DC1959B - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
__
3.3V
J6
*
C1
1uF
0603
J7
C2_F1
+ C2
J8
C9
1uF
0603
J9
330uF
10V
7343
R18
0
7
C27
0.1uF 3.3V
8
MUTE
LDO
3.3V
C17
0.1uF
3.3V
3.3V
23
GNDD
V+VCO
25
24
26
CP
V+CP
L1
68nH
0402HPH-68NXJL
C20
100pF
RF-
1. ALL RESISTORS ARE IN OHMS, 0402
2. ALL CAPACITORS ARE IN MICROFARADS, 0402
A
B
C
D
LTC6948-1
LTC6948-2
LTC6948-3
LTC6948-4
5
3.3V
C18
1uF
0603
SUFFIX
VCO
C2_F1
CI1
CP
R1_F1, RZ
1
2
3
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
2.4nF
2nF
1.8nF
1.6nF
82nF
68nF
56nF
56nF
3.6nF
3nF
2.4nF
2.4nF
57.6
63.4
75
76.8
C22
0.1uF
C21
100pF
RF+
CUSTOMER NOTICE
4
TUNE
J5
SMA-R
NOTE: UNLESS OTHERWISE SPECIFIED
*
15
L2
3.3V
68nH
0402HPH-68NXJL
J4
SMA-R
U1
0603
C19
0.01uF
JP1
ASSY
17
C16
2.2uF
B
1
GND
C2_F2
OPT
0603
16
TUNE
R19
0
2
B
18
TB
QFN28UFD-4X5
V+D
R20
0
3
V+REF
28
GNDB
9
2
C28
OPT
0603
CMC
SDO
MUTE
D1
LN1251C
19
CMB
SDI
C
BB
6
20
CMA
SCLK
C15
1uF 0603
21
GNDC
V+RF
SDO
22
14
1
SDI
5
CS
C13
0.01uF
BVCO
13
4
*
RF+
CS
SCLK
U1
STAT
12
3
RF-
2
STATUS
REF+
GNDA
E3
11
1
10
C
27
29
GND
R1
51.1
R3
330
0805
R1_F2
OPT
0603
REF-
SMA-R
L1_F2
OPT
0805
C11
1uF
C6
1uF
J1
REF+
IN
D
C8
1uF 0603
C12
0.01uF
A
*
5V
R4
15
C7
0.1uF
09-21-15
*0603
CI1
0603
CI2
OPT
R2
0
+ C10
GND
*
0603
3.3V
5V
DATE
CHRIS P.
RZ
CP
0603
5V
APPROVED
REBUILD WITH CHANGE
0805
0603
*
330uF
10V
7343
GND
D
L1_F1
10uH
R1_F1
3.3V
DESCRIPTION
1
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.
TECHNOLOGY
KIM T.
CHRIS P.
TITLE: SCHEMATIC
ULTRALOW NOISE & SPURIOUS FRACTIONAL-N
SYNTHESIZER WITH INTEGRATED VCO
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
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.
LTC6948IUFD-1/2/3/4
REV.
1
DEMO CIRCUIT 1959B
Monday, September 21, 2015
SHEET
1
1
OF
2
A
5
4
3
2
1
DC590 SPI INTERFACE
3.3V
D
U2
NC7WZ17P6X
R5
200K
1
6
3
4
R10
100
R11 100
SCLK
3.3V
GND
VCC
5
C23
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
R21
100
R15
0
0603
B
EEGND
6
3
4
2
GND
VCC
R12
100
3.3V
C24
0.1uF
3.3V
C25
0.1uF
5
U4
74LVC1T45GW
4
SCL
SDA
WP
A2
A1
A0
ARRAY
13
8
3
6
5
7
3
2
1
1
SDI
C
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
1
VCC(A)
2
GND
3
VCC(B)
6
DIR
5
4
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
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
5
4
3
IC NO.
DATE:
REV.
LTC6948IUFD-1/2/3/4
N/A
SCALE = NONE
A
ULTRALOW NOISE & SPURIOUS FRACTIONAL-N
SYNTHESIZER WITH INTEGRATED VCO
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
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 1959B
Monday, September 21, 2015
SHEET
2
1
2
OF
2
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