Linear Technology DC1959B Quick setup guide

dc1959bfa

DEMO MANUAL DC1959B

LOOP FILTER

COMPONENTS

RIBBON CABLE

CONNECTION

TO DC590

3.3V DC SUPPLY,

BANANA JACKS

MUTE

JUMPER

DIFFERENTIAL

OUTPUT, SMA

5V DC SUPPLY,

BANANA JACKS

FREQUENCY

REFERENCE

INPUT, SMA

Description

LTC6948

Ultralow Noise and Spurious Fractional-N

Synthesizer with Integrated VCO

Demonstration circuit 1959B features the LTC6948, an

Ultralow Noise and Spurious Fractional-N Synthesizer

with Integrated VCO.

There are four options of the DC1959B, one for each ver-

sion of the LTC6948. Table 1 summarizes the available

DC1959B options.

The DC1959B provides 50Ω SMA connectors for the ref-

erence frequency input fREF (REF+IN) and the differential

RF output (RF+ and RF–).

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

FracNWizard is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

A DC590 USB serial controller board is used for SPI com-

munication with the LTC6948, controlled by the supplied

FracNWizard™ software.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1959B

Figure 1. DC1959B Connections

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dc1959bfa

DEMO MANUAL DC1959B

Quick start proceDure

The DC1959B is easy to set up to evaluate the performance

of the LTC6948. Follow the procedure below.

The DC590 and FracNWizard application are required to

control the DC1959B through a personal computer (PC).

DC590 Configuration

Place the DC590 jumpers in the following positions (refer

to Figure 2):

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.

Connect the DC590 to one of your computer’s USB ports

with the included USB cable.

FracNWizard Installation

The FracNWizard software is used to communicate with

the LTC6948 synthesizer. It uses the DC590 to translate

between USB and SPI-compatible serial communica-

tions formats. It also includes advanced PLL design and

simulation capabilities. The following are the FracNWizard

system requirements:

nWindows Operating System: Windows XP, Windows

2003 Server, Windows Vista, Windows 7

nMicrosoft .NET 3.5 SP1 or later

nWindows Installer 3.1 or later

nLinear Technology’s DC590 hardware

Figure 2. DC590 Jumper and Connector Locations



JP4

JUMPER

J3, USB 

CONNECTION

TO PC

JP6

JUMPERS

J4, RIBBON

CABLE



CONNECTION

TO THE



DC1959

JP5 JUMPERS

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dc1959bfa

DEMO MANUAL DC1959B

Download the FracNWizard setup file at www.linear.com/

FracNWizard.

Run the FracNWizard setup file and follow the instructions

given on the screen. The setup file will verify and/or install

Microsoft .NET and install the FracNWizard. Refer to the

Help menu for software operation.

DC1959B Configuration

1. Connecta100MHzreferencefrequencysourcetoREF+IN

(at J1) and signal analyzers to RF+ and/or RF– (at J5

and/or J4) using the SMA connectors (see Figure 1 and

the Typical DC1959B Requirements and Characteristics

table).

Be sure to terminate any unused RF output with 50Ω,

or poor spurious performance may result.

2. Choose the MUTE jumper setting:

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 to a power

supply and apply power (see Figure 1 and the Typical

DC1959B Requirements and Characteristics table).

4. Connect the DC590 to the DC1959B with the provided

ribbon cable.

5. Run the FracNWizard application.

6. In FracNWizard, click File -> Load Settings and point to

the LTC6948-1_100MHz.fracnset file in case of evaluat-

ing the LTC6948-1, for instance, or load the appropriate

file depending on which option of the LTC6948 you are

evaluating.

The red LED on the DC1959B should turn on indicating

that the loop is locked and the output is at 907MHz.

Quick start proceDure

Figure 3. FracNWizard Screenshot

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dc1959bfa

DEMO MANUAL DC1959B

assembly options

typical Dc1959b reQuirements anD characteristics

Troubleshooting

If the red LED does not illuminate, follow the instructions

below:

1. Verify that you are able to communicate with the

DC1959B.Thebottom status line inFracNWizard should

read LTC6948 and Comm Enabled as shown in Figure 3.

Refer to FracNWizard’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 inFracNWizard if theproblem is not resolved.

DC1959B Reconfiguration

You can redesign the frequency plan of the DC1959B using

FracNWizard. You can change the loop filter as found us-

ing FracNWizard by reinstalling the loop filter components

shown in Figure 1.

