DC1846A - Schematic

1
2
3
4
5
6
7
5V
ECO
__
V+OA
J3
MUTE
8
VCO-
3.3V
L2
68nH
0402HPH-68NXJL
35V 0805
18
17
16
ASSY
*
U3
-A
CVCO55CC-2328-2536
R30
0
1uF
10
9
C28
OPT
L1_F3
OPT
0805
U3
R2_F2
0
0603
*
GND
GND
GND
VTUNE
RFOUT
GND
GND
GND
C35
0.1uF
R2_F3
OPT
0603
U4
2
3
OPT
VTUNE
EN
NC
GND
C33 E15
47uF
35V
7361
E16
35V 0805
6
R23
VCC
OPT
5
RFOUT
1
4
V+VCO
GND
B
V+VCXO
GND
4
R24
OPT
2
C3_F2
OPT
0603
CPGAIN
OPT
V+VCXO
1
3
CPGAIN
C3_F3
OPT
0603
E17
E18
GND
C
EN
C25
OPT
J5
EXT VCO IN
L1
OPT
RF+
J7
J6
CUSTOMER NOTICE
VCO
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0402
2. ALL CAPACITORS ARE IN MICROFARADS, 0402.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
3
4
5
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
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.
2328 - 2536 MHz
2
11
E13
C34
0.01uF
C45
0.01uF
C38
100pF
RF-
1
C26
100pF
15
12
C19
47uF
35V
7361
+
19
L3
3.3V
68nH
0402HPH-68NXJL
C37
100pF
D
C21 0.1uF
20
0603
JP1
L1_F2
OPT
0805
V+VCO
21
C29
100pF 3.3V
C31
CI2_P
OPT 1206
J4
E14
16
V+D
0603
RZ_P
21
0603
CI1_P
1uF 0603
0
+
A
GND
R13 OPT
GND
VCO+
3.3V
GND
CP_P
47nF
0603
C23
0.01uF
23
GNDH
25
24
V+CP
27
26
CP
V+REF
LDO
C30
0.1uF
3.3V
REF-
GNDB
MUTE
3.3V R29
0
SDO
9
C
C11
0.1uF
GNDC
5V
J11
GND
7
SDI
C16
330uF
10V
7343
V+VCO
CI2_A
OPT 1206
R14
BB
6
GNDD
V+RF
5
GNDE
SCLK
+
0603
22
GNDF
CS
RF+
4
13
CS
SCLK
SDI
SDO
C13
1uF
0603
E12
3.3V
U1
LTC6947IUFD
GNDG
QFN28UFD-4X5
STAT
12
3
RF-
2
REF+
GNDA
1
11
RED
C14
OPT
0603
28
29
2
10
1
C18
1uF
0603
R27
0
GND
E6
STATUS
D1
LN1251CTR
R4
330
E11
5
C15
1uF
C8
1uF
B
C17
0.01uF
01-28-14
V+OA
5V
5
+INB
DATE
MICHEL A.
CI1_A
OPT 0603
RZ_A OPT
0603
R28
0
V+VCO
C4
0.1uF
R5
51.1
14
J2
C1
47uF
35V
7361
APPROVED
CP_A
OPT 0603
5V
R25
0
REF+
PRODUCTION
J12
0603
3.3V
DESCRIPTION
2
0603
R16 0
14
0603
V-
+
REV
35V
0805
6
-INB
B
15
0805
0603
J10
20V 7343
A
+INA
4
VCC
R1_F1
21
3
GND
L1_F1
0
47uF
7
OUTB
GND
C5
1uF
0603
C7
R15
OPT
C2
0.1uF
8
V+
GND
GND
C2_F1
33nF
-INA
13
+
C3
330uF
10V
7343
OUTA
2
GND
J9
1
0.1uF
+
3.3V
C6
R31
OPT
0603
6
3.3V
U2
LT1678IS8
GND
CP
OPT
R2
4.99K
7
A
E3
C12
1uF
0603
R1
4.99K
8
CP
8
REVISION HISTORY
TECHNOLOGY
KIM T.
TITLE:
SCHEMATIC
MICHEL A.
ULTRALOW NOISE AND SPURIOUS FRACTIONAL-N SYNTHESIZER
SIZE
N/A
SCALE = NONE
6
DATE:
LTC6947IUFD
IC NO.
REV.
2
DEMO CIRCUIT 1846A
01/28/2014, 12:25 PM
7
SHEET 1
8
OF 2
D
A
B
C
D
E
DC590B SPI INTERFACE
3.3V
4
J13
HD2X7-079-MOLEX
1
6
3
4
2
2
WP
R8
200K
5
3.3V
6
C41
4
SCLK
0.1uF
3
4
VCC
3.3V
5
SDI
C44
0.1uF
3
8
GND
R12
100
U11
74LVC1T45GW
C36
0.1uF
1
VCC(A)
2
GND
3
R9
0
0603
EEGND
1
2
VCC
SCL
SDA
WP
A2
A1
A0
C43
0.1uF
4
13
8
3
6
5
7
3
2
1
U8
24LC025-I /ST
R7
200K
GND
R26
4.99K
ARRAY
R20
4.99K
GND
GND
GND
R11
4.99K
EEPROM
10
9
11
12
14
EEVCC
EESDA
EESCL
EEGND
AUX
VCC
CS
R22 100
U10
NC7WZ17P6X
6
4
7
5
CS
SCK/SCL
MOSI/SDA
MISO
GND
R21
100
V+DIG CS SCLK SDI SDO
1
2
V+
5V
3
U5
NC7WZ17P6X
R19
200K
3.3V
VCC(B)
6
DIR
5
C39
0.1uF
4
SDO
2
R18
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.
KIM T.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP
ENG.
MICHEL A.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
1
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
A
B
C
TECHNOLOGY
TITLE: SCHEMATIC
1
ULTRALOW NOISE AND SPURIOUS FRACTIONAL-N SYNTHESIZER
SIZE
LTC6947IUFD
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.
DEMO CIRCUIT 1846A
01/28/2014, 12:25 PM
D
SHEET 2
E
2
OF 2
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