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參數(shù)資料
| 型號： | UPC1851BCU |
| 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)： | 29/60頁 |
| 文件大小： | 447K |
| 代理商： | UPC1851BCU |
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29
μ
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
μ
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
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
0
0
1
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
1
0
0
0
1
1
0
0
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 mV
rms
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 mV
rms
(
±
10 mV
rms
).
(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 (f
H
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 (f
H
monitor: OFF) of subaddress 01H.
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