Linear Technology DC1954A Quick setup guide

dc1954af

DEMO MANUAL DC1954A

Description

LTC6954

Low Phase Noise, Triple Output Clock

Distribution Divider/Driver

Demonstration Circuit 1954A features the LT C

6954, a

Low Phase Noise, Triple Output Clock Distribution Divider/

Driver.

There are four options of the DC1954A, one for each ver-

sion of the LTC6954. Table 1 summarizes the available

DC1954A options.

The DC1954A LVPECL outputs are AC-coupled 50Ω

transmission lines making them suitable for driving 50Ω

impedance instruments. The LVDS/CMOS outputs of the

DC1954A are terminated with a 100Ω differential resistor

and are DC-coupled. All differential input and outputs have

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

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

respective owners.

0.5" spaced SMA connectors. The LTC6954’s EZSync™

function is made available via a turret and an SMA con-

nector.

ADC590 USB serial controller board is used for SPI

communication with the LTC6954, controlled by the

supplied LTC6954_GUI software.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1954A

Figure 1. DC1954A Connections





Ribbon

cable

connection

toDC590

OUT0Outputs,SMA

LTC6954‐1/‐2/‐3

LVPECL,ACcoupled



LTC6954‐4

LVDS/CMOS,DCcou

led

3.3VDCSupply,

bananajack&

turret

INInputs,SMA

ACcoupled

GND,banana

jack&turret

OUTxSELInputs,Headers

ForLVPECLOUTPUTS:

H=IBIASON;L=IBIASOFF



ForLVDS/CMOSOUTPUTS:

H=LVDS;L=CMOS

Temperature

monitoringdiode,turret

EZSyncTM

SYNCInput,

SMA&turret

OUT1Outputs,SMA

LTC6954‐1/‐2

LVPECL,ACcoupled



LTC6954‐3/‐4

LVDS/CMOS,DCcou

led

OUT2Outputs,SMA

LTC6954‐1

LVPECL,ACcoupled



LTC6954‐2/‐3/‐4

LVDS/CMOS,DCcou

led

dc1954af

DEMO MANUAL DC1954A

Quick start proceDure

The DC1954A is easy to set up to evaluate the performance

of the LTC6954. Follow the procedure below.

The DC590 and LTC6954_GUI application are required to

control the DC1954A 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 or 5V must be selected. This sets the

SPI port to 3.3V or 5V operation, 3.3V

operation is recommended.

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

with the included USB cable.

LTC6954_GUI Installation

The LTC6954_GUI software is used to communicate with

the LTC6954. It uses the DC590 to translate between USB

and SPI-compatible serial communications formats. The

following are the LTC6954_GUI system requirements:

• Windows Operating System: Windows XP, Windows

2003 Server, Windows Vista, Windows 7

• Microsoft .NET 3.5 SP1 or later

• Windows Installer 3.1 or later

• Linear Technology’s DC590 hardware

Figure 2. DC590 Jumper and Connector Locations

dc1954af

DEMO MANUAL DC1954A

Quick start proceDure

Download the LTC6954_GUI setup file at:

www.linear.com/LTC6954_GUI.

RuntheLTC6954_GUIsetupfileandfollowtheinstructions

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

Microsoft .NET and install the LTC6954_GUI.

DC1954A Configuration

1. Connect the GND and V+ 3.15V-3.45V, turrets to a

power supply and apply power (see Figure 1 and the

Typical DC1954A Requirements and Characteristics

table).

2. Connect the DC590 to the DC1954A with the provided

ribbon cable.

3. Run the LTC6954_GUI application.

4. From the LTC6954_GUI, click File -> Load Settings

and point to the LTC6954.6954set ﬁle.

5. From the LTC6954_GUI, select the Read All button.

This will update the GUI to display the correct part

number and associated output types.

6. Connect a low phase-noise (or jitter) single-ended or

differential signal to IN+ (J8) and/or IN- (J9). Refer to

the LTC6954 data sheet for acceptable input frequen-

cies and amplitudes.

7. From the LTC6954_GUI, update Fin to the frequency

of the input signal in step 6. This will update the

LTC6954_GUI with the correct output frequencies.

8. Refer to the Typical DC1954A Requirements and

Characteristics table for desired OUTxSEL level. Set

JP1, JP2 and JP3 accordingly.

9. Connect desired output (OUT0, OUT1, OUT2) to a test

instrument or other demo board to evaluate perfor-

mance. [The LVDS/CMOS outputs are DC-coupled,

please make sure the levels do not exceed the test

equipment input levels].

