NXP Semiconductors TDA4570
The TDA4570 is an integrated 3,58 MHz or 4,43 MHz NTSC decoder. It is pin sequence compatible with multi-standard decoder TDA4555 and pin compatible with the PAL decoder TDA4510. The vertical part of the sandcastle pulse is used for the internal colour-ON and colour-OFF delay • Pulse processing part for the prevention of premature switching ON of the colour.| Part No. | TDA4570 |
|---|---|
| Datasheet | TDA4570 Download |
| Manufacturer |  NXP Semiconductors |
| Description | NTSC decoder |
| Buy | Stock & Price |
GENERAL DESCRIPTION
TDA4570FEATURES
Chrominance part● Gain controlled amplifier with operating point control stage
● ACC (automatic chrominance control) with sampled rectification during burst-key signal
● Blanking circuit for the colour burst signal Oscillator and control voltage part
● Voltage controlled reference oscillator for double subcarrier frequency
● Divider stages which provide the correct 90° phase between −(R-Y) and −(B-Y) reference signals for the demodulators
● Phase comparator which controls the frequency and phase of the reference oscillator and compares the (R-Y) reference with the burst pulse
● HUE control stage provides phase shifting via the combined service and hue control input (pin 11)
● Identification demodulator provides a positive-going identification signal at pin 14 for NTSC signals and acts as the automatic colour killer
● Two-function service switch: – position one (V14-3 < 1 V): switches the colour-ON and switches the hue control and burst for the PLL...
