TDA4570 Overview
TDA4570 The TDA4570 is an integrated 3,58 MHz or 4,43 MHz NTSC decoder. It is pin sequence patible with multi-standard decoder TDA4555 and pin patible with the PAL decoder TDA4510.
TDA4570 Key Features
- 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 parator which controls the frequency and phase of the reference oscillator and pares the (R-Y) reference with the
- HUE control stage provides phase shifting via the bined 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 au
- Two-function service switch
- position one (V14-3 < 1 V): switches the colour-ON and switches the hue control and burst for the PLL oscillator-OFF, al