10. To synchronize outputs provide a 1ms or greater

high pulse to the SYNC SMA to take advantage of the

EZSync function.

Be sure to power down or terminate any unused RF output

with 50Ω, or poor spurious performance may result.

Figure 3. LTC6954_GUI Screenshot

dc1954af

DEMO MANUAL DC1954A

Troubleshooting

If the board is not functioning as expected, follow the

instructions below:

1. Verify that you are able to communicate with the

DC1954A. The bottom status line in LTC6954_GUI

should read LTC6954 and Comm Enabled.

2. Verify that V+ 3.15V-3.45V turret has the correct

voltage. (see the Typical DC1954A Requirements and

Characteristics table).

3. Ensure JP1, JP2, and JP3 are set to desired position.

4. Iftheoutputtypeis LVPECLandthe outputisAC-coupled,

OUTxSEL must be high for proper signal swing.

The DC1954A allows for a variety of input and output

configurations. The following covers the hardware recon-

figuration of the DC1954A.

LVPECL Output Options

The

DC1954A LVPECL outputs are AC-coupled and require

internal biasing (OUTxSEL=H) with the default termination

network. The DC1954A provides pull-down, series and a

differential termination resistor options to accommodate

the other LVPECL termination networks described in the

data sheet.

LVDS/CMOS Output Options

The LVDS/CMOS outputs are DC-coupled and have an on

boarddifferential100Ω resistor termination by default. The

DC1954A provides pull-down, series and a differential ter-

mination resistor options to accommodate the other LVDS/

CMOS termination networks described in the data sheet.

Table 1. DC1954A Assembly Options

ASSEMBLY VERSION U1 PART NUMBER OUT0+/– OUT1+/– OUT2+/–

DC1954A-A LTC6954IUFF-1 LVPECL LVPECL LVPECL

DC1954A-B LTC6954IUFF-2 LVPECL LVPECL LVDS/CMOS

DC1954A-C LTC6954IUFF-3 LVPECL LVDS/CMOS LVDS/CMOS

DC1954A-D LTC6954IUFF-4 LVDS/CMOS LVDS/CMOS LVDS/CMOS

5. Iftheoutput typeisLVDS,theoutputsmustbe AC-coupled

intosingle-ended,50Ωinputtestequipment.Additionally,

the unconnected output must be AC-coupled into a 50Ω

load to ground to provide a balanced output load. If the

LVCSx bit is low, the signal amplitude at the instrument

will be approximately half of the data sheet value due to

the existing 100Ω termination on the demo board.

6. If the output is CMOS, a 200Ω series resistor must be

included to limit the output current when connecting

to the 50Ω input on test equipment. The signal swing

at the instrument is then approximately 20 percent of

the data sheet value.

Contact the factory for further troubleshooting.

Input Options

The inputs have a 50Ω termination resistor to GND and are

AC-coupled by default. The DC1954A provides pull-down,

pull-up and a differential termination resistor options to

accommodate the other input termination networks de-

scribed in the data sheet.

Clock Follower Input Network

When using the DC1954A as a clock follower, EZSync

requires the LTC6954 inputs to be taken to a low state

while the SYNC pin is high. To meet this requirement, the

DC1954A must be modified to support DC-coupling. Refer

to the EZSync Function section and to the data sheet for

more details on using the LTC6954 as a clock follower.

EZSync Function

Apply a 1ms or greater high pulse to the SYNC SMA con-

nector to take advantage of the EZSync function. Refer

to the LTC6954 data sheet for SYNC timing and level

requirements.

Quick start proceDure

Dc1954a reconfiguration

assembly options

dc1954af

DEMO MANUAL DC1954A

typical Dc1954a reQuirements anD characteristics

pcb layout

PARAMETER INPUT OR OUTPUT PHYSICAL LOCATION DETAILS

3.3V Power Supply Input J11 and J10 Banana Jacks, or 3.15V-3.45V and

GND Turrets

Low-Noise and Spur-Free 3.3V, ≥400mA Capable Power

Supply; Typically DC1954 Consumes ~300mA; Powers

LTC6954, U2, U3, and U4

OUT0+, OUT0– Tw o Outputs J1 and J2 SMA Connectors* Refer to Figure 1 or Table 1 for Output Type

If LVPECL: AC-Coupled

If LVDS/CMOS: DC-Coupled

Refer to LTC6954 Data Sheet for Output Levels for LVPECL, or

LVDS/CMOS Option

OUT1+, OUT1– Tw o Outputs J3 and J4 SMA Connectors*

OUT2+, OUT2– Tw o Outputs J5 and J6 SMA Connectors*

OUT0SEL Input JP1 3-Pin Headers If LVPECL:

