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TS7514 Datasheet Programmable V.23 Modem

Manufacturer: STMicroelectronics

Overview: TS7514 PROGRAMMABLE V.23 MODEM WITH DTMF . . . . . . . . . . PROGRAMMABLE MODES : - Modem 75bps transmit, 1200bps receive - Modem 1200bps transmit, 75bps receive - DTMF dialing - Call status tone detection - Auxiliary analog transmit input - Analog test loopback PROGRAMMABLE FUNCTIONS : - Transmission level - Hysteresis and detection level - Filters (reception and transmission) - Line monitoring and buzzer - DTMF frequencies FIXED PROMISE LINE EQUALIZER AUTOMATIC BIAS ADJUSTMENT INTEGRATED DUPLEXER STANDARD LOW COST CRYSTAL (3.579MHz) TAX TONE REJECTION POWER-UP INITIALIZATION OF REGISTERS OPERATES FROM ±5V CMOS DIP24 (Plastic Package) PLCC28 (Plastic Leaded Chip Carrier Package) on a 4-wire line. Its programming concept makes it the ideal ponent to design low-cost intelligent modems, featuring auto dialing and auto answering. The TS7514 conforms to CCITT V.23 remendation. The chip incorporates DTMF dialing, line monitoring, tone and dialing detection.

General Description

The TS7514 is an FSK modem which can be programmed for asynchronous half-duplex voiceband munications on a 2-wireline or full duplex PIN CONNECTIONS DIP24 MOD/DTMF MC/BC RTS ENP DGND TxD PRD XTAL IN XTAL OUT DCD RxD ZCO 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 AXTL DIP24 PLCC28 PLCC28 MOD/DTMF MC/BC ATXL WLO ATO RTS WLO ATO N/C 28 27 V+ ENP 5 6 7 8 9 10 11 12 13 14 15 16 17 18 25 24 23 22 21 20 19 V+ AGND VRAO1 RAI1 RAI2 N/C 7514-01.EPS / 7514-02.EPS AGND VRAO1 RAI1 RAI2 RAO2 RFO DGND TxD PRD N/C XTAL IN XTAL OUT N/C ZCO RDI DCD RFO RxD RDI RAO2 26 4 3 2 1 November 1998 1/19 7514-01.TBL Part Number Temperature Range Package TS7514 PIN DESCRIPTION Name MOD/DMTF Pin Number DIP24 1 PLCC28 1 MODEM or DMTF Operating Mode Selection.

Also controls write operations to control registers (if MOD/DMTF = 0 and MC/BC = 0).

Digital Control Input.

Key Features

  • DTMF dialing, call status tone detection and line monitoring in both dialing and automaticanswer modes. A signalling frequency is available at the line monitoring output (buzzer). Ring detection is possible by using the signal detection function and bypassing the receive filter. The receive signal at ZCO output can be filtered in the associated microprocessor. The.

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TS7514 Distributor