 SU.HARDW.HSMODEM (2:5020/299)  SU.HARDW.HSMODEM 
 From : Kesha Pan                           2:5020/68.11    Mon 27 Feb 95 00:32 
 Subj : Re: ZyXEL                                                               


     BURR-BROWN

   > PCM56P  Surial Input 16-Bit Monolithic Digital-To-Analog Converter


        -Vs    1Ŀ16    +Vs
 -5V <Ĵ              Ŀ  > +5V
              2 Ŀ          15          1uF
   1uF    Ĵ  16-Bit  \16-Bit Trimm(1) 
           DAC Latchÿ/ Iout   14
     Log Comm  3 ^   DAC   MSB Adjust(1)
 +5V <Ĵ/_   _\            13 Iout
   1uF   +Vl Ŀ      Ŀ
            416-Bit Ser.ٳ 12   
           NC Ĵto Par.Conv       Ŀ Analog
                ^^       ٳ11 SJ  Common
                Ŀ 
               5Control            10 RF
           CLC ĴLogic and   ĿĿ
            LE ĴLev.Shif-  o- OP  9  
          Data Ĵing Curc.  Ĵ+AMPo Analog Output
 -5V <Ĵ    Vout (+-3.0V)
         -Vl  8
   1uF 
       

                             TRIM 15oĿ
      Zero adjusting                     470k
        curcuit.                        
                                         100k
                             MSB  14o> 
                            Adjust      
                                         200k
                                        
                            -Vs     o


   뢮  p, 6  7 -  .
    - Logic common,  - Analog common.

   1   -Vs        Analog Negative Supply
   2   LOG COM    Logic Common
   3   +Vl        Logic Positeve Supply
   4   NC         No Connection
   5   CLC        Clock Input
   6   LE         Latch Enable Input
   7   DATA       Serial Data Input
   8   -Vl        Logic Negative Supply
   9   Vout       Voltage Output
  10   RF         Feedback Resistor
  11   SJ         Summing Junction
  12   ANA COM    Analog Common
  13   Iout       Current Output
  14   MSB ADJ    MSB Adjustment Terminal
  15   TRIM       MSB Trim-pot Terminal
  16   +Vs        Analog Positeve Supply

    BURR-BROWN Data Book. ᥣ 8 p.

--- Fido Dido
 * Origin:   y   WHO... (2:5020/68.11)



