STA559BWQS13TR STMICROELECTRONICS [STMicroelectronics], STA559BWQS13TR Datasheet - Page 28

• Manufacturer Part Number: STA559BWQS13TR
• Description: 5-V, 2-A, 2.1-channel high-efficiency digital audio system with QSound QHD
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Register description
5.1.2
28/66
The external clock frequency provided to the XTI pin must be a multiple of the input sample
frequency, f
The relationship between the input clock and the input sample rate is determined by both
the MCSx and the IR (input rate) register bits. The MCSx bits determine the PLL factor
generating the internal clock and the IR bit determines the oversampling ratio used
internally
Table 11.
Interpolation ratio select
Table 12.
The STA559BWQS 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.
Table 13.
32, 44.1, 48
88.2, 96
176.4, 192
4..3
Bit
Input sample rate
Input sample rate fs (kHz)
fs (kHz)
RW
RW
s
.
Input sample rates and clock select
Interpolation ratio select
IR bit settings as a function of input sample rate
176.4
44.1
88.2
192
32
48
96
RST
00
1X
00
01
IR
IR [1:0]
Name
576 fs
101
NA
NA
00
00
00
01
01
10
10
IR
Interpolation ratio select: selects internal interpolation ratio
based on input I
128 fs
64 fs
32 fs
100
2
1st stage interpolation ratio
S sample frequency
256 fs
128 fs
64fs
011
MCS[2:0]
2 times downsampling
2 times downsampling
2 times oversampling
2 times oversampling
2 times oversampling
Description
Pass-through
Pass-through
384 fs
192 fs
96 fs
010
512 fs
256 fs
128 fs
001
STA559BWQS
768 fs
384 fs
192 fs
000