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參數(shù)資料
| 型號： | C1851BCU |
| 廠商： | NEC Corp. |
| 英文描述： | I2C BUS-COMPATIBLE US MTS PROCESSING LSI |
| 中文描述： | I2C總線兼容美國的多邊貿(mào)易體制處理LSI |
| 文件頁數(shù)： | 22/60頁 |
| 文件大?。?/td> | 447K |
| 代理商： | C1851BCU |
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29
PC1851B
Data Sheet S13417EJ2V0DS00
4.2 Setting Procedure
Precise adjustment of the dbx decoder is absolutely critical for optimum performance. Where possible, the adjustment
should be performed after the
PC1851B is mounted on the chassis and with the video system active.
Set the data of write register as follows before the adjustment.
Table 4-1.
Default Setting of Write Register
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Subaddress
00H
0
1
0
01H
0
1
0
02H
0
1
03H
0
1
0
04H
0
1
0
05H
0
1
0
06H
0
1
07H
0
1
08H
0
1
0
09H
0
1
0
0AH
0
1
0
(1) Input level setting (Write register, subaddress 00H, bits D5 to D0)
<1> Write “1” to bit D0 (Mute: OFF) of subaddress 06H.
<2> Input sine wave of 300 Hz, 150 mVrms to COM pin.
<3> Set bits D5 to D0 (INPUT LEVEL SETTING bits) of subaddress 00H so that the output level of FOR pin is
500 mVrms (
±10 mVrms).
(2) Stereo VCO setting (Write register, subaddress 01H, bits D6 to D0)
Perform this adjustment with no signal applied.
<1> Write “1” to bit D0 (Mute: OFF) of subaddress 06H.
<2> Write “1” to bit D6 (fH monitor: ON) of subaddress 01H.
<3> Connect frequency counter to FOR pin, and set bits D5 to D0 (STEREO VCO SETTING bits) of subaddress
01H so that frequency counter displays 15.73 kHz (
±0.1 kHz).
<4> When setting is completed, write “0” to bit D6 (fH monitor: OFF) of subaddress 01H.
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