN795 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Voltage-to-Frequency/Frequency-to-Voltage Converter |
| 中文描述： | Voltage-to-Frequency/Frequency-to-Voltage轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 1/15頁(yè) |
| 文件大小： | 281K |
| 代理商： | AN795 |
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AN795
DS00795A-page 1
2002 Microchip Technology, Inc.
Voltage-to-Frequency/Frequency-to-Voltage Converter
FIGURE 1:
Ratiometric measurement (analog division).
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.
Counter
Latch
V
1
Output = N
Reset
TC9400
V/F
N
One
Shot
TC9400
V/F
Latch
÷
V
2
One
Shot
V
1
V
2
TC9400
F/V
Speed
Sensor
(Optical or Magnetic)
Analog Display
DVM Display
RPM
RPM
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.
FIGURE 2:
RPM/speed indicator.
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