A B C D E REVISION HISTORY CS SDO SCLK SDI 2 J19 OPT E9 R37 330 J9 R39 330 1 0 R41 VCO- J15 C25 C38 OPT R40 150 6 C29 OPT 0603 3 GND 2 VTUNE 1 CPOUT E4 GND 16 R12 RZ_P 196 0603 V+OA OPT OPT 0603 OPT 0603 5 V+OA 6 C5 0805 0.1uF 1 4 7361 NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402 2. ALL CAPACITORS ARE IN MICROFARADS, 0402 A 8 -INB OUTB V+ U2 CP_A 0603 OPT 4 V- B A +INA 2 -INA 1 OUTA LT1678IS8 V+OA * B 18 19 20 17 GND V+ V+ V+ 22 23 21 LV/CM- LV/CM+ STAT1 V+P1 SYNC PECL1+ C6 0.1uF C3 20V R1 47uF 7343 4.99K R78 C56 R57 0 0.1uF OPT R77 C55 R52 0 0.1uF OPT R76 C54 R46 0 0.1uF OPT R75 C53 R42 0 0.1uF OPT R74 C52 GND PECL1- V+ V+P1 R31 0 0.1uF V+VCO V+P2 VCO+ PECL2+ VCO- PECL2- OPT R66 C51 V+VCO V+P2 R24 0 0.1uF V+ V+P3 GND PECL3+ V+CP PECL3- OPT R65 C50 CP V+P3 0 0.1uF OPT R64 C49 R21 0 0.1uF J17 PECL0+ J16 PECL0- J13 PECL1+ J12 PECL13 12 11 10 9 8 7 6 5 4 3 2 R22 1 J8 PECL2+ J7 PECL2- J11 PECL3+ J10 PECL3- 2 C67 C58 0.1uF R69 OPT 0603 R8 OPT C71 R6 OPT CP R16 0.1uF 49.9 C70 C57 R7 49.9 0.1uF R20 R19 OPT 100 R33 OPT R23 OPT R9 OPT V+ C40 J4 U9 4 5 6 OPT REF R17 OPT 0 OUT+ GND OUT- EN VCC VTUNE 3 2 1 EN-XO CCHD-575-25-100 V+XO C66 0.1uF R73 0 V+CP 3 OPT OPT 0603 + 47uF + C30 35V 7 +INB RZ_A OPT V+P0 13 CP_P 0.056uF 0603 R70 0 0603 R71 OPT 0603 1206 CI1_A OPT E7 E2 R72 0 0603 CI2_A 0603 J3 R67 GND 0 0603 R68 40 0603 R18 OPT 0603 38 39 CI1_P 0.1uF V+VCO 0603 V+CP 0.1uF 1206 + CPOUT C22 OPT C28 CI2_P 0.56uF CS 24 5 GND 7 14 34 35 0.1uF 0805 C23 47uF 35V 7361 33 100pF 4 GND GND 13 C24 2 32 37 GND GND 12 GND 31 R35 200K 36 U3 OPT RFOUT GND 11 GND 8 V+VCO GND GND 10 GND 15 V+VCO E16 9 VCC GND 30 C68 OPT E17 29 R29 49.9 150 OPT R32 100pF R25 STAT2 14 GND R43 4 PECL0- 16 15 49 OUT+ CVCSO-914-1000 SDI GND GND 28 V+P0 PECL0+ 48 OUT- 27 SCLK V+ EN 5 C72 U1 LTC6950IUHH V+ 47 VCC R36 OPT 37.4 26 V+REF 3 VTUNE 6 25 REF+ 2 OPT R28 49.9 46 E8 R38 OPT 45 1 R26 47uF 7361 REF- U4 R53 SML-010MT SML-010VT 44 V+VCXO C69 OPT OPT V+REF E5 C59 35V 0805 C27 0 43 EN E6 V+VCXO R44 0.1uF SDO C32 R55 0 V+ V+ R30 + V+VCXO OPT GND C26 OPT GND LVDS/CMOS- R60 OPT 41 J14 * VCO+ D2 RED 2 D1 GRN R56 0 42 SYNC J18 E10 1 SYNC DATE LVDS/CMOS+ R61 0 R62 E11 APPROVED MICHEL