CMX138 CML Microcircuits, CMX138 Datasheet - Page 4

• Manufacturer Part Number: CMX138
• Description: Audio Scrambler and Sub-Audio Signalling Processor
• Manufacturer: CML Microcircuits

Audio Scrambler and Sub-Audio Signalling Processor
It is always recommended that you check for the latest product datasheet version from the CML website:
[www.cmlmicro.com].
© 2008 CML Microsystems Plc
Figure
Table 5 In-band Tone.................................................................................................................... 30
Table 6 C-BUS Registers.............................................................................................................. 35
Table 7 Reset Operations ............................................................................................................. 38
Table 8 RAMDAC Values ............................................................................................................. 55
Figure 1 Block Diagram .................................................................................................................. 6
Figure 2 CMX138 Recommended External Components .............................................................. 9
Figure 3 CMX138 Power Supply Connections and De-coupling.................................................. 11
Figure 4 C-BUS Transactions ....................................................................................................... 14
Figure 5 Signal Routing ................................................................................................................ 15
Figure 6 Rx 25kHz Channel Audio Filter Frequency Response................................................... 18
Figure 7 De-emphasis Curve for TIA/EIA-603 Compliance.......................................................... 18
Figure 8 Tx Channel Audio Filter Response and Template (ETSI) .............................................. 20
Figure 9 Tx Channel Audio Filter Response and Template (TIA) ................................................ 20
Figure 10 Audio Frequency Pre-emphasis ................................................................................... 21
Figure 11 Expandor Transient Response ..................................................................................... 22
Figure 12 Compressor Transient Response................................................................................. 23
Figure 13 Low Pass Sub-audio Band Filter for CTCSS and DCS................................................ 26
Figure 14 AuxADC IRQ operation.................................................................................................. 31
Figure 15 Digital Clock Generation Schemes............................................................................... 32
Figure 16 Default Tx Audio Filter line-up ....................................................................................... 58
Figure 17 Default Rx Audio Filter line-up....................................................................................... 58
Figure 18 C-BUS Timing............................................................................................................... 70
Figure 19 Mechanical Outline of 28-pin TSSOP (E1).................................................................... 71
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