GENERAL DESCRIPTION The 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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