Quick start proceDure

Table 1. DC1959B Options and Frequency Ranges

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

DC1959B-A LTC6948IUFD-1 2.240 to 3.740 Integers 1 through 6

DC1959B-B LTC6948IUFD-2 3.080 to 4.910 Integers 1 through 6

DC1959B-C LTC6948IUFD-3 3.840 to 5.790 Integers 1 through 6

DC1959B-D LTC6948IUFD-4 4.200 to 6.390 Integers 1 through 6

PARAMETER INPUT OR OUTPUT PHYSICAL LOCATION DETAILS

3.3V Power Supply Input J6 and J7 Banana Jacks Low-Noise and Spur-Free 3.3V, 130mA

5V Power Supply Input J8 and J9 Banana Jacks Low-Noise and Spur-Free 5V, 33mA

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

Below

RF+ and RF– Tw o Outputs J4 and J5 SMA Connectors** Frequency: 907MHz*, Power: 0dBm, Frequency Range:

Depends on the Version of the LTC6948 Device – Refer to

Table 1

Loop Bandwidth – Set by Loop Filter Component Values Approximately 160kHz* Depending on the DC1959B Version

*These frequencies are for the DC1959B fracnset files included with FracNWizard.

**Any unused RF output must be terminated with 50Ω, or poor spurious performance may result.

Note: A low noise 100MHz reference frequency, such as the Wenzel 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 FracNWizard so that Fpfd is still 50MHz. For example, if a 250MHz clock is used, Fref should be

changed to 250MHz and R_DIV to 5. Ref BST and FILT under the System tab in FracNWizard 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 LTC6948 data sheet.

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dc1959bfa

DEMO MANUAL DC1959B

pcb layout

The top metal layer of the DC1959B is shown here as an example of good PCB layout for the LTC6948.

