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參數(shù)資料
| 型號： | VFC100AG |
| 英文描述： | Synchronized VOLTAGE-TO-FREQUENCY CONVERTER |
| 中文描述： | 同步電壓頻率轉(zhuǎn)換器 |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 205K |
| 代理商： | VFC100AG |
VFC100
4
THEORY OF OPERATION
The VFC100 monolithic voltage-to-frequency converter pro-
vides a digital pulse train output with an average frequency
proportional to the analog input voltage. The output is an
active low pulse of constant duration, with a repetition rate
determined by the input voltage. Falling edges of the output
pulses are synchronized with rising edges of the clock input.
Operation is similar to a conventional charge balance VFC.
An input operational amplifier (Figure 1) is configured as an
integrator so that a positive input voltage causes an input
current to flow in R
IN
. This forces the integrator output to
ramp negatively. When the output of the integrator crosses
the reference voltage (5V), the comparator trips, activating
the clocked logic circuit. Once activated, the clocked logic
awaits a falling edge of the clock input, followed by a rising
edge (see Figure 2). On the rising edge, switch S
1
is closed
for one complete clock cycle, causing the reset current, I
1
, to
switch to the integrator input. Since I
1
is larger than the input
current, I
IN
, the output of the integrator ramps positively
during the one clock cycle reset period. The clocked logic
circuitry also generates a VFC output pulse during the reset
period.
Unlike conventional VFC circuits, the VFC100 accurately
derives its reset period from an external clock frequency.
This eliminates the critical timing capacitor required by
other VFC circuits. One period (from rising edge to rising
edge) of the clock input determines the integrator reset
period.
When the negative-going integration of the input signal
crosses the comparator threshold, integration of the input
signal will continue until the reset period can start (awaiting
REFERENCE VOLTAGE vs REFERENCE LOAD CURRENT
Output Current (mA)
0
5.01
5
4.99
4.98
4.97
4.96
V
5
10
15
20
25
30
Short Circuit
Current Limit
QUIESCENT CURRENT vs TEMPERATURE
Ambient Temperature (°C)
25
–75
–50
–25
0
50
75
100
125
20
15
10
5
0
S
+I
CC
–I
CC
TYPICAL PERFORMANCE CURVES
At +25
°
C,
±
V
CC
= 15VDC, and in circuit of Figure 1.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VFC100BG | Synchronized VOLTAGE-TO-FREQUENCY CONVERTER |
| VFC101 | Synchronized VOLTAGE-TO-FREQUENCY CONVERTER |
| VFC101JN | Synchronized VOLTAGE-TO-FREQUENCY CONVERTER |
| VFC101KN | Synchronized VOLTAGE-TO-FREQUENCY CONVERTER |
| VFC110 | High-Frequency VOLTAGE-TO-FREQUENCY CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VFC100BG | 制造商:BB 制造商全稱:BB 功能描述:Synchronized VOLTAGE-TO-FREQUENCY CONVERTER |
| VFC101 | 制造商:BB 制造商全稱:BB 功能描述:Synchronized VOLTAGE-TO-FREQUENCY CONVERTER |
| VFC101JN | 制造商:BB 制造商全稱:BB 功能描述:Synchronized VOLTAGE-TO-FREQUENCY CONVERTER |
| VFC101KN | 制造商:BB 制造商全稱:BB 功能描述:Synchronized VOLTAGE-TO-FREQUENCY CONVERTER |
| VFC110 | 制造商:BB 制造商全稱:BB 功能描述:High-Frequency VOLTAGE-TO-FREQUENCY CONVERTER |
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