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PDF DM5900 Data sheet ( Hoja de datos )
| Número de pieza | DM5900 | |
| Descripción | 720H 1 channel NTSC/PAL Decoder | |
| Fabricantes | DAVICOM | |
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Hay una vista previa y un enlace de descarga de DM5900 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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DM5900
720H 1 Channel NTSC/PAL Decoder with fast switch function
DAVICOM Semiconductor, Inc.
DM5900
720H 1 channel NTSC/PAL Decoder with
fast switch function
DATA SHEET
Preliminary
Doc No: DM5900-DS-P01
August 19, 2015
Preliminary
Version: DM5900-DS-P01
August 19, 2015
1
1 page  
DM5900
720H 1 Channel NTSC/PAL Decoder with fast switch function
Introduction
The DM5900 is a 1-channel video decoder designed for cameras with 720H CCD sensor.
The DM5900 converts 6.5 MHz analog CVBS signals to digital 27 MHz CCIR656 signals.
The DM5900 integrates an internal PLL. The DM5900 also features a patented fast
switch function. With the fast switch function, the DM5900 can decode up to 2 analog
CVBS with little frame rate loss.
Features
Video Decoder
Accepts NTSC (M,J), PAL (B, D, G, H, I, M, Nc).
Video decoder could be programmed to operate at 27MHz.
Hardware Fast Switch function
Fast Switch also controllable by software or external pin
Software channel ID in active region
10-bits video ADCs with built in 6.5 MHz analog low pass filter
Automatic gain control for Luminance and Chrominance
Programmable brightness, contrast, saturation, hue, and sharpness
5-H comb filter for YC separation
Support video interface YCbCr 4:2:2, 4:1:1, 4:2:0 format
Support mirror function
Chrominance line filter for PAL phase error
DLL for video synchronization, supports 27MHz crystal within +/-1000 ppm variance
Advanced video synchronization for weak and noisy CVBS. Supports video signal
transmitted by 500-meter long cable
Support line lock camera
Preliminary
Doc No: DM5900-DS-P01
August 19, 2015
5
5 Page 
DM5900
720H 1 Channel NTSC/PAL Decoder with fast switch function
Introduction
The DM5900 video decoder contains a Video Synchronization block, an AGC block, an
YC separation block, a UV Demodulation block, a Luma/Chroma Processor block, a
Mirror Function block and a BT 656 output block. A patented Fast Switch is also included.
In addition to CVBS, the DM5900 video decoder supports S-Video as well.
Video Synchronization
Video Synchronization performs video detection function. It automatically detects
NTSC(M), NTSC(443), PAL(B,D,G,H,I), PAL(M), PAL(N), PAL(60). A smart video
detection algorithm has been adopted. Therefore the DM5900 can perform fast and
stable video synchronization even if the input signal is weak or the external crystal is
with error as large as +/- 1000 ppm.
Automatic Gain Control
Automatic Gain Control (AGC) block performs both Luma AGC and Chroma AGC
(CGAC). After video synchronization, Luma AGC adjusts input Luma level to the
standard level (1Vpp). A further CAGC is performed after Luma AGC for signal with
different Luma and Chroma attenuation.
Y/C Separation
Y/C Separation is for CVBS input only. After this block CVBS signal is separated into
Luma and Chroma components. A 5-H 2D comb filter is adapted in the Y/C separation
block.
UV demodulation
After Y/C separation, the UV demodulation block performs UV demodulation to the
Chroma component. The phase and frequency of the UV demodulation is from a color
burst subcarrier tracking block for both NTSC and PAL mode. A UV demodulation LPF is
also adopted to filter out chroma noise.
Preliminary
Doc No: DM5900-DS-P01
August 19, 2015
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet DM5900.PDF ] | |
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