PCM5121 datasheet(21/121 Pages) TI2

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PCM5121, PCM5122

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SLAS763C – AUGUST 2012 – REVISED OCTOBER 2018

Product Folder Links: PCM5121 PCM5122

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At fs=44.1 kHz, de-emphasis filter is supported.

8.3.4.2 Interpolation Filter

The PCM512x provides 4 types of interpolation filters, selectable by writing to Page 0, Register 43, D(4:0).

Table 7. ROM Preset Programs

PROGRAM

NUMBER

D(4:0)

DESCRIPTION

MINIMUM CYCLES

0 0000

Reserved

0 0001

Normal x8/x4/x2/x1 Interpolation Filter(1)

256

0 0010

Low Latency x8/x4/x2/x1 Interpolation Filter(1)

256

0 0011

High Attenuation x8/x4/x2 Interpolation Filter (1)

512

0 0100

Reserved

0 0101

Preset Process Flow

0 0110

Reserved

0 0111

Asymmetric FIR Interpolation Filter(1)

512

Reserved

1 1111

Reserved

The PCM512x supports 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 8.

Table 8. Sampling Modes and Oversampling Rates

SAMPLING MODE

SAMPLING FREQUENCY (fS) kHz

OVERSAMPLING RATE (OSR)

Single Rate

8 or 16

44.1

Dual Rate

88.2

Quad Rate

176.4

192

Octal Rate

384

1 (Bypass)

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