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參數(shù)資料
| 型號： | TB1254N |
| 廠商： | Toshiba Corporation |
| 英文描述： | PAL / NTSC / SECAM 1CHIP (IF+VCD PROCESSOR) IC |
| 中文描述： | PAL / NTSC制式/ SECAM制式1CHIP（中頻光碟處理器）芯片 |
| 文件頁數(shù)： | 14/58頁 |
| 文件大?。?/td> | 551K |
| 代理商： | TB1254N |
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Ver3.7
00/01/28
14
IIC BUS CONROL FUNCTION
WRITE MODE
PIF STAGE
ITEMS
RF AGC
Sub; 0E h
BITS
6
DESCRIPTIONS
RF AGC delay point (Pin6-7)
01: 65 dB(
V)
00: IF MUTE Stops Demodulation
Setting IF frequency for digital AFT count down
000: 58.75 MHz
010: 39.5 MHz
100: 38.0 MHz
110: 33.95 MHz
AFT Mute Switch
0: normal
AFT sensitivity
0: 100kHz/v
on/off the over modulation switch
0: off
Q detector gain
0: high
1: low
L SECAM
0: Not L-SECAM
1: L-SECAM
turn the polarity for TV Det Out
for positive modulation
Delay the AGC time constant (Peek AGC)
SIF AM demodulation
Speed up the AGC sense for channel serch
0: normal
1: speed-up
Ch Serch
VCO center SW
0: normal
1: Center
In adjusting a tank coil, set this bit to 1.
VCO adjust trigger
0: normal
1: VCO adjust trigger
The PIF VCO starts adjusting after requested.
While adjusting, the picture is blanked
Stop the readjustment on detecting the loosing adjustment
0: normal
1: stop self adjustment
“VCO Adj request” prier it
PRESET
00000
:Mute
3F: 100 dB(
V)
IF Freq.
Sub; 0A h
3
001: 45.75 MHz
011: 38.9 MHz
101: 34.47 MHz
111: 34.2 MHz
000
:58.75MHz
AFT Mute
Sub; 0D h
AFT sens.
Sub; 0D h
Over mod SW
Sub; 0D h
Q det. Gain
Sub; 0D h
L-SECAM Mode
Sub; 09 h
1
1: AFT defeat (mute)
0:normal
1
1: 25kHz/V
0:100kHz
1
1: on
0:off
0:high
1
0:Not
L-SECAM
L-SECAM
Speed
Sub; 09 h
VCO Center
Sub; 0C h
AGC
1
0:normal
1
0: normal
VCO Adj. Request
Sub; 0C h
1
0: normal
VCO Adj. Stop
Sub; 0C h
1
0: normal
SIF STAGE
ITEMS
SIF Freq.
Sub; 0A h
BITS
2
DESCRIPTIONS
SIF Frequency
00: 5.5MHz
10: 6.5MHz
Set the SIF frequency for;
Select the SIF FM demodulator band
select the de-emphasis speed
Set the ref.freq. for single
MHz beet up if using
Set the SIF freq. to 5.74MHz for IGR Bilingual.
It sets the reference freq. for beet up the 5.74MHz to 6.5MHz.
0: other frequencies
PRESET
00:5.5MHz
01: 6.0MHz
11: 4.5MHz
SIF 574
Sub; 0C h
1
1: 5.74MHz
0:other
frequencies
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