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参数资料
| 型号： | YDA147 |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封装： | LEAD FREE, PLASTIC, SQFP-48 |
| 文件页数： | 3/36页 |
| 文件大小： | 1264K |
| 代理商： | YDA147 |
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YDA147
CATALOG No.:LSI-4DA147A61
11
·Non-clip/DRC Function
This is the function to change the gain by detecting an input level to the PWM amplifier and to raise an average output
level while suppressing clipping.
A mode is determined by the combination of NCDRC[1:0] terminals, as shown below.
NCDRC1
NCDRC0
Mode
L
Non-clip & DRC mode OFF
L
H
Non-clip mode
H
L
DRC1 mode
H
DRC2 mode
In Non-clip mode, the gain increases by 12dB. The gain is automatically adjusted so that an output peak voltage becomes
a power limit value. The maximum attenuation is -12dB. Attack Time is 0 second. The release time from -12dB to 0dB is
7.7 s (typ.).
In DRC1 mode, the gain increases by 12dB. Dynamic Range Compression (a half of gain in dB) is performed within an
output range of -12dB (-24dB for input range) from the power limit value. Attack Time is 0 s. The release time from
-12dB to 0dB is 3.9 s (typ.).
In DRC2 mode, the gain increases by 12dB. As with DRC1, similar compression is performed, but power-limit operation
is not performed. PLIMIT terminal can be used to set a DRC operating point. Therefore, the setting of a gain curve is
possible regardless of the maximum output power, and this allows for DRC operation from a low output power.
NCDRC [1:0] terminal should be switched under either of the following conditions.
·
Before PVDD power-on (lower than the PVDD start-up threshold voltage (VHUVLH))
·
SLEEPN=L
Pop noise may occur when switching it under an operating condition other than the above.
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