The TW2965 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 each channel is programmable
  • 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
  • Digital Horizontal PLL for synchronization processing and pixel sampling
  • 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
  • Programmable audio sample rate that covers popular frequencies of 8/16/32/44.1/48kHz
  • Two-wire MPU serial bus interface
  • Integrated clock PLL for 144/108MHz clock output
  • Embedded video encoder
  • Power save and Power down mode
  • Low power consumption
  • Single 27MHz crystal for all standards and both WD1 and D1 format
  • 3.3V tolerant I/O
  • 1.0V/3.3V power supply
  • 128-pin LQFP package




Type Title Date
Datasheet PDF 3.82 MB
End Of Life Notice PDF 603 KB
Price Increase Notice PDF 208 KB
Product Advisory PDF 363 KB
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Design & Development