STA350B datasheet(79/94 Pages) STMICROELECTRONICS

79 / 94 page

DocID018572 Rev 7

79/94

STA350B, STA350BW

8.18.5

Extended biquad selector

De-emphasis filter as well as bass and treble controls can be configured as user-defined

filters when the equalization coefficients link is activated (BQL = 1) and the corresponding

BQx bit is set to 1.

When filters from 5th to 7th are configured as user-programmable, the corresponding

coefficients are stored respectively in addresses 0x20-0x24 (BQ5), 0x25-0x29 (BQ6), 0x2A-

0x2E (BQ7) as in Table 71.

Note:

BQx bits are ignored if BQL = 0 or if DEMP = 1 (relevant for BQ5) or CxTCB = 1 (relevant for

BQ6 and BQ7).

8.19

EQ soft-volume configuration registers (addr 0x37 - 0x38)

The soft-volume update has a fixed rate by default. Using register 0x37 and 0x38 it is

possible to override the default behavior allowing different volume change rates.

It is also possible to independently define the fade-in (volume is increased) and fade-out

(volume is decreased) rates according to the desired behavior.

BQ5

Mode

Pre-set de-emphasis filter selected

User-defined biquad 5 coefficients are selected

BQ6

Mode

Pre-set bass filter selected as per Table 64

User-defined biquad 6 coefficients are selected

BQ7

Mode

Pre-set treble filter selected as per Table 64

User-defined biquad 7 coefficients are selected

SVUPE

SVUP[4]

SVUP[3]

SVUP[2]

SVUP[1]

SVUP[0]

0000

SVDWE

SVDW4]

SVDW[3]

SVDW[2]

SVDW[1]

SVDW[0]

0000

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