9
dc1705cfa
DEMO MANUAL DC1705C
schematic Diagram
Note:
The buffers shown on sheet 2 of 2 of the schematic are used to protect the LTC6946 when communicating to it starts before powering it up. There is no
need for such circuitry if the SPI bus is not active before powering up the LTC6946. The EEPROM is for identification and is not needed to program the LTC6946.
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
01/22/2013, 12:44 PM
22
ULTRALOW NOISE & SPURIOUS INTEGER-N
N/A
LTC6946IUFD-1/-2/-3
KIM T.
MICHEL A.
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
01/22/2013, 12:44 PM
22
ULTRALOW NOISE & SPURIOUS INTEGER-N
N/A
LTC6946IUFD-1/-2/-3
KIM T.
MICHEL A.
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
01/22/2013, 12:44 PM
22
ULTRALOW NOISE & SPURIOUS INTEGER-N
N/A
LTC6946IUFD-1/-2/-3
KIM T.
MICHEL A.
SYNTHESIZER WITH INTEGRATED VCO
R11
100
R11
100
C23
0.1uF
C23
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
GN
D
3
GN
D
13
GN
D
8
R6 200K
R6 200K
R15 0
R15 0
EEPROM
AR
RA
Y
U5
24LC025-I /ST
EEPROM
AR
RA
Y
U5
24LC025-I /ST
SDA
5
VC
C
8
A0
1
A1
2
A2
3
GN
D
4
WP
7
SCL
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
4
3
5
2
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
4
3
5
2
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
4
3
5
2
