Motore di ricerca datesheet componenti elettronici |
|
TS7514 Scheda tecnica(PDF) 6 Page - STMicroelectronics |
|
TS7514 Scheda tecnica(HTML) 6 Page - STMicroelectronics |
6 / 19 page OPERATING MODES The various operating modes are defined by MC/BC and MOD/DTMF inputs, and by the content of a control register RPROG. The TS7514 includes 8 control registers. Access to each control register is achieved through an auxil- liary 8-bit shift register (input register). The input of that shift register is connected either to TxD or PRD, depending upon the statusof the ENP control pin (ie when ENP = 0 and ENP = 1 respectively). In both cases, the RTS input receivesthe shift clock and sequentialy transfer is controlled by setting simultaneously MOD/DTMF and MC/BC to 0. The previous internal status and data are memorized during loading of the input register so that transmis- sion continues properly. That feature allows the user to modify transmission level or line monitoring selection during transmission. The transmit chan- nel operatingmode (Modem main or back channel, DTMF) can only be modified when RTS = 1. When RTS = 0, the ATO transmit output is enabled and the preselected operating mode is activated. When RTS returns to 1, Modem or DTMF transmission is inhibited after the first zero crossing of the gener- ated signal. MOD/DTMF MC/BC Transmission (ATO) Reception (RxD, DCD) 1 1 MODEM, Main Channel MODEM, Back Channel 1 0 MODEM, Back Channel MODEM, Main Channel 0 1 DTMF DCD= Active Tone Detection (270 -500Hz) if RTS = 1 … DCD = 1 if RTS = 0 0 0 If RTS = 0 when that configuration occurs, transmission and reception are not modified. If RTS = 1 (no signal sent on the line), transmission is not modified and reception is set up to detect 2100Hz tone (note 1). Note 1 : The decision threshold of the demodulator output is shifted, so that RxD changes from 0 to 1 at 1950Hz instead of 1700Hz. MODEM TRANSMISSION FREQUENCIES Modulation Rate TxD CCITT R35 AND V.23 Recommendations (Hz) Frequency Generated with Xtal at 3.579MHz (Hz) Error (Hz) 75bps 1 0 390 ±2 450 ±2 390.09 450.45 +0.09 +0.45 1200bps 1 0 1300 ±10 2100 ±10 1299.76 2099.12 -0.24 -0.88 DTMF TRANSMISSION FREQUENCIES Specifications DTMF (Hz) Frequency Generated with Xtal at 3.579MHz (Hz) Dividing Ratio Error (%) f1 f2 f3 f4 f5 f6 f7 f8 697 ±1.8% 770 ±1.8% 852 ±1.8% 941 ±1.8% 1209 ±1.8% 1336 ±1.8% 1477 ±1.8% 1633 ±1.8% 699.13 771.45 853.90 940.01 1209.31 1335.65 1479.15 1627.07 5120 4640 4192 3808 2960 2680 2420 2200 +0.31 +0.19 +0.22 -0.10 +0.03 -0.03 +0.15 +0.36 TS7514 6/19 |
Codice articolo simile - TS7514 |
|
Descrizione simile - TS7514 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEETIT.COM |
Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |