TVP5154

` Four Separate Video Decoder Channels With ` Internal Phase-Locked Loop (PLL) for Features for Each Channel: Line-Locked Clock (Separate for Each
Accept NTSC (M, 4.43), PAL (B, D, G, H, I, Channel) and Sampling M, N), and SECAM (B, D, G, K, K1, L) Video ` Sub-Carrier Genlock Output for Synchronizing Data Color Sub-Carrier of External Encoder
Support ITU-R BT.601 Standard Sampling ` Standard Programmable Video Output Format
High-Speed 9-Bit Analog-to-Digital ITU-R BT.656, 8-Bit 4:2:2 With Embedded
Converter (ADC) Syncs
Two Composite Inputs or One S-video Input 8-Bit 4:2:2 With Discrete Syncs (for Each Channel)
Fully Differential CMOS Analog ` Advanced Programmable Video Output Preprocessing Channels With Clamping Formats
and Automatic Gain Control (AGC) for Best 2´ Over-Sampled Raw Vertical Blanking Signal to Noise (SNR) Performance Interval (VBI) Data During Active Video
Brightness, Contrast, Saturation, Hue, and Sliced VBI Data During Horizontal Blanking Sharpness Control Through Inter-Integrated or Active Video Circuit (I<sup>2</sup>C)
` VBI Modes Supported:
Complementary 4-Line (3-H Delay) Adaptive Teletext (NABTS, WST) Comb Filters for Both Cross-Luminance Closed-Caption Decode With FIFO, and and Cross-Chrominance Noise Reduction Extended Data Services (EDS)
Patented Architecture for Locking to Weak, Wide Screen Signaling (WSS), Video Noisy, or Unstable Signals Program System (VPS), Copy Generation
` Four Independent Polymorphic Scalers Management System (CGMS), Vertical
` Single or Concurrent Scaled and Unscaled Interval Time Code (VITC) Outputs Via Dual Clocking Data, Interleaved Gemstar 1´/2´ Electronic Program Guide  54-MHz Data or Single 27-MHz Clock Compatible Mode
` Scaled/Unscaled Image Toggle Mode Gives CPruosgtorammCtohnefSigliucreatEionngiMneodfoerAUllnoiwquseUVsBerI to Variable Field Rate for Both Scaled and Data Signals Unscaled Video
` Improved Fast Lock Mode Can Be Used When
` Low Power Consumption: 700 mW Typical Input Video Standard Is Known and Signals on
` 128-Pin Thin Quad Flat Pack (TQFP) Package Switching Channels Are Clean
` Single 14.31818-MHz Crystal for All Standards
` Four Possible I2C Addresses Allowing 16 and All Channels Decoder Channels on a Single I2C Bus

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under  ecommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device  eliability.

The TVP5154 device is a 4-channel, low-power, NTSC/PAL/SECAM video decoder. Available in a space-saving 128-pin thin quad flat pack (TQFP) package, each channel of the TVP5154 decoder converts NTSC, PAL, or SECAM video signals to 8-bit ITU-R BT.656 format. Discrete syncs are also available. All four channels of the TVP5154 are independently controllable. The decoders share one crystal for all channels and for all supported standards. The TVP5154 can be programmed using a single inter-integrated circuit (I2C) serial interface. The decoder uses a 1.8-V supply for its analog and digital supplies, and a 3.3-V supply for its I/O. The optimized architecture of the TVP5154 decoder allows for low power consumption. The decoder consumes less than 720 mW of power in typical operation.

Each channel of the TVP5154 is an independent video decoder with a programmable polymorphic scaler.

Each channel converts baseband analog video into digital YCbCr 4:2:2 component video, which can then be scaled down to any resolution to 1/256 vertical and 15-bit horizontal in 2-pixel decrements. Composite and S-video inputs are supported. Each channel includes one 9-bit analog-to-digital converter (ADC) with 2´ sampling. Sampling is ITU-R BT.601 (27.0) MHz, generated from a single 14.31818-MHz crystal or oscillator input) and is line locked. The output formats can be 8-bit 4:2:2 with discrete syncs or 8-bit ITU-R BT.656 with embedded synchronization.

The TVP5154 utilizes Texas Instruments patented technology for locking to weak, noisy, or unstable signals. A real-time control (RTC) output is generated for each channel for synchronizing downstream video encoders.Complementary 4-line adaptive comb filtering is available per channel for both the luma and chroma data paths to reduce both cross-luma and cross-chroma artifacts. A chroma trap filter also is available.An improved fast lock mode can be used when the input video standard is known and the signals on the switching channels are clean. Note, switching from snow and/or noisy channels to good channels takes longer. In fast lock mode, video lock is achieved in three fields or less.

Video characteristics, including hue, contrast, brightness, saturation, and sharpness, may be independently programmed for each channel using the industry standard I2C serial interface. The TVP5154 generates synchronization, blanking, lock, and clock signals in addition to digital video outputs for each channel. The TVP5154 includes methods for advanced vertical blanking interval (VBI) data retrieval. The VBI data processor slices, parses, and performs error checking on teletext, closed caption,and other data in several formats.

I²C commands can be sent to one or more decoder cores simultaneously, reducing the amount of I²C activity necessary to configure each core. A register controls which decoder core receives I²C commands,and can be configured such that all four decoders receive commands at the same time.The main blocks for each of the channels of the TVP5154 decoder include:
· Robust sync detector
· ADC with analog processor
· Y/C separation using 4-line adaptive comb filter
· Independent, concurrent scaler outputs
· Chrominance processor
· Luminance processor
· Video clock/timing processor and power-down control
· I²C interface
· VBI data processor