1 2 3 4 5 6 7 8 A A C7 VCC 0.01uF C6 100pF J2 DCout B R3 0 1 VCC 2 EN 3 Dcout 4 PP1 Csq 8 RFin 7 PP4 6 PP2 5 R2 2.2nH J1 RFin 1 C2 0.01uF R1 68 C1 1.5pF B 9 5 4 3 2 C4 (Opt.) 1 1 E1 C3 0.01uF 2 3 4 5 1 E2 GND U1 LT5581EDDB EN C5 (Opt.) VCC 2.7V - 5.3V VCC GND 1 E3 GND 1 E4 C C LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY Customer Notice D NOTES : unless otherwise specified 1 2 3 LINEAR TECHNOLOGY CORPORATION 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 Technology Applications Engineering For Assistance. This Circuit Is Proprietary To Linear Technology And Supplied For Use With Linear Technology Parts. 4 5 1630 McCARTHY BLVD. MILPITAS, CA 95035 PHONE (408) 432-1900 Title Size A FAX (408) 434-0507 D LT5581EDDB, RF Power Detector Document Number Date: Wednesday, August 27, 2008 6 Rev A Demo Circuit 1314A 7 Sheet 1 of 8 1