A. 03-28-14 2 STAT1 (LOK) DESCRIPTION PRODUCTION R63 0 4 3 REV __ * STAT2 (ERR) ECO 0603 0.1uF R2 4.99K CUSTOMER NOTICE THE LAYOUT FOOTPRINT FOR U4 AND U9 ACCEPTS MOST OSCILLATORS IN 9mm X 14mm OR 5mm X 7.5mm PACKAGE WITH EITHER FOUR OR SIX PINS. C 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. D KIM T. MICHEL A. TITLE: SCHEMATIC 1.4 GHZ LOW PHASE NOISE, LOW JITTER PLL WITH CLOCK DISTRIBUTION SIZE N/A SCALE = NONE TECHNOLOGY 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. LTC6950IUHH REV. 2 DEMO CIRCUIT 1795A 03/28/2014, 01:19 PM SHEET 1 E OF 2 1 A B C LTC6950 BYPASS AND BULK CAPACITORS V+ TO 5.25V E1 GND V+ = 3.15V - 3.45V 20V + 7343 E3 C41 0.1uF C61 0.1uF C62 0.1uF C63 0.1uF C64 0.1uF C65 0.1uF C73 0.1uF C74 0.1uF 4 C42 0.01uF 0201 C43 0.01uF 0201 C44 0.01uF 0201 C45 0.01uF 0201 C46 0.01uF 0201 C47 0.01uF 0201 C48 0.01uF 0201 C60 0.01uF 0201 C12 0.01uF 0201 C13 0.01uF 0201 C14 0.01uF 0201 C15 0.01uF 0201 C16 0.01uF 0201 C17 0.01uF 0201 C18 0.01uF 0201 C19 0.01uF 0201 V+ 20V + 7343 C8 1.0uF 0603 C7 47uF C4 0.01uF 0201 C9 0.01uF 0201 C10 0.01uF 0201 C11 0.01uF 0201 E20 U6 NC7WZ17P6X 3 V+ DC590 SPI INTERFACE R58 200K 1 6 R51 100 3 4 R54 100 2 SDO 3 GND VCC V+ 5 U7 NC7WZ17P6X R10 4.99K SCL SDA WP A2 A1 A0 WP EEGND 1 6 3 4 2 GND VCC 8 1 R79 100 C33 0.1uF 2 VCC(A) V+ 5 VCC(B) 6 DIR 5 GND 3 C36 CS SCLK 0.1uF R59 100 U8 74LVC1T45GW V+ 4 6 5 7 3 2 1 C31 0.1uF R14 200K VCC U5 24LC025-I /ST R13 200K GND R5 4.99K ARRAY R4 4.99K 13 8 GND 3 GND GND 1 V+ 2 5V 6 CS 4 SCK/SCL 7 MOSI/SDA 5 MISO 10 EEVCC 9 EESDA 11 EESCL 12 EEGND 14 AUX V+DIG CS SCLK SDI EEPROM J5 HD2X7-079-MOLEX 2 E V+ C2 1.0uF 0603 C1 47uF E21 J2 BNC GND C39 0.1uF V+CP J1 BNC 4 D V+ SDI C35 0.1uF 2 C34 0.1uF 4 SDO R11 0 0603 R15 200K 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 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 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A B C TECHNOLOGY KIM T. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only MICHEL A. TITLE: SCHEMATIC 1.4 GHZ LOW PHASE NOISE, LOW JITTER PLL WITH CLOCK DISTRIBUTION SIZE N/A SCALE = NONE D DATE: IC NO. LTC6950IUHH REV. 2 DEMO CIRCUIT 1795A 03/24/2014, 05:07 PM SHEET 2 E OF 2 1