FX429LG

The FX429LG belongs to FX429 family, which 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. The device has been designed to conform to the UK Band IH trunked radio protocols MPT 1317/1327. The FX429 family is lull duplex at 1200 baud and includes an 8-bit parallel microprocessor interface and a programmable timer which may be set for interrupt periods of 8 to 120 bits. Preamble and an error-check word are automatically generated in the transmit mode. Error checking is performed and the 16-bit SYNC or SYNT words are detected in the receive mode. An on-chip Xtal/clock generator requiring an external 4.032M Hz Xtal or clock input provides all microcircuit filter sampling clocks and modem timin i whilst also supplying a "Clock + 4" output (1 .008MHz). The FX429 family, which has a powersaving facility, requires a single 5-volt power supply and is available in both cerdip DIL and plastic SMD packages.

The features of FX429 can be summarized as (1)band and general purpose turnked radio applications; (2)frame SYNC and SYNT delection; (3)preamble generation; (4)full-dnuplex 1200 baud operation; (5)processor compatible interface; (6)high intelligence(error checking in receive); (7)carrler detection on-chip; (8)low power consumption ; (9)error check ward generation; (10)general purpose timer.

Exceeding the maximum rating of FX429 family can result in device damage. Operation of the device outside the operating limits is not implied. The absolute maximum ratings of FX429 are (1)supply voltage:-0.3 to 7.0V ; (2)input voltage at any pin (ref VSS = 0V): -0.3 to (VDD +0.3V) ; (3)sink/source current: (supply pins),+/-30mA; (other pins), +/-20mA ; (4)total device dissipation @ TAMB 25°C.800mW Max; (5)derating: 10mW/°C; (6)operating temperature range: -30°C to +70°C (plastic) ; (7)storage temperature range: -40°C to +85°C (plastic).