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参数资料
| 型号： | YMU757B-QZ |
| 元件分类： | 音频合成 |
| 英文描述： | TONE/MUSIC SYNTHESIZER, PQCC20 |
| 封装： | LEAD FREE, QFN-20 |
| 文件页数： | 24/43页 |
| 文件大小： | 990K |
| 代理商： | YMU757B-QZ |
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YMU757B
-30-
One sound and volume level adjustment in 4 sound pronunciation
The volume level outputted from DAC by the number of the pronunciation is different.
When 1 sound (*) is outputted from FM sound source, output voltage amplitude from DAC is 0.375Vp-p.
When more than one sound is pronounced at the same time, output voltage amplitude varies in the phase of each
wave shape.
But, when the wave shape of the same phase piles up, it becomes 0.75Vp-p by 2 sound, 1.125Vp-p by 3 sound,
1.5Vp-p by 4 sound.
(*: The volume adjustment (Total Level of Carrier) of 1 sound is being explained with the premise of 0dB.)
An assumption in 300m W output.
Output power from the speaker is 300mW when RL is 8 and a voltage between SPOUT1 and 2 is 1.55Vrms.
BTL output amplitude at this time becomes 1.55×2×1.414=4.38Vpp, and becomes 4.38/3.8=1.15Vpp with the
EQ3 terminal.
(Gain with the speaker amplifier is +11.6dB= 3.8 times.)
Securing a volume level by one sound.
Gain adjustment in the part EQ amplifier is recommended as the way of securing a volume level by one sound.
Gain depends on the resistance ratio of R1 and R2, and it is GAIN=R2/R1.
Gain to recommend is about four times from three times.
+ -
DAC
R1
VREF
FM
VOL
HP
VOL
HPOUT
EQ1
EQ2
EQ3
R2
SP
VOL
BTL Driver
+11.6dB
SPOUT1
SPOUT2
RL=8
FM sound
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