FX604D4

CML Semiconductor Products V23 Compatible Modem FX604 D/604/3 November 1996 Provisional Information 1.0 Features 1200/75 bits/sec Full Duplex V23 compatible Modem with: Optional 75bits/sec Back Channel Optional Line Equalisation Optional 1200bits/sec Data -40C to +85C Operating Retiming Facility Temperature 3.58MHz Xtal/Clock Rate 16-pin SOIC and DIP Packages 3.0 to 5.5V Supply 1.0mA typ. at 3V Conforms to relevant sections of Zero-Power Mode 1A typ. V23 and ETSI specifications 1.1 Brief Description The FX604 is a low power CMOS integrated circuit for the reception or transmission of asynchronous 1200bits/sec data in accordance with CCITT V.23 and ETSI specifications. It is also capable of generating the 75bits/sec back channel . The device incorporates an optional Tx and Rx data retiming function that removes the need for a UART in the associated C when operating at 1200bits/sec. The device can disable the back channel or be operated so only the mark or space tone is produced. An optional line equaliser is incorporated into the receive path, this is controlled by an external logic level. The FX604 may be used in a wide range of telephone telemetry systems. With a low voltage requirement of 3.0V it is suitable for both portable terminal and line powered applications. A very low current sleep mode (1 A typ.) and operating current of 1mA typ. mean the device is ideal for line powered applications. A 3.58MHz standard Xtal/Clock rate is required and the device operates from a 3.0 to 5.5V supply. Both SOIC (D4) and Plastic DIL (P3) 16-pin package types are available. 1996 Consumer Microcircuits LimitedV.23 Compatible Modem FX604 CONTENTS Section Page 1.0 Features......................................................................................................1 1.1 Brief Description ........................................................................................1 1.2 Block Diagram............................................................................................3 1.3 Signal List ..................................................................................................3 1.4 External Components ................................................................................5 1.5 General Description ...................................................................................5 1.5.1 Xtal Osc and Clock Dividers .........................................................5 1.5.2 Mode Control Logic.......................................................................6 1.5.3 Rx Input Amplifier .........................................................................6 1.5.4 Receive Filter and Equaliser .........................................................6 1.5.5 Energy Detector ...........................................................................7 1.5.6 FSK Demodulator.........................................................................7 1.5.7 FSK Modulator and Transmit Filter ...............................................7 1.5.8 Rx Data Retiming .........................................................................9 1.5.9 Tx Data Retiming........................................................................10 1.6 Application Notes ....................................................................................12 1.6.1 Line Interface..............................................................................12 1.7 Performance Specification ......................................................................13 1.7.1 Electrical Performance................................................................13 1.7.2 Packaging ..................................................................................16 1996 Consumer Microcircuits Limited 2 D/604/3