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MX429A

1200/2400bps MSK Modem for Trunked Radio Systems

MX-COM Inc  

1200/2400bps MSK Modem for Trunked Radio Systems

3

1 Block Diagram

MX429A

CARRIER DETECT

TIME CONSTANT DATA

RECEIVER INPUT

MSK

RECEIVER

1200/2400 BAUD

MICROPROCESSOR

INTERFACE

STROBE

R/W

RX CARRIER

DETECT

DATA

A1

A0

D7

D6

8-BIT uP BUS

D5

D4

D3

D2

D1

D0

VBIAS

VSS

VDD

CLOCKS

XTAL/CLOCK

XTAL

CLOCK

GENERATORS

1.008 MHz

OUTPUT

SYNC/SYNT

DETECTOR

BYTE

COUNTER

RECOVERED CLOCK

CHECKSUM

CHECKER

RX DATA

REGISTER

RX DATA

BUFFER

8-BIT uP BUS

CONTROL

REGISTER

RX ENABLE

TX ENABLE

RX MESSAGE FORMAT

TX PARITY ENABLE

TX DATA

BUFFER

TX DATA

REGISTER

TIMER

BYTE

COUNTER

RX MESSAGE FORMAT

RX CHECKSUM TRUE

STATUS

REGISTER

SYNC

SYNT

RX DATA READY

RX CARRIER DET.

RX CHECKSUM TRUE

TX DATA READY

TX IDLE

TIMER EXPIRED

CHECKSUM

GENERATOR

TX PARITY

ENABLE

TRANSMITTER

MSK

OUTPUT

TRANSMITTER

RX DATA RDY

TX DATA RDY

SYNC

SYNT

TX IDLE

INTERRUPT IRQ

GENERATOR

Figure 1: Block Diagram

2 Signal List

Pin No.

J/P LH

11

22

34

55

66

77

88

Signal

Name

VBIAS

Transmit Output

Receiver Input

VDD

Carrier Detect

Time Constant:

Xtal/Clock

XTAL

Type

Output

Input

Power

Description

The internal circuitry bias line, held at VDD/2 this pin must be

decoupled to VSS by a capacitor, see Figure 2.

The 1200 baud, 1200Hz/1800Hz and 2400 baud, 1200Hz/2400Hz

MSK Tx output. When not enabled by the Control Register (D0) its

output impedance is set high.

The 1200/2400 baud received MSK signal input. The

1200Hz/1800Hz, 1200Hz/2400Hz audio to this pin must be ac

coupled via a capacitor, see Figure 2.

Positive Supply. A single +5V regulated supply is required. It is

recommended that this power rail be decoupled to VSS by a

capacitor, see Figure 2.

The on-chip Carrier Detect function requires external

component(s) on this pin. See Figure 2for recommended

component(s).

The input to the clock oscillator inverter. A 4.032 MHz Xtal or

externally derived clock pulse input should be connected here,

see Figure 2.

The output of the 4.032 MHz clock oscillator.

© 1998 MX-COM Inc.

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

Doc. # 20480128.007

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

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