STA3398 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
STA3398
STMicroelectronics
'STA3398' PDF : 78 Pages View PDF
STA339BW
Register description
7.1.2
Interpolation ratio select
Bit
4:3
R/W
R/W
RST
00
Table 13. Internal interpolation ratio
Name
Description
IR [1:0]
Selects internal interpolation ratio based on input I2S
sample frequency
The STA339BW has variable interpolation (oversampling) settings such that internal
processing and FFX output rates remain consistent. The first processing block interpolates
by either 2-times or 1-time (pass-through) or provides a 2-times downsample. The
oversampling ratio of this interpolation is determined by the IR bits.
Table 14. IR bit settings as a function of input sample rate
Input sample rate fs (kHz)
IR
1st stage interpolation ratio
32
44.1
48
88.2
96
176.4
192
00
2 times oversampling
00
2 times oversampling
00
2 times oversampling
01
Pass-through
01
Pass-through
10
2 times downsampling
10
2 times downsampling
7.1.3
Thermal warning recovery bypass
Bit R/W
5
R/W
Table 15. Thermal warning recovery bypass
RST
Name
Description
1
TWRB
0: Thermal warning recovery enabled
1: Thermal warning recovery disabled
7.1.4
If the thermal warning adjustment is enabled (TWAB = 0), then the thermal warning recovery
determines if the -3 dB output limit is removed when thermal warning is negative.
If TWRB = 0 and TWAB = 0, then when a thermal warning disappears the -3 dB output limit
is removed and the gain is added back to the system. If TWRB = 1 and TWAB = 0, then
when a thermal warning disappears the -3 dB output limit remains until TWRB is changed to
zero or the device is reset.
Thermal warning adjustment bypass
Bit R/W
6
R/W
Table 16. Thermal warning adjustment bypass
RST
Name
Description
1
TWAB
0: Thermal warning adjustment enabled
1: Thermal warning adjustment disabled
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