LM48413

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SNAS460B – NOVEMBER 2008 – REVISED MARCH 2013

Figure 17. Single-Ended Circuit Diagram

AUDIO AMPLIFIER GAIN

The LM48413 has a fix gain value 24dB which is suitable for ordinary audio applications. To reduce the amplifier

gain, insert two pairs of external input resistors with same value before the IC’s input signal pins. Figure 18 show

the configuration of these input resistors and the amplifier’s internal gain setting. Accordingly, the overall amplifier

gain is given by Equation 3:

AV = 2 * (160k) / (20k + RIN )

(3)

For example, if the gain to be set is 12dB, then AV is equal to 4. Thus, Equation 3 the input resistors' value RIN =

[(2 * 160k)/4] –20k = 60k

Ω.

Figure 18. Audio Amplifier Gain Setting

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