lm4924sdx National Semiconductor Corporation, lm4924sdx Datasheet - Page 13

• Manufacturer Part Number: lm4924sdx
• Description: 2 Cell Battery, 40mw Per Channel Output Capacitor-less Ocl Stereo Headphone Audio Amplifier
• Manufacturer: National Semiconductor Corporation

Application Information
The LM4924 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
bandwidth limit the amplifier. This feedback capacitor cre-
REFERENCE DESIGN BOARD and LAYOUT GUIDELINES
MSOP & SD BOARDS
(Note: R
PU
2 is not required. It is used for test measurement purposes only.)
f
) may be needed to
(Continued)
FIGURE 4.
13
ates 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
cause frequency response roll off before 20kHz. A typical
combination of feedback resistor and capacitor that will not
produce audio band high frequency roll off is Rf = 20kΩ and
C
approximately 320kHz.
f
= 25pF. These components result in a -3dB point of
20121030
f
www.national.com
and C
f
will