March 1991

9

Philips Semiconductors

Preliminary specification

Multistandard colour decoder, with

negative colour difference output signals

TDA4650

Notes to the characteristics

1. For the SECAM standard, amplitude and H/2 ripple content of the CD signals (R

−Y) and (B−Y) depend on the

characteristics of the external tuned circuit at pins 7 to 10. The resonant frequency of the external tuned circuit must

zero by the coil of the tuned circuit.

The external capacitors at the pins 2 and 4 (220 pF each) are matched to the internal resistances of the de-emphasis

network such that every alternate scanned line is blanked.

voltage at pin 17 is less than 0.5 V (burst OFF), thus providing double subcarrier frequencies of the chrominance

signal.

3. The inquiry sequence for the standard is: PAL

− SECAM − NTSC (3.58 MHz) − NTSC (4.43 MHz).

PAL has priority with respect to SECAM, etc.

Super sandcastle pulse detector (note 4)

input voltage pulse levels to

separate V and H blanking pulses

pulse ON

1.3

1.6

1.9

V

pulse OFF

1.1

1.4

1.7

V

voltage pulse amplitude

2.0

2.5

3.0

V

input voltage pulse levels to

separate H blanking pulse

pulse ON

3.3

3.6

3.9

V

pulse OFF

3.1

3.4

3.7

V

voltage pulse amplitude

4.1

4.5

4.9

V

input voltage pulse levels to

separate burst gating pulse

pulse ON

6.2

6.6

7.0

V

pulse OFF

6.0

6.4

6.8

V

voltage pulse amplitude

7.7

−

V

input voltage

during line scan

−−

1.0

V

input current

during line scan

−−−100

µA

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PARAMETER

CONDITIONS

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MAX.

UNIT