STA3398 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
STA3398
STMicroelectronics
'STA3398' PDF : 78 Pages View PDF
Register description
STA339BW
7.18.5
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.
BQ5
0
1
Table 81. De-emphasis filter setup
Mode
Preset de-emphasis filter selected
User defined biquad 5 coefficients are selected
BQ6
0
1
Table 82. Bass filter setup
Mode
Preset bass filter selected as per Table 66
User defined biquad 6 coefficients are selected
Note:
BQ7
0
1
Table 83. Treble filter setup
Mode
Preset treble filter selected as per Table 66
User defined biquad 7 coefficients are selected
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 73.
BQx bits are ignored if BQL = 0 or if DEMP = 1 (relevant for BQ5) or CxTCB = 1 (relevant for
BQ6 and BQ7).
7.19
EQ soft volume configuration registers (addr 0x37 - 0x38)
D7
D6
Reserved
0
0
D5
SVUPE
0
D4
SVUP[4]
0
D3
SVUP[3]
0
D2
SVUP[2]
0
D1
SVUP[1]
0
D0
SVUP[0]
0
D7
D6
Reserved
0
0
D5
SVDWE
0
D4
SVDW4]
0
D3
SVDW[3]
0
D2
SVDW[2]
0
D1
SVDW[1]
0
D0
SVDW[0]
0
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.
70/78
DocID15251 Rev 7
Share Link: 