STA310 STMicroelectronics, STA310 Datasheet - Page 26

• Manufacturer Part Number: STA310
• Description: IC AUDIO DECODER 6+2CH 80-TQFP
• Manufacturer: STMicroelectronics
• Type: Audio Decoderr

Specifications of STA310

• Applications: HDTV, Players, Receivers, Set-Top Boxes
• Voltage - Supply, Analog: 2.5V
• Voltage - Supply, Digital: 2.5V
• Mounting Type: Surface Mount
• Package / Case: 80-TQFP, 80-VQFP
• Audio Codec Type: MP3 Decoder
• No. Of Dacs: 3
• No. Of Input Channels: 2
• No. Of Output Channels: 6
• Adc / Dac Resolution: 32bit
• Sampling Rate: 192kHz
• Interface Type: I2C, Serial, Parallel
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8856; STA310

STA310
Figure 14. PCM Output Configurations
5.2 PCM scaling
PCM scaling is needed for every decoding mode (AC3, Pro Logic, MPEG, PCM). It is applied at the end of the
filtering steps before PCM output, allowing maximum effective word width for most of the signal processing be-
fore.
Master volume (PCM_SCALE register) and balances (BAL_LR and BAL_SUR registers) are implemented for
PCM scaling.
5.3 Output quantization
For optimal results for 16/18/20-bit DACs, a quantization with rounding is applied together with the PCM scaling.
The sample value is multiplied by a rounding factor and rounded to 24 bits. The result is then left shifted (4/6/8)
for PCM output.
The output precision is selectable from the 16bits/word to 24 bits/word by configuring the field PREC in the reg-
ister PCMCONF.
5.4 Interface and output formats
The decoded audio data are output in serial PCM format.
The interface consists of the following signals
26/90
PCM_OUT0, 1, 2
SCLK
LRCLK
PCMCLK
LFE
L
C
R
LS
RS
L
C
R
LS
RS
LFE
PCM data, output,
Bit clock (or serial clock), output,
Word clock (or Left/Right channel select clock), output,
PCM clock, input or output (see <CrossRef><BlueHT>Clocks <BlueHT>on page 11 for details).
-16dB
-16dB
-16dB
-16dB
-16dB
-6dB
Not used with Prologic
Configuration 0
Configuration 2
-4dB
L
C
R
LS
RS
LFE
L
C
R
LS
RS
L
C
R
LS
RS
LFE
L
C
R
LS
RS
LFE
-8,5dB
-8,5dB
Configurations 3 and 4
Configuration 1
Not used with Prologic
-18.5dB
Not used with Prologic
-18.5dB
configuration 4
Not used in
L
C
R
LS
RS
SUB
L
C
R
LS
RS
SUB