MAX3222CUP+T中文资料(11)

Transceivers Using Four 0.1µF External Capacitors

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232

Figure 6. MAX3241 Loopback Test Result at 120kbps

Figure 5. Loopback Test Circuit

High Data Rates

The MAX3222/MAX3232/MAX3241 maintain the RS-232±5.0V minimum transmitter output voltage even at highdata rates. Figure 5 shows a transmitter loopback testcircuit. Figure 6 shows a loopback test result at120kbps, and Figure 7 shows the same test at 235kbps.For Figure 6, all transmitters were driven simultaneouslyat 120kbps into RS-232 loads in parallel with 1000pF.For Figure 7, a single transmitter was driven at 235kbps,and all transmitters were loaded with an RS-232 receiverin parallel with 1000pF.

The MAX3237 maintains the RS-232 ±5.0V minimumtransmitter output voltage at data rates up to 1Mbps.Figure 8 shows a loopback test result at 1Mbps withMBAUD = VCC. For Figure 8, all transmitters wereloaded with an RS-232 receiver in parallel with 250pF.

Figure 8. MAX3237 Loopback Test Result at 1000kbps(MBAUD = VCC)

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11

MAX3222/MAX3232/MAX3237/MAX3241

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