■Outline
The YDA131 is the high efficient digital audio power amplifier IC that operates on a single 5V power supply. This IC is capable of providing output power of 2.5W/channel, which is at the highest level as a device on a single 5V power supply. By adopting Yamaha's proprietary modulation system, the device provides low distortion and high signal to noise ratio at the highest level among digital amplifiers in the equivalent class. This IC accepts analog signal, converts it into digital pulse by the digital modulation circuitry and outputs the signal from the large current capacity buffers. The digital pulse signal that is outputted from the output buffer is converted into audio signal through an external low pass filter, and sent to the speakers.

■Features
・ High output power
   2.5 W @ VDD=5.0V, 4Ω (THD+N<10%)
・ High efficiency operation
   85 % @ VDD=5.0V, RL=8Ω
   75 % @ VDD=5.0V, RL=4Ω
・ Low distortion(THD+N)
0.018 % @ Po=1.0W, 1kHz, RL=4Ω
・ High signal to noise ratio
   103dB @ VDD=5.0V, Input sensitivity =1.0V, RL=4Ω
    97dB @ VDD=5.0V, Input sensitivity=150mV, RL=4Ω
・ Low consumption current
   14.0 mA @ VDD=5.0V, no signal(no filter)
   7.0 mA @ VDD=5.0V, at mute
   1 µA @ VDD=5.0V, at sleep
・ Channel separation
   80dB @ 1kHz
・ Any gain setting by external resistor
・ Any setting of starting time by VREF capacitor
・ Sleep function by SLEEP terminal
・ Output mute function by MUTE terminal
・ Over current detection function of speaker terminal end (Ground short-circuiting, Load short-circuiting)
・ High temperature detection function
・ Pop noise suppression function at turn-on and turn-off
・ Analog input/BTL(Bridge-Tied Load)output
・ 24-pin plastic SSOP
   Pin lead plating with Pd free (YDA13１-EZ)