Linear Technology DC1765A Quick setup guide

dc1765af

DEMO MANUAL DC1765A

Description

LTC6957-1/LTC6957-2

Low Phase Noise, Dual LVPECL or LVDS

Output Buffer/Driver/Logic Converter

Demonstration Circuit 1765A features the LT C

6957-1/

LTC6957-2, a low phase noise, dual LVPECL or LVDS

output buffer/driver/logic converter.

The DC1765A provides 0.5" spaced SMA connectors for

the differential inputs and outputs. The inputs are termi-

nated to on-board 50Ω resistors. The LVPECL outputs

of the DC1765A-A are individually biased through 130Ω

resistors to ground and then AC-coupled. The transmis-

sion lines are 50Ω, making the outputs suitable to drive

50Ω input impedance instruments. The LVDS outputs

of the DC1765A-B are terminated with 100Ω differential

and are DC-coupled. The DC1765A allows the user to

take advantage of the shutdown and bandwidth selection

features of the LTC6957. The DC1765A can operate with

a single-ended or differential sine wave or square-wave

input signal. Supply the DC1765A with 3.3V and it is

ready to function. The DC1765A offers extra component

population options to make it compatible with different

logic signal types.

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 of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Figure 1. DC1765A Inputs and Outputs

dc1765af

DEMO MANUAL DC1765A

Quick start proceDure

The DC1765A is very straightforward to operate. Refer to

Figure 1 for the following discussion.

DC1765A Configuration

1. Applyalow-noise and low-spurious3.3Vsupplybetween

the V+ (E1) and GND (E2) turrets.

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

differential input signal to IN+ (J1) and/or IN– (J2)

SMA connectors. Refer to the LTC6957 data sheet for

appropriate input signal types and levels.

3. Connect either of the outputs (OUT1, J3 and J4 or OUT2,

J5 and J6) to a high-speed scope, spectrum analyzer or

a signal analyzer to start the evaluation of the LTC6957.

4. Configure the input bandwidth of the LTC6957 with the

use of FILTA (JP1) and FILTB (JP2) jumpers. Follow the

instructions given in the LTC6957 data sheet to choose

the correct bandwidth given an input signal.

5. Shutdown an unused output by using jumper SD1 (JP3)

to shutdown OUT1 or jumper SD2 (JP4) to shutdown

OUT2.

DC1765A Reconfiguration

The DC1765A is flexible and allows the connectivity of a

variety of input and output signal types. The DC1765A is

configured as shown in the schematic diagram. However,

the DC1765A allows the installation of different input and

output configurations to adapt to a variety of logic sig-

nals. Refer to the Applications Information section of the

LTC6957 data sheet for all possible connectivity options

that can be implemented by modifying the DC1765A.

dc1765af

DEMO MANUAL DC1765A

assembly options

Table 1. DC1765A Assembly Options

ASSEMBLY VERSION PART NUMBER OUTPUT TYPE

DC1765A-A LTC6957HMS-1 LVPECL

DC1765A-B LTC6957HMS-2 LVDS

layout top layer

The top metal layer of the DC1765A is shown here as an example of good PCB layout for the LTC6957-1/LTC6957-2.

dc1765af

DEMO MANUAL DC1765A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1765A General BOM

1 2 C6, C8 CAP., X7R, 0.01µF 50V 10%, 0603 NIC, NMC0603X7R103K50TRP

2 1 C13 CAP., X7R, 0.1µF 50V 10%, 0603 TDK, C1608X7R1H104K

3 1 C14 CAP., X5R, 1µF 25V 10%, 0603 TDK, C1608X5R1E105K

4 1 C16 CAP., TANT, 22µF 10V, 3528 AVX, TPSB226K010R0400

5 2 E1, E2 TESTPOINT, TURRET 0.094" MILLMAX, 2501-2-00-80-00-00-07-0

6 4 JP1, JP2, JP3, JP4 HEADER 1×3 079 SAMTEC, TMM-103-02-L-S

7 6 J1, J2, J3, J4, J5, J6 CONN., SMA 50Ω EDGE-LAUNCH E.F. JOHNSON, 142-0701-851

8 0 R6, R11, R14 RES., OPT 0603 OPT

9 2 R7, R15 RES., CHIP, 49.9Ω 1% 0603 VISHAY, CRCW060349R9FKEA

10 4 R16, R17, R18, R19 RES., CHIP, 330k 1% 0603 VISHAY, CRCW0603330KFKEA

11 4 SHUNTS FOR JP1-JP4 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G

12 4 STAND-OFF, NYLON 0.500 KEYSTONE, 8833 (SNAP ON)

