5 4 3 2 1 REVISION HISTORY ECO REV __ 2 DESCRIPTION PRODUCTION APPROVED DATE CHRIS P. 09-30-15 V+OUT J1 R55 0 CS OUT4+ SCLK SDI 32 J11 C12 1uF C13 0.01uF SMA E12 C18 1uF C19 0.01uF U2 CCHD-575-25-100 1 2 EN-XO 3 VTUNE VCC EN OUT- GND OUT+ 6 5 4 R1 63.4 0805 0603 C23 OPT 13 15 17 16 14 OUT4- OUT4+ V+OUT 5 C6 0.1uF 4 3 R17 0 2 1 C10 0.1uF C11 0.1uF C14 0.1uF J5 R7 OPT OUT0+ E11 R10 OPT SMA GND J6 OUT0- C15 0.1uF C17 0.1uF J7 R11 OPT OUT1+ E9 R14 OPT SMA GND J8 OUT1SMA J9 R16 OPT OUT2+ E4 R18 OPT SMA GND J10 OUT2- 3.3V R19 0 SW1 EG1218 SYNCON R23 OPT 1 C37 1uF R51 4.99K 3.3V SYNCON 1 2 R53 OPT 3 4 2 CUSTOMER NOTICE 1B 1Y 2Y 2B GND 2A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 3 8 7 6 L8 FBMH1608HL331-T C71 0.1uF U1 LTC6951 LTC6951 - 1 TECHNOLOGY 2 SUFFIX -1 Fout = 2.5GHz 2.7GHz 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 ULTRALOW JITTER MULTI-OUTPUT CLOCK SYNTHESIZER WITH INTEGRATED VCO N/A SCALE = NONE 3.3V 5 ASSY A B KIM T. CHRIS P. SIZE 1. ALL RESISTORS ARE IN OHMS, 0402 2. ALL CAPACITORS ARE IN MICROFARADS, 0402. VCC 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. NOTE: UNLESS OTHERWISE SPECIFIED 1A * R12 280 D5 YELLOW SYNC U9 SN74LVC2G00DCU 1 R54 OPT C35 1uF B SMA R52 4.99k OFF C SMA V+BIAS 3 4 OUT3- V+BIAS E2 5 J4 V+BIAS STATUS D1 RED R26 49.9 SMA E3 GND SMA V+BIAS E1 J13 SYNC 6 C21 1uF R24 OPT R6 OPT SMA V+BIAS R22 OPT SMA A 7 R15 330 C36 OPT REF+ 8 STATUS C2 820pF 0603 3.3V C20 OPT R20 OPT C4 0.1uF R13 1k C16 0.1uF R25 200 J12 V+OUT OUT3+ E10 V+BIAS V+XO B C22 10uF 1206 OUT2- GND 9 2 L2 FBMH1608HL331-T CS V+VCO CI2 OPT 0805 3.3V_REF V+D OUT2+ L1 0 ohm CP 1.2nF 0603 19 BVCO R9 10 RZ 63.4 CI1 0603 68nF 0603 REF- REF+ C9 0.01uF V+OUT 33 5V C8 1uF GND J3 R5 OPT V+BIAS GND 31 L9 R8 FBMH1608HL331-T 0 C REF- 30 OUT1- V+CP 5V 1uF OUT1+ CMA GND C7 CMB 11 10 41 29 V+OUT 40 28 CMC SYNC 27 OUT0- STAT 26 0603 V+OUT GND 39 25 C5 1uF 38 C30 1uF OUT3- C72 0.1uF 12 1 C31 1uF 2 C32 1uF OUT3+ OUT0+ REF+ C33 1uF D V+BIAS TB REF- C34 1uF OUT4SMA * TUNE 37 24 BB 36 23 V+REF 22 TUNE V+OUT U1 LTC6951 V+RF 35 21 C3 470nF 18 C1 0.01uF C29 C28 C27 C26 C25 C24 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0201 0201 0201 0201 0201 0201 SCLK 20 FBMH1608HL331-T SDI D J2 R3 0 R4 0 SDO L3 SDO CP V+OUT 3.3V 3.3V 34 R21 0 0603 SMA R2 OPT DATE: IC NO. REV. LTC6951IUHF DEMO CIRCUIT 2248A Wednesday, September 30, 2015 2 SHEET 1 1 OF 3 A 5 4 3 2 1 D D U3 DC590 SPI INTERFACE 3.3V NC7WZ17P6X R27 200K J14 