5 4 3 2 1 REVISION HISTORY ECO REV __ DESCRIPTION REBUILD WITH CHANGE 1 3.3V APPROVED DATE CHRIS P. 10-02-14 J6 3.3V D C1 1uF 16V 0805 RZ CP * CI1 * * 0603 0603 1% 0603 C2 + 330uF 10V 7343 J7 D GND CI2 * C7 0.01uF C6 1uF R1 51.1 1% 2 23 24 V+CP GNDD 26 25 CP REF+ CMb CMc SDI GNDC SDO TB TUNE MUTE 3 GND 3.3V L1 68nH 0402HPH-68NXJL -A -B -C -D LTC6946IUFD-1 LTC6946IUFD-2 LTC6946IUFD-3 LTC6946IUFD-4 2.24 TO 3.74 GHz 3.08 TO 4.91 GHz 3.84 TO 5.79 GHz 4.20 TO 6.39 GHz 16V 0805 17 16 15 TUNE RF+ CUSTOMER NOTICE CI1 CI2 CP RZ 0.022uF 0.022uF 0.022uF 0.01uF 6800pF 6800pF 6800pF 0.01uF 2700pF 2700pF 2700pF 1500pF 453 OHMS 453 OHMS 453 OHMS 536 OHMS 4 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. 5 B J5 SMA-R RF- 1. ALL RESISTORS ARE IN OHMS, 0402 ALL CAPACITORS ARE IN MICROFARADS, 0402. * 19 18 0.1uF C21 100pF 5% J4 SMA-R NOTE: UNLESS OTHERWISE SPECIFIED VCO C16 2.2uF 5% C20 100pF 5% U1 20 L2 3.3V 68nH C22 0402HPH-68NXJL 5% ASSY 22 21 C15 0.01uF C19 0.01uF JP1 A GND C18 1uF 16V 0805 3.3V 2 1 J9 BB V+RF V+D 3.3V 3.3V CMa SCLK C17 0.1uF D1 SML-010VT RED B 8 10V 7343 14 3.3V GNDA 13 7 V+VCO RF+ 6 C10 + 330uF C CS 12 SDI SDO 1 R3 330 5 MUTE STATUS 4 STAT 9 E3 CS SCLK * REFO RF- 3 SMA-R U1 V+REFO GNDB 2 11 1 V+REF 28 C14 0.022uF J3 27 REF- C13 0.1uF REF OUT C9 1uF 16V 0805 C12 0.01uF C11 1uF 3.3V C 5V C8 0805 1uF 16V 10 SMA-R J8 GND REF+ IN 5V R4 15 29 J1 0805 3 TECHNOLOGY KIM T. CHRIS P. TITLE: SCHEMATIC ULTRALOW NOISE & SPURIOUS INTEGER-N SYNTHESIZER WITH INTEGRATED VCO SIZE 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. LTC6946IUFD FAMILY REV. 1 DEMO CIRCUIT 1705C Thursday, October 02, 2014 SHEET 1 1 OF 2 A 5 4 3 2 DC590 SPI INTERFACE 3.3V D 1 U2 NC7WZ17P6X R5 200K 1 6 3 4 R10 100 R11 100 3.3V GND VCC 5 C23 SCLK 0.1uF V+DIG CS SCLK SDI SDO 1 V+ 2 5V 6 CS 4 SCK/SCL 7 MOSI/SDA 5 MISO 10 EEVCC 9 EESDA 11 EESCL 12 EEGND 14 AUX U3 NC7WZ17P6X R9 4.99K C26 0.1uF WP EEGND 3 4 2 GND 1 VCC(A) 2 GND 3 R15 0 0603 B 6 VCC R12 100 3.3V 5 U4 74LVC1T45GW 4 SCL SDA WP A2 A1 A0 ARRAY 13 8 3 6 5 7 3 2 1 1 SDI C C24 0.1uF 8 U5 24LC025-I /ST C3 0.1uF R7 200K VCC R8 4.99K R6 200K GND R14 4.99K GND GND GND C 2 EEPROM J2 HD2X7-079-MOLEX D CS 3.3V VCC(B) 6 DIR 5 C25 0.1uF 4 R16 100 SDO B R13 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. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 TECHNOLOGY KIM T. CHRIS P. TITLE: SCHEMATIC A ULTRALOW NOISE & SPURIOUS INTEGER-N SYNTHESIZER WITH INTEGRATED VCO SIZE IC NO. DATE: REV. LTC6946IUFD FAMILY 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 1 DEMO CIRCUIT 1705C Thursday, October 02, 2014 SHEET 2 1 2 OF 2