STA381BWSTR STMicroelectronics, STA381BWSTR Datasheet - Page 30
STA381BWSTR
Manufacturer Part Number
STA381BWSTR
Description
Audio DSPs Sound Terminal 2.1 High EFF Dig Audio
Manufacturer
STMicroelectronics
Datasheet
1.STA381BWSTR.pdf
(171 pages)
Specifications of STA381BWSTR
Product Category
Audio DSPs
Rohs
yes
Operating Supply Voltage
4.5 V to 25.5 V
Operating Temperature Range
0 C to + 150 C
Mounting Style
SMD/SMT
Package / Case
VQFN-48
Snr
100 dB
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Device overview
4.3.3
4.3.4
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The band splitter filter coefficients have a user-selectable range [-1, 1), [-2, 2) and [-4, 4).
The RAM coefficient 0x7 is responsible for these settings according to
default value is [-4, 4).
Table 9.
Please refer to
and to
Figure 9.
Level meter
The level meter block measures the input signal level (in dB). Two kinds of measures are
performed: peak and RMS. The mapper configuration and the input signal automatically
determine which measurement to take into account.
Mapper
The mapper block computes the appropriate attenuation value (expressed in dB) to be
applied to the signal, basing its calculations on the level meter output value, on the
compressor threshold and on the limiter threshold.The attenuation value is then passed to
the attenuator block.
Input
Ch x
Table 13
CEXT_Bx[1]
Coefficients extended-range configuration 0x74h
Band splitter with 4
0
0
1
1
Section 6.24: User-defined coefficient control registers (addr 0x27 - 0x37)
for further details.
BQ 0
BQ 0
Band Splitter
Doc ID 018937 Rev 6
th
order filtering
CEXT_Bx[0]
BQ 1
BQ 1
0
1
0
1
Band 0
Band 1
…
…
+ =
Output
Ch x
Table
Reserved
Range
[-1;1)
[-2;2)
[-4;4)
9. The range
STA381BWS
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