5 4 3 2 1 REVISION HISTORY V+ GND D ECO CD4 10uF 1206 CD6 1uF 1206 D1 BAT54S 3 TP2 CD5 10uF 1206 CD7 1uF 1206 OPT V+ V+ CD1 0.1uF 0603 TP10 CSA OPT ZA2 OPT TP5 1 2 0 RA2 49.9 3 1.65K,0.1% R3 4 4.22K,0.1% 5 J1 GNDA RA3 49.9 GND J2 6 TP6 CD3 0.1uF 0603 TP4 7 8 ZB3 OPT LT1568CGN V+ U1 INVA SA V+ INVB SB OUTA OUTB OUTA OUTB GNDA GNDB NC EN V- V- B 15 R5 14 RB1 13 R4 2 3 JP1 1.54K,0.1% 11 TP12 CD8 0.1uF 0603 10 9 TP9 TP7 R1 5.11K 0603 3 B JP4 V- THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 49.9 RB2 VOUTB GNDB GND RB3 49.9 J4 VOUTB SHDN B R6 OPT 0603 APPROVALS TECHNOLOGY A.K. PHILIP K. 3 N/A SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC SIZE 5 C 0 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 1. ALL CAPACITORS AND RESISTORS ARE 0805 GND J3 CUSTOMER NOTICE NOTES: UNLESS OTHERWISE SPECIFIED, VINB GNDB 1 AB 2 1 DUAL SUPPLY TP8 3.83K,0.1% 12 V- SINGLE SUPPLY TP11 ZB1 OPT ZB2 OPT 16 CD2 0.1uF 0603 VCC ZB4 OPT CSB OPT ZA3 20K ZA1 82pF+/-5% RA1 A 01-21-15 OPT RN1 R2 VOUTA DATE PHILIP K. ZAB1 22pF+/-5% ZA4 OPT VOUTA APPROVED D CN1 V+ GND DESCRIPTION PRODUCTION RFF1 OPT VTP3 -2.7V to -6V C 2 2 TP1 V- VINA REV __ 1 V+ 2.7V to 6V DATE: 2 ACTIVE RC FILTER BUILDING BLOCK LT1568CGN IC NO. DEMO CIRCUIT 675B Wednesday, January 21, 2015 SHEET 1 1 REV. 2 OF 1 A