ASAHI KASEI
[AK8851]
MS0244-E-03
1
2005 / 07
Confidential
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.
ASAHI KASEI
[AK8851]
MS0244-E-03
2
2005/07
Confidential
1.Functional Block Diagram
Analog Process
- Analog Multiplexer
- Clamp
- PGA
VREF
Timing
Contorller
&
VCO Controller
CLOCK
Module
AIN1
AIN2
AIN3
AIN4
AVDD AVSS
VRN
VRP VCOM
SELA
SDA
SCL
/RESET
- Demodulation
- ACC
- HUE Ctrl
- Saturation Ctrl
DFS
&
Chroma PLL
D[7:0]
CLK
HALFCKO
/DVALID
VSYNC
HSYNC
CSYNC
FIELD
DVSS
DVDD
EXTCLP
IRefR1
10-bit
ADC
C
Y
C
U
V
CLK27MO
Microprocessor I/F
Register
NSIG
Phase Error
27MHz
13.5MHz
VREF
/PD
CLPCA P1
CLPCA P2
IRefR2
Output Processing
- Pixel Interpolator
- VBI Slicer
- Rec.656 formatter
- 656 Output Buffer
C
Chroma- Processing
Y
Luma- Processing
- Brightness Ctrl
- Contrast Ctrl
- Sharpness Ctrl
Decimation
Filter
- Sync-Separation
- AGC Info.
- Closed Caption
- VBID,WSS
- WSS
Y/C
Separation
2D-3Line
or
1D-BPF
Y
EXTDAT[7:0]
TEST
AIN5
AIN6
10-bit
ADC
Y
CVBS
ASAHI KASEI
[AK8851]
MS0244-E-03
3
2005 / 07
Confidential
2. Pin Assignment
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
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
33
32
31
30
29
28
27
26
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
DVSS
CLKINV
/RESET
/PD
EXTCLP
AVSS
AVDD
AVSS
AVSS
AVSS
VFEFOUT
AVSS
AVSS
AVDD
IREFR1
IFEFR2
AVSS
AVSS
AVDD
CLPCAP1
AIN1
AVSS
AIN2
AVSS
AIN3
VR
P
VR
N
VC
O
M
AV
SS
AV
DD
AV
SS
AIN
4
CLPCA
P
2
AIN
5
AV
SS
AIN
6
AV
SS
AV
SS
DVS
S
DV
DD
NS
I
G
DV
ALI
D
FI
E
L
D
CSY
N
C
DVS
S
DV
DD
DV
DD
DVS
S
HSY
N
C
VS
YN
C
NC
SCL
SE
L
A
D
VSS
D
V
DD
D
VSS
DV
SS
NC
NC
D
V
DD
D
VSS
D
VSS
D
V
DD
CLK
27MO
HA
L
F
C
K
O
D
V
DD
D
VSS
EX
TD
AT
7
EX
TD
AT
6
D
V
DD
D
VSS
DVS
S
SDA
D
V
DD
CL
K
I
N
EXTDAT5
EXTDAT4
EXTDAT3
EXTDAT2
DVDD
DVSS
DVSS
DVDD
EXTDAT1
EXTDAT0
D7
DVDD
AVSS
D6
DVDD
DVSS
D4
D3
D2
DVDD
DVSS
D1
D0
DVSS
D5
AK8851
ASAHI KASEI
[AK8851]
MS0244-E-03
4
2005 / 07
Confidential
3. Pin Functional Description
PIN#
Symbol
I/O
Function
1
VRP
O
Internal reference positive Voltage for AD Converter
2
VRN
O
Internal reference negative Voltage for AD Converter
3
VCOM
O
Common voltage for AD Converter
4
AVSS
G
Ground pin for Analog
5
AVDD
P
Analog supply voltage (3.3V)
6 AVSS
G
Ground pin for Analog
7 AIN4
I
Analog Video Signal Input pin.
Input 6dB analog video signal via 0.1uF capacitor.
8 CLPCAP2 O
Capacitor for clamp.
Connect 0.1uF ceramic capacitor between AVSS
9 AIN5
I
Analog Video Signal Input pin.
Input 6dB analog video signal via 0.1uF capacitor.
10
AVSS
G
Ground pin for Analog
11 AIN6
I
Analog Video Signal Input pin.
Input 6dB analog video signal via 0.1uF capacitor.
12
AVSS
G
Ground pin for Analog
13
AVSS
G
Ground pin for Analog
14
DVSS
G
Ground pin for Digital
15
DVDD
P
Digital supply voltage (3.3V)
16 NSIG
O
No-signal indicator.
