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MAX485CSA Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX485CSA Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 19 page MAX483/MAX487/MAX488/MAX489: Reduced EMI and Reflections The MAX483 and MAX487–MAX489 are slew-rate limit- ed, minimizing EMI and reducing reflections caused by improperly terminated cables. Figure 12 shows the dri- ver output waveform and its Fourier analysis of a 150kHz signal transmitted by a MAX481, MAX485, MAX490, MAX491, or MAX1487. High-frequency har- monics with large amplitudes are evident. Figure 13 shows the same information displayed for a MAX483, MAX487, MAX488, or MAX489 transmitting under the same conditions. Figure 13’s high-frequency harmonics have much lower amplitudes, and the potential for EMI is significantly reduced. Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers _______________________________________________________________________________________ 9 R R Y Z VOD VOC RECEIVER OUTPUT TEST POINT 1kΩ 1kΩ S1 S2 VCC CRL 15pF DI DE 3V Y Z CL1 CL2 A B RO RE RDIFF VID OUTPUT UNDER TEST 500Ω S1 S2 VCC CL _________________________________________________________________Test Circuits Figure 4. Driver DC Test Load Figure 5. Receiver Timing Test Load Figure 6. Driver/Receiver Timing Test Circuit Figure 7. Driver Timing Test Load |
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