c727c8f7   
   From: dpierce@cartchunk.org   
      
   Mahen K wrote:   
   > Hi,   
   >   
   > Digital Audio receiver ICs like DIR9001 and CS8414 mention the diff   
   > voltage level at their input pins RXP and RXN as 200mv min while the   
   > Digital Audio Transsmitters like DIT4096 and CS8406 use  5V logic   
   > levels. How are they compatible with wide difference in levels? I am   
   > looking at using them for SPDIF transmission and reception.   
      
    From IEC 958 5.3.3.3 "Minimum input signals",   
      
       Minimum input voltage shall be 0.2V peak-to-peak   
      
   That is, the MINIMUM input voltage.   
      
   Now, if you actually read the specs for, oh, the DIT4096,   
   you might discover that even though the "core voltage" is   
   5 volts, a figure more relevant to your issues is the   
   "high-level output voltage Voh" which is listed at 0.8V   
      
   Further inspection of the spec sheet reveals, in figure   
   11, a block referred to as the "output circuit," which   
   is elucidated in figures 12, 13 and 14. FIgure 13 is,   
   again, most relevant to your question. It shows the   
   output circuit for a SP/DIF circuit, consisting,   
   significantly of a 2:1 step-down pulse transformer,   
   which would make it completely compatible with the   
   IEC 958 standard.   
      
   Aren't spec sheets wonderful?   
      
      
      
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