lm4663 National Semiconductor Corporation, lm4663 Datasheet
lm4663
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lm4663 Summary of contents
Page 1
... The LM4663 also features a stereo headphone amplifier that delivers 80mW into a 32Ω headset with less than 0.5% THD. The LM4663 has two stereo inputs that can be selected to drive either the headphone amplifier or the Class D amplifier. All amplifiers are protected with thermal shutdown. ...
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... 50Ω 1µF, SOURCE 8Hz to 22kHz 200mV, 1kHz 1kHz 100mV 4Ω (Notes 1, 2) ≤ T −40˚C ≤ T ≤ +85˚C A MAX A 4.5V ≤ V ≤ 5.5V DD 80˚C/W 20˚C/W LM4663 Typical Max Min 5 5.5 4 4.5 0.5 4.5 0.5 2.1 0.82 0.49 0. 0.2 200 44 13 215˚ ...
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... 50Ω 1µ 8Hz to 22kHz 200mV, 1kHz 32Ω 1kHz 100mV 32Ω 1kHz 100mV 32Ω Power Dissipation vs Output Power 10126910 3 LM4663 Units Typical Max Min 0 0.15 30 µ 5.5 dB 0.1 dB 10126911 www.national.com % ...
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Typical Performance Characteristics Class D Amplifier In-Band Output Spectrum Class D Amplifier THD + N vs Power vs Frequency www.national.com (Continued) 10126912 THD + N vs Frequency vs Power 10126914 Headphone THD + N vs Frequency vs Power 4 Class ...
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... Class D amps OUTPUT FILTERS The LM4663’s 2W power amplifiers use a Class D switching topology that requires a filter between the amplifier outputs and the load. The balanced, L-C filters shown in Figure 1 use component values recommended for a maximally flat mag- nitude in the pass-band and a cut-off frequency of 18kHz with a load impedance of 4Ω ...
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... The result is increased THD. MINIMUM LOAD RESISTANCE As specified in the Absolute Maximum Ratings, the minimum load resistance supported by the LM4663 at the output of the filters is 2.5 Ohms. Loads (usually loudspeakers) should be tested over the audio band to determine whether or not there are resonant points of diminshed impedance less than this limit ...
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... Class AB and Class D jumpers are open. (Requires the use of a headphone jack like that shown in Figure 1.) FIGURE 2. At power-up, the LP3740 forces the LM4663 into shutdown, which prevents abnormal quiescent current flow through the amplifier. Once V CC FIGURE 3 ...
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... C8,C10,C12,C14 0805 C9,C11,C13,C15 3216 C16-C18 0805 C19-C22 0805 R5a,R6a 0805 R7a 0805 L1-L4 D03316P−223 U1 LM4663MT www.national.com (Continued) FIGURE 6. Recommended PC board layout: Inner 10126907 Layer supply plane layout Type Value Size SMD/Top 1µF SMD/Top 220µF "D" SMD/Top .47µF SMD/Top 2.2µ ...
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... Applications Information (Continued) FIGURE 8. Recommended LM4663 PC Board 9 10126935 www.national.com ...
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Revision History Rev 1.1 www.national.com Date 04/11/06 Revised Connection Diagram 10 Description ...
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... Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 Order Number LM4663MT NS Package Number MTC24 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...