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DC voltage to frequency converter(sine output)

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Hi everyone!

I'm trying to send the output of a temp sensor(LM35) into MATLAB(using Data Acquisition Toolbox), through my sound card(as an ADC). As you may know, sound cards block DC voltages, so I'll have to convert the DC voltage to frequency. I tried to use LM131 to do it, but the output is a pulse train which is not suitable for the sound card input(because of noise, high freq components,...).

How can I convert the DC voltage(from 100-500 mv) to a relatively pure sine wave(from say for example 100Hz to 5Khz)?

I appreciate your advice.
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