SAF7113 Descrizione generale
GENERAL DESCRIPTIONThe 9-bit video input processor is a combination of a two-channel analog preprocessing circuit including source selection, anti-aliasing filter and ADC, an automatic clamp and gain control, a Clock Generation Circuit (CGC), a digital multi-standard decoder (PAL BGHI, PAL M, PAL N, combination PAL N, NTSC M, NTSC-Japan, NTSC N and SECAM), a brightness, contrast and saturation control circuit, a multi-standard VBI data slicer and a 27 MHz VBI data bypass; see Fig.1.FEATURES• Four analog inputs, internal analog source selectors, e.g. 4 × CVBS or 2 × Y/C or (1 × Y/C and 2 × CVBS)• Two analog preprocessing channels in differential CMOS style for best S/N-performance• Fully programmable static gain or automatic gain control 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 VPO-port via 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 (24.576 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 N, NTSC 4.43, NTSC-Japan 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• Real-time status information output (RTCO)• 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, Wide Screen Signalling (WSS), Video Programming System (VPS), Vertical Interval Time Code (VITC) variants (EBU/SMPTE) etc.• Standard ITU 656 YUV 4 : 2 : 2 format (8-bit) on VPO output bus• Enhanced ITU 656 output format on VPO output bus containing: – active video – raw CVBS data for INTERCAST applications (27 MHz data rate) – decoded VBI data• Boundary scan test circuit complies with the “IEEE Std. 1149.b1 - 1994” (ID-Code = 1 7113 02B)• I2C-bus controlled (full read-back ability by an external controller, bit rate up to 400 kbits/s)• Low power (<0.5 W), low voltage (3.3 V), small package (QFP44)• Power saving mode by chip enable input• 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.APPLICATIONS• Notebook (low power consumption)• PCMCIA card application• AGP based graphics cards• Image processing• Video phone applications• Intercast and PC teletext applications• Security applications.
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