LM49352RLX/NOPB National Semiconductor, LM49352RLX/NOPB Datasheet - Page 66

• 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

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24.0 Digital Effects Engine
Digital Signal Processor (DSP)
The LM49352 is designed to handle the entire audio signal conditioning and processing within the audio system, thereby freeing
up the workload of any other applications processor contained within the system. The LM49352 features two independent DSPs,
one for the DAC and the other for the ADC. Each DSP is fully featured and performs as a professional quality digital audio effects
engine. Both DSP engines feature digital volume control, automatic level control (ALC), digital soft clip compression, and a 5-band
parametric EQ. The effects chain of each DSP engine is shown by the diagrams below.
The ADC and DAC DSP engines can be cascaded together in any order via the digital mixer to combine different audio effects to
the same signal path. For example, a signal can be processed with high-pass filtering from the ADC effects engine with ALC from
the DAC effects engine. The 5-band parametric EQs from each DSP engine can be combined to form a single 10-band parametric
EQ or a single 5-band parametric EQ with ±30dB (instead of ±15dB) gain control for each band.
Bits
0
1
2
3
4
ADC_SCLP_ENB
ADC_HPF_ENB
ADC_ALC_ENB
ADC_EQ_ENB
ADC_PK_ENB
Field
This enables the ADC's High Pass Filter.
This enables the ADC's Automatic Level Control.
This enables the ADC's Peak Detector.
This enables the ADC's 5-band Parametric EQ.
This enables the ADC's Soft Clip Feature.
FIGURE 21. ADC DSP Effects Chain
FIGURE 22. DAC DSP Effects Chain
TABLE 43. ADC EFFECTS (0x70h)
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Description
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