STA015$013TR STMicroelectronics, STA015$013TR Datasheet - Page 30

• Manufacturer Part Number: STA015$013TR
• Description: IC DECODER AUDIO MPEG2.5 28SOIC
• Manufacturer: STMicroelectronics
• Type: Audio Decoderr

Specifications of STA015$013TR

• Applications: Sound Cards, Players, Recorders
• Voltage - Supply, Digital: 2.4 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Supply, Analog: -
• Other names: 497-3940-2

STA015
Hardware Reset: 0x00
The registers are considered logically concatenated and contain the fractional values for the PLL, for
44.1KHz reference frequency.
(see also PLLFRAC_L and PLLFRAC_H registers)
ADPCM_SAMPLE_FREQ
Address: 0x53 (83)
Type: R/W
Software Reset: 0x00
Hardware Reset: 0x00
ADPCM_SF: Adpcm Sample Frequency
PCMDIVIDER
Address: 0x54 (84)
Type: RW
Software Reset: 0x01
Hardware Reset: 0x01
PCMDIVIDER is used to set the frequency ratio between the OCLK (Oversampling Clock for DACs), and
the SCKT (Serial Audio Transmitter Clock).
The relation is the following:
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)
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PF15
MSB
MSB
MSB
PD7
b7
b7
b7
X
PF14
PD6
b6
b6
b6
X
PF13
PD5
b5
b5
b5
X
SCKT_freq
0x0A
0x0E
0x02
PF12
PD4
b4
b4
b4
=
--------------------------------------------- -
2 1
(
OCLK_freq
+
PF11
PCM_DIV
PD3
b3
b3
b3
16KHz
32KHz
8KHz
)
ADPCM_SF
PF10
PD2
b2
b2
b2
PF19
PD1
b1
b1
b1
LSB
LSB
LSB
PD0
PF8
b0
b0
b0