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www.DataSheet4U.com
ASAHI KASEI
[AK8851]
Preliminary
AK8851
NTSC/PAL/SECAM Digital Video Decoder
General Description
The AK8851 is an integrated chip that decodes NTSC, PAL, SECAM composite and S Video signals.. The digital output of the AK8851 is in Y, Cb, Cr signal format which compliances with ITU-R BT.601 and ITU-R BT.656* specifications. An internally generated pixel clock is synchronized with an input signal. The clock rate is 27 MHz. When Closed Caption, VBID or WSS information are encoded on input Video signal, they are externally accessible.
Features
• NTSC-M, NTSC-4.43/PAL-B, D, G, H, I, N, Nc, M, 60/SECAM Composite signals and S Video signal decoding function • On-chip dual 10 Bit ADCs (27 MHz operation) • Built-in PLLs for input-signal-synchronized clock generation (Line-locked PLL and Frame-locked PLL) • On-chip Programmable Gain Amp (PGA), ranging from 0 dB to 12 dB • Auto Color Control (ACC) • Auto Gain Control (AGC) • Automatic input signal distinction function • Adaptive 3-/5-line (NTSC/PAL) YC Separation • Phase compensation function for PAL signal decoding • ITU-R BT.656 format output (4:2:2 8 Bit parallel output with EAV / SAV)/ 16-Bit output is also available • NTSC Closed Caption signal decoding function • VBID (CGM-A) Program condition decoding function (CRCC decode) • WSS Program condition decoding function • VBI slicer function • Macrovision Certification • Power down function • 6 – channel Analog inputs • I2C Control • 3.3 V +/- 10 % CMOS • 100 Pin LQFP package
Note: * ITU-R BT.656 spec compatibility requires appropriate input signal quality.
MS0244-E-03
1
2005 / 07
Confidential
ASAHI KASEI
[AK8851]
www.DataSheet4U.com
1.Functional Block Diagram
CLK SELA SDA SCL /RESET
Microprocessor I/F Register Phase Error IRefR1 CLOCK Module 27MHz Timing Contorller
&
NSIG CLK27MO HALFCKO /DVALID VSYNC HSYNC CSYNC Luma- Processing FIELD
VCO Controller
EXTCLP
- Sync-Separation - AGC Info. - Closed Caption - VBID,WSS - WSS
Y
AIN1 AIN2 AIN3 AIN4 AIN5 AIN6
Analog Process - Analog Multiplexer - Clamp - PGA
CVBS Y C
Y/C Separation 2D-3Line or 1D-BPF
Y
- Brightness Ctrl - Contrast Ctrl - Sharpness Ctrl
Y
Output Processing - Pixel Interpolator - VBI Slicer - Rec.656 formatter - 656 Output Buffer
U
10-bit ADC 10-bit ADC Decimation Filter
C
D[7:0]
Chroma- Processing CLPCA P1 CLPCA P2
C
EXTDAT[7:0]
13.5MHz
DFS & Chroma PLL
-
Demodulation ACC HUE Ctrl Saturation Ctrl
V
TEST
VREF
AVDD
AVSS VRP VCOM VRN VREF IRefR2
/PD
DVDD
DVSS
MS0244-E-03
2
2005/07
Confidential
ASAHI KASEI
www.DataSheet4U.com
[AK8851]
2. Pin Assignment
DVSS CLKINV /RESET /PD EXTCLP AVSS AVDD AVSS AVSS AVSS AVSS AVSS VFEFOUT AVDD IREFR1 IFEFR2 AVSS AVSS AVDD CLPCAP1 AIN1 AVSS AIN2 AVSS AIN3
75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 76 50 77 49 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28
NC SCL SELA SDA DVSS DVDD CLKIN DVDD DVSS DVSS NC NC DVDD DVSS DVSS DVDD CLK27MO HALFCKO DVDD DVSS EXTDAT7 EXTDAT6 DVDD DVSS DVSS
EXTDAT5 EXTDAT4 EXTDAT3 EXTDAT2 DVDD DVSS DVSS DVDD EXTDAT1 EXTDAT0 DVDD AVSS D7 D6 DVDD DVSS D5 D4 D3 D2 DVDD DVSS D1 D0 DVSS
AK8851
27 100 26 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
VRP VRN VCOM AVSS AVDD AVSS AIN4 CLPCAP2 AIN5 AVSS AIN6 AVSS AVSS DVSS DVDD NSIG DVALID FIELD CSYNC DVSS DVDD DVDD
MS0244-E-03
3
DVSS HSYNC VSYNC
2005 / 07
Confidential
ASAHI KASEI 3. Pin Functional Description www.DataSheet4U.com PIN# Symbol I/O 1 VRP O 2 VRN O 3 VCOM O 4 AVSS G 5 AVDD P 6 AVSS G 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 AIN4 CLPCAP2 AIN5 AVSS AIN6 AVSS AVSS DVSS DVDD NSIG DVALID FIELD CSYNC DVSS DVDD DVDD DVSS HSYNC VSYNC DVSS D0 D1 DVSS DVDD D2 D3 D4 D5 DVSS DVDD D6 D7 AVSS DVDD EXTDAT0 EXTDAT1 DVDD DVSS DVSS DVDD EXTDAT2 EXTDAT3 EXTDAT4 EXTDAT5 DVSS DVSS DVDD EXTDAT6 EXTDAT7 I O I G I G G G P O O O O G P P G O O G O O G P O O O O G P O O G P O O P G G P O O O O G G P O O
[AK8851] Function Internal reference positive Voltage for AD Converter Internal reference negative Voltage for AD Converter Common voltage for AD Converter Ground pin for Analog Analog supply voltage (3.3V) Ground pin for Analog Analog Video Signal Input pin. Input –6dB analog video signal via 0.1uF capacitor. Capacitor for clamp. Connect 0.1uF ceramic capacitor between AVSS Analog Video Signal Input pin. Input –6dB analog video signal via 0.1uF capacitor. Ground pin for Analog Analog Video Signal Input pin. Input –6dB analog video signal via 0.1uF capacitor. Ground pin for Analog Ground pin for Analog Ground pin for Digital Digital supply voltage (3.3V) No-signal indicator. H: No input video Signal L: Video Signal Input Active video data (720pixel) indicator Timing signal for FIELD Timing signal for CSYNC Ground pin for Digital Digital supply voltage (3.3V) Di.