Texas Instruments 125 MHz Quad M-LVDS Transceiver Evaluation Board DS91M040EVK/NOPB DS91M040EVK/NOPB 데이터 시트

 

        

April 14, 2008 

 

 

Rev. 1.0 

                     © 2008, National Semiconductor Corp.  

 

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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. 

 
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 

value of I

CC, 

and compare it with the expected value (refer to the datasheet) to ensure that the devices 

are functional. 

 
3.  Configure U1 as a driver.  This is accomplished by setting DE and RE* pins to VDD (J1).  Connect a 

signal source to the driver inputs (J2, pin 3). 

 
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 

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:  

. 

 
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 

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