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ASAHI KASEI
[AK8850]
AK8850
NTSC Digital Video Decoder
General Description
The AK8850 decodes NTSC composite video, S-Video and Component Video signals (525/625) into digital formats. Digital output conforms to ITU-R BT.601 and ITU-R BT.656* YCrCb specifications. The AK8850 outputs a control signal to generate clocks synchronized with either Horizontal Sync or Vertical Sync signals. Its clock rate is 27 MHz. An encoded VBID Closed Caption signal can be extracted from the video signal and sent to an external pin on the AK8850.
Features
NTSC-M Composite signal and S-Video signal decoder Component Video decoder for 525 / 625 systems ( Betacam,MII,EBU N10 ) On-chip triple 10-Bit ADCs ( 27 MHz operation ) On-chip Programmable Gain Amp ( PGA ), ranging from 0 dB to 12 dB in 0.1 dB / steps Input-synchronized clock is generated by an external VCXO Sub-Carrier generation by Digital Synthesizer ( DFS ) Auto Color Control ( ACC ) Auto Gain Control ( AGC ) Adaptive 3-line Y-C separation ITU-R BT.656 format output ( 4:2:2 8-Bit parallel output with EAV / SAV ) NTSC Closed Caption signal decoding function VBID Program condition decoding function WSS Program condition decoding function Video Aspect Signal decoding function on Line 16 and Line 279 Sleep function 6–channel Analog inputs I2C Control 3.3 V CMOS 100-Pin LQFP package
note: * ITU-R BT.656 spec may not be satisfied, as it is dependent upon input signal quality.
Rev.0
1
2002/01
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ASAHI KASEI 1. Functional Block Diagram
IVCXO CLK CLKINV
[AK8850]
NSTD LLPF LLPFC FLPF FLPFC IRefR1 CLOCK Module 27MHz Phase Error Timing Contorller
&
NSIG CLK27MOUT HALFCLKOUT DVALID/VLOCK VSYNC HSYNC FIELD FRAME0 FRAME1/CSYNC LumaProcessing
&
VCO Controller
&
Sync-Separatio n
&
Registers
AGC Info. EXTCLP
&
Closed Caption VBID Extraction
Y
AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 SYNC1 SYNC2 SYNC3 FBCAP1 FBCAP2 FBCAP3 CLPCAP1 CLPCAP2 VREF 13.5MHz Analog Multiplexer Clamp PGA Sync Separator
Composite Y
Y/C Separation (2D-3Line or 1D-BPF)
Image Ctrl
(Brightness, Contrast etc.) U
10-bit ADC 10-bit ADC 10-bit ADC
C
C /U
Decimation Filter ChromaProcessing
&
V U
Output Processing (Level Shifter & Rec.656 formatter etc.) with Buffer
D[7:0]
V
ACC DFS
(Chroma PLL) &
V
Image Ctrl
(HUE,Saturation)
Microprocessor I/F
VRPVideo VCOM VRNinVREF AVSS site 1-1. SignalAVDD Path ( Compo signal put ) IRefR2
SELA
SDA
SCL /RESET
PD
DVDD
DVSS
Rev.0
2
2002/01
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ASAHI KASEI
IVCXO CLK CLKINV
[AK8850]
LLPF LLPFC FLPF FLPFC IRefR1 Sync-Separatio n
&
NSTD Phase Error CLOCK Module 27MHz Timing Contorller
&
NSIG CLK27MOUT HALFCLKOUT DVALID/VLOCK VSYNC HSYNC FIELD FRAME0 FRAME1/CSYNC LumaProcessing
&
VCO Controller
&
Registers
AGC Info. EXTCLP
&
Closed Caption VBID Extraction
Composite
AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 SYNC1 SYNC2 SYNC3 FBCAP1 FBCAP2 FBCAP3 CLPCAP1 CLPCAP2 AVDD VREF
Composite
Y/C Separation (2D-3Line or 1D-BPF)
Y
Image Ctrl
(Brightness, Contrast etc.)
Y
Analog Multiplexer Clamp PGA Sync Separator
10-bit ADC
Composite C
Decimation Filter
Output Processing (Level Shifter & Rec.656 formatter etc.) with Buffer
U
D[7:0]
ChromaProcessing
&
ACC DFS 13.5MHz
(Chroma PLL) &
V
Image Ctrl
(HUE,Saturation)
Microprocessor I/F
1-2. Signal Path ( YC signal input )
AVSS VRP VCOM VRN VREF IRefR2
SELA
SDA
SCL /RESET
PD
DVDD
DVSS
Rev.0
3
2002/01
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ASAHI KASEI
IVCXO CLK CLKINV
[AK8850]
LLPF LLPFC FLPF FLPFC IRefR1 Sync-Separatio n
&
NSTD Phase Error CLOCK Module 27MHz Timing Contorller
&
NSIG CLK27MOUT HALFCLKOUT DVALID/VLOCK VSYNC HSYNC FIELD FRAME0 FRAME1/CSYNC
Y
VCO Controller
&
Registers
AGC Info. EXTCLP
&
Closed Caption VBID Extraction
LumaProcessing
& Y
AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 SYNC1 SYNC2 SYNC3 FBCAP1 FBCAP2 FBCAP3 CLPCAP1 CLPCAP2 VREF 13.5MHz
C Y
Image Ctrl 10-bit ADC 10-bit ADC
(Brightness, Contrast etc.) Y
Analog Multiplexer Clamp PGA Sync Separator
C
C
Decimation Filter ChromaProcessing
& U
Output Processing (Level Shifter & Rec.656 formatter etc.) with Buffer
D[7:0]
ACC DFS
(Chroma PLL) &
V
Image Ctrl
(HUE,Saturation)
Microprocessor I/F
1-3. Signal Path ( Component signal input ) VCOM VRN VREF IRefR2 AVDD AVSS VRP
IVCXO CLK
SELA
SDA
SCL /RESET
PD
DVDD
DVSS
CLKINV
Rev.0
LLPF FLPFC CLOCK Phase Error
4
2002/01
NSTD NSIG CLK27MOUT HALFCLKOUT
Timing Contorller
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ASAHI KASEI
[AK8850]
Rev.0
5
2002/01
ASAHI KASEI 2. Pin Assignment www.DataSheet4U.com
[AK8850]
VREFOUT
CLPCAP1 CLPCAP2
EXTCLP
FBCAP1
FBCAP2
FBCAP3
IRefR1 IVCXO
FLPF LLPFC
VCOM
FLPFC
IRefR2
AVDD
AVDD AVSS
DVDD
AVSS
AVSS
AIN1 AVSS SYNC1 AVSS AIN2 AVSS SYNC2 AVSS AIN3 AVSS SYNC3 AVSS AVDD AVSS AVSS AIN4 AVSS AIN5 AVSS AIN6 AVSS TEST PD TEST TEST
76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
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 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 .