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DATA BULLETIN

MX469

Features



Selectable Data Rates

1200/2400/4800bps



Full-Duplex MSK



RX and TX Bandpass Filters



Clock Recovery and

Carrier Detect Capabilities



Pin Selected Xtal/Clock Inputs

1.008MHz or 4.032MHz

TX GENERATOR

TX DATA I/P

TX ENABLE

CLOCK RATE

TX FILTER

1200/2400/4800bps MSK Modem

Applications











Radio and General Applications

Data-Over-Radio

PMR/Cellular Signaling

Portable Data Terminals

Personal/Cordless Telephone

TX SIGNAL O/P

TX SYNC O/P

V

DD

XTAL/CLOCK

CLOCK

OSCILLATOR

XTAL

1200/2400 BPS SELECT

4800 BPS SELECT

BANDPASS O/P

RX ENABLE

RX FILTER

LIMITER

RETRIGGERABLE

MONOSTABLE

DIGITAL

FILTER

DATA

FILTER

LIMITER

UNCLOCKED

DATA O/P

DIVIDER

f

..

V

BIAS

n

V

SS

RX SIGNAL I/P

RECTIFIER

DIGITAL

PLL

DATA

LATCH

CLOCKED

DATA O/P

RX SYNC O/P

NOISE FILTER

RECTIFIER

S/N

COMPARATOR

CARRIER DETECT TIME CONSTANT

CARRIER DETECT O/P

The MX469 is a full-duplex pin-selectable 1200/2400/4800bps Minimum Shift Key (MSK) Modem for FM radio

links. The mark and space frequencies are 1200/1800, 1200/2400, and 2400/4800Hz respectively. Tone

frequencies are phase continuous; transitions occur at the zero crossing point. The use of a common Xtal

oscillator with a choice of two clock frequencies (1.008MHz or 4.032MHz) provides data-rate, transmit

frequencies, and RX/TX synchronization. The transmitter and receiver operate entirely independently

including individual section powersave functions.

The MX469 includes on-chip circuitry for Carrier Detect and RX Clock Recovery, both of which are made

available at output pins. RX, TX, and Carrier Detect circuits contain bandpass filters to provide high quality

signals in their respective paths. The carrier detect time constant is set by an external capacitor, whose value

should be arranged as required to further enhance this product's performance in high-noise environments.

The MX469 demonstrates high sensitivity and good bit-error-rate under adverse signal conditions.

This low-power device requires few external components and is available in the following packages:

24-pin SOIC (MX469DW), 22-pin PDIP (MX469P), and 20-pin SOIC (MX469D3).

1998

MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480081.010

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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