OUTxSEL=H: IBIAS=ON, for Default LVPECL BOM

OUTxSEL=L: IBIAS=OFF, Must Install External Pull-Down

Resistor, Refer to schematic

If LVDS/CMOS:

OUTxSEL=H: LVDS, Default LVDS/CMOS BOM

OUTxSEL=L: CMOS, Remove 100Ω Differential Termination,

Refer to Schematic

OUT1SEL Input JP2 3-Pin Headers

OUT2SEL Input JP3 3-Pin Headers

TEMP Input/Output Turret Temperature Monitoring Diode; Force Current Measure

Voltage, Refer to Data Sheet

TEMP GND Input Turret

SYNC Input J7 SMA Connector and Turret EZSync, 0V to 3.3V Control Signal, Refer to the Data Sheet

IN+, IN– Input J8 and J9 SMA Connectors Input Signal Pins

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

Top Layer

dc1954af

DEMO MANUAL DC1954A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

2 17 C1-C10, C12, C13, C22-C24, C28, C29 CAP., X7R, 0.1µF, 10V, 10%, 0402 AVX, 0402ZC104KAT2A

3 1 C14 CAP., X7R, 1.0µF, 16V, 10%, 0603 AVX, 0603YC105KAT2A

4 9 C15, C17-C21, C25-C27 CAP., X7R, 0.01µF, 6.3V, 10%, 0201 MURATA, GRM033R70J103KA01D

5 1 C16 CAP., TANT, 22µF 10V, 3528 AVX, TPSB226K010R0400

6 3 E9, E12, E13 TURRET, 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0

7 2 E10, E11 TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

8 3 JP1, JP2, JP3 JMP, 3 PINS 2mm CTRS. SAMTEC, TMM-103-02-L-S

9 8 J1-J6, J8, J9 CONN., SMA 50Ω EDGE-LAUNCH EMERSON, 142-0701-851

10 1 J7 CONN, SMA STRAIGHT CONNEX, 132134

11 2 J10, J11 JACK, BANANA KEYSTONE, 575-4

12 1 J12 CONN., HEADER 14POS 2mm VERT GOLD MOLEX, 87831-1420

13 6 R2, R4, R7, R9, R12, R14 RES., CHIP, 0Ω, 5% 0402 NIC, NRC04Z0TRF

14 0 R3, R5, R8, R10, R13, R15-R17, R19 RES., CHIP, 0402 OPT

15 2 R18, R20 RES., CHIP, 49.9Ω, 1/16W, 1%, 0402 NIC, NRC04F49R9TRF

16 5 R22, R35, R37-R39 RES., CHIP, 200k, 1/16W, 1%, 0402 NIC, NRC04F2003TRF

17 3 R23, R24, R25 RES., CHIP, 4.99k, 1/16W, 1%, 0402 NIC, NRC04F4991TRF

18 1 R26 RES., CHIP, 0Ω, 0603 NIC, NRC06Z0TRF

19 0 R27-R29, R30-R32 RES., CHIP, 0603 OPT

20 4 R33, R34, R36, R40 RES., CHIP, 100Ω, 1/16W, 5%, 0402 NIC, NRC04J101TRF

21 2 U2, U3 I.C., DUAL BUFFER, SC70-6 FAIRCHILD SEMI., NC7WZ17P6X

22 1 U4 I.C., DUAL TRANSCEIVER, SOT363 NXP, 74LVC 1T45GW

23 1 U5 I.C., EEPROM 2KBIT 400KHZ 8TSSOP MICROCHIP, 24LC025-I /ST

24 3 SHUNTS SHOWN ON ASSY DWG SHUNT, 2mm CTRS. SAMTEC, 2SN-BK-G

DC1954A-A Required Circuit Components

1 1 GENERAL BOM

2 0 R1, R6, R11 RES., CHIP, 0402 OPT

3 6 Z1, Z2, Z3, Z4, Z5, Z6 CAP., X7R, 0.1µF 16V, 10%, 0402 AVX, 0402YC104KAT2A

4 1 U1 I.C., QFN36UFF-4X7 LINEAR TECH., LTC6954IUFF-1#PBF

dc1954af

DEMO MANUAL DC1954A

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1954A-B Required Circuit Components

