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RS232 line driver wthout charge pumps?

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blapcb

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I use a MAX3232 for driving the RS232 line but it uses a charge pump that places a sawtooth wave on the power rail. Do all line drivers use charge pumps? Is there a better choice? (logic is 3.3v)
 

sabeti_1990

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hi
can U use rs485 instate of 232 it's look like better in noise
 

alexxx

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blapcb said:
I use a MAX3232 for driving the RS232 line but it uses a charge pump that places a sawtooth wave on the power rail.
Can you post your schematic and measured waveforms? Are you using decoupling capacitors?
 

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