Hello,
Please let me know about LM231A.
(1) Calculation of frequency accuracy
In the datasheet P.2, there is the convesion accuracy scale factor(gain) as +/-5% accuracy on the condition of figure16, Vin=^10V< Rs=14kohms.
Could you please let me know the calculation of this accuracy?
The freaquency accuracy is affected by the output current , the timer threshold voltage and arround components.
And the output current and the timer threshold voltage accuracy are greater than +/-5%.
I think that the frequency output accuracy is greater than +/-5%.
And I can see the equation of frequency output from the datasheet P.9 figure 16.
In this equation, there are the "2.09V". What is this 2.09V?
(2) Common Mode Range of Input Comparator
Could you please let me know the common mode range of input comparator on the figure 15 schematics?
-0.2V ~ Vcc-2.0V is the specified on the figure 16. I would like to know the data on the figure15.
(3) Input voltage requirement
Currently, input voltage is varied about 2~5V with 2.5Hz.
Can LM231A respond this input signal?
If LM231A can't respond, please let me know recommend input signal frequency.
(4) a 47 ohms resistor in figure 15
Could you please let me know the reason o the excellent linearity by the 47ohm?
I couldn't understand the principle of this 47ohm effect.
Best Regards,
Ryuji Asaka
