Linear Technology DC1649A Guida rapida alla configurazione

dc1649afa

DEMO MANUAL DC1649A

DESCRIPTION

LTC6945

Ultralow Noise and Spurious

Integer-N Synthesizer

Demonstration circuit 1649A features the LTC

6945, an

ultralow noise and spurious integer-N synthesizer.

DC1649A provides 50Ω SMA connectors for the reference

frequency (REF+), the reference output buffer (REFO),

and the two single-ended RF outputs (RF+ and RF–). 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.

Demonstration circuit 590 is used for SPI communication

with the LTC6945, controlled by the supplied PLLWizard™

software.

Design files for this circuit board are available at

http://www.linear.com/demo

Figure 1. DC1649A Inputs and Outputs

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dc1649afa

DEMO MANUAL DC1649A

TYPICAL DC1649A REQUIREMENTS AND CHARACTERISTICS

QUICK START PROCEDURE

PARAMETER INPUT OR OUTPUT PHYSICAL LOCATION DETAILS

3.3V Power Supply Input J9 and J10 Banana Jacks Low Noise and Spur-Free 3.3V, 95mA

5V Charge Pump Power Supply Input J11 and J12 Banana Jacks Low Noise and Spur-Free 5V, 35mA

5V VCO Power Supply Input “V+VCO” Turret Low Noise and Spur-Free 5V, 18mA

REF+, Reference Frequency Input J2 SMA Connector Low Noise 10MHz or 100MHz*, 6dBm into

50Ω, See Note 1

REFO, Buffered Reference Output J1 SMA Connector Frequency = fREF, 0dBm

RF+ and RF– Two Outputs J6 and J7 SMA Connectors 902MHz to 928MHz* in 250kHz* Steps, 0dBm

Loop Bandwidth Set by Loop Filter Component Values 7kHz*

*These frequencies are for the “DC1649A-10MHz.pllset “or” DC1649A-100MHz.pllset” files and included VCO.

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 250kHz. For example, if a

20MHz clock is used, Fref should be changed to 20MHz and R_DIV to 80.

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

LTC6945 data sheet.

The DC590 and PLLWizard application are required to

control the DC1649A through a personal computer (PC).

DC590B Configuration

The DC590’s QuikEval™ drivers must be installed before

the DC590 will be able to communicate with the LTC6945.

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 DC1649A.

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.

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dc1649afa

DEMO MANUAL DC1649A

QUICK START PROCEDURE

Figure 2. DC590 Jumper and Connector Locations

PLLWizard Installation

The PLLWizard software is used to communicate with

the LTC6945 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:

nWindows Operating System: Windows XP, Windows

2003 Server, Windows Vista, Windows 7

nMicrosoft .NET 2.0 or later

nWindows Installer 3.1 or later

nLinear 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 Windows Vista and Windows 7 have at least version

3.5 preinstalled.

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.

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.

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dc1649afa

DEMO MANUAL DC1649A

QUICK START PROCEDURE

Table 1. 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)

nChoose 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.

nChoose 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.

DC1649A Configuration

1. Connect an appropriate reference frequency source (at

J2) and signal analyzers (at J6 and/or J7) using the

SMA connectors (see Figure 1 and the Typical DC1649A

Requirements and Characteristics table).

2. Choose theMUTE jumpersetting:JP1- GND/3.3V MUTE

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

un-mute.

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

“V+VCO” turret to a power supply and apply power (see

Figure 1 and the Typical DC1649A Requirements and

Characteristics table).

4. Connect the DC590 to the DC1649A with the provided

ribbon cable.

5. Run the PLLWizard application.

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

“DC1649A-10MHz.pllset” or “DC1649A-100MHz.pllset”

file foundin thePLLWizard installation directory (typically

Program Files →LTC →PLLWizard →Set Files).

The red LED on DC1649A should turn on indicating that

the loop is locked at 914MHz.

Troubleshooting

If the red LED does not illuminate, follow the instructions

below:

1. Verify that you are able to communicate with the

DC1649A. The bottom status line in PLLWizard should

read “LTC6945” and “Comm Enabled”. Refer to PLL-

Wizard’s Troubleshoot and Help if not.

