XV750C

The XV750C has the following features including Built-in three (3) channel 10-bit ADCs;Analog composite (CVBS) and S-video inputs;Supports analog component signal input ;Four (4) line inputs (CVBS, S-video or component is selectable for each line input);Detects Video systems and automatically switches over;Built-in high image quality Y/C separation circuit (adaptive comb filter );Built-in Holizontal/Vertical aperture correction circuit;Built-in automatic-gain control AGC/ACC circuit;Built-in programmable filter (24 taps);Built-in scaler (Horizontal: 1/8 to 2 times, Vertical: 1/8 to 1 time);Supports ITU-R BT.601 and 656 output formats (only for SV line output);Selectable YCbCr/ RGB color spaces .

The XV750C is a high quality video decoder capable of converting NTSC, PAL and SECAM video  signals or analog component video signals into digital video signals. Its built-in scaling function makes it possible to independently set the horizontal and vertical scaling ratios, enabling, for example, of giving output images at the aspect ratio of square pixels. Two kinds of video output ports namely SV port for streaming output (image data synchronized with input video sync) and DV port for scaling data output, can simultaneously provide image data.The XV750C uses a 27MHz clock for digitally sampling the video signals.As to the clock signals fed to XV750C, two kinds of solutions are readily available, namely free-running operation and VCXO operation. The XV750C is furnished with an external VCXO controlling circuit to generate a sampling clock by way of burst-lock or H-lock (line-lock.), giving controlling voltage output in PWM for the external VCXO circuit.
 
The XV750C has a built-in decimation filter in order to degrade the video signals that have been originally sampled at 27MHz sampling rate at the analog front end down to 13.5MHz sampling rate.The case where comb filter is selected is limited when color sub-carriers on adjacent lines  bear 180-degree (90-degree in the case of PAL) phase difference. Even in the case of such video system, if once the color sub-carriers move  away from the above mentioned standard phase difference, the filter will automatically be switched over to trap and band pass filter.