1 2 REVISION HISTORY This circuit is proprietary to Linear Technology and supplied for use with Linear Technology parts. Customer Notice: Linear Technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application, Component substitution and printed circuit board layout may significantly affect circuit performance or reliability. Contact Linear Applications Engineering for assistance. A T1OUT T2OUT TP1 U1 LTC2803CDHC/LTC2804CDHC TP2 TP3 TP4 R1IN 1 R2IN 2 R2IN T1OUT 3 T1OUT T2OUT 4 T2OUT R1IN T1IN 14 T2IN 13 1 JP1 1 VCC VL VDD MODE 11 C5 1uF 7 SW PS 10 0.22uF 8 GND CAP GND GND MODE H 9 R1OUT 2 JP5 TP9 R2OUT 2 TP10 17 1 T2IN TP11 1 R1 10K 2 1 R2 10K 2 C3 10uH C1 TP13 MODE 3 OFF 2 ON A T1IN 3 L JP2 PS TP14 PS 1uF VCC 2 0.22uF VEE TP8 RTS/CTS 6 1uF C6 OPT R2OUT 15 JP4 APPROVED 08/17/04 TD/RD C4 L1 TP5 16 12 C2 VCC R1OUT 1 5 TP6 VCC DATE PROTO LOOP BACK VCC VDD DESCRIPTION 2 R2IN REV 1 VEE R1IN ECO VCC VL TP7 1 JP3 TP15 LOGIC SUPPLY TP12 3 TP16 TP17 TP18 VL GND GND J1 B 1 2 3 4 5 6 7 8 9 DCD RD TD DTR SG DSR RTS CTS T1OUT R1IN R2IN T2OUT B UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 THIRD ANGLE PROJECTION CONTRACT NO. APPROVALS DRAWN MEI DATE 08/17/04 CHECKED TECHNOLOGY TITLE SCH, LTC2803CDHC/LTC2804CDHC, DUAL APPROVED ENGINEER DESIGNER RS232 TRANSCEIVER SIZE CAGE CODE DWG NO A DO NOT SCALE DRAWING 1 Tuesday, October 26, 2004 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 SCALE: NONE FILENAME: 827A-1.DSN 2 REV DC827A SHEET 1 1 OF 1