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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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TS7514CP Datenblatt(PDF) 4 Page - STMicroelectronics |
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TS7514CP Datenblatt(HTML) 4 Page - STMicroelectronics |
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4 / 19 page  FUNCTIONAL DESCRIPTION The TS7514 circuit is an FSK modem for half-du- plex, voice-band asynchronoustransmissions on a 2-wire line according to CCITT recommendation V.23 or full duplex on 4 wire-line. The circuit 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 de- tection function and bypassing the receive filter. The receive signal at ZCO output can be filtered in the associated microprocessor. The TRANSMIT channel (Tx) includes : - Two programmable frequency generators. - One switched capacitor filter (SCF) with low-pass or bandpass configuration and its associated propagation delay corrector. - One continuous time low-pass smoothing filter. - One attenuator, programmable from 0 to + 13dB by 1dB steps. - One programmable analog input. The RECEIVE channel (Rx) includes : - Two operational amplifiers for duplexer imple- mentation. - One continuous time low-pass anti-aliasing filter. - One programmable gain amplifier. - One linear compromise equalizer. - One switched capacitor band pass filter (can be set to either main or back channel). - One continuous time low pass smoothing filter. - One limiting amplifier. - One correlation demodulator. - One programmable level signal detector. The LINE MONITORING channel includes : - One buzzer. - One 3-channel multiplexer to select beetwen : - Transmit channel monitoring. - Receive channel monitoring. - Buzzer. - One programmable attenuator Internal Control Power-up Initialization The TS7514includes power-up initialization of con- trol registers. This system sets the ATO transmis- sion output to an infinite attenuation position, leaving time for the microprocessor to set up the RPROG input on power up. Control registers are also initialized when V+ is lower than 3V or V- greater than -3V. Registers Writeaccess to the DTMF data registerand to other control registers is achieved in serial mode through TxD input or PRD input. Addressing of these 4 bit registers is indirect. They are accessed through an 8 bit shift register addressed when MOD/DTMF = 0 and MC/BC = 0. Data sent to the TxD input is strobed on the RTS signal trailing edge. Serial data is sent to the TxD input, with Least Significant Bit (LSB) first. The 4 Most Significant Bits (MSB) contain the control register address while the 4 LSB contain associated data. Data transfer from the input register to the control register (addressed by the MSB’s) is started by the operating mode (MODEM or DTMF) selection (MOD/DTMF = 1 or MC/BC = 1). D0 D1 D2 D3 D4 D5 D6 D7 MOD/DTMF MC/BC RTS TxD or PRD Data Address Time RPROG RDTMF RATTE RWLO RPTF RHDL RPRX RPROG TxD or PRD RTS CLK Datas Addresses 8-BIT SHIFT REGISTER (Input Register) 4-Bit Control Register Figure 2 : Internal Control Register TS7514 4/19 |
Ähnliche Teilenummer - TS7514CP |
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Ähnliche Beschreibung - TS7514CP |
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