H: No input video Signal
L: Video Signal Input
17
DVALID
O
Active video data (720pixel) indicator
18
FIELD
O
Timing signal for FIELD
19
CSYNC
O
Timing signal for CSYNC
20
DVSS
G
Ground pin for Digital
21
DVDD
P
Digital supply voltage (3.3V)
22
DVDD
P
Digital supply voltage (3.3V)
23
DVSS
G
Ground pin for Digital
24
HSYNC
O
Timing signal for HSYNC
25
VSYNC
O
Timing signal for VSYNC
26
DVSS
G
Ground pin for Digital
27
D0
O
Decoded Data output pin (LSB)
28
D1
O
Decoded Data output pin
29
DVSS
G
Ground pin for Digital
30
DVDD
P
Digital supply voltage (3.3V)
31
D2
O
Decoded Data output pin
32
D3
O
Decoded Data output pin
33
D4
O
Decoded Data output pin
34
D5
O
Decoded Data output pin
35
DVSS
G
Ground pin for Digital
36
DVDD
P
Digital supply voltage (3.3V)
37
D6
O
Decoded Data output pin
38
D7
O
Decoded Data output pin (MSB)
39
AVSS
G
Ground pin for Analog
40
DVDD
P
Digital supply voltage (3.3V)
41 EXTDAT0
O
Cb/Cr data output pin for 16-bit output mode (LSB)
Open this pin for 8-bit output mode
42 EXTDAT1
O
Cb/Cr data output pin for 16-bit output mode
Open this pin for 8-bit output mode
43
DVDD
P
Digital supply voltage (3.3V)
44
DVSS
G
Ground pin for Digital
45
DVSS
G
Ground pin for Digital
46
DVDD
P
Digital supply voltage (3.3V)
47 EXTDAT2
O
48 EXTDAT3
O
49 EXTDAT4
O
50 EXTDAT5
O
Cb/Cr data output pin for 16-bit output mode
Open this pin for 8-bit output mode
51
DVSS
G
Ground pin for Digital
52
DVSS
G
Ground pin for Digital
53
DVDD
P
Digital supply voltage (3.3V)
54 EXTDAT6
O
Cb/Cr data output pin for 16-bit output mode
Open this pin for 8-bit output mode
55 EXTDAT7
O
Cb/Cr data output pin for 16-bit output mode (MSB)
Open this pin for 8-bit output mode
ASAHI KASEI
[AK8851]
MS0244-E-03
5
2005 / 07
Confidential
56
DVSS
G
Ground pin for Digital
57
DVDD
P
Digital supply voltage (3.3V)
58 HALFCKO O
Indicator for Y Data and Cb/Cr Data in 8-bit output mode
(Indicator transition rate is 13.5MHz)
59
CLK27MO
O
27MHz Clock output
60
DVDD
P
Digital supply voltage (3.3V)
61
DVSS
G
Ground pin for Digital
62
DVSS
G
Ground pin for Digital
63
DVDD
P
Digital supply voltage (3.3V)
64 NC
65 NC
66
DVSS
G
Ground pin for Digital
67
DVSS
G
Ground pin for Digital
68
DVDD
P
Digital supply voltage (3.3V)
69
CLK
I
Clock input pin (24.576MHz)
70
DVDD
P
Digital supply voltage (3.3V)
71
DVSS
G
Ground pin for Digital
72 SDA
I/O
I
2
C bus Data
73 SELA
I
I
2
C bus address select
74 SCL
I
I
2
C bus clock
75 NC
76 DVSS
G
Ground pin for Digital
77
CLKINV
I
CLK27MO output polarization is determined by this pin
78 /RESET
I
Reset signal input pin (Low Active)
Reset sequence needs 24.576MHz Clock
79 /PD
I
Power down control pin.
L: Power down
H: Active
Reset sequence is necessary when Power Down signal after High
All output pins become Low while Power down pin is Low.
80 EXTCLP
I/O
Monitor pin for internal clamp timing pulse.
External clamp timing pulse can be input on this pin by setting a register
Open this pin when not using
81
AVSS
G
Ground pin for Analog
82
AVDD
P
Analog supply voltage (3.3V)
83
AVSS
G
Ground pin for Analog
84
AVSS
G
Ground pin for Analog
85
AVSS
G
Ground pin for Analog
86
AVSS
G
Ground pin for Analog
87
AVSS
G
Ground pin for Analog
88 VREFOUT O
Internal Vref Output pin
Connect ceramic capacitor (0.1uF -) between Analog Ground
89
AVDD
G
Analog supply voltage (3.3V)
90 IREFR1
O
Connect
12k(1%) Register between Analog ground
91 IREFR2
O
Connect
4.7k(1%) Register between Analog ground
92
AVSS
G
Ground pin for Analog
93
AVSS
G
Ground pin for Analog
94
AVDD
P
Analog supply voltage (3.3V)
95 CLPCAP1
O
Capacitor for clamp.
Connect 0.1uF ceramic capacitor between AVSS
96 AIN1
I
Analog Video Signal Input pin.
Input 6dB analog video signal via 0.1uF capacitor.
97
AVSS
G
Ground pin for Analog
98 AIN2
I
Analog Video Signal Input pin.
Input 6dB analog video signal via 0.1uF capacitor.
99
AVSS
G
Ground pin for Analog
100 AIN3
I
Analog Video Signal Input pin.
Input 6dB analog video signal via 0.1uF capacitor
AVDD
P
Analog supply voltage (3.3V)
AVSS
G
Ground pin for Analog
DVDD
P
Digital supply voltage (3.3V)
DVSS
G
Ground pin for Digital
* Recommendation: Perform a "power on reset" prior to using the device, as applying voltage to the AK8851 cannot ensure
proper device initialization. Only a reset sequence can ensure this.
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