Linear Technology DC1705C Quick setup guide

dc1705cfa

DEMO MANUAL DC1705C

Description

LTC6946

Ultralow Noise and Spurious Integer-N

Frequency Synthesizer with Integrated VCO

DC1705C features the LTC

6946, an ultralow noise and

spurious integer-N frequency synthesizer with integrated

VCO. The VCO uses no external components and is inter-

nally calibrated without external system support.

There are three versions of the DC1705C, one for each

version of the LTC6946. The DC1705C-A contains the

LTC6946-1, the DC1705C-B incorporates the LTC6946-2

and DC1705C-C uses the LTC6946-3.

Each DC1705C provides 50Ω SMA connectors for the

reference frequency input, fREF (REF+ IN), the reference

output buffer (REF OUT), and the differential RF output

(RF+and RF–). A DC590 USB serial controller board is

used for SPI communication with the LTC6946, controlled

by the supplied PLLWizard™ software.

Design files for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PLLWizard and QuikEval are trademarks of Linear Technology Corporation. All other trademarks

are the property of their respective owners.

Figure 1. Proper Measurement Equipment Setup

dc1705cfa

DEMO MANUAL DC1705C

PARAMETER INPUT OR OUTPUT PHYSICAL LOCATION DETAILS

3.3V Power Supply Input 3.3V and GND Banana Jacks Low Noise and Spur-Free 3.3V, 115mA

5V Power Supply Input 5V and GND Banana Jacks Low Noise and Spur-Free 5V, 45mA

REF+IN, Reference Frequency Input J1 SMA Connector Low Noise 10MHz or 100MHz*, 6dBm into 50Ω

(Note 1)

REF OUT, Buffered Reference Output J3 SMA Connector Frequency = fREF, 0dBm

RF+and RF–Two Outputs J4 and J5 SMA Connectors Frequency: 900MHz*, Power: 0dBm, Frequency

Range: Depends on the version of the LTC6946

device – refer to Table 1, Step Size: 200kHz*

Loop Bandwidth – Set by Loop Filter Component Values 47kHz*

* These frequencies are for the DC1705C pllset files included with PLLWizard.

Note 1: A low noise 10MHz or 100MHz reference frequency, such as the Wenzel 501-04608A or 501-04516D OCXO, is recommended. If using a different

frequency, make sure to update the fREF and R_DIV boxes under the System tab in PLLWizard so that fPFD is still 1MHz. For example, if a 20MHz clock is

used, fREF should be changed to 20MHz and R_DIV to 20. REF BST and FILT under the System tab in PLLWizard might need to be changed if the reference

frequency and/or power is different than what is recommended in the table above. More information can be found in the LTC6946 data sheet.

Table 1. DC1705C Options and Frequency Ranges

ASSEMBLY VERSION PART NUMBER VCO FREQUENCY RANGE (GHz) OUTPUT DIVIDER SETTINGS

DC1705C-A LTC6946IUFD-1 2.240 to 3.740 Integers 1 through 6

DC1705C-B LTC6946IUFD-2 3.080 to 4.910 Integers 1 through 6

DC1705C-C LTC6946IUFD-3 3.840 to 5.790 Integers 1 through 6

typical Dc1705c requirements anD characteristics

quick start proceDure

The DC590 and PLLWizard application are required to

control the DC1705C through a personal computer (PC).

DC590 Configuration

The DC590’s QuikEval™ drivers must be installed before

the DC590 will be able to communicate with the LTC6946.

To configure the DC590, follow the procedure below, start-

ing with step 1. If you have already installed the DC590

software previously, skip to step 5.

Note: Once the QuikEval software is installed, the applica-

tion does not need to be executed to run PLLWizard or to

control the DC1705C.

1. Do Not plug in the DC590 before running the installation

program.

2. Download the QuikEval installation program from

http://www.linear.com/software.

3. Run the QuikEval installation program and follow the

on-screen instructions. More detailed installation infor-

mation may be found in the DC590’s Quick Start guide.

4. Exit the QuikEval program once the installation is com-

plete, as it is not needed to run the PLLWizard software.

5. Place the DC590 jumpers in the following positions:

JP4 EE Must be in the “EN” position.

JP5 ISO “ON” must be selected.

JP5 SW “ON” must be selected.

JP6 VCCIO “3.3V” must be selected. This sets the SPI

port to 3.3V operation.

