LM4924SD National Semiconductor, LM4924SD Datasheet - Page 14

• Manufacturer Part Number: LM4924SD
• Manufacturer: National Semiconductor

Specifications of LM4924SD

• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 2-Channel Stereo
• Output Power (typ): 0.04x2@16OhmW
• Audio Amplifier Function: Headphone
• Total Harmonic Distortion: 0.1@16Ohm@10mW%
• Single Supply Voltage (typ): 3V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Requirement: Single
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 66dB
• Single Supply Voltage (min): 1.5V
• Single Supply Voltage (max): 3.6V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 10
• Package Type: LLP EP
• Lead Free Status / Rohs Status: Not Compliant

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The LM4924 is unity-gain stable and requires no external
components besides gain-setting resistors, input coupling ca-
pacitors, and proper supply bypassing in the typical applica-
tion. However, if a very large closed-loop differential gain is
required, a feedback capacitor (C
width limit the amplifier. This feedback capacitor creates a low
pass filter that eliminates possible high frequency oscillations.
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 band-
FIGURE 4.
14
Care should be taken when calculating the -3dB frequency in
that an incorrect combination of R
response roll off before 20kHz. A typical combination of feed-
back resistor and capacitor that will not produce audio band
high frequency roll off is Rf = 20kΩ and C
components result in a -3dB point of approximately 320kHz.
f
and C
f
will cause frequency
f
= 25pF. These
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