DATA BULLETIN
MX806A
Features
Half-Duplex Audio Processor
Dynamic Control of Signal Levels
Performs Signal Conditioning and
Filtering requirements for both
Transmit and Receive
Audio Processor
Three separate signal sections:
Input process
Main Process
Mixing and Output Drives
Low Power Operation
Member of DBS800 Family (C-BUS
Compatible)
MAIN
PROCESS
OUT
MOD
OUT
MOD
IN
CHIP
SELECT
POWER
SUPPLY
SERIAL
CLOCK
COMMAND
DATA
#
PRIMARY
AND
SECONDARY
AUDIO
INPUTS
Voice
Sub-Audio
Tone
MSK,etc.
C-BUS INTERFACE
CALIBRATION INPUT
VOGAD SENSE
ATTENUATOR
MODULATION 1
OUT
#
TX
MIC IN
MIC. AMP
VOGAD AMP
HIGHPASS
FILTER
#
VOGAD
SENSE
#
OR
VOGAD
SENSE
#
TRANSMITTER
MODULATION
DRIVES
#
GAIN
SET
#
#
#
PRE-EMPHASIS
LIMITING
FILTERING
GAIN SETTING
#
ATTENUATOR
MODULATION 2
OUT
INPUT
PROCESS
#
RX
AUDIO IN DE-EMPHASIS
FILTER
MAIN PROCESS
MODULATION
MIXER AMP
OUTPUT DRIVES
#
XTAL/CLOCK
XTAL
CLOCK
GENERATOR
TO EXTERNAL EXTERNAL AUDIO
AUDIO PROCESSES PROCESS IN
BUFFER
ATTENUATOR
LOUDSPEAKER
AUDIO
The MX806A LMR audio processor is intended too primarily to operate as the “Audio Terminal” or radio
systems using the DBS800 Digitally Integrated Baseband Subsystem.
The MX806A half-duplex device has signal paths and level setting elements that are configured and adjusted
by digital information sent from the radio microcontroller using C-BUS protocol. (C-BUS is the serial interface
for all DBS 800 ICs.)
The Signal Path is divided into three sections: Input Process, Main process, and Mixing and Output Drives.
If selected, signal level stability and output accuracy of the MX806A is maintained by a voltage-controlled gain
system using selectable signal-level detectors. Signal levels can be dynamically controlled to provide
“dynamic compensation” for factors such as temperature drift, VCO non-linearity, etc.
The MX806A audio stages can be completely disabled – or the whole IC can be placed into powersave mode,
leaving only clock and C-BUS circuitry active.
The MX806A may be used with a 5.0V power supply and is available in the following packages:
24-pin SOIC (MX806ADW), 24-pin PLCC (MX806ALH), and 24-pin PDIP (MX806AP).
1998
MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480064.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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