YDA144

5

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Description of operating functions

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Digital Amplifier Function

Distortion of PWM pulse output signal and noise of the signal is reduced by adopting “Pure Pulse Direct Speaker Drive

Circuit”

In addition, YDA144 has been designed so that high-efficiency can be maintained within an average power range (100mW

or so) that is used for mobile terminal.

First Stage Amplifier Gain Setting Function

G0 terminal can set the Gain of YDA144. When Non-Clip function is disabled, the relation between G0 terminal setting and

Gain is as follows.

Digital Amplifier Gain Setting

G0

Gain

L

12dB

44kΩ

H

18dB

28kΩ

Note） H and L indicates logic High and logic Low, respectively.

＜Differential input＞

＜Single input＞

In addition, positive (+) and negative (-) sides of differential input pins (INL+ and INL-, or INR+ and INR-), input pins of

the unused channel side, should be connected to each other and connected to AVSS through a capacitor.

Use a capacitor with the same capacitance (0.1µF) as that of a DC-cut capacitor in the channel side being used.

＜Input terminal processing of unused channel side＞

should be 0.1µF or less.