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ADM1487JN Scheda tecnica(PDF) 8 Page - Analog Devices |
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ADM1487JN Scheda tecnica(HTML) 8 Page - Analog Devices |
8 / 8 page ADM1487 –8– Rev. PrC PRELIMINARY TECHNICAL DATA CMOS outout stages, which include parasitic diodes from their driver outputs to each supply rail and can latch up when these diodes conduct. V CC PA RA SITIC DIO DE D P PA RA SIT IC DIO DE DP S CH OTTKY REVERSE-BIA SED WH E N OUT P UT > V CC +V D SC HO TT K Y R EVE R SE-B IASED WHE N O U TP U T < G N D - V D Figure 9. ADM1487 Driver Output Stage The ADM1487 output includes Schottky diodes in series with the positive supply to the drain of the P-channel output device and in series with the drain of the N-channel output device. These diodes prevent the P-channel's parasitic diode from conducting when the output voltage exceeds VCC and prevent the N-channel's parasitic diode from conducting when the output voltage falls below ground. SLEW RATE CONTROL The driver output stage of the ADM1487 has a controlled slew rate to minmize signal reflections on incorrectly termi- nated lines and to reduce electromagnetic interference (EMI). CURRENT LIMIT AND THERMAL SHUTDOWN The ADM1487 incorporates two protection mechanisms to guard the drivers against short-circuits, bus contention or other fault conditions. The first is a current-limited output stage that protects the driver against short-circuits over the entire common-mode voltage range by limiting the output current to about 70mA. Under extreme fault condtions where the current limit is not effective, a thermal shutdown circuit puts the driver outputs into a high-impedance state if the die temperature exceeds 150°C, and does not turn them back on until the temperature has fallen to 130°C. ENHANCED ESD PROTECTION All Analog Devices parts incorporate protection against electrostatic discharge (ESD) to protect the devices dur- ing handling, assembly and normal operation. In addition, the ADM1487 has enhanced ESD protection up to ±10kV on the A and B I/O pins to protect against severe opera- tional conditions such as line transients, connection and disconnection. APPLICATION INFORMATION Figure 10 shows a typical application of the ADM1487. This is a half-duplex RS-485/RS-422 network. Up to 254 additional ADM1487s can be connected along the cable (termination resistors are only required at each end). Figure 10. Typical Half-Duplex RS-485/RS-422 Network OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Pin Plastic Dual-In-Line Package (N-8) 8 14 5 0. 43 0 (10 . 92 ) 0. 34 8 (8.84 ) 0. 28 0 (7.11 ) 0. 24 0 (6.10 ) PIN 1 SE A TI N G P L ANE 0. 02 2 (0.5 58 ) 0. 01 4 (0.3 56 ) 0. 06 0 (1. 52 ) 0. 01 5 (0. 38 ) 0.21 0 ( 5. 33 ) MA X 0.130 (3 .30 ) MIN 0.07 0 ( 1. 77 ) 0.04 5 ( 1. 15 ) 0.1 0 0 (2 .54 ) BS C 0. 16 0 (4.06 ) 0. 11 5 (2.93 ) 0. 32 5 (8. 25 ) 0. 30 0 (7. 62 ) 0. 01 5 (0. 3 81 ) 0. 00 8 (0. 2 04 ) 0. 19 5 (4. 95 ) 0. 11 5 (2. 93 ) 8-Pin SO Package (R-8) 85 4 1 0. 1968 (5. 00) 0. 1890 (4. 80) 0. 1574 (4. 00) 0. 1497 (3. 80) 0.24 4 0 (6 .20 ) 0.22 8 4 (5 .80 ) PI N 1 SE A TI N G P L ANE 0. 00 9 8 (0 .25 ) 0. 00 4 0 (0 .10 ) 0. 0192 (0. 49) 0. 0138 (0. 35) 0. 10 2 (2.59 ) 0. 09 4 (2.39 ) 0. 0500 (1 . 27 ) BS C 0. 0098 (0.25) 0. 0075 (0.19) 0. 05 0 0 (1 .27 ) 0. 01 6 0 (0 .41 ) 8 0 0. 0196 (0.50) 0. 0099 (0.25) x 4 5 100n DI D R 5 6 7 8 4 3 2 1 ADM1487 DE RO 100n +5V (VCC ) +5V (VCC) RT RT DATA IN (DI) RECEIVER OUTPUT (RO) 1 2 3 4 8 7 6 5 D R RECEIVER ENABLE ( RE) DRIVER ENABLE (DE) ADM1487 CABLE TERMINATED AT ENDS ADDITIONAL ADM1487s A B A B A B RE |
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