DATA BULLETIN

© 1998 MX

•COM Inc.

www.mxcom.com Tele: 800 638-5577 336 744-5050

Fax: 336 744-5054

Doc. # 20480160.004

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

All trademarks and service marks are held by their respective companies.

PRELIMINARY INFORMATION

Features

Applications

• Rx Audio Processing

• Tx Audio Processing

• 1200/2400 Baud Modem

• DTMF Encoder

• Low Voltage Operation

• “C-BUS” Compatible

• Host µC Interface

• ETS/MPT/PAA Standards Compatible

• LMR/PAMR/PMR Trunked Systems

• Multi-standard Modem Formats

MX829

MSK MODEM

AUDIO PROCESSOR

DTMF ENCODER

LEVEL & VOLUME

CONTROLS

HOST µC

SERIAL BUS:

ANALOG Rx

Tx MOD 1

Tx MOD 2

RF

DISCRIMINATOR

MODULATOR

RADIO

DATA & CONTROL

The MX829 is a low voltage CMOS integrated circuit, designed to provide baseband audio and system signal-processing

functions required for LMR/PAMR/PMR trunked radio applications. The MX829 operates in half-duplex mode under the

serial-bus control of a host µC.

The MX829 incorporates a dual-rate 1200/2400bps MSK modem, with a software-flexible choice of synchronization

codewords, data run-length and CRC checking to suit a wide range of applications. These features allow very flexible

handling of user defined data on traffic channels in addition to the network signaling sent on control channels. A 16

character DTMF encoder is available in the transmit mode. Software programmable output level-adjustment facilitates

two-point modulation circuits.

The audio processing stages include transmit and receive filtering (based on standards specified for 12.5kHz and 25kHz

LMR/PAMR/PMR channel operation), transmit deviation limiting, and a programmable Rx volume control. Power saving is

automatic when audio functions are disabled.

The MX829 is designed for use in radios compatible with MPT1327, PAA1382 and ETS 300 086 Trunking Standards.

The features and flexibility of the MX829 ensure that it is equally suitable for use with modified or proprietary standards.

The MX829 is available in the following packages: 24-pin SSOP (MX829DS), 24-pin SOIC (MX829DW), and

24-pin PDIP (MX829P).