Advanced 4-Channel A/V Decoder, MUX and Display Processor

The TW2851 is Techwell’s 5th generation 4-channel A/V decoder, multiplexer and display processor IC for security surveillance applications. The device has four built-in NTSC/PAL video decoders with high-performance adaptive 4H comb filters, noise reduction algorithm, independent and flexible video scalars for the display and record paths and 16x12 matrix motion/blind/night detectors. The device includes advanced record and display multiplexer functions.

Analog Video Decoder

– Accepts all NTSC(M/N/4.43)/PAL(B/D/G/H/I/K/L/M/N/60) standards with auto detection

– 8 analog CVBS inputs for pseudo 8 channel support

– Integrated analog anti-aliasing filters & 10-bit ADCs

– High performance adaptive 4H comb filters for all NTSC/PAL standards

– Proprietary fast video locking system for non-realtime application

– Noise reduction algorithm to remove impulse noise

– Independent & flexible video scalars for display, record and SPOT path

– Four built-in 16x12 matrix motion/blind/night detectors

Display

– Displays up to 32 windows on PC monitor or LCD panel

•H/V Scaling & Mirroring for Each Window

•Live & Playback Video Tiling on Same Display

– Last field/frame image captured when video loss detected

– Live or strobe capture for pseudo 8-ch mode

– Supports dual monitors: Main & Secondary

– Main Display (RGB/LVDS Interface)

• Up to WXGA+ resolution

• Built-in Video Scalar & 2D De-interlacer

• 7-Layer Graphic Overlay including Dual 16-bit Bitmap OSG Layers

– Secondary Display (CVBS Interface)

• Built-in Video Scalar & NTSC/PAL Encoder

• 5-Layer Graphic Overlay including Dual 16-bit Bitmap OSG Layers

– SPOT Display (CVBS Interface)

• Displays up to 16 channels of live camera

• 6-Layer Graphic Overlay including Dual16-bit Bitmap OSG Layers

Record

– Supports BT.656, BT.601 & BT.1120 formats

– Record Resolutions: Full D1, Half D1 and CIF

– Programmable Frame Rates: 1 to 30 fps Flexible Record Output Functions

• Real time & non-real time recording over 27/54MHz clock

• Field switching record modes support up to 120 fields per second

– Embedded Motion Detection & Channel ID Encoder

– 6-Layer Graphic Overlay with Independent 16-bit Bitmap OSG Window for Each Record

– Optional multiplexed digital video output for network function

Playback

– Flexible playback ports supporting BT.656, BT.601, BT.1120 & 24-bit RGB formats

– Supports up to 16-ch non-realtime playback

– Supports 4-ch D1 or 16-ch CIF realtime playback

– Auto cropping & strobe with channel ID decoder for multi-channel playback input

Other Features

– Integrated Audio Codec

– Single DDR SDRAM Memory Controller

– 8/16-bit Parallel Host Interface

– 8/12/16-channel Cascade Support

– 1.2V, 3.3V Supply

– Package: 352-PBGA, 27x27x2.23 mm