YMF795 Datasheet, PDF (34/45 Pages) YAMAHA CORPORATION – APL-2 Automobile sound Player-2

YMF795
Example of the recommended level adjustment in all the system
Turn down either FM or SP volume a little as a default (-3 dB to -6 dB or so).
This is made for previously assuring a volume of which Gain is increased, because either volume may be controlled
by user
EQ amplifier Gain of 3 times to 4 times or so is recommended to secure the output level to some extent in
monophonic sound. (For example, R1=22 kΩ, R2=82 kΩ).
When monophonic sound is generated in this condition (FM volume as 0dB), EQ1 is 0.4125 Vp-p, and if Gain of
the EQ amplifier is four times, EQ3 becomes 1.65 Vp-p.
When -4 dB is given by SPVOL, voltage between SPOUT1 and 2 becomes 3.96 Vp-p, and resultantly 245 mW
output power can be obtained with the speaker (RL=8Ω).
A level adjustment of 4-sound simultaneous generation
When normal music is played back, the amplitude of DAC seldom swings to 1.65 Vp-p.
Therefore, the same Gain settings as that of monophonic sound can be made but if distortion of its sound is a little
significant, turn down the Gain of EQ amplifier or adjust the FM and/or SP volume.
A level adjustment of HPOUT
Adjust the GAIN outside the LSI to increase Gain of the HPOUT side.
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