Datasheet

PCM5121, PCM5122
SLAS763A –AUGUST 2012–REVISED SEPTEMBER 2012 www.ti.com
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 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 Reserved
(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.
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)
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