8
dc1846af
DEMO MANUAL DC1846A
SCHEMATIC DIAGRAM
Note:
The buffers shown on sheet 2 of 2 of the schematic are used to protect the LTC6947 when connected to the DC590 before the LTC6947 is powered
up. There is no need for such circuitry if the SPI bus is not powered before powering up the LTC6947. The EEPROM is for identification and is not needed
to program the LTC6947.
A
A
B
B
C
C
D
D
E
E
4
4
3
3
2
2
1
1
0603
DC590B SPI INTERFACE
NOTE: EEPROM FOR BOARD IDENTIFICATION
CS
SCLK
SDI
SDO
3.3V
3.3V
3.3V
3.3V
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
2
01/28/2014, 12:25 PM
22
ULTRALOW NOISE AND SPURIOUS FRACTIONAL-N SYNTHESIZER
MICHEL A.
N/A
LTC6947IUFD
DEMO CIRCUIT 1846A
KIM T.
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
2
01/28/2014, 12:25 PM
22
ULTRALOW NOISE AND SPURIOUS FRACTIONAL-N SYNTHESIZER
MICHEL A.
N/A
LTC6947IUFD
DEMO CIRCUIT 1846A
KIM T.
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
2
01/28/2014, 12:25 PM
22
ULTRALOW NOISE AND SPURIOUS FRACTIONAL-N SYNTHESIZER
MICHEL A.
N/A
LTC6947IUFD
DEMO CIRCUIT 1846A
KIM T.
R7 200K
R7 200K
WPWP
GND
VCC
U10 NC7WZ17P6X
GND
VCC
U10 NC7WZ17P6X
1
6
4
3
5
2
R8 200K
R8 200K
SDOSDO
SCLKSCLK
V+DIGV+DIG
R12 100
R12 100
R19 200K
R19 200K
R22
100
R22
100
C44 0.1uF
C44 0.1uF
GND
DIR
VCC(A)
VCC(B)
U11 74LVC1T45GW
GND
DIR
VCC(A)
VCC(B)
U11 74LVC1T45GW
1
6
4
3
5
2
R18 200K
R18 200K
R26 4.99K
R26 4.99K
GND
VCC
U5 NC7WZ17P6X
GND
VCC
U5 NC7WZ17P6X
1
6
4
3
5
2
R21 100
R21 100
J13
HD2X7-079-MOLEX
J13
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
GND
3
GND
13
GND
8
C36 0.1uF
C36 0.1uF
CSCS
EEGNDEEGND
R9 0
R9 0
SDISDI
EEPROM
ARR
AY
U8
24LC025-I /ST
EEPROM
ARR
AY
U8
24LC025-I /ST
SDA
5
VCC
8
A0
1
A1
2
A2
3
GND
4
WP
7
SCL
6
R11 4.99K
R11 4.99K
C43 0.1uF
C43 0.1uF
C39 0.1uF
C39 0.1uF
C41
0.1uF
C41
0.1uF
R20 4.99K
R20 4.99K
