Seiko Epson
About usContact

Electronic Devices  |   Semiconductors  |   High-temperature polysilicon TFTs  |   Crystal devices  |   Micro systems     

TOP  >  Circuit Design Information  >   For customers designing with Xilinx, Inc FPGA transceivers

For customers designing with Xilinx, Inc FPGA transceivers

We recommend low jitter SAW oscillator EG-2102CA LVDS output for Virtex series and Spartan-6 transceivers as the most suitable solution.

product name image Operating voltage Output Package size[mm] Feature
EG-2102CA EG2102 3.3 V LVDS 7×5×1.2t Very low jitter and low phase noise by SAW unit.

Recommendable oscillator for Virtex-II Pro X
Recommendable oscillator for Virtex-4
Recommendable oscillator for Virtex-5 (GTP, GTX)
Recommendable oscillator for Virtex-6 (GTX,GTH)
Recommendable oscillator for Spartan-6 GTP
   
For product information of "Virtex series and Spartan-6 ", please see Xilinx's web site.

About design point and notes

Interfacing a SAW oscillator to a Xilinx FPGA transceiver reference clock input
SAW oscillator specifications and Xilinx sFPGA data sheet
Notes for SAW oscillator user
Jitter to affect BER (Bit Error Rate)


 Selection Guidance of SAW Oscillator for XiLinx FPGA Transceivers

Recommendable oscillator for Virtex-II Pro X

We recommend low jitter SAW oscillator EG-2102CA LVDS output Communication Standards, FPGA reference clock frequency and Product Code are as follows.

Communication
standards (Protocol)

Line Rate [Gbps]

Reference clock frequency [MHz]

Product Code

XAUI

3.125

78.125

156.250

312.500

Q3806CA10001700

Q3806CA10004000

Q3806CA10004600

PCI Experss infiniband

2.5

62.500

125.000

250.000

Q3806CA10000700

Q3806CA10003900

Q3806CA10004500

OC-48

2.4883

77.76

155.52

Pleese contact us

Q3806CA10007800

*Product Code: encoded numbers of products' specifications.

*We are pleased to introduce you to our product which frequency tolerance is +/-100x10-6including aging.

back to TOP

Recommendable oscillator for Virtex-4

We recommend low jitter SAW oscillator EG-2102CA LVDS output Communication Standards, FPGA reference clock frequency and Product Code are as follows.

Communication
standards
(Protocol)

Line Rate [Gbps]

Reference clock frequency [MHz]

Product Code

4x Fibre Channel

4.25

212.500

Q3806CA10004400

10G Fibre Channel over 4 links

3.1875

159.375

Q3806CA10004100

XAUI

3.125

312.500

Q3806CA1004600

Serial ATA Type2

3.0

300.000

Q3806CA10011900

Serial ATA Type1

1.5

300.000

Q3806CA10011900

PCI Express

2.5

250.000

Q3806CA10004500

Infiniband

2.5

250.000

Q3806CA10004500

2x Fibre Channel

2.125

212.500

Q3806CA10004400

1x Fibre Channel

1.0625

212.500

Q3806CA10004400

1000BASE-X

1.25

250.000

Q3806CA10004500

OC-12

0.622

155.520

Q3806CA10007800

*Product Code: encoded numbers of products’ specifications

* We are pleased to introduce you to our product which frequency tolerance is +/-100x10-6 including aging.

back to TOP

Recommendable oscillator for Virtex-5 GTP

We recommend low jitter SAW oscillator EG-2102CA LVDS output
Communication Standards, FPGA reference clock frequency and Product Code are as follows.