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dc1959bfa

DEMO MANUAL DC1959B

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 0 CI2 CAP., 0805 OPT

2 5 C1, C8, C9, C15, C18 CAP., X7R, 1.0µF, 16V, 10%, 0603 TDK, C1608X7R1C105K

3 2 C2, C10 CAP., TANT., 330µF, 10V, 10%, 7343 AVX, TPME337K010R0035

4 9 C3, C7, C17, C22-C27 CAP., X7R, 0.1µF, 10V, 10%, 0402 TDK, C1005X7R1A104K

5 2 C6, C11 CAP., X5R, 1.0µF, 16V, 10%, 0402 TDK, C1005X5R1C105K

6 3 C12, C13, C19 CAP., X7R, 0.01µF, 16V, 10%, 0402 AVX, 0402YC103KAT2A

7 1 C16 CAP., X5R, 2.2µF, 16V, 10%, 0603 TDK, C1608X5R1C225K

8 0 C2_F2, C28 CAP., 0603 OPT

9 2 C20, C21 CAP., X7R, 100pF, 50V, 10%, 0402 AVX, 04025C101KAT2A

10 1 D1 LED, RED PANASONIC, LN1251C-TR

11 1 E3 TURRET, TESTPOINT, 2501 MILL-MAX, 2501-2-00-80-00-00-07-0

12 1 JP1 HEADERS, 3 PINS 2mm CTRS. SAMTEC, TMM-103-02-L-S

13 3 J1, J4, J5 CON., SMA 50Ω EDGE-LAUNCH E.F. JOHNSON, 142-0701-851

14 1 J2 CON., HEADER, 14 PIN, 2mm MOLEX, 87831-1420

15 4 J6, J7, J8, J9 JACK, BANANA KEYSTONE, 575-4

16 2 L1, L2 IND., 68nH 5%, 0402 COILCRAFT, 0402HPH-68NXJLW

17 1 L1_F1 IND., 10µH, 0805 TDK, MLF2012E100K

18 0 L1_F2 IND., 0805 OPT

19 1 R1 RES., CHIP, 51.1Ω, 1/16W, 1%, 0402 NIC, NRC04F51R1TRF

20 0 R1_F2 RES., 0603 OPT

21 4 R2, R18, R19, R20 RES., CHIP, 0Ω, 0402 NIC, NRC04Z0TRF

22 1 R3 RES., CHIP, 330Ω, 1/16W, 1%, 0402 NIC, NRC04F3300TRF

23 1 R4 RES., CHIP, 15Ω, 1/16W, 1%, 0402 NIC, NRC04F15R0TRF

24 4 R5, R6, R7, R13 RES., CHIP, 200k, 1/16W, 1%, 0402 NIC, NRC04F2003TRF

25 3 R8, R9, R14 RES., CHIP, 4.99k, 1/16W, 1%, 0402 NIC, NRC04F4991TRF

26 3 R10, R11, R12, R21 RES., CHIP, 100Ω 1/16W, 5%, 0402 NIC, NRC04J101TRF

27 1 R15 RES., CHIP, 0Ω, 0603 NIC, NRC06Z0TRF

28 2 U2, U3 I.C., DUAL BUFFER, SC70-6 FAIRCHILD SEMI., NC7WZ17P6X

29 1 U4 I.C., DUAL TRANSCEIVER, SOT363 NXP, 74LVC1T45GW+125

30 1 U5 I.C., SERIAL EEPROM, TSSOP8 MICROCHIP, 24LC025-I /ST

31 1 SHUNT ON JP1 SHUNT, 2mm CTRS. SAMTEC 2SN-BK-G

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dc1959bfa

DEMO MANUAL DC1959B

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1959B-A Required Circuit Components

1 1 DC1959B GENERAL BOM

2 1 C2_F1 CAP., C0G, 2.4nF, 50V, 5%, 0603 MURATA, GRM1885C1H242JA01D

3 1 CI1 CAP., X7R, 82nF, 50V, 10%, 0603 MURATA, GRM188R71H823KA93D

4 1 CP CAP., C0G, 3.6nF, 50V, 5%, 0603 MURATA, GRM1885C1H362JA01D

5 2 R1_F1, RZ RES., CHIP, 57.6Ω, 1/16W, 1%, 0603 NIC, NRC06F57R6TRF

6 1 U1 I.C. SYNTHESIZER, QFN28UFD-4X5 LINEAR TECH., LTC6948IUFD-1

DC1959B-B Required Circuit Components

1 1 DC1959B GENERAL BOM

2 1 C2_F1 CAP., C0G, 2nF, 50V, 5%, 0603 MURATA, GRM1885C1H202JA01D

3 1 CI1 CAP., X7R, 68nF, 50V, 10%, 0603 MURATA, GRM188R71H683KA93D

4 1 CP CAP., C0G, 3nF, 50V, 5%, 0603 MURATA, GRM1885C1H302JA01D

5 2 R1_F1, RZ RES., CHIP, 63.4Ω, 1/16W, 1%, 0603 NIC, NRC06F63R4TRF

6 1 U1 I.C. SYNTHESIZER, QFN28UFD-4X5 LINEAR TECH., LTC6948IUFD-2

DC1959B-C Required Circuit Components

1 1 DC1959B GENERAL BOM

2 1 C2_F1 CAP., X7R, 1.8nF, 50V, 10%, 0603 MURATA, GRM188R71H182KA01D

3 1 CI1 CAP., X7R, 56nF, 50V, 10%, 0603 MURATA, GRM188R71H563KA93D

4 1 CP CAP., C0G, 2.4nF, 50V, 5%, 0603 MURATA, GRM1885C1H242JA01D

5 2 R1_F1, RZ RES., CHIP, 75Ω, 1/16W, 5%, 0603 VISHAY, CRCW060375R0JNEA

61 U1 I.C. SYNTHESIZER, QFN28UFD-4X5 LINEAR TECH., LTC6948IUFD-3

DC1959B-D Required Circuit Components

1 1 DC1959B GENERAL BOM

2 1 C2_F1 CAP., C0G, 1.6nF, 50V, 5%, 0603 MURATA, GRM1885C1H162JA01D

3 1 CI1 CAP., X7R, 56nF, 50V, 10%, 0603 MURATA, GRM188R71H563KA93D

4 1 CP CAP., C0G, 2.4nF, 50V, 5%, 0603 MURATA, GRM1885C1H242JA01D

5 2 R1_F1, RZ RES., CHIP, 76.8Ω, 1/16W, 1%, 0603 NIC, NRC06F76R8TRF

6 1 U1 I.C. SYNTHESIZER, QFN28UFD-4X5 LINEAR TECH., LTC6948IUFD-4

parts list

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dc1959bfa

DEMO MANUAL DC1959B

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 LTC6948-1

LTC6948-2

LTC6948-3

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0402

2. ALL CAPACITORS ARE IN MICROFARADS, 0402

LTC6948-4 4.20 TO 6.39 GHz

CI1 R1_F1, RZC2_F1 CP

3.6nF82nF 57.62.4nF

3nF68nF 63.42nF

2.4nF56nF 751.8nF

56nF 76.81.6nF 2.4nF

SUFFIX

3.3V

SCLK

SDO

SDI

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 1959B

Monday, September 21, 2015

ULTRALOW NOISE & SPURIOUS FRACTIONAL-N

N/A LTC6948IUFD-1/2/3/4

KIM T.

