CML Semiconductor Products
PRODUCT INFORMATION
FX529
Features
PAA 1382 and General Purpose
Trunked Radio Applications
Meets ETSI I-ETS 300 230 Binary
Signalling Specification
Full-Duplex 1200 Baud Operation
High Intelligence
Error Checking in Receive
CARRIER DETECT
TIME CONSTANT
RECEIVER INPUT
DATA
FFSK Modem for
Trunked Radio Systems
Product Summary
Frame SYNC/SYNT Detection
Preamble Generation
µProcessor Compatible Interface
Carrier Detection On-Chip
General Purpose Timer
Error Check Word Generation
Rx MESSAGE FORMAT
FFSK
RECEIVER
SYNC/SYNT
DETECTOR
BYTE
COUNTER
CHECKSUM
COUNTER
Rx CHECKSUM TRUE
STATUS
REGISTER
SYNC
SYNT
Rx DATA READY
Rx CARRIER DETECT
Rx CHECKSUM TRUE
Tx DATA READY
Tx IDLE
TIMER EXPIRED
Tx PARITY
ENABLE
MICROPROCESSOR
INTERFACE
STROBE
R/W
A
1
A
0
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
RECOVERED CLOCK
HI
LO
Rx CARRIER
DETECT
DATA
Rx DATA
REGISTER
Rx DATA
BUFFER
8-bit µP BUS
Tx DATA
BUFFER
CONTROL
REGISTER
CHECKSUM
GENERATOR
Tx DATA
REGISTER
FFSK
TRANSMITTER
BYTE
COUNTER
Rx DATA RDY
Tx DATA RDY
SYNC
SYNT
Tx IDLE
FX529
1200/2400 Baud
V
DD
V
BIAS
CLOCKS
Rx ENABLE
Tx ENABLE
Rx MESSAGE FORMAT
Tx PARITY ENABLE
TRANSMITTER
OUTPUT
XTAL/CLOCK
CLOCK
GENERATORS
XTAL
V
SS
TIMER
INTERRUPT IRQ
GENERATOR
1.008 MHz
OUTPUT
Brief Description
The FX529 is a single-chip CMOS 1200 baud FFSK
Modem, designed primarily for use in trunked radio
systems but may also be employed in other general
purpose radio or line data communication applications.
This device conforms to both the PAA 1382 French
trunked radio, and the proposed ETSI
I-ETS 300 230 “Binary Interchange of Information and
Signalling” specifications.
The FX529 is full duplex at 1200 baud and includes
an 8-bit parallel microprocessor interface and a
programmable timer which may be set for interrupt
periods of between 8 and 120 bits.
Preamble data and an error-check word are
automatically generated in the transmit mode.
Error checking is performed and the 16-bit SYNC
(“1011010000110011”) or SYNT
(“0100101111001100”) word detected in the receive
mode.
An on-chip Xtal/clock generator requiring an
external 4.032MHz Xtal or clock input provides all
microcircuit filter sampling clocks and modem timings
whilst also supplying a “Clock “ 4” output (1.008MHz).
Pin and function compatible with the FX429, the
FX429 data sheet should be consulted when using this
device
The FX529, which has a powersaving facility,
requires a single 5-volt power supply and is available
in both cerdip DIL and plastic SMD packages.
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