GENERAL DESCRIPTION
●The SAA7114 is a video capture device for applications at the image port of VGA controllers.
●FEATURES
●1.1 Video decoder
●• Six analog inputs, internal analog source selectors, e.g.
● 6×CVBS or (2×Y/C and 2×CVBS) or (1×Y/C and 4×CVBS)
●• Two analog preprocessing channels in differential CMOS style inclusive built-in analog anti-alias filters
●• Fully programmable static gain or Automatic Gain Control (AGC) for the selected CVBS or Y/C channel
●• Automatic Clamp Control (ACC) for CVBS, Y and C
●• Switchable white peak control
●• Two 9-bit video CMOS Analog-to-Digital Converters (ADCs), digitized CVBS or Y/C signals are available on the expansion port
●• On-chip line-locked clock generation in accordance with “ITU 601”
●• Digital PLL for synchronization and clock generation from all standards and non-standard video sources e.g. consumer grade VTR
●• Requires only one crystal (32.11 or 24.576 MHz) for all standards
●• Horizontal and vertical sync detection
●• Automatic detection of 50 and 60 Hz field frequency, and automatic switching between PAL and NTSC standards
●• Luminance and chrominance signal processing for PAL B, G, D, H, I and N, combination PAL N, PAL M, NTSC M, NTSC-Japan, NTSC 4.43 and SECAM
●• Adaptive 2/4-line comb filter for two dimensional chrominance/luminance separation:
●– Increased luminance and chrominance bandwidth for all PAL and NTSC standards
●– Reduced cross colour and cross luminance artefacts
●• PAL delay line for correcting PAL phase errors
●• Independent Brightness Contrast Saturation (BCS) adjustment for decoder part
●• User programmable sharpness control
●• Independent gain and offset adjustment for raw data path.
●1.2 Video scaler
●• Horizontal and vertical downscaling and upscaling to randomly sized windows
●• Horizontal and vertical scaling range: variable zoom to 1⁄64(icon) (it should be noted that the H and V zoom are restricted by the transfer data rates)
●• Anti-alias and accumulating filter for horizontal scaling
●• Vertical scaling with linear phase interpolation and accumulating filter for anti-aliasing (6-bit phase
●accuracy)
●• Horizontal phase correct up and downscaling for improved signal quality of scaled data, especially for compression and video phone applications, with 6-bit phase accuracy (1.2 ns step width)
●• Two independent programming sets for scaler part, to define two ‘ranges’ per field or sequences over frames
●• Fieldwise switching between decoder part and expansion port (X port) input
●• Brightness, contrast and saturation controls for scaled outputs.
●APPLICATIONS
●• Desktop video
●• Multimedia
●• Digital television
●• Image processing
●• Video phone applications.
