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TDA3592A

SECAM-PAL transcoder

Philips Electronics 

Philips Semiconductors

SECAM-PAL transcoder

Product specification

TDA3592A

Notes to the characteristics

1. The parameter values given in the characteristics are valid only when the following alignment procedure is

performed:

a) Supply a SECAM signal input to pin 3 at 100 mV (peak-to-peak value) without deviation during a red and blue

line (SECAM black colour information).

b) Align the reference tuned circuit so that the output signal from pin 14 to the PAL decoder is minimum during scan

(PAL black colour information).

2. When the input signal to the limiter (pin 3) changes from 300 to 15 mV (peak-to-peak value) the zero point of the

chrominance demodulator shifts by a typical value of 5 kHz; f = 4,33 MHz (typ.).

3. (B-Y) linearity is defined by Vout(yellow)/Vout(blue) where fyellow = (typ.) 4,02 MHz; fblue = (typ.) 4,48 MHz.

4. (R-Y) linearity is defined by Vout(cyan)/Vout(red) where fcyan = (typ.) 4,68 MHz; fred = (typ.) 4,12 MHz.

5. The parameter value is equated by: -(---B------–----D-----)----⁄--F--Y----–-–----(-X--A------–-----C------)----⁄---E--- × -∆---f---(--°-k--C-H-----z---)--

E = E-----1-----2–----E-----2--

F = F-----1----2–-----F----2--

Where

A = demodulated black level at temperature X

B = demodulated black level at temperature Y

C = artificial black level at temperature X

D = artificial black level at temperature Y

E1 = demodulated output signal at temperature X (fo − ∆f)

E2 = demodulated output signal at temperature X (fo + ∆f)

F1 = demodulated output signal at temperature Y (fo − ∆f)

F2 = demodulated output signal at temperature Y (fo + ∆f)

for B-Y: fo = fob = 4,25 MHz (∆f = 230 kHz)

for R-Y: fo = for = 4,40625 MHz (∆f = 280 kHz)

6. During stable signal conditions V7 is always at VF (BAT85) below V6.

7. The burst gate pulse width > 3,45 µs.

8. The specification figures are only valid when the reference tuned circuit is aligned as indicated in note 1.

9. Ensure that the 4,433 MHz carrier is in the correct phase; black level shift at temperature X = A and at Y = B.

Output signal (∆f = 230 kHz for B-Y; ∆f = 280 kHz for R-Y) at temperature X = E and at Y = F.

The parameter is equated by:-[---B------⁄---(---F-----–----B----)---Y-]----––-----X-[--A------⁄---(---E-----–-----A----)---]-- × 230; 280 kHz

10. Chrominance definition − burst ratio at SECAM condition (pin 9).

The parameter is equated by:-V---V-o---u-b-t-u--(-r-p-s--–-t--(-p-p-)---–R---p--e-)--d-(---R-(---R--–----–Y----Y)----)-- .

January 1988

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