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LT1791AHS-PBF Datasheet(PDF) 11 Page - Linear Technology |
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LT1791AHS-PBF Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page LT1785/LT1785A/ LT1791/LT1791A 11 178491fb APPLICATIONS INFORMATION Slew Limiting for EMI Emissions Control The LT1785/LT1791 feature controlled driver output slew rates to control high frequency EMI emissions from equip- ment and data cables. The slew limiting limits data rate operation to 250kbaud. Slew limiting also mitigates the adverse affects of imperfect transmission line termina- tion caused by stubs or mismatched cable. In some low speed, short distance networks, cable termination may be eliminated completely with no adverse effect on data transmission. Data Network Cable Selection and Termination Long distance data networks operating at high data trans- mission rates should use high quality, low attenuation cable with well-matched cable terminations. Short distance networks at low data rates may use much less expensive PVC cable. These cables have characteristic impedances as low as 72Ω. The LT1785/LT1791 output drivers are guaranteed to drive cables as low as 72Ω. Figure 9. Full-Duplex RS422 5 4 3 2 A B Z Y 12 11 10 9 RO RE DE DI 178591 F09 TX 120Ω 5 4 3 2 A B Z Y 12 11 10 9 RO LT1791 LT1791 RE DE DI RX TX 120Ω RX |
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