PDF FX469 Data sheet ( Hoja de datos )

Número de pieza	FX469
Descripción	1200/2400/4800 Baud FFSK Modem
Fabricantes	CML
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No Preview Available ! CML Semiconductor Products PRODUCT INFORMATION FX469 1200/2400/4800 Baud FFSK Modem Features Selectable Data Rates 1200, 2400 and 4800 Baud Full-Duplex FFSK Rx and Tx Bandpass Filters Clock Recovery and Carrier Detect Facilities Rx and Tx Enable Functions Publication D/469/6 April 1998 Pin Selected Xtal/Clock Inputs 1.008MHz or 4.032MHz Radio and General Applications Data-Over-Radio PMR and Cellular Signalling Portable Data Terminals Personal/Cordless Telephone Tx DATA I/P Tx ENABLE Tx GENERATOR Tx FILTER CLOCK RATE XTAL/CLOCK XTAL CLOCK OSCILLATOR 1200/2400 BAUD SELECT 4800 BAUD SELECT Rx ENABLE Rx SIGNAL I/P Rx FILTER DIVIDER f .. n LIMITER RETRIGGERABLE MONOSTABLE DIGITAL FILTER DATA FILTER Tx SIGNAL O/P Tx SYNC O/P VDD V BIAS VSS LIMITER BANDPASS O/P UNCLOCKED DATA O/P RECTIFIER NOISE FILTER RECTIFIER Fig.1 Functional Block Diagram DIGITAL PLL DATA LATCH CLOCKED DATA O/P Rx SYNC O/P S/N COMPARATOR CARRIER DETECT TIME CONSTANT CARRIER DETECT O/P FX469 Brief Description The FX469 is a single-chip CMOS LSI circuit which operates as a full-duplex pin-selectable 1200, 2400 or 4800 baud FFSK Modem. The mark and space frequencies are 1200/1800, 1200/2400 and 2400/4800 Hz respectively. Tone frequencies are phase continuous; transitions occur at the zero crossing point. Employing a common Xtal oscillator with a choice of two clock frequencies (1.008MHz or 4.032MHz) to provide baud-rate, transmit frequencies, and Rx and Tx synchronization, the transmitter and receiver operate entirely independently including individual section powersave functions. The FX469 includes on chip circuitry for Carrier Detect and Rx Clock recovery, both of which are made available as output pins. Rx, Tx and Carrier Detect paths each contain a bandpass filter to ensure the provision of optimum signal conditions both in the modem and for the Tx modulation circuitry. The FX469 demonstrates a high sensitivity and good bit-error-rate under adverse signal conditions; 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. This low-power device requires few external components and is available in small outline plastic (S.O.I.C) and cerdip DIL packages. 1 1 page Application Information ...... Tx ENABLE tESET Tx SYNC Tx DATA DC = Don’t Care DV = Data Valid t DSET DC DV t DH DC t TxD 1200 BAUD Tx OUTPUT OPEN CIRCUIT t TDR t TDR DV DC DV DC 2400 BAUD Tx OUTPUT OPEN CIRCUIT OPEN CIRCUIT OPEN CIRCUIT Fig.4 Transmitter Timing Characteristics Note Tx Delay, Signal to Disable Time Data Set-Up Time Data Hold Time Tx Delay to O/P Time Tx Data Rate Period Rx Data Rate Period Undetermined State t ESET tDSET t DH tTxD tTDR tRDR Internal Rx Delay tID 1. Consider the Xtal/Clock tolerance. 2. All Tx timings are related to the Tx Sync Output. 3. 1200 baud example. 3 1 3 3 Min. 2.0 2.0 2.0 - - 800 - - Typ. - - - 1.2 833 - - 1.5 Max. 800 - - - - 865 2.0 - Unit µs µs µs µs µs µs µs ms Rx SIGNAL I/P 2400/4800 BAUD LOGIC ’1’ LOGIC ’0’ Rx SIGNAL I/P 1200 BAUD 1 Rx SYNC O/P (1200Hz) 0 1 CLOCKED DATA O/P 0 t ID t RDR Fig.5 Rx Timing Diagram 5 Undetermined State LOGIC ’1’ LOGIC ’0’ 5 Page

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