TDA8505 datasheet(18/32 Pages) PHILIPS

18 / 32 page

July 1994

Philips Semiconductors

Preliminary speciﬁcation

SECAM encoder

TDA8505

Notes

1. The threshold level of pin 2 is 700

± 20 mV. The specification of the HIGH and LOW levels is in accordance with the

scart fast blanking.

2. The black level of input signal must be 2 V; amplitude 1 V (peak-to-peak value) nominal (Y = 700 mV,

SYNC = 300 mV).

3. The tolerances of fOR and fOB are with the printed-circuit board <±5 kHz. This value can be influenced by the print

layout.

4. The oscillator operates in series-resonance. The resonance resistance of the crystal must be

<60 Ω and parallel

capacitance of the crystal

<10 pF.

INTERNAL CIRCUITRY

Vext (pin 19)

Iext

external supply current

−−

1.5

SAND output (pin 20; Vext = 13.2 V); see Fig.8

Isink(max)

maximum sink current

100

−−µA

Isource(max)

maximum source current

100

−−µA

VTL

top voltage level

Vext < 10 V

Vext − 0.

−−

Vext > 10 V

−−

NAME

CIRCUIT

DESCRIPTION

−(R−Y)

−(R−Y) input; connected via 47 nF

capacitor; 1.05 V (peak-to-peak

value) for EBU bar of 75%;

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