DC1649A - Schematic

2
3
4
5
6
J3
J10
GNDD
SCLK
GNDC
SDI
GNDB
SDO
VCO+
GND
D
-A
U3
CVCO55CL-0902-0928
VCO
U1
18
LTC6945IUFD
17
16
12
15
BB
V+RF
19
1. ALL RESISTORS ARE IN OHMS, 0402
ALL CAPACITORS ARE IN MICROFARADS, 0402.
11
C26 100pF
10
9
C28 OPT
+
GND
GND
GND
VTUNE
RFOUT
GND
GND
GND
C35
0805
2
3
U4
OPT
VTUNE
EN
GND
VCC
NC
RFOUT
6
5
47uF
35V
E15
0.1uF
E16
GND
B
GND
4
1
R24
OPT
2
E17
3
4
E18
C27
OPT
0603
V+VCXO
R23 OPT
GND
EN
C
C32
OPT
0603
J5
L1
OPT
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
3
C33
7361
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
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
902 - 928 MHz
2
R17
OPT
0603
*
CUSTOMER NOTICE
RF+
NOTE: UNLESS OTHERWISE SPECIFIED
1
C42
100pF
V+VCO
EXT VCO IN
J6
RF-
E13
3.3V
C45
0.01uF
C38
100pF
R10
0
0603
C25
OPT
0.01uF
L3
68nH
J7
ASSY
20
C31 1.0uF
14
RF+
L2
68nH
C37
100pF
*
13
12
RF-
GNDA
11
MUTE
9
3.3V
JP1
0603
0
OPT
V+VCXO
C19 V+VCO
47uF
35V
7361
C21 0.1uF
U3
0805
21
GND
V+VCO
E14
8
MUTE
R14
1206
3.3V C23
0.01uF
22
C29
100pF
3.3V
C34
3.3V
OPT
16
GNDE
CS
3.3V
OPT
R13
GND
GNDF
STAT
V+D
J11
0603
14
V+VCO
REFO
10
C30
0.1uF
A
5V
CPGAIN
0603
CI2_P 0.1uF
VCO8
CI1_P
V+OA
5V
J4
RZ_P
806
0603
15
24
V+CP
25
V+REFO
3.3V
C
E11
J12
GND
7
47uF
35V
C2
0.1uF 0805
5
6
C16
330uF CP_P
10V 8200pF
7343
0603
VCC
5
SCLK
SDI
SDO
+
OPT
1206
GND
4
CS
C18
1.0uF
0805
13
3
09-30-11
0603
GND
2
DATE
MICHEL A.
+
1
CP
REF-
28
E6
APPROVED
OPT
CI2_A
470pF
27
C15
DESCRIPTION
PRODUCTION
CPGAIN
CI1_A
GND
2
B
STATUS
C17
0.1uF
26
1
C8
470pF
C24
0.1uF
REF+
R4
330
D1
LN1251C
4
E12
0603
5V
V+REF
J1
3.3V
RZ_A OPT
29
REF0
R5 51.1
GND
C11
0.1uF
23
J2
8
REV
CP_A
OPT 0603
R16
0
0603
REF+
V-
GND
C4
0.1uF
GND
GND
C5
1.0uF
4
C7 47uF
7343 20V
R15
OPT
0603
C1
7361
V+
7
OUTB
6
-INB
B
5
+INB
6
+
C3
330uF
10V
7343
OUTA
-INA
A
3
+INA
2
+
J9
U2
LT1678IS8
1
C6 0.1uF
0805
3.3V
3.3V
C12
1.0uF
7
CP
OPT
ECO
__
V+OA
R1
4.99K
R2
4.99K
GNDG
A
E3
8
REVISION HISTORY
5V
CP
7
+
1
4
5
TECHNOLOGY
KIM T.
MICHEL A.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER
SIZE
N/A
SCALE = NONE
6
DATE:
LTC6945IUFD
IC NO.
REV.
4
DEMO CIRCUIT 1649A
09/30/2011, 11:05 AM
7
SHEET 1
8
OF 2
D
A
B
C
D
3.3V
4
1
3
R26
4.99K
5
C41
4
SCLK
0.1uF
R8
200K
3
4
2
VCC
C36
0.1uF
GND
1
VCC(A)
2
GND
3
VCC
3.3V
5
SDI
C44
0.1uF
3
3.3V
VCC(B)
6
DIR
5
C39
0.1uF
4
SDO
2
R18
200K
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
B
6
U7
74LVC1T45GW
R9
0
0603
EEGND
1
R12
100
8
C43
0.1uF
4
13
8
3
SCL
SDA
WP
A2
A1
A0
R7
200K
GND
U8
24LC025-I /ST
ARRAY
R25
4.99K
EEPROM
R27
4.99K
WP
A
VCC
3.3V
U6
NC7WZ17P6X
6
5
7
3
2
1
1
R22 100
4
GND
CS
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
2
R21
100
6
2
GND
GND
GND
3
U5
NC7WZ17P6X
R19
200K
DC590B SPI INTERFACE
J8
HD2X7-079-MOLEX
E
C
TECHNOLOGY
KIM T.
MICHEL A.
TITLE: SCHEMATIC
1
ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER
SIZE
LTC6945IUFD
IC NO.
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
DATE:
REV.
4
DEMO CIRCUIT 1649A
09/30/2011, 11:05 AM
D
SHEET 2
E
OF 2
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