 |
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
|
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
TDA9143 Datasheet(PDF) 10 Page - NXP Semiconductors |
|
||||||||||||||||||||||||||||||
TDA9143 Datasheet(HTML) 10 Page - NXP Semiconductors |
|
|
10 / 40 page  1996 Jan 17 10 Philips Semiconductors Preliminary specification I2C-bus controlled, alignment-free PAL/NTSC/SECAM decoder/sync processor TDA9143 The divider system operates at twice the horizontal frequency. The line counter receives enable pulses at this frequency, thereby counting two pulses per line. A state diagram of the controller is shown in Fig.5. Because it is symmetrical only the right-hand part will be described. Depending on the previously found vertical frequency, the controller will be in one of the COUNT states. When the line counter has counted 488 pulses (i.e. 244 lines of the video input signal), the controller will move to the next state depending on the output of the norm counter. This can be either NORM, NEAR_NORM or NO_NORM, depending on the position of the vertical sync pulse in the previous fields. When the controller is in the NORM state it generates the vertical sync pulse (VSP) automatically and then, when the line counter is at LC = 626, moves to the WAIT state. In this condition it waits for the next pulse of the double line frequency signal, and then moves to the COUNT state of the current field frequency. When the controller returns to the COUNT state, the line counter will be reset half a line after the start of the vertical sync pulse of the video input signal. The NORM window normally looks within one line width and a sudden half line delay of the vertical sync pulse change can therefore be neglected. Fig.5 State diagram of the vertical divider system. handbook, full pagewidth MGE042 WAIT FOR RESET PULSE NO NORM NORM NORM COUNT COUNT LC = 528 or LC = 576 or on VSP LC = 628 or LC = 722 or on VSP no_norm else no_norm norm norm LC < 488 LC ≤ 525 LC ≤ 625 NEAR NORM NEAR NORM LC < 522 LC < 622 LC < 488 on SYNC if LC < 576 on SYNC if LC ≥ 576 LC = 526 LC = 626 on VSP if 522 < LC < 528 or on LC = 528 on VSP if 622 < LC < 628 or on LC = 628 vertical frequency 60 Hz vertical frequency 50 Hz near_norm near_norm |
Número de pieza similar - TDA9143 |
|
Descripción similar - TDA9143 |
|
|
Enlace URL |
| Política de Privacidad |
| ALLDATASHEET.ES |
| ¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes 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 |
Spanish ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
