MX614 COMMUNICATION SEMICONDUCTORS DATA BULLETIN Bell 202 Compatible Modem PRELIMINARY INFORMATION Features Applications 1200bps - 1800bps half duplex Bell 202 Low Voltage Operation (3.3V to 5.0V) Compatible Modem Low Power Operation Optional 1200bps Data Retiming Facility 1mA typ. 3.3V Operating Mode can eliminate external UART 1 A typ. Zero-Power Mode Optional 5bps and 150bps Back Channel Standard 3.58MHz Xtal/Clock Optional Line Equalization Telephone Telemetry Applications Status Control Telephone Line C MX614 Line Interface Data The MX614 is a low voltage, low power CMOS integrated circuit designed for the reception or transmission of asynchronous 1200bps data. This device is compatible with Bell 202 type systems. The MX614 supports 5bps and 150bps back channel operation. Asynchronous data rates up to 1818bps are also supported. The MX614 provides an optional Tx and Rx data retiming function which can eliminate, based on user preference, the need for a UART in the associated C when operating at 1200bps. An optional line equalizer has been incorporated into the receive path and is controlled by an external logic level. The MX614 may be used in a wide range of telephone telemetry systems. A very low current Zero Power Mode (1 A typ.) and an operating current of 1mA typ. V = 3.3V, make the MX614 ideal for portable, DD terminal and line powered applications. A standard 3.58MHz Xtal/Clock is required and the device operates from a 3.0V to 5.5V supply. The MX614 is available in 24-pin TSSOP (MX614TN), 16-pin SOIC (MX614DW) and 16-pin PDIP (MX614P) packages. 2000 MX-COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. 20480162.004 4800 Bethania Station Road, Winston-Salem, NC 27105 USA All Trademarks and Service Marks are held by their respective companies.Bell 202 Compatible Modem 2 MX614 PRELIMINARY INFORMATION CONTENTS Section Page 1. Block Diagram................................................................................................................. 3 2. Signal List........................................................................................................................ 4 3. External Components..................................................................................................... 5 4. General Description........................................................................................................ 6 4.1 Xtal Osc and Clock Dividers....................................................................................................6 4.2 Mode Control Logic.................................................................................................................6 4.3 Rx Input Amplifier....................................................................................................................6 4.4 Receive Filter and Equalizer ...................................................................................................6 4.5 Energy Detector ......................................................................................................................7 4.6 FSK Demodulator....................................................................................................................7 4.7 FSK Modulator and Transmit Filter .........................................................................................8 4.8 Rx Data Retiming....................................................................................................................9 4.9 Tx Data Retiming ..................................................................................................................10 5. Application Notes.......................................................................................................... 12 5.1 Line Interface ........................................................................................................................12 6. Performance Specification........................................................................................... 13 6.1 Electrical Performance..........................................................................................................13 6.2 Packaging .............................................................................................................................16 MXCOM, Inc. reserves the right to change specifications at any time and without notice. 2000 MX-COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. 20480162.004 4800 Bethania Station Road, Winston-Salem, NC 27105 USA All Trademarks and Service Marks are held by their respective companies.