1 1 GENERAL BOM

2 0 R1, R6 RES., CHIP, 0402 OPT

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

4 4 Z1-Z4 CAP., X7R, 0.1µF 16V, 10%, 0402 AVX, 0402YC104KAT2A

5 2 Z5, Z6 RES., CHIP, 0Ω, 0402 NIC, NRC04Z0TRF

6 1 U1 I.C., QFN36UFF-4X7 LINEAR TECH., LTC6954IUFF-2#PBF

DC1954A-C Required Circuit Components

1 1 GENERAL BOM

2 0 R1 RES., CHIP, 0402 OPT

3 2 R6, R11 RES., CHIP, 100Ω 1/16W, 5%, 0402 NIC, NRC04J101TRF

4 2 Z1-Z2 CAP., X7R, 0.1µF 16V, 10%, 0402 AVX, 0402YC104KAT2A

5 4 Z3, Z4, Z5, Z6 RES., CHIP, 0Ω, 0402 NIC, NRC04Z0TRF

6 1 U1 I.C., QFN36UFF-4X7 LINEAR TECH., LTC6954IUFF-3#PBF

DC1954A-D Required Circuit Components

1 1 GENERAL BOM

2 3 R1, R6, R11 RES., CHIP, 100Ω 1/16W, 5%, 0402 NIC, NRC04J101TRF

3 6 Z1, Z2, Z3, Z4, Z5, Z6 RES., CHIP, 0Ω, 0402 NIC, NRC04Z0TRF

4 1 U1 I.C., QFN36UFF-4X7 LINEAR TECH., LTC6954IUFF-4#PBF

parts list

dc1954af

DEMO MANUAL DC1954A

schematic Diagram

D D

C C

B B

A A

ASSY U1

*-A

-B

-C

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0402

ALL CAPACITORS ARE IN MICROFARADS, 0402

-D LTC6954IUFF-4

LTC6954IUFF-3

LTC6954IUFF-2

LTC6954IUFF-1

Z1-Z2R1 Z3-Z4 Z5-Z6

0.1uF 0.1uF

0.1uF

100 OHM 0 OHM

OPEN

100 OHM 0.1uF

OPEN 0.1uF

0 OHM

100 OHM 0 OHM 0 OHM

0 OHM

0 OHMOPEN 0.1uF

OUT0SEL

OUT1SEL

OUT2SEL

100 OHM

OPEN

R11

V+

V+V+

V+ V+

V+

OUT2SELOUT1SEL

OUT0SEL

V+

OUT1SEL

V+

OUT2SEL

V+

SCLK

SDO

SDI

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION

2 10-03-13

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION

2 10-03-13

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION

2 10-03-13

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 1954A

10/03/2013, 10:30 AM

LOW PHASE NOISE, TRIPLE OUTPUT CLOCK

N/A LTC6954IUFF-1/-2/-3/-4

KIM T.

MICHEL A.

DISTRIBUTION DIVIDER/ DRIVER

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 1954A

10/03/2013, 10:30 AM

LOW PHASE NOISE, TRIPLE OUTPUT CLOCK

N/A LTC6954IUFF-1/-2/-3/-4

KIM T.

MICHEL A.

DISTRIBUTION DIVIDER/ DRIVER

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 1954A

10/03/2013, 10:30 AM

LOW PHASE NOISE, TRIPLE OUTPUT CLOCK

N/A LTC6954IUFF-1/-2/-3/-4

KIM T.

MICHEL A.

