Datasheet

STA333W Register description
Doc ID 13365 Rev 2 23/49
Interpolation ratio select
The STA333W has variable interpolation (oversampling) settings such that internal
processing and DDX 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.
Thermal warning recovery bypass
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.
Table 11. Interpolation ratio select
Bit R/W RST Name Description
4:3 R/W 00 IR [1:0]
Interpolation ratio select: Selects internal
interpolation ratio based on input I
2
S sample
frequency.
Table 12. IR bit settings as a function of input sample rate
Input sample rate f
S
(kHz) IR 1
st
stage interpolation ratio
32 00 2-times oversampling
44.1 00 2-times oversampling
48 00 2-times oversampling
88.2 01 Pass-through
96 01 Pass-through
176.2 10 2-times downsampling
192 10 2-times downsampling
Table 13. Thermal warning recovery
Bit R/W RST Name Description
5R/W1TWRB
Thermal warning recovery bypass:
0: thermal warning recovery enabled
1: thermal warning recovery disabled