DATASHEET FN7742 TW2837 Rev. 1.00 August 28, 2012 4-Channel Video and Audio Controller for Security Applications The TW2837 has four high quality NTSC/PAL video Features decoders, dual color display controllers and dual video FOUR VIDEO DECODERS encoders. The TW2837 contains four built-in analog anti-aliasing filters, four 10-bit Analog-to-Digital Accepts all NTSC(M/N/4.43) / converters, and proprietary digital gain/clamp PAL(B/D/G/H/I/K/L/M/N/60) standards with auto controller, high quality Y/C separator to reduce cross- detection noise and high performance free scaler. Four built-in Integrated four video analog anti-aliasing filters and motion, blind and night detectors can increase 10-bit CMOS ADCs security system feature. High performance adaptive 4H comb filters for all NTSC/PAL standards The TW2837 has flexible video display/record/playback controller including basic IF compensation filter for improvement of color display and MUX functions. The TW2837 also has demodulation excellent graphic overlay function, which displays Color Transient Improvement (CTI) bitmap for OSD, single box, 2D array box, and mouse Automatic white peak control pointer. The built-in channel ID CODEC allows auto Programmable hue, saturation, contrast, brightness decoding and displaying during playback and the and sharpness additional scaler on the playback supports multi- Proprietary fast video locking system for non-real- cropping function of the same field or frame image. time application The TW2837 contains two video encoders with three 10-bit Digital-to-Analog converters to provide 2 High performance horizontal and vertical scaler for composite or S-video. The TW2837 also includes each path including playback input audio CODEC that has four audio Analog-to-Digital Four built-in motion detectors with 16X12 cells and converters and one Digital-to-Analog converter. A blind and night detectors built-in audio controller can generate digital outputs Additional digital input for playback with ITU-R for recording/mixing and accepts digital input for BT.656 standard playback. The TW2837 can be extended up to 8/16 Auto cropping / strobe for playback input with channel video controller using chip-to-chip cascade Channel ID decoder connection. Supports four channel full D1 record mode FN7742 Rev. 1.00 Page 1 of 232 August 28, 2012 TW2837 2 Supports a standard I S interface for record output DUAL VIDEO CONTROLLERS and playback input Supports full triplex function with 4 Ch live, 4 Ch PCM 8/16-bit and u-Law/A-Law 8-bit for audio word playback display and 4 Ch record output length Analog/Digital channel ID CODEC for record and Programmable audio sample rate that covers playback applications popular frequencies of 8/16/32/44.1/48kHz Supports adaptive median filter for Record Supports pseudo 8 channel and/or dual page Changes from TW2835 mode Horizontal/Vertical mirroring for each TW2837 is very similar to its previous version chip channel TW2835. The changes are as follows. Last image captured when video-loss detected Auto sequence switch with 128 queues and/or Provides higher quality video picture with a manual switch by interrupt for record path complete re-design of front-end video decoders Channel skip in auto sequence switch for record Provides a new audio decoder with better audio path when video-loss detected quality and also an extra audio PLL for accurate 8kHz/16kHz sampling rate Image enhancement for zoomed or still image in display path An enhanced OSD with 256 color look up table High performance 2X zoom to horizontal and vertical Provides OSD Block Move / Block Fill / Bitmap Burst direction for display path Write function to enhance the OSD buffer write performance. With these functions, MCU is relieved Extendable up to 8/16 channel video controller from filling the OSD buffer pixel by pixel, therefore using cascade connection achieving much faster OSD buffer update rate Quad MUX switch with 32 queues and/or manual Maintains backward compatibility to TW2835 on the control by interrupt for record path OSD features. All previous OSD control registers are 256 color bitmap OSD overlay with 720x480 in still available. To use the new feature, however, the NTSC / 720x588 resolution in PAL SAVE/RECALL feature is limited to 3 frames / 6 Four programmable single boxes and four 2D fields rather than 4 frames / 8 fields as was in arrayed boxes overlay TW2835 Mouse pointer overlay DUAL VIDEO ENCODERS Applications Dual path digital outputs with ITU-R BT.656 standard Analog QUAD/MUX System Dual path analog outputs with all analog NTSC/PAL 4/8/16 Channel DVR System standards Car Rear Vision System Programmable bandwidth of luminance and Hair Shop System chrominance signal for each path Dental Care System Three 10-bit video CMOS DACs AUDIO CODEC Integrated four audio ADCs and one audio DAC Provides multi-channel audio mixed analog output FN7742 Rev. 1.00 Page 2 of 232 August 28, 2012