CMX138 CML Microcircuits, CMX138 Datasheet - Page 6

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

Audio Scrambler and Sub-Audio Signalling Processor
3
© 2008 CML Microsystems Plc
Reply Data
CMD Data
Clock/Xtal
Serial Clk
Block Diagram
DISC
MIC
VBias
DVdd
VDec
XtalN
DVss
AVdd
AVss
CSN
IRQ
Transmit Functions
Receive Functions
System Control
Bias
Bias
oscillator
Crystal
Interface
C-BUS
VBias
Main clock
PLL
control
Power
Audio processing
Voice
Filter
Compressor
(Optional)
Registers
Sub-audio signalling
In-band signalling
Figure 1 Block Diagram
Voice
Filter
HPF
LPF
Audio Processing
Emphasis
(Optional)
De-Scrambler
Pre-
(Optional)
Sub-audio Signalling
In-band signalling
Pre-programmed 51 tone CTCSS decoder
Pre-programmed 51 tone CTCSS encoder
Programmable 23/24bit DCS decoder
Programmable CTCSS tone decoder
Programmable 23/24bit DCS encoder
Page 6
Programmable CTCSS tone encoder
Programmable In-band encoder
Programmable tone decoder
Scrambler
(Optional)
De-Emphasis
(Optional)
Limiter
Soft
Auxiliary Functions
I/O configuration
Auxiliary DAC
Auxiliary ADC
Auxiliary System Clocks
(Optional)
Expander
Thresholds
Averaging
Channel
Filter
Ramp profile RAM
Programmable PLL Clock
Mux
ADC
sw
sw
I/O
DAC 1
D/138_FI1.0/5
MOD
AUDIO
Tx Enable
Rx Enable
Clock Select
ADC I/P
DAC O/P
Clock O/P
CMX138