STA309B View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA309B' PDF : 66 Pages View PDF
STA309B
Registers
In dynamic range compression mode the limiter threshold values vary with the volume
settings allowing a nighttime listening mode that provides a reduction in the dynamic range
regardless of the volume level.
Bit RW RST
Name
Description
2
RW
0
DEMP
De-emphasis:
0: no de-emphasis
1: de-emphasis
By setting this bit to one, de-emphasis will be implemented on all channels. When this is
used, it takes the place of biquad #7 in each channel and any coefficients using biquad #1
will be ignored. The DSPB (DSP bypass) bit must be set to 0 for de-emphasis to function.
Bit RW RST
Name
Description
3
RW
0
PSL
Post-scale link:
0: each channel uses individual post-scale value
1: each channel uses channel 1 post-scale value
Post-Scale functionality can be used for power-supply error correction. For multichannel
applications running off the same power supply, the post-scale values can be linked to the
value of channel 1 for ease of use and in order to update the values faster.
Bit RW RST
Name
Description
4
RW
0
BQL
Biquad link:
0: each channel uses coefficient values
1: each channel uses channel 1 coefficient values
For ease of use, all channels can use the biquad coefficients loaded into the channel 1
coefficient RAM space by setting the BQL bit to 1. Therefore, any EQ updates only have to
be performed once.
Bit RW
7:5 RW
RST
Name
00 PWMS[2:0]
Description
PWM speed selection:
PWMS[1:0]
000
001
010
011
100
PWM output speed
Normal speed (384 kHz) (all channels)
Half-speed (192 kHz) (all channels)
Double-speed (768 kHz) (all channels)
Normal speed (channels 1-6), double-speed (channels 7-8)
Odd speed (341.3 kHz) (all channels)
Doc ID 022570 Rev 2
29/66
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