November 1984

8

Philips Semiconductors

Product specification

Multistandard decoder

TDA4555

TDA4556

Notes

1. Value measured without influence of external circuitry.

3. Or not connected.

4. The signal amplitude of the colour difference signals (R-Y) and (B-Y) is dependent on the characteristics of the

external tuned circuits at pins 7, 8 and 4, 5 respectively. Adjustment of the amplitude is achieved by varying the

Q-factor of these tuned circuits. The resonant frequency must be adjusted such that the demodulated output

5. The sandcastle pulse is compared with three internal threshold levels, which are proportional to the supply voltage.

Sandcastle pulse detector (see note 5)

Input voltage pulse levels (pin 24)

to separate vertical and horizontal blanking pulses

1,2

−

2,0

V

required pulse amplitude

2,0

−

3,0

V

to separate horizontal blanking pulse

3,2

−

4,0

V

required pulse amplitude

4,0

−

5,0

V

to separate burst gating pulse

6,5

−

7,7

V

required pulse amplitude

7,7

−

V

Input voltage during horizontal scanning

−−

1,0

V

Input current

−−

100

µA

PARAMETER

SYMBOL

MIN.

TYP.

MAX.

UNIT