STA339BW datasheet(69/77 Pages) STMICROELECTRONICS

69 / 77 page

STA339BW

Doc ID 15251 Rev 5

69/77

6.18.5

Extended BIQUAD selector

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

when 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 72.

Note:

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

BQ6 and BQ7).

6.19

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

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.

Table 80.

De-emphasis filter setup

BQ5

Mode

Preset de-emphasis filter selected

User defined biquad 5 coefficients are selected

Table 81.

Bass filter setup

BQ6

Mode

Preset bass filter selected as per Table 65

User defined biquad 6 coefficients are selected

Table 82.

Treble filter setup

BQ7

Mode

Preset treble filter selected as per Table 65

User defined biquad 7 coefficients are selected

Reserved

SVUPE

SVUP[4]

SVUP[3]

SVUP[2]

SVUP[1]

SVUP[0]

000

Reserved

SVDWE

SVDW4]

SVDW[3]

SVDW[2]

SVDW[1]

SVDW[0]

000

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