LM48413TL NSC [National Semiconductor], LM48413TL Datasheet - Page 12

• Manufacturer Part Number: LM48413TL
• Description: Ultra Low EMI, Filterless, 1.2W Stereo Class D Audio Power Amplifier with E2S and National 3D Enhancement
• Manufacturer: NSC [National Semiconductor]

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AUDIO AMPLIFIER GAIN
The LM48413 has a fix gain value 24dB which is suitable for
ordinary audio applications. To reduce the amplifier gain, in-
sert two pairs of external input resistors with same value
before the IC’s input signal pins. Figure 3 show the configu-
ration of these input resistors and the amplifier’s internal gain
setting. Accordingly, the overall amplifier gain is given by
Equation 3:
FIGURE 3. Audio Amplifier Gain Setting
12
For example, if the gain to be set is 12dB, then A
4. Thus, Equation (3) the input resistors' value R
160k)/4] –20k = 60kΩ.
A
V
= 2 * (160k) / (20k + R
IN
)
30063528
V
is equal to
IN
= [(2 *
(3)