DC1959A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
__
3.3V
J6
J7
*
C1
1uF
0603
C2_F1
+ C2
J9
330uF
10V
7343
GND
R18
0
C11
1uF
6
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
3.3V
C18
1uF
0603
ASSY
U1
VCO
C2_F1
CI1
CP
R1_F1, RZ
A
B
C
D
LTC6948IUFD-1
LTC6948IUFD-2
LTC6948IUFD-3
LTC6948IUFD-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
5
15
L2
3.3V
68nH
0402HPH-68NXJL
J4
SMA-R
*
0603
C19
0.01uF
JP1
A
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
SDO
20
CMA
SCLK
C15
1uF 0603
21
GNDC
V+RF
1
SDI
5
CS
*
22
14
4
SCLK
C13
0.01uF
BVCO
13
CS
R3
330
U1
STAT
RF+
3
12
2
STATUS
REF+
RF-
E3
GNDA
1
11
C
27
29
GND
R1
51.1
REF-
SMA-R
R1_F2
OPT
0603
10
C6
1uF
J1
L1_F2
OPT
0805
C8
1uF 0603
C12
0.01uF
REF+
IN
01-27-14
D
0805
5V
R4
15
C7
0.1uF
DATE
MICHEL A.
*0603
*
0603
CI2
OPT
R2
0
+ C10
APPROVED
RZ
CI1
*
0603
3.3V
5V
C9
1uF
0603
CP
0603
5V
J8
PRODUCTION
0805
0603
*
330uF
10V
7343
GND
D
L1_F1
10uH
R1_F1
3.3V
DESCRIPTION
2
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.
3
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
ULTRALOW NOISE & SPURIOUS FRACTIONAL-N
SYNTHESIZER WITH INTEGRATED VCO
SIZE
N/A
SCALE = NONE
2
DATE:
IC NO.
LTC6948IUFD-1/-2/-3/-4
REV.
2
DEMO CIRCUIT 1959A
01/27/2014, 12:05 PM
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
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
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.
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
SIZE
IC NO.
DATE:
REV.
LTC6948IUFD-1/-2/-3/-4
N/A
SCALE = NONE
A
ULTRALOW NOISE & SPURIOUS FRACTIONAL-N
SYNTHESIZER WITH INTEGRATED VCO
2
DEMO CIRCUIT 1959A
01/27/2014, 11:57 AM
SHEET
2
1
2
OF
2
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