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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： | 9/36页 |
| 文件大小： | 1264K |
| 代理商： | YDA147 |
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YDA147
CATALOG No.:LSI-4DA147A61
17
● Regulator Output
When SLEEPN terminal is at H, YDA147 outputs VDDA to AVDD terminal. Connect a capacitor of 1F to 4.7F to
AVDD terminal for stabilization. (0.8F or more should be secured including its variation and temperature change.)
AVDD output must be used only for YDA147. If this output is used in a peripheral circuit of YDA147, the maximum
current that can be driven will be IDDA.
●LC Filter
YDA147 adopts the modulation method that reduces speaker loss sufficiently at mute state by the use of only an inductance
the speaker has, and this allows for direct connection to a speaker without an LC filter.
When an LC filter is used, use the LC filter circuits shown below. At this time, the following constant should be used
according to an impedance of a speaker. Using these constants makes a low-pass filter with a cut-off frequency of 50kHz or
so, Q=0.7 or so.
LC filter constants:
RL
L1
C1
C2
4Ω
10μH
0.33μF
0.22μF
8Ω
22μH
0.22μF
0.1μF
C1
C2
RL
L1
C1
C2
RL
L1
LC Filter circuit (Stereo)
LC Filter circuit (Monaural)
*
With use of LC filters, if there is a possibility of not using a speaker, audio signals within 20kHz should be input.
And, if its band limitation is not possible, remove the speaker under the following conditions: SLEEPN terminal = L or
MUTEN terminal = L, or PVDD = Power Off.
●Speaker Inductance
In the following cases, use a speaker with an inductance of 20H or more (at around the switching frequency (fCKIN or fCK)).
1. Direct connection of a speaker to an output pin of the digital amplifier without an LC filter.
2. Connection of a speaker to a position after components for EMI measures such as ferrite beads etc. (filterless).
With an inductance of less than 20H, power loss in the speaker and this device may increase.
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