AX.25 Modem
CMX7031/CMX7041
8.3
Packaging...................................................................................................... 48
Table
Page
Table 1 Definition of Power Supply and Reference Voltages............................................. 9
Table 2 BOOTEN Pin States............................................................................................ 18
Table 3 DTMF Tone Pairs................................................................................................ 22
Table 4 TxSequencer Timing........................................................................................... 23
Table 5 Data Frequencies for 1200bps............................................................................ 27
Table 6 Averaging Values ................................................................................................ 28
Table 7 GPIO States........................................................................................................ 33
Table 8 C-BUS Registers................................................................................................. 35
Figure
Page
Figure 1 Block Diagram...................................................................................................... 6
Figure 2 CMX7031 Recommended External Components.............................................. 10
Figure 3 CMX7041 Recommended External Components.............................................. 11
Figure 4 CMX7031 Power Supply Connections and De-coupling.................................... 13
Figure 5 CMX7041 Power Supply Connections and De-coupling.................................... 14
Figure 6 C-BUS Transactions .......................................................................................... 17
Figure 7 FI Loading from Host ......................................................................................... 19
Figure 8 FI Loading from Serial Memory.......................................................................... 20
Figure 9 Ramp-up and Ramp-down Sequences.............................................................. 24
Figure 10 Tx Operation .................................................................................................... 25
Figure 11 Rx Operation.................................................................................................... 26
Figure 12 Modulating Waveform for 1200bps AFSK Signals........................................... 27
Figure 13 Modulating Waveform for 9600bps GMSK Signals ......................................... 27
Figure 14 9600bps Data Scrambler ................................................................................. 27
Figure 15 AuxADC IRQ Operation................................................................................... 28
Figure 16 Example RF Synthesiser Components for a 512MHz Receiver ...................... 29
Figure 17 Single RF Channel Block Diagram .................................................................. 30
Figure 18 Digital Clock Generation Schemes .................................................................. 32
Figure 19 Level Adjustments............................................................................................ 34
Figure 20 C-BUS Timing.................................................................................................. 47
Figure 21 Mechanical Outline of 64-pin VQFN (Q1) ........................................................ 48
Figure 22 Mechanical Outline of 64-pin LQFP (L9).......................................................... 48
Figure 23 Mechanical Outline of 48-pin VQFN (Q3) ........................................................ 49
Figure 24 Mechanical Outline of 48-pin LQFP (L4).......................................................... 49
It is always recommended that you check for the latest product datasheet version from the
Datasheets page of the CML website: [www.cmlmicro.com].
2013 CML Microsystems Plc
Page 4
D/7031/7041_FI-4.x/5
CMLMICRO [ CML MICROCIRCUITS ]