DC1765A-A

1 1 DC1765A GENERAL BOM DC1765A

2 4 Z1, Z2, Z3, Z4 CAP., X7R, 0.01µF 50V, 0603 NIC, NMC0603X7R103K50TRP

3 4 R1, R2, R3, R4 RES., CHIP, 130Ω, 0603 VISHAY, CRCW0603130RFKEA

4 0 R20, R21 RES., 0603 OPT

5 1 U1 IC, LTC6957HMS-1, MS12 LINEAR TECH., LTC6957HMS-1

DC1765A-B

1 1 DC1765A GENERAL BOM DC1765A

2 4 Z1, Z2, Z3, Z4 RES., CHIP, 0Ω, 0603 VISHAY, CRCW06030000Z0EA

3 0 R1, R2, R3, R4 RES., 0603 OPT

4 2 R20, R21 RES., CHIP, 100Ω 5%, 0603 VISHAY, CRCW0603100RJNEA

5 1 U1 IC, LTC6957HMS-2, MS12 LINEAR TECH., LTC6957HMS-2

dc1765af

DEMO MANUAL DC1765A

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: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603.

GND

ASSY

LTC6957HMS-1

-A

LTC6957HMS-2-B

R1-R4

130 OHM

OPT

Z1-Z4

0.01uF

0 OHM

3.15V - 3.45V

V+

*R20-R21

OPT

100 OHM

LVPECL

LVDS

OUT1+

OUT1-

OUT2-

OUT2+

V+

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION3 08-16-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION3 08-16-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION3 08-16-12

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

08/16/2012, 06:45 PM

LOW PHASE NOISE, DUAL LVPECL OR LVDS OUTPUT

KIM T.

MICHEL A.

N/A

LTC6957HMS-1 / -2

DEMO CIRCUIT 1765A

BUFFER / DRIVER / LOGIC CONVERTER

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

08/16/2012, 06:45 PM

LOW PHASE NOISE, DUAL LVPECL OR LVDS OUTPUT

KIM T.

MICHEL A.

N/A

LTC6957HMS-1 / -2

DEMO CIRCUIT 1765A

BUFFER / DRIVER / LOGIC CONVERTER

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

08/16/2012, 06:45 PM

LOW PHASE NOISE, DUAL LVPECL OR LVDS OUTPUT

KIM T.

MICHEL A.

N/A

LTC6957HMS-1 / -2

DEMO CIRCUIT 1765A

BUFFER / DRIVER / LOGIC CONVERTER

SMA-R

OUT1-

SMA-R

OUT1-

JP3

SD1

JP3

SD1

SMA-R

IN+

SMA-R

IN+

U1U1

GND

IN-

IN+

V+

FILTA

OUT1- 10

OUT2- 9

OUT2+ 8

SD2 7

FILTB

OUT1+ 11

SD1 12

JP1

FILTA

JP1

FILTA

R20

OPT

C13

0.1uF

C13

0.1uF

C14

1uF

C14

1uF

0.01uF

C16

22uF

3528 10V

C16

22uF

3528 10V

R15

49.9

R15

49.9

R14

OPT

R14

OPT

E2E2

SMA-R

OUT1+

SMA-R

OUT1+

R11

OPT

R11

OPT

R19

330k

R19

330k

49.9

0.01uF

JP2

FILTB

JP2

FILTB

R18

330k

R18

330k

R17

330k

R17

330k

E1E1

R21

SMA-R

IN-

SMA-R

IN-

SMA-R

OUT2+

SMA-R

OUT2+

JP4

SD2

JP4

SD2

SMA-R

OUT2-

SMA-R

OUT2-

R16

330k

R16

330k

dc1765af

DEMO MANUAL DC1765A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0213 • 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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