2. Verify that the 3.3V, 5V and “V+VCO” have the correct

voltages on them and that the reference frequency is

applied to the REF+ SMA input.

If the red LED is on but you cannot detect an RF out-

put, make sure jumper JP1 is at the 3.3V position. Run

Help →Troubleshoot in PLLWizard if the problem is not

resolved.

Figure 3. PLLWizard Screenshot

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dc1649afa

DEMO MANUAL DC1649A

DC1649A RECONFIGURATION

DC1649A is flexible and allows the use of a variety of VCOs

and the choice to employ either an active or passive loop

filter. The following covers the hardware reconfiguration of

DC1649A. Refer to PLLWizard’s Help and the LTC6945 data

sheet to better understand how to change programmed

parameters on the DC1649A.

Installing Different Tunable Devices

DC1649A permits the use of different tunable oscillators,

like VCOs and VCXOs. There are two different oscillator

footprints on the board: U3, which accommodates the

popular 0.5in ×0.5in package, and U4, which accom-

modates another common 14mm ×9mm package with

four or six pins. An external connectorized VCO can also

drive the LTC6945 through J5. Table 2 gives options to

customize the DC1649’s VCOs. When using an active loop

filter, an additional pole is required in the loop filter to limit

the op amp’s noise contribution to the VCO phase noise.

Selecting Loop Filter Type

DC1649A can use either an active or a passive loop filter,

depending upon the application. Some VCO tuning volt-

age ranges are greater than the LTC6945 charge pump

voltage range (refer to the LTC6945 data sheet). In such

cases, an active loop filter using an op amp can deliver

the required tuning voltage. Table 3 summarizes these op-

tions. PLLWizard helps determine the component values

listed in this table.

Table 2. Oscillator Options

TUNABLE

DEVICE

SELECTION

COMPONENTS

RESISTOR FOR

ADDITIONAL POLE

CAPACITOR FOR

ADDITIONAL POLE POWER

ENABLE PIN OR

REMARKS

U3 C26 ≅100pF, depopulate

R17, C25 and C28

R10 = 0Ω for passive

loop filter

R10 ≅100Ω for active

loop filter

C27 = Open for passive

loop filter

Pick C27 such that

1/(2π • R10 • C27) ≅15 •

the loop bandwidth in Hz

for active loop filter

Determined by U3

device power supply

specification, up to 24V

applied to “V+VCO” turret

U4 C28 ≅100pF, depopulate

R10, C25 and C26

R17 = 0Ω for passive

loop filter

R17 ≅100Ω for active

loop filter

C32 = Open for passive

loop filter

Pick C32 such that

1/(2π • R17 • C32) ≅15 •

the loop bandwidth in Hz

for active loop filter

Determined by U4

device power supply

specification, up to 24V

applied to “V+VCXO”

turret

Use “EN” turret to control

pin 2 of U4

External C25 ≅100pF, R15 = 0Ω,

depopulate R13, C26

and C28

Selection components

are for an active loop

filter. Connect the external

VCO output to J5. Use

“CPGAIN” to tune the

external device

Table 3. Loop Filter Options

LOOP FILTER

TYPE

SELECTION

RESISTORS

RZ FROM

PLLWizard

CI FROM

PLLWizard

CP FROM

PLLWizard POWER

CPINV BOX, SYSTEM

TAB IN PLLWizard

Passive R14 and R16 = 0Ω,

depopulate R13 and

R15

RZ_P CI1_P in parallel

with CI2_P

CP_P None Unchecked

Active R13 (except when

using an external

VCO) and R15 = 0Ω,

depopulate R14 and

R16

RZ_A CI1_A in parallel

with CI2_A

CP_A Determined by the

maximum allowed

tune voltage of the

populated VCO (U3

or U4), up to 24V

applied to “V+OA”

turret

Checked

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dc1649afa

DEMO MANUAL DC1649A

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 0 CI1_P, CI1_A, C27, C32, CP_A Opt., 0603

