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MX828 Datasheet

  • MX828

  • CTCSS/DCS/SelCall Processor

  • 34頁

  • CMLMICRO

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DATA BULLETIN
MX828
Features
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Fast CTCSS Detection
Full Duplex CTCSS and SelCall
Full 23/24 Bit DCS Codec
SelCall Codec
Non Predictive Tone Detection
Low Power 3.3V/5.0V Operation
Variable Gain Audio Filter
Programmable:
Tone Decoder
Tone Encoder
Modulator Drivers
Comparator for RSSI
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Pin compatible with reduced function MX818
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Full control via 4-Wire Serial Interface
CTCSS/DCS/SelCall
Processor
PRELIMINARY INFORMATION
Applications
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Radio Systems Requiring Sub-Audible
Signaling
Trunking Control
Selective Calling
Group Calling
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Increased Efficiency
Scanning Systems
Trunking Systems
CTCSS
RADIO
Tx MOD1
FAST CTCSS
SELCALL
DCS
CARRIER DETECT
MODULATOR
RF
DISCRIMINATOR
Tx MOD2
RSSI
ANALOG Rx
TIMER
LEVEL CONTROL
AUDIO
MSK
DTMF
LEVEL & VOLUME
CONTROLS
(OPTIONAL)
AUDIO
SIGNALS
AUDIO FILTER
MX828
KEYBOARD
HOST
碌
C
SERIAL C-BUS:
DATA & CONTROL
DISPLAY
MX829
The MX828 is a low power SelCall, CTCSS, and DCS signal processor designed for use in the latest generation of LMR
(Land Mobile Radio) equipment where sub-audible signaling is required for functions such as Trunking Control, Selective
Calling, and Group Calling applications. The MX828 is full duplex and offers many advanced features to assist in the
design of new Sub-Audible and in-band based systems. These include: a programmable tone decoder which may be set
to respond to between 1 and 15 CTCSS or SelCall tones with minimum software intervention, a Fast/Predictive CTCSS
detector that can respond to a single programmed tone in less than 60ms or provide an output if CTCSS tone is present at
the detector input, two high resolution tone encoders that accurately generate CTCSS or SelCall tones, and a full 23/24 bit
DCS encoder and decoder. The MX828 also provides a general purpose timer, a comparator with a programmable
threshold, and a summing amplifier with two adjustable gain blocks to facilitate design integration and reduce part count.
The MX828 may be used with a 3.0 to 5.5 volt supply and is available in the following packages: 24-pin SSOP
(MX828DS), 24-pin SOIC (MX828DW), and 24-pin PDIP (MX828P).
漏 1997 MX鈥OM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480161.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.

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