參數(shù)資料
型號(hào)： AK8850
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： NTSC Digital Video Decoder
中文描述： NTSC制式數(shù)字視頻解碼器
文件頁數(shù)： 40/99頁
文件大?。?/td> 1757K
代理商： AK8850
ASAHI KASEI
[AK8850]
* Non-Sensing Bandwidth of the Pedestal Clamp is set as follows.
[DPCC1:DPCC0]
286mV SYNC
Pedestal Level 240
300mV Sync
Pedestal Level 252
00
Default
Pedestal level is not 240, digital pedestal
clamp function works.
Pedestal level is not 252, digital pedestal
clamp function works.
01
Non-Sensing Bandwidth : +/- 1LSB
Pedestal Level is not in the range of 238 -
241, digital pedestal clamp function works
Non-Sensing Bandwidth : +/- 1LSB
Pedestal Level is not in the range of 250 -
253, digital pedestal clamp function works
10
Non-Sensing Bandwidth : +/- 2LSB
Pedestal Level is not in the range of 236 -
243, digital pedestal clamp function works
Non-Sensing Bandwidth : +/- 2LSB
Pedestal Level is not in the range of 248 -
255, digital pedestal clamp function works
11
Non-Sensing Bandwidth : +/- 3LSB
Pedestal Level is not in the range of 232 -
247, digital pedestal clamp function works
Non-Sensing Bandwidth : +/- 3LSB
Pedestal Level is not in the range of 244 -
259, digital pedestal clamp function works
7-4-4 AGC ( Automatic Gain Control )
This function sets the PGA gain so that input level is properly set. The PGA gain is calculated so that the SYNC level is
equal to 40 IRE / 300 mV ( 286 mV-type Sync / 300 mV-type Sync ) and its value is set to PGA ( classification of 286
mV-type Sync and 300 mV-type Sync is listed in Table 7-2-1-1 ).
Gain-calculation and Gain-set are performed during the VBI interval of each Field.
The AGC time constant is programmable in 3 steps using the [ CONTROL 1 REGISTER ]. The PGA gain is derived from
the SYNC level information only.
AGC is performed only on the Composite signal and the Y portion of the YC input and Component input signals. Auto
gain is not performanced on the C-signal or Pb / Pr signals.
It is assumed that correction of the C-signal is done using the ACC of the digital portion. Correction of the Component Pb
/Pr signals should be manually done using the Color Saturation Control function.
When the AGC function is disabled by the [ CONTROL 1 REGISTER ], the gain of each channel can be manually set via
the [ PGA1 / PGA 2 / PGA 3 GAIN CONTROL REGISTER ].
AGC Control Register Description:
AGC is controlled by the [ CONTROL 1 REGISTER ].
* [ CONTROL 1 REGISTER ]
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
FRCSYNC
Reserved
INTPOL[1]
INTPOL[0]
AGCC1
AGCC0
AGCT1
AGCT0
Default Value
1
0
AGC set is defined as follows.
Enable / Disable and the Time-Constant ( T ) of the AGC are set .
[AGCT1:AGCT0](bit-1:bit-0)
AGC Function
[0,0]
Disable (Default)
[0,1]
T=1Field
[1,0]
T=7Field
[1,1]
T=29Field
The AK8850 sets the PGA value so that the SYNC-TIP level is equal to 40 IRE / 300 mV ( 286 mV-type Sync / 300
mV-type Sync ) while the AGC is enabled.
The 286 mV-type Sync here means NTSC Composite, NTSC YC input and Betacam Component signals, while the 300
mV-type Sync means 625 Component and MII Component signals.
40 IRE / 300 mV ( 286 mV-type Sync / 300 mV-type Sync ) are equivalent to 240 / 252 ( 10-bit ) in digital code. As the
SYNC-TIP is set to 16 ( 10-bit ), Sync sizes are equivalent to 224 / 236 ( 10-bit ) respectively.
Sampled Digital Code
Sync level
286mV SYNC
240
224
300mV SYNC
252
236
While the AGC is enabled, manual gain adjustment is not possible by the PGA1 / PGA2 / PGA3 GAIN CONTROL
Registers ( AGC has higher priority than manual gain adjustments ).
Rev.0
45
2003/01
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