RN6752 CVBS转BT656/601 支持720P,1080N，替代GM7150BC，CJC5150，TVP5150等AHD芯片

General Description

  RN6752 is a feature rich, high quality 1-channel HD video decoder chip, in which the integrated 10-bit ADC with a maximum sampling rate of 72MHz is used to digitize the video signal at 4x over-sampling rate. The associated Clamping and automatic gain control (AGC) circuit hold the AC coupled signal to a DC level as well as set the signal gain for maximum signal dynamic range before digitization. The analog front-end (AFE) with automatic gain control (AGC) can accept an input signal ranging from 250mV to 1.3V and allows signals from the source directly applied to the decoder input without going through extra gain/attenuation stage. The accurate color carrier phase acquisition is achieved by the low jitter phase lock loop (PLL).

   With an improved and robust sync processing circuit, horizontal and vertical SYNC pulses can be correctly extracted from a CVBS, AHD1.0, 1080N, or luminance (Y) signal. Working together with the AFE, very weak or noisy video signals can be reliably decoded. Variants of NTSC/PAL signals or AHD1.0 can be detected automatically, and an advanced 2D 5-line comb filter yields the minimum artifacts in performing Y/C separation. The video post-processing functions such as color space conversion, brightness, contrast, saturation, and hue control are independently adjustable for each channel via the I2C interface.

   RN6752’s video data port is programmable to transmit in the standard ITU-R BT.656 4:2:2 format for D1 resolution video or the ITU-R BT.1302 video data format to provide higher image resolution. In this format, 960 active pixel per horizontal line will be transmitted at 36 MHz byte clock rate. Higher resolution image, such as 720p or 1080N, can be transmitted using BT.656-like format with 72 MHz byte clock rate.

   With a 32-pin, 5mmx5mm QFN package and up to 8KV ESD HBM, RN6752 is the best solution for high resolution analog to digital video conversion applications in terms of functionality, video quality, price, reliability, and overall customer support. Typical applications of RN6752 include, but not limited to: standalone security DVR, automobile dash cam and video recorder.


Features
  Video Decoder
     Two analog composite video inputs or one S-Video input
     Flexible analog video decoder with built-in analog anti-aliasing filter
     Support NTSC (J,M,4.43), PAL (B,D,G,H,I,M,N,Nc) composite video inputs
     Support HD video inputs from AHD1.0 and OVI1080N video sources
    Automatic detection of NTSC/PAL variants, 720p, and 1080N decoding
    High performance 10-bit ADCs with automatic gain control (AGC) offers 10-bit resolution for superior picture resolution and sharpness
    ADC sampling rate up to 72 MHz for best color and image transient response
    Fully differential pre-processing and AGC (250mV ~1.3V) for best S/N performance
    Proprietary fast and robust video synchronization with accurate clamping and gain control
    Low jitter PLL (50ps peak-to-peak) for accurate color carrier phase acquisition
    2D 5-line comb filter provides the high quality video decoding of composite video signal for artifact-free Y/C separation
    True 10-bit processing for color space conversion, brightness/contrast/saturation/hue control, and color correction for best performance
    Vertical and horizontal cropping
    Selectable 8-bit standard ITU-R BT.656/BT.1302/BT656-like YCbCr 4:2:2 format digital outputs
    Selectable 13.5/27 or 18/36/72 MHz clock output with phase and delay adjustments
    Increased range and new attenuation option for improved peaking function
    Support black/white stretch, and sharpness enhancement post-processing functions

    Support programmable TX coaxial communication to control camera operations

Miscellaneous
   I2C interface for control and status registers
   Only requires a single 26/27 MHz crystal or a 26/27/54/108 MHz clock source on XIN pin directly
   Up to 8KV ESD HBM
   Industrial temperature range from -40°C to 85°C available
   3.3V and 1.2V power supplies
   Flexible 1.8V to 3.3V I/O interface voltage
   32pin QFN package (5mm x 5mm)


Block Diagram



Pin Diagram



Pin Descriptions
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I2C address setting

RN6752 provides an I2C slave interface for programming internal control registers. After power-on or the external reset has transitioned from low to high, RN6752 will capture I2CSEL pin state to determine its I2C device address. User can set their desired device address through weak pull-up/down on this pin. The I2C address can be either 0x2C or 0x2D.

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