DATA BULLETIN MX604 v.23 Compatible Modem PRELIMINARY INFORMATION FEATURES APPLICATIONS 1200bps forward, 75bps back channels Low Power Operation 1mA typ. 3.3V Operating Mode Conforms to relevant sections of v.23 1 A typ. Zero-Power Mode and ETSI specifications Standard 3.58Mhz Xtal/Clock Line Equalization Telephone Telemetry System 1200bps Data Retiming Facility can Applications eliminate external UART Low Voltage Operation (3.3 to 5.0V) Status Control Telephone Line C MX604 Line Interface Data The MX604 is a low voltage, low power CMOS device, used for the reception or transmission of asynchronous 1200bps data and full-duplex 75bps back channel data in accordance with CCITT V.23 and ETSI specifications. This device provides an optional Tx and Rx data retiming function which can eliminate, based on user preference, the need for an external UART when operating at 1200bps. The device can disable the back channel or be operated so only the mark or space tone is produced. The optional line equalizer is incorporated into the receive path and is controlled by an external logic level. The MX604 may be used in a wide range of telephone telemetry systems. Low voltage capability, a low operating current (1mA typ. V = 3.3V), and a very low current sleep mode (1 A typ.) make the MX604 DD ideal for both portable terminal and line powered applications. The MX604 is available in the following packages: 24-pin TSSOP (MX604TN), 16-pin SOIC (MX604DW) and 16-pin PDIP (MX604P). 1998 MX COM, INC. Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. 20480152.004 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.v.23 Compatible Modem 2 MX604 PRELIMINARY INFORMATION CONTENTS Section Page 1. Block Diagram .......................................................................................................... 3 2. Signal List ................................................................................................................. 4 3. External Components .............................................................................................. 5 4. General Description ................................................................................................. 5 4.1 Xtal Osc and Clock Dividers ................................................................................................... 5 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......................................................................................... 7 4.8 Rx Data Retiming ................................................................................................................... 9 4.9 Tx Data Retiming.................................................................................................................. 10 5. Application.............................................................................................................. 11 5.1 Line Interface........................................................................................................................ 11 6. Performance Specification .................................................................................... 12 6.1 Electrical Performance ......................................................................................................... 12 6.2 Timing................................................................................................................................... 15 6.3 Packaging............................................................................................................................. 16 MX COM, Inc. reserves the right to change specifications at any time and without notice 1998 MX COM, INC. Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. 20480152.004 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.