Universal LVDS ribbon cable
Marc Defossez12th 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
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.
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
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
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
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
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
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
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.
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
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.