DA7210 datasheet(39/113 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

39 of 113

Alternatively it can provide dedicated voice band filtering at samples rates

 16 kHz (see blocks ‘ADC

IIR

’ and ‘DAC IIR’ in Figure 16).

An additional general purpose (GP) filter engine offers up to eight second-order biquad filter stages

with configurable 16-bit coefficients, and supports flexible digital audio routing and mixing

arrangements. Figure 16 shows some possible routings (a subset of the available settings) for filter

blocks GP1A to GP2D with the related control registers. Typical use cases with example

configurations are explained in the section 8.3.

DAC L

ADC L

ADC R

DAC R

GP2D

GP2C

GP2A

GP1D

GP1C

GP1A

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 Left

I2S/PCM Right

GP1B

GP2B

DAI Left Input

DAI Left Output

DAI Right Input

DAI Right Output

Figure 16: Digital signal processing engine (simplified block diagram)

The GP filter sections are implemented using a Direct Form 1 architecture, as shown in Figure 17.

This structure implements the transfer function:

H(z) = a0 + a1 z + a2 z2

1-b1 z - b2 z2

-1

X(n)

Y(n)

e.g.

GP1A_A0L

GP1A_A0H

0x2D/0x2E

e.g.

GP1A_A1L

GP1A_A1H

0x3D/0x3E

e.g.

GP1A_A2L

GP1A_A2H

0x4D/0x4E

e.g.

GP1A_B1L

GP1A_B1H

0x5D/0x5E

e.g.

GP1A_B2L

GP1A_B2H

0x6D/0x6E

Figure 17: Direct form I implementation of a second order IIR filter

Each of the five coefficients may be configured by the user, for each filter section. The coefficients

are specified as 16-

bit two’s-complement numbers, ranging from -2 to +2. Denominator coefficients

must be negated, that is, if b1 is positive then a negative value (-b1) must be programmed, and

conversely, if b1 is negative then a positive value (+b1) must be programmed. Coefficients must be

selected carefully to specify a stable filter.

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