5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
VCO
2.24 TO 3.74 GHz
3.08 TO 4.91 GHz
3.84 TO 5.79 GHz
ASSY U1
*-A LTC6946IUFD-1
-B LTC6946IUFD-2
-C LTC6946IUFD-3
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0402
ALL CAPACITORS ARE IN MICROFARADS, 0402.
4.20 TO 6.39 GHz-D LTC6946IUFD-4
RZCI1 CI2 CP
453 OHMS0.022uF 453 OHMS
453 OHMS
536 OHMS
0.022uF
0.022uF
0.01uF
6800pF
6800pF
6800pF
0.01uF
2700pF
2700pF
2700pF
1500pF
3.3V
5V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
CS
SCLK
SDO
SDI
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
CHRIS P.
REBUILD WITH CHANGE
__
110-02-14
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
CHRIS P.
REBUILD WITH CHANGE
__
110-02-14
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
CHRIS P.
REBUILD WITH CHANGE
__
110-02-14
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 1705C
Thursday, October 02, 2014
12
ULTRALOW NOISE & SPURIOUS INTEGER-N
N/A LTC6946IUFD FAMILY
KIM T.
CHRIS P.
SYNTHESIZER WITH INTEGRATED VCO
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 1705C
Thursday, October 02, 2014
12
ULTRALOW NOISE & SPURIOUS INTEGER-N
N/A LTC6946IUFD FAMILY
KIM T.
CHRIS P.
SYNTHESIZER WITH INTEGRATED VCO
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 1705C
Thursday, October 02, 2014
12
ULTRALOW NOISE & SPURIOUS INTEGER-N
N/A LTC6946IUFD FAMILY
KIM T.
CHRIS P.
SYNTHESIZER WITH INTEGRATED VCO
C6
1uF
C6
1uF
L2
68nH
0402HPH-68NXJL
5%
L2
68nH
0402HPH-68NXJL
5%
C12
0.01uF
C12
0.01uF
C8
1uF 16V
0805C8
1uF 16V
0805
J3
SMA-R
REF
OUT
J3
SMA-R
REF
OUT
JP1
GND
3.3V
MUTE
JP1
GND
3.3V
MUTE
1
3
2
C20
100pF
5%
C20
100pF
5%
J1
SMA-R
REF+
IN
J1
SMA-R
REF+
IN
+
C2
330uF
10V
7343
+
C2
330uF
10V
7343
C9
1uF
16V
0805
C9
1uF
16V
0805
C16
2.2uF
16V
0805
C16
2.2uF
16V
0805
L1
68nH
0402HPH-68NXJL
5%
L1
68nH
0402HPH-68NXJL
5%
J5
SMA-R
RF+
J5
SMA-R
RF+
J7 GND
J7 GND
C21
100pF
5%
C21
100pF
5%
R3
330
R3
330
J9
GND
J9
GND
J8 5V
J8 5V
C22
0.1uF
C22
0.1uF
TUNETUNE
C13
0.1uF
C13
0.1uF
J6 3.3V
J6 3.3V
E3
STATUS E3
STATUS
R4
15
R4
15
C19
0.01uF
C19
0.01uF
U1 *
U1 *
REFO
2
TUNE 15
STAT
3
MUTE
9
SCLK
5
V+D
8
SDO
7
RF+
12 RF-
11 GNDB
10
CS
4
TB 16
GNDC 17
V+RF
13
V+REFO
1
BB
14
SDI
6CMc 18
CMb 19
CMa 20
GNDA 21
V+VCO 22
GNDD 23
V+CP 24
CP 25
V+REF 26
REF+ 27
REF- 28
GND 29
C7
0.01uF
C7
0.01uF
CI2
*
0805
CI2
*
0805
CP
*
0603
CP
*
0603
C15
0.01uF
C15
0.01uF
C14
0.022uF
C14
0.022uF
J4
SMA-R
RF-
J4
SMA-R
RF-
CI1
*
0603
CI1
*
0603
R1
51.1
1%
R1
51.1
1%
C17
0.1uF
C17
0.1uF
+
C10
330uF
10V
7343
+
C10
330uF
10V
7343
D1
SML-010VT
RED
D1
SML-010VT
RED
2 1
C11
1uF
C11
1uF
C18
1uF
16V
0805
C18
1uF
16V
0805
RZ
*
1%
0603
RZ
*
1%
0603
C1
1uF
16V
0805
C1
1uF
16V
0805
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
0603
NOTE: EEPROM FOR BOARD IDENTIFICATION
DC590 SPI INTERFACE
3.3V
3.3V
3.3V
3.3V
CS
SCLK
SDI
SDO
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 1705C
Thursday, October 02, 2014
22
ULTRALOW NOISE & SPURIOUS INTEGER-N
N/A LTC6946IUFD FAMILY
KIM T.
CHRIS P.
SYNTHESIZER WITH INTEGRATED VCO
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 1705C
Thursday, October 02, 2014
22
ULTRALOW NOISE & SPURIOUS INTEGER-N
N/A LTC6946IUFD FAMILY
KIM T.
CHRIS P.
SYNTHESIZER WITH INTEGRATED VCO
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 1705C
Thursday, October 02, 2014
22
ULTRALOW NOISE & SPURIOUS INTEGER-N
N/A LTC6946IUFD FAMILY
KIM T.
CHRIS P.
SYNTHESIZER WITH INTEGRATED VCO
R11 100R11 100
C23 0.1uFC23 0.1uF
CSCS
C3
0.1uF
C3
0.1uF
R12
100
R12
100
R10
100
R10
100
V+DIGV+DIG
R7
200K
R7
200K
SDOSDO
J2
HD2X7-079-MOLEX
J2
HD2X7-079-MOLEX
MOSI/SDA 7
EESDA 9
V+ 1
5V 2
CS 6
SCK/SCL 4
EEVCC 10
MISO 5
EESCL 11
EEGND 12
AUX 14
GND
3GND
13 GND
8
R6
200K
R6
200K
R15
0
R15
0
EEPROM
ARRAY
U5
24LC025-I /ST
EEPROM
ARRAY
U5
24LC025-I /ST
SDA
5
VCC 8
A0
1A1
2A2
3
GND
4
WP
7SCL
6
R5
200K
R5
200K
C24
0.1uF
C24
0.1uF
WPWP R13
200K
R13
200K
EEGNDEEGND
GND
DIR
VCC(A) VCC(B)
U4
74LVC1T45GW
GND
DIR
VCC(A) VCC(B)
U4
74LVC1T45GW
1 6
43
52
R8
4.99K
R8
4.99K
SDISDI
C25
0.1uF
C25
0.1uF
R16
100
R16
100
GND VCC
U3
NC7WZ17P6X
GND VCC
U3
NC7WZ17P6X
1 6
43
52
R9
4.99K
R9
4.99K
C26
0.1uF
C26
0.1uF
R14
4.99K
R14
4.99K
SCLKSCLK
GND VCC
U2
NC7WZ17P6X
GND VCC
U2
NC7WZ17P6X
1 6
43
52
