STA003T datasheet(19/32 Pages) STMICROELECTRONICS

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The Oversampling Factor (O_FAC) is related to OCLK and SCKT by the following expression:

1) OCLK_freq = O_FAC * LRCKT_ Freq

(DAC relation)

2) OCLK_ Freq = 2 * (1+PCMDIVIDER) * 32*

LRCKT_Freq (when 16 bit PCM mode is used)

3) OCLK_ Freq = 2 * (1+PCMDIVIDER) * 64*

LRCKT_Freq (when 32 bit PCM mode is used)

4) PCMDIVIDER = (O_FAC/64) - 1 in 16 bit mode

5) PCMDIVIDER = (O_FAC/128) - 1 in 32 bit mode

Example for setting:

MSB

LSB

Description

PD7

PD6

PD5

PD4

PD3

PD2

PD1

PD0

000

0011

16 bit mode

512 x Fs

000

0010

16 bit mode

384 x Fs

000

0001

16 bit mode

256 x Fs

000

0001

32 bit mode

512 x Fs

000

0001

32 bit mode

384 x Fs

000

0000

32 bit mode

256 x Fs

for 16 bit PCM Mode

O_FAC = 512 ; PCMDIVIDER = 7

O_FAC = 256 ; PCMDIVIDER = 3

O_FAC = 384 ; PCMDIVIDER = 5

for 32 bit PCM Mode

O_FAC = 512 ; PCMDIVIDER = 3

O_FAC = 256 ; PCMDIVIDER = 1

O_FAC = 384 ; PCMDIVIDER = 2

STA003T

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