LM49352RLX/NOPB National Semiconductor, LM49352RLX/NOPB Datasheet - Page 83

• Manufacturer Part Number: LM49352RLX/NOPB
• Description: IC AMP AUDIO MONO D1.4W 36USMD
• Manufacturer: National Semiconductor
• Series: Boomer®, PowerWise®r
• Type: Class Dr

Specifications of LM49352RLX/NOPB

• Output Type: 1-Channel (Mono) with Mono and Stereo Headphones
• Max Output Power X Channels @ Load: 1.4W x 1 @ 8 Ohm; 65mW x 2 @ 32 Ohm
• Features: Depop, Differential Inputs, I²C, I²S, Microphone, Shutdown, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 36-MicroSMDxt
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Other names: LM49352RLX

Soft Knee Function
The LM49352’s audio compressor also features a soft knee function that smoothes the harsh edges found during clipping of an
audio signal. For audio signals higher than the compressor threshold level, the soft knee function gradually increases the com-
pression ratio for increasing levels of audio signal beyond the compressor threshold. To achieve the smoothing effect to prevent
hard clipping, the soft knee function initially compresses the audio signal at the smallest ratio and then incrementally increases the
compression ratio if required. The highest level of compression applied by the soft knee function is set by the compressor ratio.
The effect of the soft knee function is shown in Figure 26.
30072790
FIGURE 26. Soft Knee Example with Compression Ratio Setting of 1:3.4
83
www.national.com