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LM4861 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM4861
Description  1.1W Audio Power Amplifier with Shutdown Mode
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4861 Datasheet(HTML) 4 Page - National Semiconductor (TI)

  LM4861 Datasheet HTML 1Page - National Semiconductor (TI) LM4861 Datasheet HTML 2Page - National Semiconductor (TI) LM4861 Datasheet HTML 3Page - National Semiconductor (TI) LM4861 Datasheet HTML 4Page - National Semiconductor (TI) LM4861 Datasheet HTML 5Page - National Semiconductor (TI) LM4861 Datasheet HTML 6Page - National Semiconductor (TI) LM4861 Datasheet HTML 7Page - National Semiconductor (TI) LM4861 Datasheet HTML 8Page - National Semiconductor (TI)  
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External Components Description (Figures 1, 2)
Components
Functional Description
1. R
i
Inverting input resistance which sets the closed-loop gain in conjunction with R
f. This resistor also forms a
high pass filter with C
i at fC = 1/(2π Ri Ci).
2. C
i
Input coupling capacitor which blocks DC voltage at the amplifier’s input terminals. Also creates a highpass
filter with R
i at fC = 1/(2π Ri Ci).
3. R
f
Feedback resistance which sets closed-loop gain in conjunction with R
i.
4. C
S
Supply bypass capacitor which provides power supply filtering. Refer to the Application Information
section for proper placement and selection of supply bypass capacitor.
5. C
B
Bypass pin capacitor which provides half supply filtering. Refer to the Application Information section for
proper placement and selection of bypass capacitor.
6. C
f (Note 9)
C
f in conjunction with Rf creates a low-pass filter which bandwidth limits the amplifier and prevents possible
high frequency oscillation bursts.
f
C = 1/(2π Rf Cf)
Note 9: Optional component dependent upon specific design requirements. Refer to the Application Information section for more information.
Typical Performance Characteristics
THD+N vs Frequency
DS011986-5
THD+N vs Frequency
DS011986-6
THD+N vs Frequency
DS011986-7
THD+N vs Output Power
DS011986-8
THD+N vs Output Power
DS011986-9
THD+N vs Output Power
DS011986-10
www.national.com
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