 |
Datenblatt-Suchmaschine für elektronische Bauteile |
|
|
Datenblatt-Suchmaschine für elektronische Bauteile |
|
TDA8505 Datenblatt(PDF) 6 Page - NXP Semiconductors |
|
||||||||||||||||||||||||||||||
TDA8505 Datenblatt(HTML) 6 Page - NXP Semiconductors |
|
|
6 / 32 page  July 1994 6 Philips Semiconductors Preliminary specification SECAM encoder TDA8505 FUNCTIONAL DESCRIPTION The following three important circuits are integrated: • Encoder circuit • Modulator control circuit • Sync separator and pulse shaper. Encoder circuit INPUT STAGE R, G and B inputs are connected to the matrix via a clamping and a blanking circuit. For an EBU colour bar of 75% the amplitude of the signal must be 0.7 V (peak-to-peak value). The outputs of the matrix are Y, D'R and D'B. The second part of the input stage contains inputs for colour difference signals and a luminance signal. The condition for 75% colour bar is −(R−Y) = 1.05 V (peak-to-peak value) at pin 1, −(B−Y) = 1.33 V (peak-to-peak value) at pin 3 and Y = 1 V (peak-to-peak value) without sync at pin 5. After clamping and blanking the amplitude and polarity are corrected such that the signals are equal to the signals of the matrix output. Signals are connected to a switch. Fast switching between the two input parts is possible by the multiplexer control pin (pin 2). The Y output signal of the multiplexer is added to the sync pulse of the sync separator. The Y input (pin 5) is different to the other 5 inputs. The timing of the internal clamping is after the sync period and there is no vertical blanking. The input blanking of Y can be switched off by a HIGH at pin 12, and the internal sync separator signal is not added to the Y signal. In this way the Y+SYNC is allowed at pin 5 and after clamping internally connected directly to pin 25. The colour difference signals are switched sequentially by H/2 and fed to the low frequency pre-emphasis circuit. The colour-killing input signal at pin 28 can be used for completely blanking the internal colour difference signals at the input of the low frequency pre-emphasis filter. LOW FREQUENCY PRE-EMPHASIS This filter is fully integrated, Fig.3 illustrates the nominal response. The transfer is guaranteed within the illustrated area for the whole ambient temperature range by a compensation circuit. Fig.3 Nominal response for the low frequency pre-emphasis filter. handbook, full pagewidth 10 MLA953 - 1 10 6 10 5 10 4 0 8 6 4 2 2 4 f (Hz) H (dB) 10 7 |
Ähnliche Teilenummer - TDA8505 |
|
Ähnliche Beschreibung - TDA8505 |
|
|
Link URL |
| Privatsphäre und Datenschutz |
| ALLDATASHEETDE.COM |
| War ALLDATASHEET hilfreich? [ DONATE ] |
Über Alldatasheet | Werbung | Kontakt | Privatsphäre und Datenschutz | Linktausch | Hersteller 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 |
German ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
