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.