The SDA 9188-3X Picture-in-Picture (PIP) processor with on-chip PLL combines two asynchronous picture sources so that a small moving picture (the inset picture) can be superimposed in a moving picture of normal size (the parent picture). The components of the video signal of the inset source have to be fed in a digitized form to the SDA 9188-3X (figure 1). Amplitude resolution of the signal components is 6 bit at a sampling rate of 13.5 MHz for the luminance signal and 3.375 MHz for the chrominance signals.