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参数资料
| 型号： | C1851BCU |
| 厂商： | NEC Corp. |
| 英文描述： | I2C BUS-COMPATIBLE US MTS PROCESSING LSI |
| 中文描述： | I2C总线兼容美国的多边贸易体制处理LSI |
| 文件页数： | 25/60页 |
| 文件大小： | 447K |
| 代理商： | C1851BCU |
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31
PC1851B
Data Sheet S13417EJ2V0DS00
4.3 Explanation of Write Register
(1) Stereo/SAP output stop function during noise detection
Stereo/SAP output stop can be selected with the data of bit D6 of subaddress 00H during weak electrical field
conditions (recommended noise level during circuit use is 34 mVrms (TYP.) or more).
SAP output stop
: Only SAP output is stopped.
SAP and stereo output stop
: SAP and stereo outputs are stopped, switch to monaural output.
Noise level detection is performed, when detected a noise about at 11.5 fH (180 kHz), a frequency that is sufficiently
apart from that of the high frequency signals such as the stereo, SAP, and telemetry signal. If noise is detected, “1”
is set to bit D4 of the read register (Refer to section 4.4, (4) Noise detection)
Figure 4-1.
Stereo/SAP Output Stop Function During Noise Detection
(2) Mute
The mute function can be set ON/OFF with the data of bit D0 of subaddress 06H.
The mute on state is entered when bit D0 is set to 0 after power-on reset.
Figure 4-2.
Mute
Caution
When switching the power ON/OFF, use the external mute (200 ms) in order to minimize shock
noise.
D7
D6
D5
D4
D3
D2
D1
D0
0
1
0
00H
During noise
detection
Input level setting
Stereo/SAP output stop function during noise detection
SAP output stop
SAP and stereo output stop
D7
D6
D5
D4
D3
D2
D1
D0
Automatic
increment
06H
0
1
Input select 1
Input select 2
SAP1/SAP2
switch
Stereo/SAP
switch
Forced monaural
ON/OFF
Mute
ON/OFF
Mute ON
Mute OFF
Mute
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