5 4 3 2 1 REVISION HISTORY VCC ECO REV __ I+OUT l-OUT J4 J3 C25 OPT APPROVED PRODUCTION SUNNY H. DATE 01-27-2012 Q-OUT Q+OUT C24 OPT DESCRIPTION 3 J5 J6 D D R9 100 C23 OPT C29 1uF R1 0 0805 C1 OPT OPTIONAL LOW PASS FILTER VCTRL R4 0 0805 C4 OPT L3 L4 0 0805 0 0805 C7 OPT R8 OPT R7 OPT C26 OPT OPTIONAL LOW PASS FILTER C8 OPT REF IP2I IP2Q DCOI DCOQ GND E7 C3 OPT R14 100 C30 1uF 0 0805 C6 R6 OPT OPT R5 OPT C22 1uF L2 E1 E6 E2 E3 E4 C E5 C10 0.1uF 11 12 3 C34 0.1uF 4 5 6 0 Ohm J1 21 19 CMI LO- U1 IP2I LO+ RF GND EN L6 1.2pF C17 OPT 20 VCAP DCOI 7 C18 RF -Q DCOQ C35 0.1uF B CMQ GND GND GND T1 4:1 XFMR ANAREN BD0826J50200A00 C36 1000pF 18 C12 L5 1.0pF 0 Ohm LO 17 3 C28 OPT 16 15 C27 OPT C37 1000pF 14 13 25 1 2 6 4 5 J2 C14 OPT C13 5.1nH EIP2 10 C11 0.1uF 12 9 +Q 2 EDC 8 VCC 7 LTC5585IUF IP2Q 11 1 10 6 22 5 C33 0.1uF -I 4 +I 2 3 24 1 23 C31 0.1uF VBIAS C32 0.1uF GND JP1 9 PT5 PT4 PT3 PT2 PT1 500 Ohm 500 Ohm 500 Ohm 500 Ohm 500 Ohm REF 1.0 V R2 R3 0 0 0805 0805 8 C R13 100 C2 OPT L1 0 0805 C5 OPT VCTRL R11 100 C21 1uF C19 5.1nH VCC C9 OPT 0603 R16 OPT EN C15 1000pF C16 4.7uF 0805 R15 1 Ohm EDC E8 V SUPPLY E11 0805 4.95V - 5.45V E13 E10 A CUSTOMER NOTICE 2. INSTALL SHUNTS AS SHOWN. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 1. ALL RESISTORS ARE IN OHMS, 0402 ALL CAPACITORS ARE IN MICROFARADS, 0402 4 3 TECHNOLOGY A.K.. SUNNY H. TITLE: SCHEMATIC SIZE N/A SCALE = NONE 2 DATE: IC NO. VCC SENSE GND E12 NOTE: UNLESS OTHERWISE SPECIFIED B EIP2 E9 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only WIDEBAND I/Q DEMODULATOR With IIP2 and DC Offset Control LTC5585IUF REV. 3 DEMO CIRCUIT 1662A Monday, February 13, 2012 SHEET 1 1 OF 1 A