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MAX3293 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX3293 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 11 page Reduced EMI and Reflections (MAX3293/MAX3294) The MAX3293/MAX3294 are slew-rate limited, minimiz- ing EMI and reducing reflections caused by improperly terminated cables. Figure 12 shows Fourier analysis of the MAX3295 transmitting a 125kHz signal. High-fre- quency harmonics with large amplitudes are evident. Figure 13 shows the same information, but for the slew- rate-limited MAX3293, transmitting the same signal. The high-frequency harmonics have much lower ampli- tudes, and the potential for EMI is significantly reduced. To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. The slew-rate-limited MAX3293 and MAX3294 are more tolerant of imperfect termination. Driver-Output Protection Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. The first, a foldback current limit on the output stage, provides immediate protection against short circuits over the whole common-mode voltage range (see the Typical Operating Characteristics). The second, a thermal-shut- down circuit, forces the driver outputs into a high-imped- ance state if the die temperature exceeds +160°C. 20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters 10 ______________________________________________________________________________________ Figure 12. Driver-Output Waveform and FFT Plot of MAX3295 Transmitting a 125kHz Signal Figure 13. Driver-Output Waveform and FFT Plot of MAX3293 Transmitting a 125kHz Signal DRIVER-OUTPUT WAVEFORM AND FFT PLOT OF MAX3293 10dB/div Chip Information PROCESS: BiCMOS DRIVER-OUTPUT WAVEFORM AND FFT PLOT OF MAX3295 10dB/div VCC Z DE 16 Y + 5 GND DI MAX3293 MAX3294 MAX3295 SOT23-6 TOP VIEW 2 34 Pin Configuration Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 6 SOT23 U6CN+2 21-0058 90-0175 |
Similar Part No. - MAX3293_11 |
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Similar Description - MAX3293_11 |
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