GENERAL DESCRIPTION

The SAA7108E; SAA7109E is a new multi-standard video decoder and encoder chip, offering high quality video input and TV output processing as required by PC-99 specifications. It enables hardware manufacturers to implement versatile video functions on a significantly reduced printed-circuit board area at very competitive costs.

FEATURES

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 for best S/N-performance

• Fully programmable static gain or Automatic Gain Control (AGC) for the selected CVBS or Y/C channel

• Switchable white peak control

• Two built-in analog anti-aliasing filters

• Two 9-bit video CMOS Analog-To-Digital Converters (ADCs), digitized CVBS or Y/C signals are available on the IPD (Image Port Data) port under I2C-bus control

• On-chip clock generator

• Line-locked system clock frequencies

• Digital PLL for horizontal sync processing and clock generation, horizontal and vertical sync detection

• Requires only one crystal (either 24.576 MHz or 32.11 MHz) for all standards

• Automatic detection of 50 and 60 Hz field frequency, and automatic switching between PAL and NTSC standards

• Luminance and chrominance signal processing for PAL BGHI, PAL N, combination PAL N, PAL M, NTSC M, NTSC-Japan, NTSC N, NTSC 4.43 and SECAM

• User programmable luminance peaking or aperture correction

• Cross-colour reduction for NTSC by chrominance comb filtering

• PAL delay line for correcting PAL phase errors

• Brightness Contrast Saturation (BCS) and hue control on-chip

• Two multi functional real-time output pins controlled by I2C-bus

• Multi-standard VBI data slicer decoding World Standard Teletext (WST), North-American Broadcast Text System (NABTS), Closed Caption (CC), Wide Screen Signalling (WSS), Video Programming System (VPS), Vertical Interval Time Code (VITC) variants (EBU/SMPTE) etc.

• Standard ITU 656 Y-CB-CR 4 : 2 : 2 format (8-bit) on IPD

output bus

• Enhanced ITU 656 output format on IPD output bus containing:

– active video

– raw CVBS data for INTERCAST applications (27 MHz data rate)

– decoded VBI data

• Detection of copy protected input signals according to the macrovision standard. Can be used to prevent unauthorized recording of pay-TV or video tape signals.

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