Digital PMR Radio Processor
CMX7131/CMX7141
Table 7 NXDN Frame Format – Data Burst Operation ................................................................. 27
Table 8 Frame Types.................................................................................................................... 29
Table 9 Xtal/Clock Frequency Settings for Program Block 3........................................................ 30
Table 10 BOOTEN Pin States....................................................................................................... 32
Table 11 NXDN Standard Vocoder Connections.......................................................................... 36
Table 12 Modem Mode Selection ................................................................................................. 39
Table 13 Modem Control Selection............................................................................................... 39
Table 14 C-BUS Data Registers ................................................................................................... 48
Table 15 RxData 0/TxData 0 Block ID settings............................................................................. 49
Table 16 C-BUS Registers............................................................................................................ 61
Figure
Page
Figure 1 CMX7141 Block Diagram.................................................................................................. 7
Figure 2 CMX7141 Recommended External Components........................................................... 11
Figure 3 CMX7131 Recommended External Components........................................................... 12
Figure 4 CMX7141 Power Supply and Decoupling....................................................................... 14
Figure 5 CMX7131 Power Supply and Decoupling....................................................................... 15
Figure 6 CMX994 Interface........................................................................................................... 16
Figure 7 NXDN Vocoder Connection ............................................................................................ 20
Figure 8 RSSI in I/Q Mode ............................................................................................................ 22
Figure 9 4-FSK PRBS Waveform – Modulation............................................................................ 23
Figure 10 4-FSK PRBS Waveform – Spectrum............................................................................ 23
Figure 11 Modulation Characteristics............................................................................................ 24
Figure 12 Internal Data Blocks (LD Mode).................................................................................... 25
Figure 13 Additional Internal Data Processing in I/Q Mode .......................................................... 25
Figure 14 FS Detection ................................................................................................................. 28
Figure 15 C-BUS Transactions ..................................................................................................... 31
Figure 16 FI Loading from Host .................................................................................................... 34
Figure 17 FI Loading from Serial Memory..................................................................................... 35
Figure 18 I2S Mode Support.......................................................................................................... 36
Figure 19 Tx Data Flow................................................................................................................. 43
Figure 20 Automatic Tx Sequencer............................................................................................... 44
Figure 21 Frequency Response for Rx Pass-through Mode......................................................... 45
Figure 22 Rx Data Flow................................................................................................................. 52
Figure 23 AuxADC IRQ Operation................................................................................................ 54
Figure 24 Example RF Synthesiser Components......................................................................... 55
Figure 25 Single RF Synthesiser Block Diagram .......................................................................... 56
Figure 26 Digital Clock Generation Schemes ............................................................................... 58
Figure 27 Tx Modulation Spectra - 4800bps................................................................................. 60
Figure 28 C-BUS Timing............................................................................................................... 71
Figure 29 Mechanical Outline of 64-pin VQFN (Q1) ..................................................................... 72
Figure 30 Mechanical Outline of 64-pin LQFP (L9)....................................................................... 72
Figure 31 Mechanical Outline of 48-pin VQFN (Q3) ..................................................................... 73
Figure 32 Mechanical Outline of 48-pin LQFP (L4)....................................................................... 73
Information in this datasheet should not be relied upon for final product design. It is always recommended
that you check for the latest product datasheet version from the CML website: [www.cmlmicro.com].
2014 CML Microsystems Plc
Page 5
D/7141_FI-3.x/6
CMLMICRO [ CML MICROCIRCUITS ]
