C1851BCU NEC, C1851BCU Datasheet - Page 29

• Manufacturer Part Number: C1851BCU
• Description: Search ---> UPC1851BCU
• Manufacturer: NEC

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4.2 Setting Procedure
should be performed after the PC1851B is mounted on the chassis and with the video system active.
(1) Input level setting (Write register, subaddress 00H, bits D5 to D0)
(2) Stereo VCO setting (Write register, subaddress 01H, bits D6 to D0)
Precise adjustment of the dbx decoder is absolutely critical for optimum performance. Where possible, the adjustment
Set the data of write register as follows before the adjustment.
<1> Write “1” to bit D0 (Mute: OFF) of subaddress 06H.
<2> Input sine wave of 300 Hz, 150 mV
<3> Set bits D5 to D0 (INPUT LEVEL SETTING bits) of subaddress 00H so that the output level of FOR pin is
<1> Write “1” to bit D0 (Mute: OFF) of subaddress 06H.
<2> Write “1” to bit D6 (f
<3> Connect frequency counter to FOR pin, and set bits D5 to D0 (STEREO VCO SETTING bits) of subaddress
<4> When setting is completed, write “0” to bit D6 (f
Perform this adjustment with no signal applied.
500 mV
01H so that frequency counter displays 15.73 kHz ( 0.1 kHz).
rms
( 10 mV
Subaddress
H
rms
monitor: ON) of subaddress 01H.
0AH
).
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
Table 4-1. Default Setting of Write Register
Bit
D7
0
0
0
0
0
0
0
0
0
0
0
rms
Data Sheet S13417EJ2V0DS00
to COM pin.
D6
0
0
0
0
0
0
0
1
1
1
1
D5
1
1
1
1
1
1
0
1
1
1
1
H
monitor: OFF) of subaddress 01H.
D4
0
0
1
0
0
0
0
1
0
0
0
D3
0
0
1
0
0
0
0
1
0
0
0
D2
0
0
1
0
0
0
0
1
0
0
0
D1
0
0
1
0
0
0
0
1
0
0
0
D0
0
0
1
0
0
0
1
1
0
0
0
PC1851B
29