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LTC1520 Datasheet(PDF) 10 Page - Linear Technology |
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LTC1520 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 18 page  LTC2859/LTC2861 10 285961fc Driver The driver provides full RS485 and RS422 compatibility. When enabled, if DI is high, Y-Z is positive for the full duplex device (LTC2861) and A-B is positive for the half- duplex device (LTC2859). When the driver is disabled, both outputs are high- impedance. For the full duplex LTC2861, the leakage on the driver output pins is guaranteed to be less than 10µA over the entire common mode range of –7V to +12V. On the half-duplex LTC2859, the impedance is dominated by the receiver input resistance, RIN. Driver Overvoltage and Overcurrent Protection The driver outputs are protected from short circuits to any voltage within the Absolute Maximum range of (VCC –15V) to +15V. The maximum current in this condition is 250mA. If the pin voltage exceeds about ±10V, current limit folds back to about half of the peak value to reduce overall power dissipation and avoid damaging the part. The LTC2859/LTC2861 also feature thermal shutdown protectionthatdisablesthedriver,terminator,andreceiver in case of excessive power dissipation. SLO Mode: Slew Limiting for EMI Emissions Control TheLTC2859/LTC2861featurealogic-selectablereduced- slew mode (SLO mode) that softens the driver output edges to control the high frequency EMI emissions from equipment and data cables. The reduced slew rate mode is entered by taking the SLO pin low, where the data rate is limited to about 250kbps. Slew limiting also mitigates the adverse effects of imperfect transmission line termination caused by stubs or mismatched cables. Figures 8a and 8b show the LTC2861 driver outputs in normal and SLO mode with their corresponding frequency spectrums operating at 250kbps. SLO mode significantly reduces the high frequency harmonics. Figure 8a. Driver Output in Normal Mode Driver Output at 125kHz into 100Ω Resistor Frequency Spectrum of the Same Signal Figure 8b. Driver Output in SLO Mode Driver Output at 125kHz into 100Ω Resistor Frequency Spectrum of the Same Signal applicaTions inFormaTion 285961 F08a Y, Z Y–Z 2µs/DIV 1V/DIV Y–Z 1.25MHz/DIV 10dB/DIV 285961 F08b Y, Z Y–Z 2µs/DIV 1V/DIV Y–Z 1.25MHz/DIV 10dB/DIV |
Similar Part No. - LTC1520 |
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Similar Description - LTC1520 |
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