sta015t STMicroelectronics, sta015t Datasheet - Page 24

• Manufacturer Part Number: sta015t
• Description: Mpeg 2.5 Layer Iii Audio Decoder With Adpcm Capability
• Manufacturer: STMicroelectronics

STA015-STA015B-STA015T
The Oversampling Factor (O_FAC) is related to OCLK and SCKT by the following expression:
1) OCLK_freq = O_FAC * LRCKT_ Freq
2) OCLK_ Freq = 2 * (1+PCM_DIV) * 32*
3) OCLK_ Freq = 2 * (1+PCM_DIV) * 64*
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:
for 16 bit PCM Mode
O_FAC = 512 ; PCM_DIV = 7
O_FAC = 256 ; PCM_DIV = 3
O_FAC = 384 ; PCM_DIV = 5
24/44
MSB
(DAC relation)
LRCKT_Freq (when 16 bit PCM mode is used)
LRCKT_Freq (when 32 bit PCM mode is used)
PD7
b7
0
0
0
0
0
0
PD6
b6
0
0
0
0
0
0
PD5
b5
0
0
0
0
0
0
PD4
b4
0
0
0
0
0
0
PD3
b3
0
0
0
0
0
0
PD2
b2
1
1
0
0
0
0
for 32 bit PCM Mode
O_FAC = 512 ; PCM_DIV = 3
O_FAC = 256 ; PCM_DIV = 1
O_FAC = 384 ; PCM_DIV = 2
PD1
b1
1
0
1
1
1
0
PD0
LSB
b0
1
1
1
1
0
1
16 bit mode
16 bit mode
16 bit mode
32 bit mode
32 bit mode
32 bit mode
Description
512 x Fs
384 x Fs
256 x Fs
512 x Fs
384 x Fs
256 x Fs