Part Number: THVD1452
I have a question about transmission distance of RS-485.
Is there a correlation for the transmission distance and Vcc voltage of THVD1452?Is the following recognition right?
Transmission distance(@Vcc=5V) > Transmission distance(@Vcc=3.3V)
Or, is it related to the signal level?
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In reply to Hao L:
Hello Itabi-san, Adding on to Hao's comment, you might be interested in this application note that presents some practical results with respect to the THVD1450 transmitting and various rates over different lengths of cabling: www.ti.com/.../slla431.pdf One thing to note is that while lower-frequency operation tends to be limited by the signal amplitude (by DC losses creased by the series resistance of the cabling), higher-frequency operation tends to be limited by timing concerns (e.g., the jitter that is introduced due to higher-frequency losses in the cabling distorting the signaling waveforms). Increasing the differential signaling amplitude will provide less of a benefit for these higher-speed links compared to the lower-speed ones. Best regards, Max
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