2 0 CI2_A Opt., 1206

3 1 CI2_P Cap., C0G, 0.1μF, 50V, 5%, 1206 Murata, GRM31C5C1H104JA01L

4 1 CP_P Cap., X7R, 8200pF, 50V, 10%, 0603 Murata, GRM188R71H822KA01D

5 3 C1, C19, C33 Cap., Tantalum, 47μF, 35V, 10%, 7361 AVX, TAJV476K035RNJ

6 4 C2, C6, C21, C35 Cap., X7R, 0.1μF, 50V, 10%, 0805 AVX, 08055C104KAT2A

7 2 C3, C16 Cap., Tantalum, 330μF, 10V, 10%,7343 AVX, TPME337K010R0035

8 10 C4, C11, C17, C24, C30, C36, C39,

C41, C43, C44

Cap., X5R, 0.1μF, 10V, 10%, 0402 AVX, 0402ZD104KAT2A

9 4 C5, C12, C18, C31 Cap., X5R, 1μF, 10V, 10%, 0402 AVX, 0402ZD105KAT2A

10 1 C7 Cap., Tantalum, 47μF, 20V, 10%, 7343 AVX, TAJD476K020RNJ

11 2 C8, C15 Cap., X7R, 470pF, 50V, 10%, 0402 AVX, 04025C471KAT2A

12 3 C23, C34, C45 Cap., X7R, 0.01μF, 16V, 10%, 0402 AVX, 0402YC103KAT2A

13 0 C25, C28 Opt., 0402

14 5 C26, C29, C37, C38, C42 Cap., NPO, 100pF, 16V, 10%, 0402 AVX, 0402YA101KAT2A

15 1 D1 LED, RED Panasonic, LN1251CTR

16 10 E3, E6, E11-E18 Turret, Testpoint, 2501 Mill-Max, 2501-2-00-80-00-00-07-0

17 1 JP1 Headers, 3 Pins, 2mm Ctrs. Samtec, TMM-103-02-L-S

18 1 XJP1 Shunt, 2mm Ctrs. Samtec, 2SN-BK-G

19 5 J1, J2, J5, J6, J7 Con., SMA 50Ω Edge-Launch E. F. Johnson, 142-0701-851

20 0 J3, J4 Con., SMA 50Ω Straight Mount Opt.

21 1 J8 Con., Header, 14 Pin, 2mm Molex, 87831-1420

22 4 J9, J10, J11, J12 Jack, Banana Keystone, 575-4

23 0 L1 Opt., 0402

24 2 L2, L3 Ind., Wirebound, 68nH, ±5%, 0402 Coilcraft, 0402HPH-68NXJL

25 1 RZ_P Res., Chip, 806, 1/10W, 1%, 0603 Vishay, CRCW0603806RFKEA

26 5 R1, R2, R25, R26, R27 Res., Chip, 4.99k, 1/16W, 1%, 0402 Vishay, CRCW04024K99FKED

27 1 R4 Res., Chip, 330, 1/16W, 1%, 0402 Vishay, CRCW0402330RFKED

28 1 R5 Res., Chip, 51.1, 1/16W, 1%, 0402 Vishay, CRCW040251R1FKED

29 4 R7, R8, R18, R19 Res., Chip, 200k, 1/16W, 1%, 0402 Vishay, CRCW0402200KFKED

30 4 R9, R10, R14, R16 Res., Chip, 0Ω, 0603 Vishay, CRCW06030000Z0EA

31 3 R12, R21, R22 Res., Chip, 100, 1/16W, 1%, 0402 Vishay, CRCW0402100RFKED

32 0 R13, R15, R17, RZ_A Opt., 0603

33 0 R23, R24 Res., Chip, 0402, Opt.

34 1 U1 I.C. LTC6945IUFD, QFN28UFD Linear Technology Corp., LTC6945IUFD

35 1 U2 Low Noise Amp, S0-8 Linear Technology Corp., LT1678CS8#PBF

36 1 U3 (1 Reel + 1 Tape, PbF) Voltage Controlled Oscillator – VC0 Crystek, CVCO55CL-0902-0928

37 0 U4 Crystal Oscillator, Opt.

