TDA4510 Datasheet, PDF (4/9 Pages) NXP Semiconductors – PAL decoder

Philips Semiconductors
PAL decoder
Product specification
TDA4510
FUNCTIONAL DESCRIPTION
DIVIDER STAGES
The divider stages provide −(R-Y) and −(B-Y) reference signals with the correct 90 degrees relation for the demodulators.
PHASE COMPARATOR
The phase comparator compares the −(R-Y) reference signal with the burst pulse and controls the frequency and phase
of the reference oscillator.
IDENTIFICATION DEMODULATOR
The identification demodulator delivers a positive going identification signal for PAL-signals at pin 14, also used for the
automatic colour-killer.
SERVICE SWITCH
The service switch has two functions. The first position (V_14-3 < 1 V) allows the adjustment of the reference oscillator.
Therefore the colour is switched on and the burst for the oscillator PLL is switched off. The second position (V_14-3 > 5 V)
switches the colour on and the output signals can be observed.
SANDCASTLE PULSE DETECTOR
Sandcastle pulse detector for burst-gate, line and blanking (horizontal and vertical) pulse detection. The vertical part of
the sandcastle pulse is needed for the internal colour-on and colour-off delay.
PULSE PROCESSING PART
Pulse processing part which shall prevent a premature switching on of the colour. The colour-on delay, two or three field
periods after identification of the PAL signal, is achieved by a counter. The colour is switched off immediately or at the
latest one field period after disappearance of the identification voltage.
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
Supply voltage range
Currents
at pins 1 and 2
at pin 6
at pin 16
Total power dissipation
Storage temperature
Operating ambient temperature
V_P = V_7-3
−I_1,2
−I₆
−I₁₆
P_tot
T_stg
T_amb
10,8 to 13,2 V
max. 5 mA
max. 15 mA
max. 5 mA
max. 800 mW
−25 to + 150 °C
0 to + 70
°C
March 1986
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