STA32813TR View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STA32813TR Datasheet PDF : 57 Pages
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STA328
Register description
bits determine the PLL factor generating the internal clock and the IR bit determines the
oversampling ratio used internally.
Table 11. IR and MCS settings for input sample rate and clock rate
Input sample rate
IR
fs (kHz)
MCS[2:0]
000
001
010
011
100
32, 44.1, 48
00 768 fs 512 fs 384 fs 256 fs 128 fs
88.2, 96
01 384 fs 256 fs 192 fs 128 fs 64 fs
176.4, 192
1X 384 fs 256 fs 192 fs 128 fs 64 fs
101
576 fs
x
x
Table 12. Interpolation ratio select
Bit R/W RST Name
Description
4:3 RW 00 IR[1:0]
Interpolation ratio select: selects internal interpolation ratio
based on input I2S sample frequency
The STA328 has variable interpolation (re-sampling) 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 down-sample by a factor of 2.
The IR bits determine the re-sampling ratio of this interpolation.
Table 13. IR bit settings as a function of input sample rate
Input sample rate fs (kHz) IR[1,0]
1st stage interpolation ratio
32
00
2 times over-sampling
44.1
00
2 times over-sampling
48
00
2 times over-sampling
88.2
01
Pass-through
96
01
Pass-through
176.4
192
10
Down-sampling by 2
10
Down-sampling by 2
Table 14. Thermal warning recovery bypass
Bit R/W RST
Name
Description
5 RW 1 TWRB
Thermal warning recovery bypass:
0: thermal warning recovery enabled
1: thermal warning recovery disabled
If the thermal warning adjustment is enabled (TWAB = 0), then the thermal warning
recovery will determine if the adjustment is removed when thermal warning is negative. If
TWRB = 0 and TWAB = 0, then when a thermal warning disappears the gain adjustment
determined by the thermal warning post-scale (default = -3 dB) will be removed and the gain
will be added back to the system. If TWRB = 1 and TWAB = 0, then when a thermal warning
disappears the thermal warning post-scale gain adjustment will remain until TWRB is
changed to zero or the device is reset.
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