LVDSEVAL-001 National Semiconductor, LVDSEVAL-001 Datasheet - Page 3

• Manufacturer Part Number: LVDSEVAL-001
• Description: EVALUATION BOARD FOR DS90LV031A
• Manufacturer: National Semiconductor

Specifications of LVDSEVAL-001

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *LVDSEVAL-001

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The Generic LVDS Evaluation Board is used to measure LVDS signaling performance over different
media. Individual LVDS channels can be evaluated over PCB trace, twisted pair cable, or custom trans-
mission medium. Though LVDS quad drivers and receivers are used on the board, they can represent
the LVDS I/O characteristics of most of National’s LVDS devices.
a) Use the DS90C031/032 to represent the LVDS I/O characteristics of all 5V drivers/receivers,
b) Use the DS90LV031/032 to represent the LVDS I/O characteristics of the DS90LV031/032/017/027
c) Use the upcoming DS90LV031A/032A (available in October 1997) to represent the LVDS I/O
The remainder of this chapter is devoted to explaining the operation of the Generic LVDS Evaluation board.
6.1.0 THE GENERIC LVDS EVALUATION BOARD
6.1.1 Purpose
The purpose of the Low Voltage Differential Signaling (LVDS) Evaluation Printed Circuit Board (PCB) is to
demonstrate the line driving capability of LVDS technology across a short PCB interconnect, and also
across a variable length of twisted pair cable. Probe points for a separate driver and a separate receiver
are also provided for individual line driver or receiver testing. The part number for the Evaluation PCB is
LVDSEVAL-001 (stuffed) or Literature number 550061-001 (unstuffed - limit one per Customer, while sup-
plies last). In this application note and on the PCB the following differential signal nomenclature has
been used: “A” represents the true signal and “B” represents the inverting signal. Driver input signals
are represented with an “I” while receiver outputs are with an “O.”
6.1.2 Five Test Cases
Five different test cases are provided on this simple 4 layer FR-4 PCB. Each case is described separately
next. Note that the driver / receiver numbers do not directly map to the LVDS test channel number (LVDS
Channel 1 utilizes driver number 1 and receiver number 4). The five test cases are shown in figure 1.
5V Channel Link, and 5V FPD-Link devices.
devices.
characteristics of 3V Channel Link, 3V FPD-Link, and other 3V devices not listed in (b) above.
The Generic LVDS Evaluation Board