universal lvds ribbon cable marc defossez 12 th december 2005

12
Universal LVDS ribbon cable Marc Defossez 12 th December 2005

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Page 1: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Universal LVDS ribbon cable

Marc Defossez12th December 2005

Page 2: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Presentation Name 2

QSE

/ Q

TE –

028-

01-L

-D-D

P-A

CLK / Sync / IO CLK / Sync / IO

CLK / Sync / IO CLK / Sync / IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

IO

Generic Schematic Symbol

PCB mounted Q

SE part

Page 3: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Presentation Name 3

Schematic Symbol

• This represents a ground connection.• These pins are physically not available on a

differential pair QSE / QTE Samtec connector.• They are available when using the standard type

QSE or QTE connectors.• Represented with the ground connections is the

middle-connector ground plane.

Page 4: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Presentation Name 4

XLVDS Schematic Symbol

QSE

/ Q

TE –

028-

01-L

-D-D

P-A

-

CLK Sync

13

11

9

7

5

15

1

nc

nc

nc

nc

3

0

nc

nc

nc

nc

2

12

10

8

6

4

14

nc nc

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

Tranmitter PCB side.

Due to the symmetry of the cable, both connectors can not be placed the same way. The receiver side of the connector can be found on next page.

PCB mounted Q

SE part

Page 5: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Presentation Name 5

XLVDS Schematic Symbol

QSE / Q

TE –028-01-L-D-D

P-A-

Receiver PCB side.

Due to the symmetry of the cable, both connectors can not be placed the same way. The transmitter side of the connector can be found on previous page.

CLK

13

11

9

7

5

15

1

nc

nc

nc

nc

3

nc

NP

NP

NP

NP

NP

NP

NP

NP

NP

Sync

0

nc

nc

nc

nc

2

12

10

8

6

4

14

nc

NP

NP

NP

NP

NP

NP

NP

NP

NP

PCB mounted Q

SE part

Page 6: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Presentation Name 6

XVamPire Schematic Symbol

QSE

/ Q

TE 0

28-0

1-L-

D-D

P-A

-

CLK Sync

23

21

19

17

15

25

11

13

10

12

22

20

18

16

14

24

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

0

2NP

NP

8

6

4

NP

NP

NP

1

3 NP

NP

9

7

5

NP

NP

NP

Tranmitter PCB side.

On the XVamPire Board there are 64 LVDS channels. This connector shows only part of them.

The differential IO are spread over two banks (2*TX and 2*RX). When taking two fully occupied connectors, a third one can be used to share the remaining signals or two not completely occupied connectors can be used only populated with the remaining pins of the bank.

25:0Clk, sync

Clk, sync63:38

37:26

Page 7: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Presentation Name 7

XVamPire Schematic Symbol

Receiver PCB side.

On the XVamPire Board there are 64 LVDS channels. This connector shows only part of them.

The differential IO are spread over two banks (2*TX and 2*RX). When taking two fully occupied connectors, a third one can be used to share the remaining signals or two not completely occupied connectors can be used only populated with the remaining pins of the bank.

25:0Clk, sync

Clk, sync63:39

37:26

QSE / Q

TE –028-01-L-D-D

P-A-

CLK

23

21

19

17

15

25

11

9

7

5

3

13

1

NP

NP

NP

NP

NP

NP

NP

NP

NP

Sync

10

8

6

4

2

12

22

20

18

16

14

24

0

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NP

NPNP

NP

NP

NP

NP

NP

NP

Page 8: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Presentation Name 8

PCB Layout QSE-028-xx part

01

5.740.19

2.87

2.27

0.80

0.41

2.79

6.35

4.70

5.02

0.43

20.0

0

20.0

0

16.1

3

Num

ber o

f ban

ks x

20.

00 +

0.1

3

0.46

2.46

1.02DIA

Cou

rtes

y of

SA

MT

EC

Page 9: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Presentation Name 9

If termination resistorsneed to be placed closeto the connector, this can be the lay-out otherwise these pads can be used as test points for differential probes.

If termination resistorsneed to be placed closeto the connector, this can be the lay-out.

Ground connection ofthe middle-connectorground shield.

Ground connection ofthe middle-connectorground shield.

A ground shield has been placed on the PCB layer under the connector.

The differential connector does not have the ground connections between the signal pins !We decided to design them in to get optimal signal shielding (creation of a guard ring).

PCB Layout QSE-040-xx or QSE-028-xx part

Page 10: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Presentation Name 10

Connector detailsSingle v Differential

Two different style connectors are available from SAMTEC for the QSE/QTE series, that can share the same PCB layout, shown earlier.

QSE-028-01-x-D-DP-A is a Differential Pair connector and QSE-040-01-x-D-A – a Single ended connector.

The differential pair connector has a pin pair arrangement. surrounded by gaps/or un-populated pins in the body. One out of three pins is missing.

The single ended version of the connector can be seen as universal connector since all pins are populated. The connector can thus be used in single ended and differential pair applications.

Page 11: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Presentation Name 11

Cable details

Cables are available from Samtec.The order numbers - please see page on cable specification.

50 Ohm Single ended EQCD-040-11.81-TEU-TEU-4100 Ohm Differential EQDP-028-11.81-TEU-TEU-4

The connectors are SAMTEC QSE and QTE.Specifications are available at:http://www.samtec.comhttp://www.samtec.com/suddenspecs/techspec.asp?series=QSE

Technical specifications can be found at:http://www.samtec.com/suddenspecs/techspec_test.asp?series=QSE

Page 12: Universal LVDS ribbon cable Marc Defossez 12 th December 2005

Presentation Name 12

Cable Specification READ THIS!

Customers should be aware that cables can be specified as wired straight through or twisted, additionally - connector mechanical polarization must be considered .

In terms of Cable wiring connections, because a PCB is used to mount connectors at the cable ends there are 16 different combinations that a cable wiring can be specified.

The Samtec web site provides circuit diagrams of Cables which can be used to confirm the suitability of any particular cable for an application.