TDA4510/V9 Просмотр технического описания (PDF) - Philips Electronics

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TDA4510/V9

PAL decoder

Philips Electronics 

Philips Semiconductors

PAL decoder

Product specification

TDA3561A

11. Brightness control

The black level of the RGB outputs can be set by the

voltage on this pin (see Fig.5). The black level can be set

higher than 4 V however the available output signal

amplitude is reduced (see pin 7). Brightness control also

operates on the black level of the inserted signals.

12, 14, 16. RGB outputs

The output circuits for red, green and blue are identical.

Output signals are 5,25 V (R, G and B) at nominal input

signals and control settings. The black levels of the three

outputs have the same value. The blanking level at the

outputs is 2,1 V. The peak white level is limited to 9,3 V.

When this level exceeded the output signal amplitude is

reduced via the contrast control (see pin 7).

25, 26. Reference oscillator

The frequency of the oscillator is adjusted by the variable

capacitor C1. For frequency adjustment interconnect pin

21 and pin 22. The frequency can be measured by

connecting a suitable frequency counter to pin 25.

28. Output of the chroma amplifier

Both burst and chroma signals are available at the output.

The burst-to-chroma ratio at the output is identical to that

at the input for nominal control settings. The burst signal is

not affected by the controls. The amplitude of the input

signal to the demodulator is kept constant by the A.C.C.

Therefore the output signal at pin 28 will depend on the

signal loss in the delay line.

13, 15, 17. Inputs for external RGB signals

The external signals must be a.c.-coupled to the inputs via

a coupling capacitor of about 100 nF. Source impedance

should not exceed 150 Ω. The input signal required for

a 5 V peak-to-peak output signal is 1 V peak-to-peak.

At the RGB outputs the black level of the inserted signal is

identical to that of normal RGB signals. When these inputs

are not used the coupling capacitors have to be connected

to the negative supply.

18, 19, 20. Black level clamp capacitors

The black level clamp capacitors for the three channels are

connected to these pins. The value of each capacitor

should be about 100 nF.

21, 22. Inputs (B-Y) and (R-Y) demodulators

The input signal is automatically fixed to the required level

by means of the burst phase detector and A.C.C.

generator which are connected to pin 21 and pin 22. As the

burst (applied differentially to those pins) is kept constant

by the A.C.C., the colour difference signals automatically

have the correct value.

23, 24. Burst phase detector outputs

At these pins the output of the burst phase detector is

filtered and controls the reference oscillator. An adequate

catching range is obtained with the time constants given in

the application circuit (see Fig.6).

September 1982

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