June 1993

10

Philips Semiconductors

Preliminary specification

Generic multi-standard decoder

TDA4655

Notes to the characteristics

1. Burstkey width for PAL 4.3

µs, for NTSC 3.6 µs.

Burst width for PAL and NTSC 2.25

µs, ratio burst chrominance amplitude 1/2.2.

2. At nominal phase of hue control.

3. V (p-p) of signal divided by 6 times effective noise voltage.

4. At NTSC 3.58 35 mV (p-p).

5. H/2 blanking alternately every second line.

6. These pins are leakage current sensitive. Pin 4 for (B-Y) Channel, pin 10 for (R-Y) Channel.

7. Within 2 dB output voltage deviation.

8. This pin is leakage current sensitive.

9. IC only.

10. Depends also on network on pin 17.

11. Pin 23 for PAL, pin 22 for SECAM, pin 21 for NTSC 3.58 MHz, pin 20 for NTSC 4.43 MHz.

Threshold levels are dependent on supply.

12. The field interval of the sandcastle has to be adapted to the ICs TDA2579B and TDA4690.

The thresholds are independent of supply voltage.

13. System scanning sequence: PAL, SECAM, NTSC 3.5, NTSC 4.4.

System control processing (note 13)

system hold delay

in event of a signal

disappearing for a

short time

2

−

3

field

periods

colour killer; colour ON delay

switching occurs

during field blanking

2

−

3

field

periods

colour OFF delay

0

−

1

field

periods

scanning time for each system

−

4

−

field

periods

QUALITY SPECIFICATION URV-4-2-59/601

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PARAMETER

CONDITIONS

MIN.

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