General description

The SAA7108AE; SAA7109AE is a new multistandard 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 Image Port Data (IPD) 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 Hz 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-color 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 multifunctional real-time output pins controlled by the I2C-bus

■ Multistandard 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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