lm48413tlx National Semiconductor Corporation, lm48413tlx Datasheet - Page 11

• Manufacturer Part Number: lm48413tlx
• Description: Ultra Low Emi, Filterless, 1.2w Stereo Class D Audio Power Amplifier With E2s And National 3d Enhancement
• Manufacturer: National Semiconductor Corporation

The 3D RC network acts as a high-pass filter. The amount of
the 3D effect is set by the R
of R3D increases the 3D effect. The C
frequency at which the 3D effect occurs. Increasing the value
of C
the 3D effect over a wider bandwidth. The low frequency cut-
off point is given by Equation 2:
Enabling the 3D effect increase the gain by a factor of (1
+40kΩ/R
3D
decreases the low frequency cutoff point, extending
3D
f
3D(–3dB)
). Setting R
= 1 / 2
3D
π
to 40kΩ results in a gain increase of
(R
3D
3D
resistor. Decreasing the value
)(C
3D
)
3D
(Hz)
capacitor sets the
FIGURE 2. Single-Ended Circuit Diagram
(2)
11
6dB whenever the 3D effect is enabled. The Equation (2)
holds for both differential and single-end configuration. The
recommended tolerance of the resistor value and capacitor
value of the two RC networks are 5% and 10% respectively.
Tolerance out of this range may affect the 3D gain and low
frequency cut-off point too much. The desired sound quality
of the 3D effect may not be obtained consequently.
SINGLE-ENDED AUDIO AMPLIFIER CONFIGURATION
The LM48413 is compatible with single-ended sources. When
configured for single-ended inputs, input capacitors must be
used to block and DC component at the input of the device.
Figure 2 shows the typical single-ended applications circuit.
30063525
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