MOTOROLA MICRO TAC INTERNATIONAL 7500 GSM CHIPLIST RF/LOGIC BOARD BACK
=========================================================================
 1) BGY203M             Philips		GSM receiver / transmitter 
 2) 32D08		Motorola	RF TX power controller
 3) PC79939D or X1101	Motorola	Frequency converter
 4) XC94Ann		Motorola	IF AMP
 5) X82G01 or XC32D05	Motorola	GUSS IC or hi-frq mixed "8200"type
 6) XC390nnnFU 		Motorola	GMSK modulator/demodulator (Modem IC)
 X) X-tal 13Mhz
 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
X                               X
X                         +--+  X
X +------+                |  |  X
X |     1|                +--+  X
X |  G   |              .....   X
X |  S   |      +--+            X
X |  M   |      | 2| .          X
X |      |      |  | .          X
X |  T   |      +--+ .     +--+.X
X |  X   |           .     |  |.X
X |  /   |           .     +--+.X
X |  R   |                     .X
X |  X   |           .         .X
X |      |           .          X
X |      |           .          X
X |      |           .         .X
X |      |           .         .X
X |      |           .+-------+.X
X +------+            |       |.X 
X                     +-------+.X
X .................            .X
X .        ..     .             X
X .        ..     .    ......   X
X ...........     .             X
X           .     .             X
X   +--+    .     .             X
X   | 3|    .......            .X
X   |  |       ....   +---+    .X
X   +--+       .  .   |  4|    .X
X              .  .   +---+    .X
X              ....    ......   X
X     +---+                     X
X     |  5|         +---------+ X
X     +---+       . |        6| X
X                 . |         | X
X                 . | Modem IC| X
X            +-+  . |         | X
X            |X|    +---------+ X
X            +-+                X
X                               X
X HW 6.0 SUF1989F MOTOROLA 7500 X 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

The Modem IC  xc390221FU takes care of GMSK modulation/de-modulation, encryption/decryption, A/D, D/A and 
TX clock control. Here is how it is interfaced :

                                     ________
                                    | X94A11 |
                             -------| IF-AMP |-------
                             ||     |________|      |
          Receive I.Q signal ||          ^ ^        |
                             ||          | |        |
                             ||          | |        |
                             \/     clock| | data   |
                           __________    | |        |500Khz
             CPU DATA     |          |   | |        |
           <------------->| XC39022FU|---o |        | 
                          | Modem IC |---|-o        | 
           -------------->|__________|   | |        | 
             CPU COMMAND       | |       | |        |
                               | |       | |        | 
                               | |       | |        |
     TXAmpCtrl IC 32D08 <------- |      \/ \/       |
                                 |   ____________   |
             Transmit I.Q signal |  |            |  |
                                 -->|  XG82G01   |<--
                                    |  GUSS IC   |
                                    |____________|

                                          |
                       88MHz GMSK signal  |
                                          |
                                         \/
                                       _______
                                      |       |
                       Frq converter  |pc79939|     
                                      |_______|
>                                         |
                                       ___|___   
                                      |  ___  |
                                      | /     |
                                      |_______|
                                          |
                                       ___|___  
                                      |       |
                                      |   ~   |
                                      |_______|
                                          |
                                       ___|___ 
                                      |  ___  |
                                      | /   \ |
                                      |_______|

                                          |
                                          PA

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