DA7210 datasheet(44/113 Pages) DIALOG

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DA7210

Ultra-low power stereo codec

Company confidential

Datasheet

Revision 3a

15-Oct-2015

CFR0011-120-00 Rev 5

44 of 113

8.4.2

Digital audio processing for the record path

When Record only is selected, the DAC and playback filter units can be powered down. The general

purpose filter engine can offer 8th order stereo filters to correct the acoustic frequency response of

the connected microphone (Figure 23).

If less filtering is required, filter stages can be bypassed using the filter enable controls described in

Table 24.

For mono playback, this can also be achieved by switching off a complete channel (blocks not

required are highlighted in the following figures in light grey).

DAC L

ADC L

ADC R

DAC R

ADC

IIR L

ADC

HP L

DAC

HP L

DAC

IIR L

ADC

HP R

ADC

IIR R

DAC

IIR R

DAC

HP R

I2S/PCM L

I2S/PCM R

Figure 23: Record only

If it is intended to listen to the recording as it is being made, or to listen to another sound at the same

time as the recording, the general purpose filter engine offers a split mode for parallel record and

playback equalisation. This mode supports applications that perform active noise cancellation.

DAC L

ADC L

ADC R

DAC R

ADC

IIR L

ADC

HP L

DAC

HP L

DAC

IIR L

ADC

HP R

ADC

IIR R

DAC

IIR R

DAC

HP R

I2S/PCM L

I2S/PCM R

Figure 24: Record with sound monitor

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