Overview

Description

The TW2837 is an improved version of TW2835 with four high quality NTSC/PAL video decoders, dual color display controllers and dual video encoders. The device includes four built-in analog anti-aliasing filters, four 10-bit ADCs, a proprietary digital gain/clamp controller, a high quality Y/C separator to reduce cross noise, and a high performance free scaler. The TW2837 has four built-in motion, blind and night detectors and a flexible video display/record/playback controller supporting basic display and MUX functions. The device also has an enhanced 256-color OSD that can display bitmap, single box, 2D array box, and mouse pointer. The built-in channel ID CODEC allows auto decoding and displaying during playback, and the additional scaler on the playback supports multi-cropping function of the same field or frame image. The TW2837 has two NTSC/PAL video encoders with three 10-bit DACs that can support composite and S-video outputs. The TW2837 also has an improved audio CODEC which has four audio ADCs and one DAC. A built-in audio controller can generate digital outputs for recording/mixing and accept digital input for playback. The TW2837 can be configured up to 8/16 channel video controller using chip-to-chip cascade connection. TW2837 is pin-to-pin compatible to TW2835.

Features

  • Improved video decoder with adaptive 4H comb filters for all NTSC and PAL standards
  • An enhanced OSD with 256 color look up table and supports OSD Block Move, Block Fill and Bitmap Burst Write functions to enhance the OSD buffer write performance
  • PCM 8/16-bit and u-Law/A-Law 8-bit for audio word length
  • Additional audio PLL for accurate 8KHz/16KHz sampling rate
  • Programmable audio sample rates: 8, 16, 32, 44.1 and 48kHz
  • Video field locked audio sample support
  • Audio master/slave I2S interface for playback and record Video Decoder
  • Accepts all NTSC(M/N/4.43)/PAL (B/D/G/H/I/K/L/M/N/60) standards with auto detection
  • Integrated four video analog anti-aliasing filters and 10 bit CMOS ADCs
  • IF compensation filter for improvement of color demodulation
  • Color Transient Improvement (CTI)
  • Automatic white peak control
  • Programmable hue, saturation, contrast, brightness and sharpness
  • High performance horizontal and vertical scaler for each path including playback input
  • Supports ITU-R BT.656 format or time multiplexed output with 54MHz or 108MHz
  • Auto cropping/strobe for playback input with Channel ID decoder
  • Supports four channel full D1 record mode Dual Video Encoders
  • Dual path digital outputs with ITU-R BT.656 standard
  • Dual path analog outputs with all analog NTSC/PAL standards
  • Programmable bandwidth of luminance and chrominance signal for each path
  • Three 10-bit video CMOS DACs Dual Video Controllers
  • Support full triplex function with 4ch live, 4ch playback display and 4ch record output
  • Analog/Digital channel ID CODEC for record and playback application
  • Support adaptive median filter for Record
  • Supports pseudo 8 channel and/or dual page mode
  • Horizontal/Vertical mirroring for each channel Last image captured when video-loss detected
  • Auto sequence switch with 128 queues and/or manual switch by interrupt for record path
  • Channel skip in auto sequence switch for record path when video-loss detected
  • Image enhancement for zoomed or still image in display path
  • High performance 2X zoom to horizontal and vertical direction for display path
  • Extendable up to 8/16 channel video controller using cascade connection
  • Quad MUX switch with 32 queues and/or manual control by interrupt for record path
  • 256 color bitmap OSD overlay with 720x480 in NTSC / 720x588 resolution in PAL
  • Four programmable single boxes and four 2D arrayed boxes overlay
  • Mouse pointer overlay Audio CODEC
  • Integrated four audio ADCs and one audio DAC
  • Provides multi-channel audio mixed analog output
  • Supports a standard I2S interface for record output and playback input
  • PCM 8/16 bit and u-Law/A-Law 8bit for audio word length
  • Programmable audio sample rate that covers popular frequencies of 8/16/32/44.1/48kHz

Comparison

Applications

Applications

  • Security Surveillance
  • Analog QUAD/MUX System
  • 4/8/16 Channel DVR System
  • Car Rear Vision System
  • Hair Shop System
  • Dental Care System

Documentation

Type Title Date
Datasheet PDF 9.52 MB
End Of Life Notice PDF 603 KB
Product Advisory PDF 259 KB
Product Change Notice PDF 106 KB
Price Increase Notice PDF 208 KB
5 items

Design & Development

Models