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LTC1344IG Datasheet(PDF) 8 Page - Linear Technology |
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LTC1344IG Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LTC1344 and B to ground C must be 150 Ω ±15Ω. For the generator termination, switches S1 and S2 are both on and the top side of the center resistor is brought out to a pin so it can be bypassed with an external capacitor to reduce common mode noise as shown in Figure 12. Any mismatch in the driver rise and fall times or skew in the driver propagation delays will force current through the center termination resistor to ground causing a high frequency common mode spike on the A and B terminals. The common mode spike can cause EMI problems that are reduced by capacitor C1 which shunts much of the com- mon mode energy to ground rather than down the cable. The LATCH Pin The LATCH pin (21) allows the select lines (M0, M1, M2 and DCE/DTE) to be shared with multiple LTC1344s, each with its own LATCH signal. When the LATCH pin is held low the select line input buffers are transparent. When the LATCH pin is pulled high, the select line input buffers latch the state of the Select pins so that changes on the select lines are ignored until LATCH is pulled low again. If the latch feature is not used, the LATCH pin should be tied to ground. APPLICATIONS INFORMATION A CABLE TERMINATION LOAD GENERATOR BALANCED INTERCONNECTING CABLE RECEIVER A ' 50 Ω 50 Ω 125 Ω B C B ' C ' 1344 F10 125 Ω 50 Ω 50 Ω Figure 10. Typical V.35 Interface Z Z Z S1 ON S2 ON 124 Ω LTC1344 V.35 RECEIVER A B C 1344 F11 51.5 Ω 51.5 Ω IZ –3V 3V 12V –7V –0.8mA 1mA VZ Figure 11. V.35 Receiver Using the LTC1344 low side. However, all of Linear Technology’s V.35 receiv- ers meet the RS485 input impedance specification as shown in Figure 11, which insures compliance with the V.35 specification when used with the LTC1344. The generator differential impedance must be 50 Ω to 150 Ω and the impedance between shorted terminals A S1 ON S2 ON 124 Ω LTC1344 V.35 DRIVER A B C 1344 F12 51.5 Ω 51.5 Ω C1 100pF Figure 12. V.35 Driver Using the LTC1344 |
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