STA381BWS datasheet(154/174 Pages) STMICROELECTRONICS

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STA381BWS

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DocID018937 Rev 7

7.21

Extended coefficient range up to -4...4 (address 0x49, 0x4A)

Biquads from 1 to 7 have in the STA381BWS the possibility to extend the coefficient range

from [-1,1) to [-4..4) which allows the implementation of high-shelf filters that may require a

coefficient dynamic greater in absolute value than 1.

Three ranges are available, [-1;1) [-2;2) [-4;4). By default, the extended range is activated

Each biquad has its independent setting according to the following table.

Table 169. Coefficients extended range configuration

In this case the user can decide, for each filter stage, the right coefficients range. Note that

for a given biquad, the same range will be applied to the left and right (channel 1 and

channel 2).

Crossover biquad does not have the availability of this feature, maintaining the [-1;1) range

unchanged.

7.22

Miscellaneous registers (address 0x4B, 0x4C)

7.22.1

Rate power-down enable (RPDNEN) bit (address 0x4B, bit D7)

In the STA381BWS, by default, the power-down pin and I2C power-down act on mute

commands to perform the fade-out. This default can be changed so that the fade-out can be

started using master volume. The RPDNEN bit, when set, activates this feature.

CEXT_B4[1]

CEXT_B4[0]

CEXT_B3[1]

CEXT_B3[0]

CEXT_B2[1]

CEXT_B2[0]

CEXT_B1[1]

CEXT_B1[0]

10101010

reserved

CEXT_B7[1]

CEXT_B7[0]

CEXT_B6[1]

CEXT_B6[0]

CEXT_B51]

CEXT_B5[0]

00101010

CEXT_Bx[1]

CEXT_Bx[0]

Range

[-1;1)

[-2;2)

[-4;4)

Reserved

RPDNEN

BRIDGOFF

CPWMEN

reserved

01100100

LPDP

LPD

LPDE

PNDLSL[2]

PNDLSL[1]

PNDLSL[0]

reserved

SHEN

01001100

Obsolete

Product(s)

- Obsolete

Product(s)

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