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LTC2845CUHF Datasheet(PDF) 10 Page - Linear Technology |
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LTC2845CUHF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  10 LTC2845 sn2845 2845fs APPLICATIONS INFORMATION Overview The LTC2846/LTC2845 or LTC2847/LTC2845 form the core of a complete software-selectable DTE or DCE inter- face port that supports the RS232, RS449, EIA530, EIA530- A, V.35, V.36 or X.21 protocols. Cable termination is provided on-chip, eliminating the need for discrete de- signs. LTC2846 DTE LTC2846 DCE 2845 F09 D3 D3 R1 103 Ω 103 Ω 103 Ω R3 LTC2845 D3 D4 D2 R1 R2 R3 LL TM RI RL TXC RXC RXD TXD SCTE TXC RXC RXD SERIAL CONTROLLER D2 103 Ω SCTE R2 D1 103 Ω TXD R3 R1 D2 D1 LTC2845 R2 R1 R3 D2 D1 D4 D5 TXD SCTE TXC RXC RXD RTS DTR DCD DSR CTS LL TM RTS DTR DCD DSR CTS RTS DTR DCD DSR CTS LL TM RI RL RI RL SERIAL CONTROLLER R2 R4 D3 R4 R5 D5 R5 D1 Figure 9. Complete Multiprotocol Interface in EIA530 Mode A complete DCE-to-DTE interface operating in EIA530 mode is shown in Figure 9. The LTC2846 of each port is used to generate the clock and data signals. The LTC2845 is used to generate the control signals along with LL (Local Loop-Back), RL (Remote Loop-Back), TM (Test Mode) and RI (Ring Indicate). Cable termination is used only for the clock and data signals because they must support V.11 cable termination. The control signals do not need any external resistors. |
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