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TDA4557 Datasheet(PDF) 8 Page - NXP Semiconductors |
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TDA4557 Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 11 page March 1991 8 Philips Semiconductors Product specification Multistandard decoder TDA4557 Notes 1. Value measured without influence of external circuitry. 2. Or not connected. 3. The signal amplitude of the colour difference signals (R-Y) and (B-Y) is dependent on the characteristics of the external tuned circuits at pins 7, 8 and 4, 5 respectively. Adjustment of the amplitude is achieved by varying the Q-factor of these tuned circuits. The resonant frequency must be adjusted such that the demodulated output frequency (fo) provides the same output level as the internally inserted reference voltage (achromatic value). 4. The sandcastle pulse is compared with three internal threshold levels, which are proportional to the supply voltage. Sandcastle pulse detector (see note 4) Input voltage pulse levels (pin 24) to separate vertical and horizontal blanking pulses V24-9 1.3 1.6 1.9 V required pulse amplitude V 24(p-p) 2.0 2.5 3.0 V to separate horizontal blanking pulse V24-9 3.3 3.6 3.9 V required pulse amplitude V24(p-p) 4.1 4.5 4.9 V to separate burst gating pulse V24-9 6.6 7.1 7.6 V required pulse amplitude V24(p-p) 7.7 − VP V Input voltage during horizontal scanning V24-9 −− 1.0 V Input current −I 24 −− 100 µA PARAMETER SYMBOL MIN. TYP. MAX. UNIT |
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