38 2 U5, U6 I.C., Dual Buffer, SC-70 6-Lead Fairchild Semi., NC7WZ17P6X

39 1 U7 I.C., Dual Transceiver, SC-70 6-Lead NXP, 74LVC1T45GW

40 1 U8 I.C., Serial EEPROM, TSSOP-8 Mircochip, 24LC24A-I/ST

41 4 4 Corners Standoff, Nylon, 0.50, 1/2" Keystone, 8833 (Snap On)

42 2 Stencils (Top and Bottom) Stencil, DC1649A-4

PARTS LIST

Number of Boards = 325

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dc1649afa

DEMO MANUAL DC1649A

SCHEMATIC DIAGRAM

A A

B B

C C

D D

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0402

ALL CAPACITORS ARE IN MICROFARADS, 0402.

3.3V

GND

0805 7343

MUTE

7343

VCO

902 - 928 MHz

ASSY U3

-A CVCO55CL-0902-0928

3.3V

3.3V 3.3V

V+VCO

V+VCXO

3.3V

V+VCO

3.3V

V+OA

SCLK

SDO

SDI

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION4 11-01-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION4 11-01-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION4 11-01-11

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

11/01/2011, 02:18 PM

ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER

KIM T.

MICHEL A.

N/A

LTC6945IUFD

DEMO CIRCUIT 1649A

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

11/01/2011, 02:18 PM

ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER

KIM T.

MICHEL A.

N/A

LTC6945IUFD

DEMO CIRCUIT 1649A

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

11/01/2011, 02:18 PM

ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER

KIM T.

MICHEL A.