6. Connect the DC590 to one of your computer’s USB

ports with the included USB cable.

dc1705cfa

DEMO MANUAL DC1705C

Figure 2. DC590 Jumper Locations

quick start proceDure

PLLWizard Installation

The PLLWizard software is used to communicate with

the LTC6946 synthesizer. It uses the DC590 to translate

between USB and SPI-compatible serial communications

formats. It also includes advanced PLL design and simula-

tion capabilities. The following are the PLLWizard system

requirements:

• WindowsOperatingSystem:WindowsXP,

Windows 2003 Server, Windows Vista, Windows 7

• Microsoft.NET2.0orlater

• WindowsInstaller3.1orlater

• LinearTechnology’sQuikEvalandDC590hardware

Microsoft .NET

You must have Microsoft .NET 2.0 or later installed on

your computer. PLLWizard will not run without it. Note that

with Windows Vista and Windows 7, you should have at

least version 3.5 pre-installed.

To manually determine your version of .NET using Win-

dows XP, click Start Menu →Settings →Control Panel

→Add or Remove Programs.

Depending upon your .NET version, choose one of

two PLLWizard setup programs, downloaded from

http://www.linear.com/software.

dc1705cfa

DEMO MANUAL DC1705C

quick start proceDure

Figure 3. PLLWizard Screenshot

Either setup program will automatically install Microsoft

.NET if a compatible .NET version is not found. But, the

installation source depends upon which file you down-

loaded from Linear Technology’s website. You should pick

one of the following two choices, depending upon your

version of .NET.

Table 2. PLLWizard Installation File

FILE .NET 2.0 SOURCE

PLLWizardSetup.exe Latest Version Downloaded from Microsoft

PLLWizardSetup_net20.exe 2.0 SP2 Included (Much Larger File Size)

• ChoosePLLWizardSetup if you have .NET 2.0 or later,

have Windows Vista or Windows 7, or if you have less

than .NET 2.0 but want the latest .NET installed.

• ChoosePLLWizardSetup_net20 if you have less than

.NET 2.0, and want faster installation (no additional

Microsoft downloads are needed, but the file size is

much larger).

The setup file will verify and/or install Microsoft .NET and

install PLLWizard. Refer to the Help menu for software

operation.

dc1705cfa

DEMO MANUAL DC1705C

quick start proceDure

DC1705C Configuration

1. Connect an appropriate reference frequency source (at

J1) and signal analyzers (at J4 and/or J5) using the

SMA connectors (see Figure 1 and the Typical DC1705C

Requirements and Characteristics table).

2. Choose theMUTE jumpersetting:JP1 - GND/3.3VMUTE

position. Select GND to mute the RF output, 3.3V to

un-mute.

3. Connect the GND, 3.3V and 5V banana jacks to a power

supply and apply power (see Figure 1 and the Typical

DC1705C Requirements and Characteristics table).

4. Connect the DC590 to the DC1705C with the provided

ribbon cable.

5. Run the PLLWizard application.

6. In PLLWizard, click File →Load Settings and point

to the appropriate pllset file. For example, if you are

using a 10MHz reference with a DC1705C-B to evalu-

ate the LTC6946-2, load the “DC1705-B (LTC6946-2)

10MHz.pllset” file found in the PLLWizard installation

directory (typically Program Files →LTC →PLLWizard

→ Set Files).

The red LED on DC1705C should turn on indicating that

the loop is locked at 900MHz.

You can then change the values of N_DIV and/or O_DIV

in PLLWizard to change the output frequency.

Troubleshooting

If the red LED does not illuminate, follow the instructions

below:

1. Verify that you are able to communicate with the

DC1705C. The bottom status line in PLLWizard should

read “LTC6946” and “Comm Enabled.” Refer to PLL-

Wizard’s Troubleshoot and Help if not.

2. Verify that the 3.3V and 5V have the correct voltages

on them and that the reference frequency is applied to

the REF+IN SMA input.

If the red LED is on but you cannot detect an RF output,

make sure jumper JP1 is at the 3.3V position. Run Help →

Troubleshoot in PLLWizard if the problem is not resolved.

DC1705C Reconfiguration

You can redesign the frequency plan of the DC1705C us-

ing PLLWizard. You can change the loop filter as found

using PLLWizard by reinstalling the loop filter components

shown in Figure 4.