DISTRIBUTION DIVIDER/ DRIVER

SMA-R

OUT0+

SMA-R

OUT0+

R18

49.9

R18

49.9

C25

0.01uF

0201

C25

0.01uF

0201

E11

GND

E11

GND

R14

C14

1uF

0603

C14

1uF

0603

C17

0.01uF

0201

C17

0.01uF

0201

R19

OPT

R19

OPT

R17

OPT

R17

OPT

R32

0603

OPT

R32

0603

OPT

J11

3.15V - 3.45V

V+ J11

3.15V - 3.45V

V+

C23

0.1uF

C23

0.1uF

C15

0.01uF

0201

C15

0.01uF

0201

R30

0603

OPT

R30

0603

OPT JP2JP2

OPT

E10

3.15V - 3.45V

E10

3.15V - 3.45V

C24

0.1uF

C24

0.1uF

R31

0603

OPT

R31

0603

OPT

SMA-R

OUT2+

SMA-R

OUT2+

0.1uF

R27

0603

OPT

R27

0603

OPT

C22

0.1uF

C22

0.1uF

R35

200K

R35

200K

GNDGND

C28

0.1uF

C28

0.1uF

R29

0603

OPT

R29

0603

OPT

C21

0.01uF

0201

C21

0.01uF

0201

R11

0.1uF

R20

49.9

R20

49.9

C13

0.1uF

C13

0.1uF

JP1JP1

C12

0.1uF

C12

0.1uF C29

0.1uF

C29

0.1uF

SYNC

OPT

0.1uF

C20

0.01uF

0201

C20

0.01uF

0201

R12

SMA-R

OUT1+

SMA-R

OUT1+

SMA-R

OUT2-

SMA-R

OUT2-

C10

0.1uF

C10

0.1uF

SMA-R

IN-

SMA-R

IN-

C16

22uF

3528

10V

C16

22uF

3528

10V

E12

TEMP

E12

TEMP

R16

OPT

R16

OPT

U1 *

QFN36UFF-4X7

U1 *

QFN36UFF-4X7

V+OUT1 8

V+OUT0 9

OUT0- 10

OUT1- 6

OUT1+ 7

V+A

OUT2SEL

SDO 17

OUT0+ 11

V+OUT0 12

OUT0SEL 13

GND 14

IN-

GND

TEMP

V+IN

V+A 15

V+OUT2 1

SCLK

SDI

V+D

SYNC

V+A

V+IN

GND

IN+

OUT2+ 3

OUT1SEL

GND

V+OUT2 4

GND

OUT2- 2

V+D 18

CS 16

V+OUT1 5

GND

GNDGND

SMA

SYNC

SMA

SYNC

C19

0.01uF

0201

C19

0.01uF

0201

R28

0603

OPT

R28

0603

OPT

E13

GND

E13

GND

R10

OPT

R10

OPT

JP3JP3

SMA-R

OUT0-

SMA-R

OUT0-

SMA-R

OUT1-

SMA-R

OUT1-

SMA-R

IN+

SMA-R

IN+

C27

0.01uF

0201

C27

0.01uF

0201

R13

OPT

R13

OPT

R15

OPT

R15

OPT

C18

0.01uF

0201

C18

0.01uF

0201

GNDGND

C26

0.01uF

0201

C26

0.01uF

0201

J10

GND

J10

GND

dc1954af

DEMO MANUAL DC1954A

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.

Note: The buffers shown on sheet 2 of 2 of the schematic are used to protect the LTC6954 when connected to the DC590 before the

LTC6954 is powered up. There is no need for such circuitry if the SPI bus is not active before powering up the LTC6954. The EEPROM

is for identification and is not needed to program the LTC6954.

schematic Diagram

D D

C C

B B

A A

NOTE: EEPROM FOR BOARD IDENTIFICATION

DC590 SPI INTERFACE

V+

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 1954A

10/03/2013, 10:30 AM

LOW PHASE NOISE, TRIPLE OUTPUT CLOCK

N/A LTC6954IUFF-1/-2/-3/-4

KIM T.

MICHEL A.

DISTRIBUTION DIVIDER/ DRIVER

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 1954A

10/03/2013, 10:30 AM

LOW PHASE NOISE, TRIPLE OUTPUT CLOCK

N/A LTC6954IUFF-1/-2/-3/-4

KIM T.

MICHEL A.

DISTRIBUTION DIVIDER/ DRIVER

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 1954A

10/03/2013, 10:30 AM

LOW PHASE NOISE, TRIPLE OUTPUT CLOCK

N/A LTC6954IUFF-1/-2/-3/-4

KIM T.

MICHEL A.

DISTRIBUTION DIVIDER/ DRIVER

R34

100

R34

100

0.1uF

R40

100

R40

100

CSCS

0.1uF

R36

100

R36

100

R33

100

R33

100

V+DIGV+DIG

R38

200K

R38

200K

SDOSDO

J12

HD2X7-079-MOLEX

J12

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

R39

200K

R39

200K

R26

0603

R26

0603

EEPROM

ARRAY

24LC025-I /ST

EEPROM

ARRAY

24LC025-I /ST

SDA

VCC 8

1A1

2A2

GND

SCL

R22

200K

R22

200K

0.1uF

WPWP R37

200K

R37

200K

GND VCC

NC7WZ17P6X

GND VCC

NC7WZ17P6X

1 6

EEGNDEEGND

GND DIR

VCC(A) VCC(B)

74LVC1T45GW

GND DIR

VCC(A) VCC(B)

74LVC1T45GW

1 6

R24

4.99K

R24

4.99K

SDISDI

0.1uF

R23

4.99K

R23

4.99K

0.1uF

R25

4.99K

R25

4.99K

SCLKSCLK

GND VCC

NC7WZ17P6X

GND VCC

NC7WZ17P6X

1 6

dc1954af

DEMO MANUAL DC1954A

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 1014 • 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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