DS91M040EVK/NOPB National Semiconductor, DS91M040EVK/NOPB Datasheet - Page 5

• Manufacturer Part Number: DS91M040EVK/NOPB
• Description: BOARD EVALUATION DS91M040
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of DS91M040EVK/NOPB

• Main Purpose: Interface, M-LVDS, Transceiver
• Utilized Ic / Part: DS91M040
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Other names: DS91M040EVK

The block diagram of Figure 2 details a clock distribution network in an ATCA backplane. The clock busses
have 130-ohm differential impedance and are doubly terminated with 80 ohms at either end of the backplane.
The parallel combination of 80-ohm resistors means that the MLVDS devices will be driving a 40-ohm load
termination. The maximum stub length from the backplane is defined in the ATCA standard as 1 inch or 2.54
cm.
Figure 3 shows a picture of a 14-slot ATCA backplane fully populated with DS91M040 evaluation boards.
Figure 3 - DS91M040 Evaluation Boards in an ATCA Backplane
April 14, 2008
5
Rev. 1.0
© 2008, National Semiconductor Corp.