N/A

LTC6945IUFD

DEMO CIRCUIT 1649A

E18 EN

C32

OPT

0603

C32

OPT

0603

C27

OPT

0603

C27

OPT

0603

C16

330uF

10V

C16

330uF

10V

R14 0

0603

R14 0

0603

JP1JP1

R16

0603

R16

0603

E12 CPGAIN

C31 1.0uF

J12 GND

C23

0.01uF

C23

0.01uF

C15 470pFC15 470pF

RF- J7

RF-

C33 35V

47uF

7361

C33 35V

47uF

7361

RZ_P

806

0603

RZ_P

806

0603

1.0uF

OPT J3

OPT

470pF

470pF C17

0.1uF

C17

0.1uF

4.99K

0.1uF 0805

C45

0.01uF

C45

0.01uF

E13 V+VCO

C12

1.0uF

C12

1.0uF

C11

0.1uF

C11

0.1uF J4 CPGAIN

OPTJ4 CPGAIN

OPT

CI2_A OPT

1206

CI2_A OPT

1206

J5 EXT VCO IN

R17

OPT

0603

R17

OPT

0603

R5 51.1R5 51.1

3.3V J9

3.3V

REF0 J1

REF0

CP E3

C6 0.1uF

0805

C6 0.1uF

0805

4.99K

C1 35V

47uF

7361

C1 35V

47uF

7361

E15 V+VCXO

C38

100pF

C38

100pF

LN1251C

C21 0.1uF

0805

C21 0.1uF

0805 R23 OPTR23 OPT

CP_A

OPT 0603

CP_A

OPT 0603

CI2_P 0.1uF

1206

CI2_P 0.1uF

1206

C24

0.1uF

C24

0.1uF

C29

100pF

C29

100pF

E11 V+OA

C30

0.1uF

C30

0.1uF

CI1_A OPT

0603

CI1_A OPT

0603

C25

OPT

C25

OPT

LT1678IS8

OUTA

-INA

+INA

V-

+INB

-INB

OUTB

V+

E17 GND

R15

OPT

0603

R15

OPT

0603

CI1_P OPT

0603

CI1_P OPT

0603

R24 OPT

C18

1.0uF

C18

1.0uF

J6 RF+

OPT

VTUNE

GND

3RFOUT 4

NC 5

VCC 6

J11 5V

68nH

C34 0.01uF

330uF

10V

330uF

10V

C28 OPTC28 OPT

C35 0.1uF

0805

C35 0.1uF

0805

U3U3

GND 1

VTUNE 2

GND 3

GND 4

GND

5GND

6GND

7GND

GND

9RFOUT

10 GND

11 GND

GND 13

VCC 14

GND 15

GND 16

R13 OPT

0603

R13 OPT

0603

LTC6945IUFD

REFO

VCO- 15

STAT

MUTE

SCLK

V+D

SDO

RF+

12 RF-

11 GNDA

VCO+ 16

GNDB 17

V+RF

V+REFO

SDI

6GNDC 18

GNDD 19

GNDE 20

GNDF 21

V+VCO 22

GNDG 23

V+CP 24

CP 25

V+REF 26

REF+ 27

REF- 28

GND 29

0.1uF

REF+ J2

REF+

STATUS E6

STATUS

68nH

C19

35V

47uF

7361

C19

35V

47uF

7361

C26 100pFC26 100pF

C42

100pF

C42

100pF

CP_P

8200pF

0603

CP_P

8200pF

0603

OPT

E14 GND

R10

0603

R10

0603

C37

100pF

C37

100pF

E16 GND

J10

GND J10

GND

RZ_A OPT

0603

RZ_A OPT

0603

C7 20V

47uF

7343

C7 20V

47uF

7343

330

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dc1649afa

DEMO MANUAL DC1649A

SCHEMATIC DIAGRAM

Note: The buffers shown on sheet 2 of 2 of the schematic are used to

protect the LTC6945 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 LTC6945. The EEPROM is for identification and is not

needed to program the LTC6945.

4 4

3 3

DC590B SPI INTERFACE

0603

NOTE: EEPROM FOR BOARD IDENTIFICATION

3.3V

SCLK

SDI

SDO

SIZE

DATE:

.VER.ONCI

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

11/01/2011, 02:27 PM

ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER

KIM T.

MICHEL A.

N/A

LTC6945IUFD

DEMO CIRCUIT 1649A

SIZE

DATE:

.VER.ONCI

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

11/01/2011, 02:27 PM

ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER

KIM T.

MICHEL A.

N/A

LTC6945IUFD

DEMO CIRCUIT 1649A

SIZE

DATE:

.VER.ONCI

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

11/01/2011, 02:27 PM

ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER

KIM T.

MICHEL A.

N/A

LTC6945IUFD

DEMO CIRCUIT 1649A

C44

0.1uF

C44

0.1uF

SDOSDO

200K

R26

4.99K

R26

4.99K

EEPROM

ARRAY

24LC025-I /ST

EEPROM

ARRAY

24LC025-I /ST

SDA

VCC 8

1A1

2A2

GND

7SCL

SCLKSCLK

GND VCC

NC7WZ17P6X

GND VCC

NC7WZ17P6X

1 6

WPWP

200K

R27

4.99K

R27

4.99K

GND

DIR

VCC(A) VCC(B)

74LVC1T45GW

GND

DIR

VCC(A) VCC(B)

74LVC1T45GW

1 6

R22 100R22 100

SDISDI

V+DIGV+DIG CSCS

C39

0.1uF

C39

0.1uF

C41 0.1uFC41 0.1uF

R25

4.99K

R25

4.99K

GND VCC

NC7WZ17P6X

GND VCC

NC7WZ17P6X

1 6

R21

100

R21

100

C36

0.1uF

C36

0.1uF

EEGNDEEGND

C43

0.1uF

C43

0.1uF

R12

100

R12

100

R18

200K

R18

200K

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

3GND

13 GND

R19

200K

R19

200K

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

dc1649afa

DEMO MANUAL DC1649A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

LAYOUT TOP LAYER

The top metal layer of DC1649A is shown here as an example of good PCB layout for the LTC6945.

dc1649afa

DEMO MANUAL DC1649A

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

LT 0112 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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