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CMX624P4

Bell 202 and V.23 Modem with Call Progress and DTMF; ? Bell 202 and V.23 Compatible Modem\n? 1200bps Full duplex Operation (2 or 4 Wire)\n? Software Adjustable Tx and Rx Levels\n? Programmable Group Delay Equalizer\n? Answer/Originate Tone Generator/Detector\n? Call Progress Tone Detection\n? Integrated DTMF Encoder\n? Line Reversal and Ring Detector\n? Simple Serial Control Interface\n? Hook Switch Relay Driver\n? Zero-Power Standby Mode\n? 3.0 to 5.0V OperationApplications\n? Telephone Telemetry Systems\n? Remote Utility Meter Reading\n? Security Systems\n? Payphones\n? Cable-TV Set Top Boxes\n? Industrial Control Systems\n? Electronic Cash Terminals\n? Vending Machines?;

General Description\nThe CMX624 contains a Bell 202 and V.23 compatible FSK modem. This device is capable of duplex operation at 1200/75bps or 1200/150bps over a 2-wire line interface. It is also capable of 1200/1200bps over a 4-wire line interface. This device also contains a flexible FSK data UART, a receive FSK or Call Progress Tone energy detector, a 2100Hz detector, a DTMF generator, a Tx line driving buffer amplifier, a telephone line Ringing Signal or Line Voltage Reversal detector and a 3.579545MHz Xtal oscillator. These functions are controlled via a serial interface to the μC, which also carries the transmit and receive FSK modem data.

CMX624P4

V.23 / Bell 202 Modem; ? V.23 / Bell 202 Compatible Modem\n? Integrated DTMF Encoder\n? Call Progress Tone Detection\n? Line Reversal and Ring Detector\n? Low Power Operation (2.7V)\n? Part of the CMX6x4 Modem SeriesApplications\n? Telephone Telemetry Systems\n? Remote Utility Meter Reading\n? Security Systems/Cash Terminals\n? Industrial Control Systems\n? Pay-Phones\n? Cable TV Set-Top Boxes?;

Brief Description\nThe CMX624 V.23 / Bell 202 modem is intended for use in any telephone based information and telemetry system with low power requirements. Using FSK signalling, fast call set-up times and robust error resistant transmission can be implemented by efficient low power circuits. The circuit can operate at 1200bps full duplex over a 4-wire circuit or 1200 bps plus low speed data over a 2-wire circuit. Flexible line driver and receive hybrid circuitry are integrated on chip requiring only passive external components to build a 2- or 4-wire interface. A low impedance pull down output is provided for a hook relay.

CMX624P4

V.23 / Bell 202 Modem

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TSSOP16