PCM5121_14 Datasheet, PDF (42/108 Pages) Texas Instruments – 2VRMS DirectPath™, 112/106dB Audio Stereo DAC with 32-bit, 384kHz PCM Interface

PCM5121, PCM5122
SLAS763A – AUGUST 2012 – REVISED SEPTEMBER 2012
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Interpolation Filter
The PCM512x provides 4 types of interpolation filters, selectable by writing to Page 0, Register 43, D(4:0).
Table 19. ROM Preset Programs
Program number
0
1
2
3
4
5
6
7
:
31
D(4:0)
0 0000
0 0001
0 0010
0 0011
0 0100
0 0101
0 0110
0 0111
:
1 1111
Description
Reserved
Normal x8/x4/x2/x1 Interpolation Filter⁽¹⁾
Low Latency x8/x4/x2/x1 Interpolation Filter⁽¹⁾
High Attenuation x8/x4/x2 Interpolation Filter⁽¹⁾
Reserved
Preset Process Flow
Reserved
Asymmetric FIR Interpolation Filter⁽¹⁾
Reserved
Reserved
Minimum Cycles
256
256
512
n/a
512
(1) f_S 44.1kHz De-emphasis filter is supported.
The PCM512xsupports 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 Table 20.
Sampling Mode
Single Rate
Dual Rate
Quad Rate
Octal Rate
Table 20. Sampling Modes and Oversampling Rates
Sampling Frequency (f_S) kHz
8
16
32
44.1
48
88.2
96
176.4
192
384
Oversampling Rate (OSR)
8 or 16
4
2
1 (Bypass)
42
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