dc1705cfa

DEMO MANUAL DC1705C

Figure 4. DC1705C Components and Connections

quick start proceDure

dc1705cfa

DEMO MANUAL DC1705C

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1705C General BOM

1 1 CI1 CAP., X7R 0.022µF 50V 5%, 0603 AVX, 06035C223JAT2A

2 1 CI2 CAP., COG 6800pF 50V 5%, 0805 MURATA, GRM2195C1H682JA01D

3 1 CP CAP., COG 2700pF 50V 5%, 0603 MURATA, GRM1885C1H272JA01D

4 4 C1, C8, C9, C18 CAP., X7R, 1.0µF, 16V, 10%, 0805 TDK, C2012X7R1C105K

5 2 C2, C10 CAP., Tantalum, 330µF,10V, 10%, 7343 AVX, TPME337K010R0035

6 8 C3, C13, C17, C22-C26 CAP., X5R, 0.1µF, 10V, 10%, 0402 TDK, C1005X5R1A104K

7 2 C6, C11 CAP., X5R, 1µF, 16V, 10%, 0402 TDK, C1005X5R1C105K

8 4 C7, C12, C15, C19 CAP., X7R, 0.01µF, 16V, 10%, 0402 AVX, 0402YC103KAT2A

9 1 C14 CAP., X7R 0.022µF 16V, 10%, 0402 AVX, 0402YC223KAT2A

10 1 C16 CAP., X7R, 2.2µF, 16V, 10%, 0805 TDK, C2012X7R1C225K

11 2 C20, C21 CAP., NPO, 100pF, 50V, 5%, 0402 TDK, C1005C0G1H101J

12 1 D1 LED, RED ROHM, SML-010VTT86L

13 1 E3 TURRET, Testpoint, 2501 MILL-MAX, 2501-2-00-80-00-00-07-0

14 1 JP1 HEADERS, 3 Pins 2mm Ctrs. SAMTEC, TMM-103-02-L-S

15 4 J1, J3, J4, J5 CON., SMA 50-OHM EDGE-LAUNCH E.F. JOHNSON, 142-0701-851

16 1 J2 CON., Header, 14 Pin, 2mm MOLEX, 87831-1420

17 4 J6, J7, J8, J9 JACK, BANANA KEYSTONE, 575-4

18 2 L1, L2 IND, 68nH 5%, 0402 COILCRAFT, 0402HPH-68NXJLW

19 1 RZ RES., CHIP, 453Ω, 1/10W 1%, 0603 NIC, NRC06F4530TRF

20 1 R1 RES., CHIP, 51.1Ω, 1/16W, 1%, 0402 NIC, NRC04F51R1TRF

21 1 R3 RES., CHIP, 330Ω, 1/16W, 1%, 0402 NIC, NRC04F3300TRF

22 1 R4 RES., CHIP, 15Ω, 1/16W, 1%, 0402 NIC, NRC04F15R0TRF

23 4 R5, R6, R7, R13 RES., CHIP, 200K, 1/16W, 1%, 0402 NIC, NRC04F2003TRF

24 3 R8, R9, R14 RES., CHIP, 4.99K, 1/16W, 1%, 0402 NIC, NRC04F4991TRF

25 4 R10, R11, R12, R16 RES., CHIP, 100Ω 1/16W, 5%, 0402 NIC, NRC04J101TRF

26 1 R15 RES., CHIP, 0Ω, 0603 VISHAY, CRCW06030000Z0EA

27 2 U2, U3 I.C., Dual Buffer, SC70 FAIRCHILD SEMI., NC7WZ17P6X

28 1 U4 I.C., Dual Transceiver, SOT363 NXP, 74LVC1T45GW

29 1 U5 I.C., Serial EEPROM, TSSOP8 MICROCHIP, 24LC025-I/ST

30 1 SHUNT ON JP1 (2&3) SHUNT, 2mm Ctrs. SAMTEC, 2SN-BK-G

31 4 MH1-MH4 STANDOFF, NYLON, 0.5, 1/2" KEYSTONE, 8833 (SNAP ON)

32 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1705C

DC1705C-A

1 1 GENERAL BOM DC1705C

2 1 U1 I.C. Synthesizer, QFN28UFD-4X5 LINEAR TECH., LTC6946IUFD-1#PBF

DC1705C-B

1 1 GENERAL BOM DC1705C

2 1 U1 I.C. Synthesizer, QFN28UFD-4X5 LINEAR TECH., LTC6946IUFD-2#PBF

DC1705C-C

1 1 GENERAL BOM DC1705C

2 1 U1 I.C. Synthesizer, QFN28UFD-4X5 LINEAR TECH., LTC6946IUFD-3#PBF

dc1705cfa

DEMO MANUAL DC1705C

schematic Diagram

D D

C C

B B

A A

VCO

2.24 TO 3.74 GHz

3.08 TO 4.91 GHz

3.84 TO 5.79 GHz

ASSY U1

*-A LTC6946IUFD-1

-B LTC6946IUFD-2

-C LTC6946IUFD-3

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0402

ALL CAPACITORS ARE IN MICROFARADS, 0402.

