LM49352 datasheet(59/106 Pages) TI

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RIGHT

DAC

LEFT

DAC

Distort

DIG Gain &

NG Mutes

ALC

-78 dB to +18 dB

LM49352

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SNAS467E – MARCH 2009 – REVISED MARCH 2013

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.

Figure 66. ADC DSP Effects Chain

Figure 67. DAC DSP Effects Chain

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.

Table 43. ADC EFFECTS (0x70h)

Bits

Field

Description

ADC_HPF_ENB

This enables the ADC's High Pass Filter.

ADC_ALC_ENB

This enables the ADC's Automatic Level Control.

ADC_PK_ENB

This enables the ADC's Peak Detector.

ADC_EQ_ENB

This enables the ADC's 5-band Parametric EQ.

ADC_SCLP_ENB

This enables the ADC's Soft Clip Feature.

Table 44. DAC EFFECTS (0x71h)

Bits

Field

Description

DAC_ALC_ENB

This enables the DAC's Automatic Level Control.

DAC_PK_ENB

This enables the DAC's Peak Detector.

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