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LTC1345INW Datasheet(PDF) 7 Page - Linear Technology |
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LTC1345INW Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1345 Review of CCITT Recommendation V.35 Electrical Specifications V.35 is a CCITT recommendation for synchronous data transmission via modems. Appendix 2 of the recommen- dation describes the electrical specifications which are summarized below: 1. The interface cable is balanced twisted-pair with 80 Ω to 120 Ω impedance. 2. The transmitter’s source impedance is between 50 Ωand 150 Ω. 3. The transmitter’s resistance between shorted terminals and ground is 150 Ω ±15Ω. 4. When terminated by a 100 Ω resistive load, the terminal- to-terminal voltage should be 0.55V ±20%. 5. The transmitter’s rise time should be less than 1% of the signal pulse or 40ns, whichever is greater. 6. The common-mode voltage at the transmitter output should not exceed 0.6V. 7. The receiver impedance is 100 Ω ±10Ω. 8. The receiver impedance to ground is 150 Ω ±15Ω. 9. The transmitter or receiver should not be damaged by connection to earth ground, short-circuiting, or cross connection to other lines. 10. No data errors should occur with ±2V common-mode change at either the transmitter or receiver, or ±4V ground potential difference between transmitter and receiver. Cable Termination Each end of the cable connected to an LTC1345 must be terminated by either one of two electrically equivalent external Y or ∆ resistor networks for proper operation. The Y-termination has two series connected 50 Ω resistors and a 125 Ω resistor connected between ground and the center tap of the two 50 Ω resistors as shown in Figure 6A. Figure 6. Y and ∆ Termination Networks 50 Ω 50 Ω 125 Ω A LTC1345 • F06 300 Ω 300 Ω 120 Ω B The alternative ∆-termination has a 120Ω resistor across the twisted wires and two 300 Ω resistors between each wire and ground as shown in Figure 6B. Standard 1/8W, 5% surface mount resistors can be used for the termination network. To maintain the proper differential output swing, the resistor tolerance must be 5% or less. A termination network that combines all the resistors into an SO-14 package is available from: BI Technologies (Formerly Beckman Industrial) Resistor Networks 4200 Bonita Place Fullerton, CA 92635 Phone: (714) 447-2357 FAX: (714) 447-2500 Part #: BI Technologies 627T500/1250 (SOIC) 899TR50/125 (DIP) APPLICATIO S I FOR ATIO |
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