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LM4910 Datasheet(PDF) 15 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM4910
Description  Output Capacitor-less Stereo 35mW Headphone Amplifier
PDF  22 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4910 Datasheet(HTML) 15 Page - National Semiconductor (TI)

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Application Information (Continued)
The LM4910 is unity-gain stable and requires no external
components besides gain-setting resistors, input coupling
capacitors, and proper supply bypassing in the typical appli-
cation. However, if a very large closed-loop differential gain
is required, a feedback capacitor (C
f) may be needed as
shown in Figure 6 to bandwidth limit the amplifier. This
feedback capacitor creates a low pass filter that eliminates
possible high frequency oscillations. Care should be taken
when calculating the -3dB frequency in that an incorrect
combination of R
f and Cf will cause frequency response roll
off before 20kHz. A typical combination of feedback resistor
and capacitor that will not produce audio band high fre-
quency roll off is Rf = 20k
Ω and C
f = 25pF. These compo-
nents result in a -3dB point of approximately 320kHz.
REFERENCE DESIGN BOARD and LAYOUT GUIDELINES
MSOP & SO BOARDS
(Note: R
PU2 is not required. It is used for test measurement purposes only.)
20030569
FIGURE 8.
www.national.com
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