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STA014T データシート(PDF) 24 Page - STMicroelectronics |
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STA014T データシート(HTML) 24 Page - STMicroelectronics |
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24 / 45 page ![]() 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+PCM_DIV) * 32* LRCKT_Freq (when 16 bit PCM mode is used) 3) OCLK_ Freq = 2 * (1+PCM_DIV) * 64* LRCKT_Freq (when 32 bit PCM mode is used) 4) PCM_DIV = (O_FAC/64) - 1 in 16 bit mode 5) PCM_DIV = (O_FAC/128) - 1 in 32 bit mode Example for setting: MSB LSB b7 b6 b5 b4 b3 b2 b1 b0 Description PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0 000 0011 1 16 bit mode 512 x Fs 000 0010 1 16 bit mode 384 x Fs 000 0001 1 16 bit mode 256 x Fs 000 0001 1 32 bit mode 512 x Fs 000 0001 0 32 bit mode 384 x Fs 000 0000 1 32 bit mode 256 x Fs for 16 bit PCM Mode O_FAC = 512 ; PCM_DIV = 7 O_FAC = 256 ; PCM_DIV = 3 O_FAC = 384 ; PCM_DIV = 5 for 32 bit PCM Mode O_FAC = 512 ; PCM_DIV = 3 O_FAC = 256 ; PCM_DIV = 1 O_FAC = 384 ; PCM_DIV = 2 STA014-STA014B-STA014T 24/45 |
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