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MAX1480ECCPI Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX1480ECCPI Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 19 page ±15kV ESD-Protected, Isolated RS-485/RS-422 Data Interfaces ______________________________________________________________________________________ 11 MAX1480EC/MAX1490EB: Reduced EMI and Reflections The MAX1480EC/MAX1490EB are slew-rate-limited, minimizing EMI and reducing reflections caused by improperly terminated cables. Figure 11 shows both the driver output waveform of a MAX1480EA/ MAX1490EA transmitting a 150kHz signal and the Fourier analysis of that waveform. High-frequency har- monics with large amplitudes are evident. Figure 12 shows the same information for the slew-rate-limited MAX1480EC/MAX1490EB transmitting the same signal. The high-frequency harmonics have much lower ampli- tudes, and therefore the potential for EMI is significantly reduced. Driver Output Protection There are two mechanisms to prevent excessive output current and power dissipation caused by faults or by bus contention. A foldback current limit on the output stage provides immediate protection against short cir- SHIELD (OPTIONAL) EXTERNAL RS-485/RS-422 WIRING A RL RL B Z Y RL RL R3* R4* R5, 100 Ω SH1 SH2 R1* R2* R6, 100 Ω DI ´ VIN +5V C1 22 µF C2 0.1 µF LOGIC GROUND ISOLATION BARRIER ISOLATED COMMON DRIVER INPUT RECEIVER OUTPUT DI RO 74HC86 OR EQUIVALENT MAX845 N MAX1490EA: MAX490E MAX1490EB: MAX488E ISO DI DRV ISO RO DRV A B Z Y D R N Q Q T F/F VCC3 FS OSC 1.07MHz/ 1.45MHz SD GND1 D2 D1 SHIELD (OPTIONAL) NOTE: RESISTORS R5 AND R6 PROTECT THE MAX1490EA/MAX1490EB FROM TRANSIENT CURRENTS BETWEEN SHIELD AND TRANSMISSION LINES. TWISTED PAIR TO OTHER TRANSCEIVERS TERMINATING RESISTOR (ONE RESISTOR ON EACH END) TWISTED PAIR TO OTHER TRANSCEIVERS 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 AC1 (MAKE NO CONNECTION) AC2 (MAKE NO CONNECTION) ISO VCC1 ISO RO DRV D2 D1 VCC2 VCC1 A B Z Y VCC3 SD FS GND1 16 15 14 13 9 10 11 12 ISO COM1 ISO DI DRV ISO VCC2 ISO RO LED GND2 R0 VCC4 DI MAX1490EA/ MAX1490EB *SEE TABLE 2. 270 pF 4kV Figure 2. MAX1490EA/MAX1490EB Detailed Block Diagram and Typical Application Circuit Table 2. Pullup and LED Drive Resistors for Figure 2 MAX1490EB 200 3000 330 3000 1000 330 1000 200 MAX1490EA R4 ( Ω) R3 ( Ω) R2 ( Ω) R1 ( Ω) PART |
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