Texas Instruments PCM5122 Evaluation Module PCM5122EVM-U PCM5122EVM-U Datenbogen
Produktcode
PCM5122EVM-U
SLAS759A – AUGUST 2012 – REVISED SEPTEMBER 2012
Interpolation Filter
The PCM514x provides 4 types of interpolation filters, selectable by writing to Page 0, Register 43, D(4:0).
Table 19. ROM Preset Programs
Program number
D(4:0)
Description
Minimum Cycles
0
0 0000
Reserved
1
0 0001
Normal x8/x4/x2/x1 Interpolation Filter
(1)
256
2
0 0010
Low Latency x8/x4/x2/x1 Interpolation Filter
(1)
256
3
0 0011
High Attenuation x8/x4/x2 Interpolation Filter
(1)
512
4
0 0100
Reserved
5
0 0101
Preset Process Flow
n/a
6
0 0110
Reserved
7
0 0111
Asymmetric FIR Interpolation Filter
(1)
512
:
:
Reserved
31
1 1111
RAM program
(1)
f
S
44.1kHz De-emphasis filter is supported.
The PCM514xsupports four sampling modes (single rate, dual rate, quad rate, and octal rate) which produce
different oversampling rates (OSR) in the interpolation digital filter operation. These are shown in
different oversampling rates (OSR) in the interpolation digital filter operation. These are shown in
.
Table 20. Sampling Modes and Oversampling Rates
Sampling Mode
Sampling Frequency (f
S
) kHz
Oversampling Rate (OSR)
8
16
Single Rate
32
8 or 16
44.1
48
88.2
Dual Rate
4
96
176.4
Quad Rate
2
192
Octal Rate
384
1 (Bypass)
42
Copyright © 2012, Texas Instruments Incorporated
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