Communication
standards
(Protocol)

Line Rate [Gbps]

Reference clock frequency [MHz]

Product Code

FC2

2.125

212.500

Q3806CA10004400

FC1

1.0625

106.250

Q3806CA10003800

XAUI

3.125

156.250

Q3806CA10004000

10GBASE-CX4

3.125

156.250

Q3806CA10004000

GigE

1.25

125.000

Q3806CA10103900

SATA Generation 2

3.0

150.000

Q3806CA10010300

SATA Generation 1

1.5

150.000

Q3806CA10010300

PCI Express

2.5

100.000

Q3806CA10001800

Infiniband

2.5

125.000

Q3806CA10003900

HD-SDI

1.485

148.500

Please contact us

3G-SDI

2.970

148.500

Please contact us

OC12

0.62208

155.520

Q3806CA10007800

OC48

2.488

155.520

Q3806CA10007800

SFI-5

3.125

156.250

Q3806CA10004000

2.488

155.520

Q3806CA10007800

SPI-5

2.488

155.520

Q3806CA10007800

TFI-5

3.1104

155.520

Q3806CA10007800

2.488

155.520

Q3806CA10007800

* Product Code: encoded numbers of products’ specifications

* We are pleased to introduce you to our product which frequency tolerance is +/-100x10-6 including aging.

back to TOP

Recommendable oscillator for Virtex-5 GTX

We recommend low jitter SAW oscillator EG-2102CA LVDS output
Communication Standards, FPGA reference clock frequency and Product Code are as follows.

Communication
standards
(Protocol)

Line Rate [Gbps]

Reference clock frequency [MHz]

Product Code

FC4

4.25

212.500

Q3806CA10004400

FC2

2.125

212.500

Q3806CA10004400

FC1

1.0625

106.250

Q3806CA10003800

XAUI

3.125

156.250

Q3806CA10004000

312.500

Q3806CA10004600

10GBASE-CX4

3.125

312.500

Q3806CA10004600

GigE

1.25

125.000

Q3806CA10103900

SATA III

6.0

150.000

Q3806CA10010300

SATA Generation 2

3.0

150.000

Q3806CA10010300

SATA Generation 1

1.5

150.000

Q3806CA10010300

PCI Express, Rev.2

5.0

250.000

Q3806CA10004500

PCI Express,
Rev.1.0a, Rev.1.1

2.5

100.000

Q3806CA10001800

Infiniband

2.5

125.000

Q3806CA10003900

HD-SDI

1.485

148.500

Please contact us

3G-SDI

2.970

148.500

Please contact us

OC48

2.488

155.520

Q3806CA10007800

SFI-5

3.125

195.3125

Please contact us

2.488

155.520

Q3806CA10007800

SPI-5

2.488

155.520

Q3806CA10007800

TFI-5

3.1104

194.4

Please contact us

2.488

155.520

Q3806CA10007800

* Product Code: encoded numbers of products’ specifications

* We are pleased to introduce you to our product which frequency tolerance is +/-100x10-6 including aging.

back to TOP

 

Recommendable oscillator for Virtex-6 GTX

We recommend low jitter SAW oscillator EG-2102CA LVDS output
Communication Standards, FPGA reference clock frequency and Product Code are as follows.

Communication
standards
(Protocol)

Line Rate [Gbps]

Reference clock frequency [MHz]

Product Code

Fibre Channel
(Single Rate)

4.25

212.500

Q3806CA10004400

2.125

106.250

Q3806CA10003800

1.0625

106.250

Q3806CA10003800

Fibre Channel
(Multi-Rate)

4.25

212.500

Q3806CA10004400

2.125

212.500

Q3806CA10004400

1.0625

212.500

Q3806CA10004400

XAUI

3.125

156.250

Q3806CA10004000

GigE

1.25

125.000

Q3806CA10003900

SATA

3.0

150.000

Q3806CA10010300

1.5

150.000

Q3806CA10010300

PCIe
Optimal Jitter

5.0

250.000

Q3806CA10004500

2.5

125.000

Q3806CA10003900

PCIe
100MHz REFCLK

5.0

100.000

Q3806CA10001800

2.5

100.000

Q3806CA10001800

3G-SDI / HD-SDI
(Multi-Rate)

