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參數(shù)資料
| 型號(hào)： | TB1274BFG |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | 10 X 14 MM, 0.80 MM PITCH, QFP-48 |
| 文件頁數(shù)： | 11/37頁 |
| 文件大?。?/td> | 839K |
| 代理商： | TB1274BFG |
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TB1274BFG
2005-08-18
19
VERTICAL COUNT-DOWN
In Automatic of V C/D MODE, the vertical synchronization is controlled by internal PLL. In Fast mode, it is
synchronized with the inputted synchronizing signal and the pull-in time is short. Furthermore the time is
shorter in Very fast mode by the expanded pull-in range. Pull-in range of vertical count-down is determined by
the BUS data, V C/D MODE and V-FREQ as Table 8.
Table 8 V C/D pull-in range
Normal 1, 2
Teletext
Fast
V C/D MODE
V FREQ
00, 11
01
10
000
Automatic 1
224-353H
32-353H
001
50Hz
274-353H
32-353H
010
60Hz
224-297H
32-297H
011
Automatic 2
224-353H
32-353H
100
312.5H
Forced 312.5H mode & AFC free-run
101
262.5H
Forced 262.5H mode & AFC free-run
110
313H
Forced 313H mode & AFC free-run
111
263H
Forced 263H mode & AFC free-run
00 ; Normal 1
Normal vertical input mode 1. It is good performance of vertical phase keeping for
standard TV signal sync. And vertical output phase that is detected first time is kept
always. And this mode can detect teletext or VCR skew sync (non-standard sync).
01 ; Teletext
This mode is less performance of vertical phase keeping for standard TV signal sync
against “Normal”.
However, pull-in speed is faster few vertical periods than
“Normal”. Therefore this mode is recommended for tesetext sync.
On the other hand, this mode can detect standard TV signal sync in the state of
stability but it is less performance of vertical phase keeping in week signal as about
–3dB against “Normal”.
10 ; Fast
This mode is same performance of vertical phase keeping for standard TV signal sync
of “Teletext”. But it is faster pull-in speed faster than “Teletext” because pull-in ranges
wider than “Teletext”. (refer to Table 8)
Therefore, this mode is better to use when channel changing, but is not recommended
to use in the state of stability or in week signal due to too wide pull-in range and
incorrect actions of vertical keeping appearing.
11 ; Normal 2
Basic detecting function is same as “Normal 1”. And in “Normal 1” mode, the vertical
output phase that is detected first time is kept, however, in this mode, the vertical
output phase is detected always.
Y-DL ADJUSTMENT
Table 9 shows Y output delays against Y input on condition with BPF=f0, Q=2.0, Y-DL=Min and LPF=ON.
Y-out signal can be delayed by the BUS data, Y-DL. The adjustment time of one step is 40ns.
Table 9 Y delays according to the color system
Color system
Y delay (ns)
PAL
450
NTSC
450
SECAM
650
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