Texas Instruments SD395EVK - Evaluation Board SD395EVK/NOPB SD395EVK/NOPB 데이터 시트

JP2, JP3, and JP4 are used to control the  CD

¯¯¯  and Mute, Bypass, and Auto Sleep functions while the device is 

configured in Pin Mode.  Do not place jumpers on JP2, JP3, or JP4 while the device is configured for SPI 
Mode. 

JP2 allows Carrier Detect ( CD

¯¯¯ ) monitoring and MUTE control.   CD

¯¯¯ is high when no input signal is present.  MUTE 

may be used to force the outputs on or off, or tied to  CD

¯¯¯  to allow automatic mute operation if the SDI signal is not 

present. To activate mute and force the outputs into a muted condition, set the jumper to pull MUTE to VCC.  To 
turn off mute so that the outputs will never mute, set the jumper to tie MUTE to GND.  For normal operation, set the 
jumper to tie  CD

¯¯¯  to MUTE for automatic mute control.  The MUTE pin has an internal pulldown (to disable mute), 

so JP2 may be left unconnected and the device will never mute. 

JP3 allows control of the equalization BYPASS function.  To put the device into bypass mode, set the jumper to pull 
BYPASS to VCC.  To turn off bypass (for normal operation) set the jumper to pull BYPASS to GND.  The BYPASS 
pin has an internal pulldown (to disable bypass), so JP2 may be left unconnected for normal operation. 

JP4 allows control of the AUTO SLEEP function.  To put the device into auto sleep mode in which it will power 
down when no input is detected, set the jumper to pull AUTO SLEEP to VCC.  To turn off auto sleep and prevent 
the LMH0395 from automatically powering down, set the jumper to pull AUTO SLEEP to GND.  The AUTO SLEEP 
pin has an internal pullup (to enable auto sleep), so JP4 may be left unconnected to enable auto sleep mode. 
 

JP1 is the SPI (Serial Peripheral Interface) header.  It allows access to the SPI pins ( SS

¯¯¯ , MISO, MOSI, and SCK) 

while the LMH0395 is in SPI mode.  These pins may be connected to a standard SPI controller to access the 
LMH0395 SPI registers.  Refer to the LMH0395 datasheet for details. 
 

D1 shows the status of Carrier Detect.  This LED is GREEN when an input signal has been detected, and OFF 
when no input is detected.  D1 shows the status of Carrier Detect while in Pin Mode or SPI Mode. 

SD395 EVK User Guide 

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Rev 1.0 

                             © 2010, National Semiconductor Corp.