CHRIS P.

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 1959B

Monday, September 21, 2015

ULTRALOW NOISE & SPURIOUS FRACTIONAL-N

N/A LTC6948IUFD-1/2/3/4

KIM T.

CHRIS P.

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 1959B

Monday, September 21, 2015

ULTRALOW NOISE & SPURIOUS FRACTIONAL-N

N/A LTC6948IUFD-1/2/3/4

KIM T.

CHRIS P.

SYNTHESIZER WITH INTEGRATED VCO

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

CHRIS P.REBUILD WITH CHANGE1 09-21-15

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

CHRIS P.REBUILD WITH CHANGE1 09-21-15

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

CHRIS P.REBUILD WITH CHANGE1 09-21-15

1uF

R19

1uF 0603

C12

0.01uF

68nH

0402HPH-68NXJL

R18

C20

100pF

C2_F1

0603

JP1

GND

3.3V

MUTE

C27

0.1uF

SMA-R

REF+

C16

2.2uF

0603

R1_F1

0603

1uF

0603

330uF

10V

7343

C21

100pF

GND

SMA-R

RF+

68nH

0402HPH-68NXJL

GND

330

TUNE

C22

0.1uF

3.3V

L1_F2

OPT

0805

C28

OPT

0603

C19

0.01uF

STATUS

R20

0.1uF

R1_F2

OPT

0603

CI1

0603

SMA-R

RF-

C15

1uF 0603

0603

C2_F2

OPT

0603

CI2

OPT

0805

C13

0.01uF

C17

0.1uF

51.1

L1_F1

10uH

0805

C18

1uF

0603

U1 *

QFN28UFD-4X5

STAT

TUNE 15

MUTE

SDI

V+D

LDO

RF+

RF-

GNDA

SCLK

TB 16

GNDB 17

V+RF

REF+

SDO

CMC 18

CMB 19

CMA 20

GNDC 21

BVCO 22

V+VCO 23

GNDD 24

V+CP 25

CP 26

V+REF 27

REF- 28

GND 29

C11

1uF

LN1251C

2 1

C10

330uF

10V

7343

1uF

0603

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dc1959bfa

DEMO MANUAL DC1959B

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.

schematic Diagram

D D

C C

B B

A A

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 1959B

Monday, September 21, 2015

ULTRALOW NOISE & SPURIOUS FRACTIONAL-N

N/A LTC6948IUFD-1/2/3/4

KIM T.

CHRIS P.

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 1959B

Monday, September 21, 2015

ULTRALOW NOISE & SPURIOUS FRACTIONAL-N

N/A LTC6948IUFD-1/2/3/4

KIM T.

CHRIS P.

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 1959B

Monday, September 21, 2015

ULTRALOW NOISE & SPURIOUS FRACTIONAL-N

N/A LTC6948IUFD-1/2/3/4

KIM T.

CHRIS P.

SYNTHESIZER WITH INTEGRATED VCO

R21

100

R11 100

C23 0.1uF

0.1uF

R12

100

R10

100

V+DIG

200K

SDO

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

0603

EEPROM

ARRAY

24LC025-I /ST

SDA

VCC 8

1A1

2A2

GND

SCL

200K

C24

0.1uF

WP R13

200K

EEGND

GND

DIR

VCC(A) VCC(B)

74LVC1T45GW

1 6

4.99K

SDI

C25

0.1uF

GND VCC

NC7WZ17P6X

1 6

4.99K

C26

0.1uF

R14

4.99K

SCLK

GND VCC

NC7WZ17P6X

1 6

Note: The buffers shown on sheet 2 of 2 of the schematic are used to protect the LTC6948 when connected to the DC590 before the LTC6948 is powered up. There is no

need for such circuitry if the SPI bus is not active before powering up the LTC6948. The EEPROM is for identification and is not needed to program the LTC6948.

dc1959bfa

DEMO MANUAL DC1959B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0915 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,

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

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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