CML Semiconductor Products Bell 202 Compatible Modem FX614 D/614/4 October 1997 Advance Information 1.0 Features 1200bits/sec 1/2 Duplex Bell 202 compatible Modem with: Optional 5bits/sec and Optional Line Equalisation 150bits/sec Back Channel -40C to +85C Operating Optional 1200bits/sec Data Temperature Retiming Facility 16-pin SOIC and DIL Packages 3.0 to 5.5V Supply 1.0mA at 3V 3.58MHz Xtal/Clock Rate Zero-Power Mode 1A 1.1 Brief Description The FX614 is a low power CMOS integrated circuit for the reception or transmission of asynchronous 1200bits/sec data and is suitable for use in Bell 202 type systems. It is also capable of generating the 5bits/sec or 150bits/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. An optional line equaliser is incorporated into the receive path, this is controlled by an external logic level. The FX614 may be used in a wide range of telephone telemetry systems. With a low operating voltage of 3.0V, a very low current sleep mode (1A) and an operating current of 1mA the device is ideal for portable, terminal and line powered applications. A 3.58MHz standard Xtal/Clock rate is required and the device operates from a 3.0V to 5.5V supply. Both SOIC (D4) and Plastic DIL (P3) 16-pin package types are available. 1997 Consumer Microcircuits LimitedBell 202 Compatible Modem 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 1997 Consumer Microcircuits Limited 2 D/614/4 FX614