2.97

148.500

Please contact us

1.485

148.500

Please contact us

Interlaken

6.25

312.500

Q3806CA10004600

4.25

212.500

Q3806CA10104400

3.125

156.250

Q3806CA10004000

SFI-5

3.125

195.3125

Please contact us

OC-48

2.488

155.520

Q3806CA10007800

OC-12

0.62208

155.520

Q3806CA10007800

OTU-1

2.666057

166.6286

Please contact us

* Product Code: encoded numbers of products’ specifications

* We are pleased to introduce you to our product which frequency tolerance is +/-100x10-6 including aging.

back to TOP

Recommendable oscillator for Virtex-6 GTH

We recommend low jitter SAW oscillator EG-2102CA LVDS output

Communication Standards, FPGA reference clock frequency and Product Code are as follows.

Communication
standards
(Protocol)

Line Rate [Gbps]

Reference clock frequency [MHz]

Product Code

10GBASE-R

10.3125

156.250

Q3806CA10004000

CEI11

11.1

173.370

Please contact us

OC-192

9.953

155.520

Q3806CA10007800

OC-48

2.488

155.520

Q3806CA10007800

OTU-1

2.667

167.330

Please contact us

OTU-2

10.71

167.330

Please contact us

OTU-3

10.75

168.050

Please contact us

OTU-4

11.18

174.690

Please contact us

XFP

9.953

155.520

Q3806CA10007800

XLAUI

10.3125

156.250

Q3806CA10004000

CAUI

10.3125

156.250

Q3806CA10004000

* Product Code: encoded numbers of products’ specifications

* We are pleased to introduce you to our product which frequency tolerance is +/-100x10-6 including aging.

back to TOP

Recommendable oscillator for Spartan-6 GTP

We recommend low jitter SAW oscillator EG-2102CA LVDS output

Communication Standards, FPGA reference clock frequency and Product Code are as follows.

Communication
standards
(Protocol)

Line Rate [Gbps]

Reference clock frequency [MHz]

Product Code

XAUI

3.125

156.250

Q3806CA10004000

GigE

1.25

125.000

Q3806CA10003900

SATA

3.0

150.000

Q3806CA10010300

1.5

150.000

Q3806CA10010300

PCIe

100MHz REFCLK

2.5

100.000

Q3806CA10001800

PCIe

Additional Margin

2.5

125.000

Q3806CA10003900

Display Port

2.7

135.000

Please contact us

1.62

162.000

Please contact us

GPON1

2.488

155.520

Q3806CA10007800

OTU-1

1.244

155.520

Q3806CA10007800

* Product Code: encoded numbers of products’ specifications

* We are pleased to introduce you to our product which frequency tolerance is +/-100x10-6 including aging.

back to TOP


Interfacing a SAW oscillator to a FPGA transceiver reference clock input

 Design point

 Example of board layout design

Please note the following design point when you connect our SAW oscillator and Xilinx FPGA.
[1] Provide AC coupling between the oscillator output pins and the dedicated clock input pins.

<Effect>

DC current is blocked between the oscillator and the FPGA clock input pins.
Power consumption of both parts is reduced.
The AC coupling capacitor forms a high-pass filter with the on-chip termination that attenuates a wander of the reference clock.

[2] Provide a dedicated point-to-point connection between the oscillator and clock input pins.

[3]Keep impedance discontinuities on the differential transmission lines to a minimum.
   Design the two output lines by differential impedance 100 ohm.

<Effect>


[4] Keep two transmission lines to same length and width.

<Effect>

    Common-mode noise is absorbed and rejected, when the phase difference between two signals is kept 180 degrees.
Design point
back to TOP

Example of board layout design (2 layers, 2nd layer is all GND pattern)

 Board layout

*Please design transmission lines to connect FPGA to SAW oscillator and board thickness to GND so that differential impedance becomes 100 ohm.

 

calculus

*As for the Virtex FPGA reference clock input, LVDS terminal resistance is unnecessary outside so that terminal resistance is built in it.

*Please refer to ”Notes for SAW oscillator user“

Terms of UsePrivacyPolicy AboutEpsonOtherEpsonProducts

Copyright (c) Seiko Epson Corporation All rights reserved.