DS91M040EVK/NOPB National Semiconductor, DS91M040EVK/NOPB Datasheet - Page 7

• 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

DS91M040 Evaluation in a Point-to-Point Link
The following is a recommended procedure for building an evaluation M-LVDS point-point network with
DS91M040 evaluation boards. Figure 5 depicts a typical setup and instrumentation used for evaluation of a
point-to-point link.
April 14, 2008
Rev. 1.0
1. Use a single DS91M040 evaluation board.
2. Apply the power to the board (3.3 V typical) between J5 and J6 banana plug receptacles, observe the
3. Configure U1 as a driver. This is accomplished by setting DE and RE* pins to VDD (J1). Connect a
4. Configure U2 as a receiver. This is accomplished by setting DE and RE* pins to GND (J3).
5. Select a differential interconnect with balanced 100-ohm differential impedance (i.e. UTP cable) and
6. Terminate the interconnect with a matching resistor on the inputs of the U2 receiver (R2).
7. Observe waveforms by either connecting the receiver LVCMOS output pin (J2, pin 29) directly to an
value of I
are functional.
signal source to the driver inputs (J2, pin 3).
connect the M-LVDS pins of both devices through SMA connectors (SMA1 and SMA2 for U1 driver
outputs; SMA3 and SMA4 for U2 receiver inputs ;). You may want to consider developing / obtaining an
SMA to RJ45 adapter board for easy interface from SMA connectors to twisted pair cables. See the
following link: http://www.national.com/appinfo/lvds/sma2rj45evk.html.
oscilloscope or by probing receiver M-LVDS input pins with a differential probe.
Figure 5 - M-LVDS Point-to-Point Link with DS91M040 Boards and UTP Cable
CC,
and compare it with the expected value (refer to the datasheet) to ensure that the devices
© 2008, National Semiconductor Corp.
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