NJM4151(2003) 查看數據表（PDF） - Japan Radio Corporation
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NJM4151 Datasheet PDF : 10 Pages
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NJM4151
4. Comparison of Voltage-to-Frequency Application Circuits
Table 1 compares the VFC applications circuits for typical linearity, frequency offset, response time for a step input
from 0 to 10 volts, sign of input voltage, and whether the circuit will operate from a single positive supply or split supplies.
Linearity
Frequency Offset
Response Time
Input Voltage
Single supply
Split Supply
Figure 2
1%
+10Hz
135msec
+
yes
-
Table 1
Figure 3
0.2%
0
10msec
+
yes
-
Figure 4
0.05%
0
10msec
-
yes
yes
5. Frequency-to-Voltage Conversion
The NJM4151 can be used as a frequency-to-voltage converter. Figure 5 shows the single-supply FVC configuration.
With no signal applied, the resistor bias networks tied to pins 6 and 7 hold the input comparator in the off state. A negative
going pulse applied to pin 6 (or positive pulse to pin 7) will cause the comparator to fire the one-shot. For proper operation,
pulse width must be less than the period of the one-shot, T=1.1 ROCO. For a 5Vp-p square-wave input the differentiator
network formed by the input coupling capacitor and the resistor bias network will provide pulses which correctly trigger
the one-shot. An external voltage comparator such as the NJM311 of NJM2901 can be used to "square-up" sinusoidal
input signals before they are applied to the NJM4151. Also, the component values for the input signal differentiator and
bias network can be altered to accommodate square waves with different amplitudes and frequencies. The passive
integrator network RBCB filters the current pulses from the pin 1 output. For less output ripple, increase the value of CB.
Figure 5. Single Supply Frequency-to-Voltage Converter Figure 6. Precision Frequency-to-Voltage Converter
-6-
Ver.2003-12-09
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