Video Decoder 9ADC 1DAC 10-Bit 68-Pin QFN

The TW2984 is a low power NTSC/PAL video decoder chip that is designed for video surveillance applications. It consumes very low power in a typical composite input application. The available power down mode further reduces the power consumption. It uses the 1.0V for digital supply voltage and 3.3V for I/O and analog power. A single 27MHz crystal is all that needed to decode all analog video standards. The video decoder decodes the base-band analog CVBS into digital 8-bit 4:2:2 YCbCr for output. It consists of analog front-end with input source selection, variable gain amplifier and analog-to-digital converters, Y/C separation circuit, multi-standard color decoder (PAL BGHI, PAL M, PAL N, combination PAL N, NTSC M, NTSC 4.43) and synchronization circuitry. The Y/C separation is done with high quality adaptive 4H (5-line) comb filter for reduced cross color and cross luminance. The advanced synchronization processing circuitry can produce stable pictures for non-standard signal as well as weak signal.

• WD1 (960H) and D1 compatible video decoding operation and it is programmable each channel
• NTSC (M, 4.43) and PAL (B, D, G, H, I, M, N, N combination), PAL (60) support with automatic format detection
• Software selectable analog inputs allows any of 2 CVBS per one video ADC
• Built-in analog anti-alias filter
• Four 10-bit ADCs and analog clamping circuit for CVBS input
• Fully programmable static gain or automatic gain control for the Y channel
• Programmable white peak control for CVBS channel
• 4-H adaptive comb filter Y/C separation
• PAL delay line for color phase error correction
• Image enhancement with peaking and CTI
• Digital sub-carrier PLL for accurate color decoding
• Advanced synchronization processing and sync detection for handling non-standard and weak signal
• Programmable hue, brightness, saturation, contrast, sharpness
• Automatic color control and color killer
• ITU-R 656 like YCbCr (4:2:2) output or time multiplexed output with 36/72/144MHz for WD1 or 27/54/108MHz for D1 format
• Integrated five audio ADCs processing and one audio DAC
• Provides multi-channel audio mixed analog output
• Support I2S/DSP Master/Slave interface for record output and playback input
• PCM 8/16-bit and u-Law/A-Law 8-bit for audio word length