HD2X7-079-MOLEX V+DIG 1 V+ 2 5V 6 CS 4 SCK/SCL 7 MOSI/SDA 5 MISO 10 EEVCC 9 EESDA 11 EESCL 12 EEGND 14 AUX SCLK SDI R28 100 3 4 R29 100 2 5 GND VCC 3.3V C38 CS SCLK 0.1uF SDO U4 NC7WZ17P6X 1 R31 200K U6 WP 4 2 5 1 C42 0.1uF R37 100 R36 0 0603 EEGND 3 GND VCC 3.3V U5 C40 0.1uF 4 ARRAY SCL SDA WP A2 A1 A0 EEPROM 24LC025-I /ST 6 5 7 3 2 1 R32 200K R30 100 6 SDI C C39 0.1uF 8 R35 4.99K VCC R34 4.99K GND R33 4.99K 13 8 GND 3 GND GND C CS 6 1 2 3.3V VCC(A) VCC(B) GND DIR 3 6 C41 0.1uF 5 4 SDO R38 200K B B 74LVC1T45GW NOTE: EEPROM FOR BOARD IDENTIFICATION CUSTOMER NOTICE 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A TECHNOLOGY KIM T. CHRIS P. TITLE: SCHEMATIC ULTRALOW JITTER MULTI-OUTPUT CLOCK SYNTHESIZER WITH INTEGRATED VCO SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 N/A SCALE = NONE 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only DATE: IC NO. REV. LTC6951IUHF DEMO CIRCUIT 2248A Wednesday, September 30, 2015 2 SHEET 1 2 OF 3 A 5 4 2 3.3V_REF U7 L4 FBMH1608HL331-T C43 10uF 1206 3 8 IN 7 C44 0.1uF OUT NC 6 5 ADJ NC BYP SHDN GND 1 2 R40 17.8K 3 4 C45 0.01uF R41 10K D C46 1uF 0603 + C47 330uF 10V 7343 1 3.3V_REF 1 2 3 3.3V_REF NC JP1 HD1X3-079 D LT1962EMS8 5V 5V NC 3.3V 5V 1 2 3 C48 330uF 10V 7343 + JP2 HD1X3-079 R39 280 C49 10uF 1206 3.3V_REF R44 31.6K R42 280 R45 10K 5V R43 619 10 18 13 12 11 6 5 C GND GND GND GND GND GND PWRGD2 BYP2 ADJ2 15 9 29 R47 0 0603 V+BIAS C54 OPT GND GND GND GND GND GND ADJ1 14 8 OUT2 7 OUT2 2 C55 OPT L6 FBMH1608HL331-T E6 C56 OPT 1206 E7 19 24 25 26 3 4 27 E8 C62 0.1uF PWRGD1 C61 10uF 1206 EP 23 J16 GND 16 17 IN2 IN2 20 21 IN1 IN1 L7 FBMH1608HL331-T 22 JACK BANANA C58 0.1uF BYP1 C57 10uF 1206 D4 5V GREEN LT3030EUFD 28 JACK BANANA C53 0.1uF SHDN2 C52 10uF 1206 6V - 9V J15 2 1 U8 C51 0.01uF SHDN1 2 1 OUT1 OUT1 E5 D3 1 3.3V_REF GREEN R46 1M L5 FBMH1608HL331-T 2 3.3V GREEN C65 OPT C D2 1 C50 0.01uF R48 1M B POWER SUPPLIES R49 17.4K 3.3V + C69 330uF 10V 7343 C64 OPT C66 OPT C67 OPT C70 10uF 1206 CUSTOMER NOTICE 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A C63 OPT TECHNOLOGY KIM T. CHRIS P. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. ULTRALOW JITTER MULTI-OUTPUT CLOCK SYNTHESIZER WITH INTEGRATED VCO 4 3 N/A SCALE = NONE 2 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 B 3.3V 3 2 1 JP3 HD1X3-079 C60 OPT GND R50 10K C68 OPT 3.3V NC C59 OPT V+REBIAS DATE: IC NO. REV. LTC6951IUHF DEMO CIRCUIT 2248A Wednesday, September 30, 2015 2 SHEET 1 3 OF 3 A