DC1766A-A - LINEAR TECHNOLOGY

dc1766af

DEMO MANUAL DC1766A

Description

LTC6957-3/LTC6957-4

Low Phase Noise, Dual CMOS Output

Buffer/Driver/Logic Converter

Demonstration Circuit 1766A features the LT C

6957-3/

LTC6957-4, a low phase noise, dual CMOS output buffer/

driver/logic converter.

The DC1766A provides SMA connectors for the differential

inputs and the CMOS outputs. The inputs are terminated

to on-board 50Ω resistors and the outputs present similar

impedance. The DC1766A allows the user to take advantage

of the shutdown and bandwidth selection features of the

LTC6957. The DC1766A can operate with a single-ended or

differential sine wave or square-wave input signal. Supply

the DC1766A with 3.3V and it is ready to function. Or, the

output can be powered from a lower voltage supply if a

lower voltage CMOS driver is desired. The DC1766A gives

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. DC1766A Inputs and Outputs

dc1766af

DEMO MANUAL DC1766A

Quick start proceDure

The DC1766A is very straightforward to operate. Refer to

Figure 1 for the following discussion.

DC1766A Configuration

1. Apply a low-noise and low-spurious 3.3V supply between

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

2. Make sure that jumper VDD (JP7) is at the V+ position

if 3.3V CMOS output operation is desired. Otherwise,

apply a voltage that is between 2.4V and 3.3V between

the VDD (E4) and GND (E3) turrets, and move jumper

VDD (JP7) to EXT position to operate the CMOS outputs

at the voltage level supplied at the VDD turret.

3. 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.

4. Connect either of the outputs (OUT1, J3 or OUT2, J4)

to a high-speed scope, spectrum analyzer or a signal

analyzer to start the evaluation of the LTC6957.

NOTE: The CMOS outputs of the DC1766A are AC-

coupled and attenuated through two 100Ω resistors as

shown in the DC1766A schematic diagram to present

a 50Ω source impedance appropriate to connect to a

50Ω input impedance instrument.

5. 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.

6. Shut down an unused output by using jumper SD1 (JP3)

to shutdown OUT1 or jumper SD2 (JP4) to shutdown

OUT2.

DC1766A Reconfiguration

The DC1766A is flexible and allows the connectivity of a

variety of input and output signal types. The DC1766A is

configured as shown in the schematic diagram. However,

the DC1766A 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 DC1766A.

dc1766af

DEMO MANUAL DC1766A

assembly options

Table 1. DC1766A Assembly Options

ASSEMBLY VERSION PART NUMBER OUTPUT TYPE

DC1766A-A LTC6957HMS-3 In-Phase CMOS

DC1766A-B LTC6957HMS-4 Complementary CMOS

layout top layer

The top metal layer of the DC1766A is shown here as an example of good PCB layout for the LTC6957-3/LTC6957-4.

dc1766af

DEMO MANUAL DC1766A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1766A General BOM

1 4 C1, C4, C6, C8 CAP., X7R, 0.01µF 50V 10%, 0603 NIC, NMC0603X7R103K50TRP

2 2 C13, C23 CAP., X7R, 0.1µF 50V 10%, 0603 TDK, C1608X7R1H104K

3 2 C14, C15 CAP., X5R, 1µF 25V 10%, 0603 TDK, C1608X5R1E105K

4 2 C16, C17 CAP., TANT, 22µF 10V, 3528 AVX, TPSB226K010R0400

5 4 E1, E2, E3, E4 TESTPOINT, TURRET 0.094" MILLMAX, 2501-2-00-80-00-00-07-0

6 5 JP1, JP2, JP3, JP4, JP7 JMP, HD1X3-079 SAMTEC, TMM-103-02-L-S

7 4 J1, J2, J3, J4 CONN., SMA 50Ω EDGE-LAUNCH E.F. JOHNSON, 142-0701-851

8 4 R1, R2, R20, R22 RES., CHIP, 100Ω 1% 0603 VISHAY, CRCW0603100RFKEA

9 0 R3, R4, R6, R11, R14 RES., OPT 0603 OPT

10 2 R7, R15 RES., CHIP, 49.9Ω 1% 0603 VISHAY, CRCW060349R9FKEA

11 4 R16, R17, R18, R19 RES., CHIP, 330k 1% 0603 VISHAY, CRCW0603330KFKEA

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

13 5 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G

DC1766A-A

1 1 DC1766A General BOM DC1766A

2 1 U1 IC, LTC6957HMS-3, MS12 LINEAR TECH., LTC6957HMS-3

DC1766A-B

1 1 DC1766A GENERAL BOM DC1766A

2 1 U1 IC, LTC6957HMS-4, MS12 LINEAR TECH., LTC6957HMS-4

dc1766af

DEMO MANUAL DC1766A

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-3

-A

LTC6957HMS-4

-B

3.15V - 3.45V

V+

VDD

GND 2.4V - 3.45V

V+

EXT

IN-PHASE CMOS

COMPLEMENTARY CMOS

V+

VDD

V+VDD

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION3 12-17-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION3 12-17-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MICHEL A.PRODUCTION3 12-17-12

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

12/17/2012, 01:39 PM

LOW PHASE NOISE, DUAL CMOS OUTPUT

KIM T.

MICHEL A.

N/A

LTC6957HMS-3 / -4

DEMO CIRCUIT 1766A

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

12/17/2012, 01:39 PM

LOW PHASE NOISE, DUAL CMOS OUTPUT

KIM T.

MICHEL A.

N/A

LTC6957HMS-3 / -4

DEMO CIRCUIT 1766A

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

12/17/2012, 01:39 PM

LOW PHASE NOISE, DUAL CMOS OUTPUT

KIM T.

MICHEL A.

N/A

LTC6957HMS-3 / -4

DEMO CIRCUIT 1766A

BUFFER/ DRIVER/ LOGIC CONVERTER

R22

100

R22

100

E4E4

JP3

SD1

JP3

SD1

SMA-R

IN+

SMA-R

IN+

C15

1uF

C15

1uF

JP1

FILTA

JP1

FILTA

U1U1

GND

IN-

IN+

V+

FILTA

OUT1 10

OUT2 9

GNDOUT 8

SD2 7

FILTB

VDD 11

SD1 12

SMA-R

OUT2

SMA-R

OUT2

OPT

R20

100

R20

100

0.01uF

OPT

C13

0.1uF

C13

0.1uF C23

0.1uF

C23

0.1uF

C14

1uF

C14

1uF

0.01uF

E3E3

C16

22uF

3528 10V

C16

22uF

3528 10V

R15

49.9

R15

49.9

R14

OPT

R14

OPT

C17

22uF 352810V

C17

22uF 352810V

E2E2

R11

OPT

R11

OPT

R19

330k

R19

330k

49.9

JP7

VDD

JP7

VDD

0.01uF

JP2

FILTB

JP2

FILTB

SMA-R

OUT1

SMA-R

OUT1

R18

330k

R18

330k

R17

330k

R17

330k

OPT

E1E1

100

SMA-R

IN-

SMA-R

IN-

JP4

SD2

JP4

SD2

R16

330k

R16

330k

0.01uF

dc1766af

DEMO MANUAL DC1766A

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

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