DS50EV401-EVK User Guide
2.5 Gbps / 5.0 Gbps / 8.0 Gbps Quad PCI Express Cable and PC Board Equalizer
Overview
The DS50EV401-EVK evaluation board provides a typical PCIe application for the evaluation of the DS50EV401
2.5 Gbps, 5 Gbps, 8 Gbps x4 Lane Serial PCI Express Equalizer.
Specifications
DC Input Power (JP1): 3.3V ± 10%, or 2.5V ± 5%
Serial Data Inputs (IN_[0:3] +/- ): High-speed CML inputs. Acceptable data input speed DC – 8 Gbps. For more
details, please refer to the datasheet.
Serial Data Outputs (OUT_[0:3] +/- ): High-speed CML outputs. Each output is matched with it’s respective input
channel. For instance, IN_0+ input routes to OUT_0+. For more details, please refer to the datasheet.
CML Input Voltage: -0.5V to 4.0V
CMOS Input Voltage: -0.5V to 4.0V
Jumper Settings
JP5, JP6, JP7, JP8, JP9, JP10, JP11, JP12 (SD[0:3] / EN[0:3] ): Leave these jumpers unconnected.
JP3 (BST1/MODE): The jumper controls equalization frequency levels. Please see Table 1.
Table 1. Equalization Boost Controls
6 mil microstrip FR4
trace length (in)
30
40
24 AWG Twin-AX
cable length (m)
7
10
Frequency
Channel Loss
MODE
8 Gbps
2.5 Gbps
5 Gbps
16 dB
14 dB
20 dB
0 (Default)
1
JP2, JP4 (BST0, BST2): DO NOT USE THESE JUMPERS
JP13, JP14, JP15, JP16 (CS, SDC, SDA, FEB): DO NOT USE THESE JUMPERS
D1, D2: D1/D2 is a LIST-C155KGJRKT LED lamp. The LED serves as the detecting signaling, when shorting pin
1 and 2 of JP5, JP6, JP7, JP8, JP9, JP10, JP11, and JP12. When LED is green/red, the SD is detecting an input
signal, and the data channel is at an active mode.
DS50EV401-EVK User Guide
February 2008
© National Semiconductor Corporation
Bill of Materials
DESIGNATION
C1, C3, C5, C7
C2, C4, C6, C8, C11, C12, C13,
C14, C15, C16, C17, C18, C19,
C20, C21, C22, C23, C24, C25, C26
C9
C10
D1, D2
JP1
JP2, JP3, JP4, JP13,
JP14, JP15, JP16
JP5, JP6, JP7, JP8,
JP9, JP10, JP11, JP12
QTY
4
DESCRIPTION
0.01uF +10% Ceramic Capacitor 0402
20
1
1
2
1
0.1uF +10% Ceramic Capacitor 0402
4.7uF +10% Ceramic Capacitor 0805
22uF +10% Tan Capacitor 7343
LIST-C155KGJRKT LED lamp
1 x 4 Pin Header
7
1 x 3 Pin Header
8
1 x 2 Pin Header
JP2, JP4, JP5, JP6, JP12
JP3
JP7
J1, J2, J3, J4, J5, J6, J7, J8,
J9, J10, J11, J12, J13, J14, J15,
J16,
R1, R2, R3, R4
U1
5
1
1
3 Pin Header
3X2 Pin Header
4X2 Pin header
16
4
1
SMA Edge Tab Receptacle 142-0701-851
220 ohm Resistors
National DS50EV401
DS50EV401-EVK User Guide
February 2008
© National Semiconductor Corporation
Schematics
DS50EV401-EVK User Guide
February 2008
© National Semiconductor Corporation
Top View Layout
DS50EV401-EVK User Guide
February 2008
© National Semiconductor Corporation
Bottom View Layout
DS50EV401-EVK User Guide
February 2008
© National Semiconductor Corporation
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