3.3V

SCLK

SDO

SDI

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.REBUILD WITH CHANGE

101-22-13

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.REBUILD WITH CHANGE

101-22-13

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.REBUILD WITH CHANGE

101-22-13

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

DEMO CIRCUIT 1705C

01/22/2013, 12:44 PM

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

DEMO CIRCUIT 1705C

01/22/2013, 12:44 PM

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

DEMO CIRCUIT 1705C

01/22/2013, 12:44 PM

ULTRALOW NOISE & SPURIOUS INTEGER-N

N/A LTC6946IUFD-1/-2/-3

KIM T.

MICHEL A.

SYNTHESIZER WITH INTEGRATED VCO

1uF

68nH

0402HPH-68NXJL

68nH

0402HPH-68NXJL

C12

0.01uF

C12

0.01uF

1uF 16V

0805C8

1uF 16V

0805

SMA-R

REF

OUT

SMA-R

REF

OUT

JP1

GND

3.3V

MUTE

JP1

GND

3.3V

MUTE

C20

100pF

C20

100pF

SMA-R

REF+

SMA-R

REF+

330uF

10V

7343

330uF

10V

7343

1uF

16V

0805

1uF

16V

0805

C16

2.2uF

16V

0805

C16

2.2uF

16V

0805

68nH

0402HPH-68NXJL

68nH

0402HPH-68NXJL

SMA-R

RF+

SMA-R

RF+

GND

C21

100pF

C21

100pF

330

GND

C22

0.1uF

C22

0.1uF

TUNETUNE

C13

0.1uF

C13

0.1uF

3.3V

STATUS

C19

0.01uF

C19

0.01uF

U1 *

REFO

TUNE 15

STAT

MUTE

SCLK

V+D

SDO

RF+

RF-

GNDB

TB 16

GNDC 17

V+RF

V+REFO

SDI

CMc 18

CMb 19

CMa 20

GNDA 21

V+VCO 22

GNDD 23

V+CP 24

CP 25

V+REF 26

REF+ 27

REF- 28

GND 29

0.01uF

CI2

6800pF

0805

CI2

6800pF

0805

2700pF

0603

2700pF

0603

C15

0.01uF

C15

0.01uF

C14

0.022uF

C14

0.022uF

SMA-R

RF-

SMA-R

RF-

CI1

0.022uF

0603

CI1

0.022uF

0603

51.1

C17

0.1uF

C17

0.1uF

C10

330uF

10V

7343

C10

330uF

10V

7343

SML-010VT

RED

SML-010VT

RED

2 1

C11

1uF

C11

1uF

C18

1uF

16V

0805

C18

1uF

16V

0805

453

0603

453

0603

1uF

16V

0805

1uF

16V

0805

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.

D D

C C

B B

A A

0603

NOTE: EEPROM FOR BOARD IDENTIFICATION

DC590 SPI INTERFACE

3.3V

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

DEMO CIRCUIT 1705C

01/22/2013, 12:44 PM

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

DEMO CIRCUIT 1705C

01/22/2013, 12:44 PM

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

DEMO CIRCUIT 1705C

01/22/2013, 12:44 PM

ULTRALOW NOISE & SPURIOUS INTEGER-N

N/A LTC6946IUFD-1/-2/-3

KIM T.

MICHEL A.

SYNTHESIZER WITH INTEGRATED VCO

R11 100R11 100

C23 0.1uFC23 0.1uF

CSCS

0.1uF

R12

100

R12

100

R10

100

R10

100

V+DIGV+DIG

200K

SDOSDO

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

200K

R15

EEPROM

ARRAY

24LC025-I /ST

EEPROM

ARRAY

24LC025-I /ST

SDA

VCC 8

1A1

2A2

GND

SCL

200K

C24

0.1uF

C24

0.1uF

WPWP R13

200K

R13

200K

EEGNDEEGND

GND

DIR

VCC(A) VCC(B)

74LVC1T45GW

GND

DIR

VCC(A) VCC(B)

74LVC1T45GW

1 6

4.99K

SDISDI

C25

0.1uF

C25

0.1uF

R16

100

R16

100

GND VCC

NC7WZ17P6X

GND VCC

NC7WZ17P6X

1 6

4.99K

C26

0.1uF

C26

0.1uF

R14

4.99K

R14

4.99K

SCLKSCLK

GND VCC

NC7WZ17P6X

GND VCC

NC7WZ17P6X

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dc1705cfa

DEMO MANUAL DC1705C

layout

The top metal layer of the DC1705C is shown here as an example of good PCB layout for the LTC6946.

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Table of contents

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