TDA8501 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TDA8501

PAL/NTSC encoder

Philips Electronics 

Philips Semiconductors

PAL/NTSC encoder

Preliminary specification

TDA8501

Fig.9 Nominal Y + SYNC signal level at pin 22

(PAL mode).

NTSC option with internal set-up generation

Pin 4 connected to ground or left open-circuit. The set-up

is generated internally and the input signals have the

values already specified in section Input stage. The set-up

is not suppressed during vertical sync.

NTSC option without internal set-up generation

Pin 4 connected to VCC. This option places some

restrictions on the input signals as follows:

• if the output signal must be according to the NTSC

standard, the input signals must be generated with a

specific set-up level

• for R, G and B inputs a set-up level of 53 mV is required,

therefore the specified amplitude must be 753 mV

(peak-to-peak) instead of 700 mV (peak-to-peak)

• for U, V and Y inputs a set-up level for Y of 76 mV is

required, therefore the specified amplitude must be

1076 mV (peak-to-peak) (without sync) instead of 1 V

(peak-to-peak). This option, combined with U, V and Y

inputs, is not possible if VCC is < 4.75 V.

Fig.10 Nominal Y +SYNC signal level at pin 22

(NTSC mode).

April 1993

10

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