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SP304CS Datasheet(PDF) 11 Page - Sipex Corporation |
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SP304CS Datasheet(HTML) 11 Page - Sipex Corporation |
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11 / 12 page  87 Corporation SIGNAL PROCESSING EXCELLENCE SP304 CONFIGURATIONS IN LOOPBACK MODE One-Channel Full Duplex RS-232 & One-Channel Full Duplex RS-422 Opposite Drivers Two-Channel Full Duplex RS-422 RIB1 ROB1 TOB1 TIB1 RIA1 ROA1 TOA1 TIA1 RS-232 LINE DRIVERS RS-232 RECEIVERS SELECT A = 1 SELECT B = 0 LB = 0 (ACTIVE) TOA2 RIA2 TOB2 TIB2 RIB2 ROB2 RS-422 LINE DRIVER RS-422 RECEIVER RIA1 ROA1 TOA1 TIA1 RS-422 LINE DRIVERS RS-422 RECEIVERS SELECT A = 1 SELECT B = 1 LB = 0 (ACTIVE) TOA2 RIA2 RIB1 ROB1 RIB2 TOB1 TIB1 TOB2 RS-422 LINE DRIVERS RS-422 RECEIVERS nects the driver outputs to the corresponding receiver inputs, and switches the output pin to a high impedance from V EE to ground. Receiver outputs are left active for signal verification. During loopback, the receiver inputs are tied to ground via a 5k Ω pulldown resistor. The re- ceiver inputs can accept the full ±15V swings with no interference to the loopback function. |
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