YDA142 Datasheet, PDF (8/18 Pages) YAMAHA CORPORATION – D- 3D DIGITAL INPUT STEREO 9.5W DIGITAL AUDIO POWER AMPLIFIER

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çççYDA142
●Analog Signal Output
When SLEEPN terminal is “H”, L channel and R channel analog signals are output from LINEOUTL terminal and
LINEOUTR terminal respectively, with an output gain designated by GAIN[2:0] terminal or GAINA terminal with respect
to an input digital signal.
The DC component is superimposed and output from LINEOUTL and LINEOUTR terminal. Therefore, the DC component
is removed with the DC cut capacitor.
●Digital Amplifier Output
When SLEEPN terminal is “H” and MUTEN terminal is “H”, L channel signal is output between OUTPL terminal and
OUTML terminal, with an output gain designated by GAIN[2:0] terminal or GAINA terminal with respect to an input
digital signal. In addition, R channel signal is output between OUTPR terminal and OUTMR terminal. OUTPL and OUTPR
terminal become a positive terminal, and OUTML and OUTMR terminals become a minus terminal, respectively.
LC Filter
YDA142 can be directly connected to a speaker without a LC filter because it adopts a modulation method capable of
reducing speaker loss during no sound sufficiently by utilizing only inductance a speaker has. When a LC filter is not used,
use a speaker with inductance of 20µH or over at a carrier clock frequency of 500kHz.
Use the following filter circuit when a LC filter is connected. At this time, use the following constants in accordance with
speaker's impedance. Using these constants can make a low-pass filter with a cut-off frequency of 50kHz, Q=0.7 or so.
The over current protection function might work by LC resonance when the LC filter is connected and uses, and operate IC
without connecting the speaker.
LC Filter constants
RL
L1
4Ω
10µH
8Ω
22µH
16Ω
47µH
C1
1.0µF
0.47µF
0.22µF
●Control Function
Sleep Function
When SLEEPN terminal is “L”, YDA142 enters Sleep Mode.
The mode stops all the circuit functions including 5V Regulator and minimizes consumption current. At this time, the
output stage of the digital amplifier is disabled and LINEOUTL and LINEOUTR terminals get undefined. And, PROTN
terminal becomes “High-Z”.
Mute Function
When MUTEN terminal is “L”, YDA142 enters Mute Mode.
In this mode, the output stage of the digital amplifier is disabled and LINEOUTL and LINEOUTR terminals output audio
signals normally.
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