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Part Number: LM331
The customer needs to select a voltage-to-Frequency converter. His requirements are as below:
1. The power supply is 12V.
2. Convert 0~10KHZ to 0~10V.
The customer would like to verify if LM2917-N or LM331 can meet his requirements. If they cannot meet the customer's
requirements, would you recommend a suitable device and send me a TINA circuit? I think the customer needs to use
the double power supply to achieve his application, is my understand correct?
Best Wishes, Mickey Zhang Asia Customer Support Center Texas Instruments
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In reply to Mickey Zhang:
Precision Amplifier Applications - TI Tucson
In reply to Alexander Davis:
When I review all of TI's VFC products the LM331 is the best suited to meet the requirements you listed. Be sure to observe the input voltage polarity when applying the LM331 in either the datasheet 9.2.1 Basic V-F Converter circuit (0 to 10 V), or 9.2.2 Precision V-F Converter circuit (-10 V to 0 V).
We do not have a TINA model for the LM331.
Precision Amplifiers Applications
In reply to Thomas Kuehl:
Maybe you don't understand my quesiton,I need frequency to voltage converter,not voltage-to- frequency converter
My requirements are as below:
2. Convert 0~10KHZ frequency signal to 0~10V.analog signal;
I would like to verify if LM2917-N or LM331 can meet his requirements.
In reply to liu Qingfu:
The original post was regarding a voltage-to-frequency conversion and that is what I was responding to. Sorry for the confusion.
When I examine the datasheets for the LM331 and LM2907 it is clear that each one may be employed as a frequency-to-voltage converter despite their different designs. The LM331 datasheet circuit, Figure 18, "Simple Frequency-to-Voltage Converter" should meet your requirements. I am a bit concerned if it will be able to provide a 10 V maximum output with a 12 V supply. The datasheet doesn't provide details about how close internal nodes can swing to the supply limits so that might be an issue.
The LM2907 is useable as an F-V converter is well and eliminates the need for a differentiator at the input as required by an LM331 solution. Again, there might be an issue at the maximum output voltage regarding the internal node swing limits with a 12 V supply. You could try the 12 V supply and see if the performance meets your requirements. If not, you would have to increase Vcc.
Precision Amplifiers Applications Engineering
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