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STAMP0 Datasheet(PDF) 16 Page - STMicroelectronics

No. de pieza STAMP0
Descripción Electrónicos  Microphone array processor with TDM output and recombination for wide dynamic range microphones
PDF  62 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STAMP0 Datasheet(HTML) 16 Page - STMicroelectronics

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Architecture
STAMP0
16/62
DocID028639 Rev 1
4.2.1
Decimation filters
The STAMP0 provides a decimation section that is used to convert the sample rate from 64
x Fs to Fs.
The decimation is performed using three FIR filters (STAGE1, STAGE2 and STAGE3).
Each filtering stage has a decimation factor of 4, consequently both the number of TAPS
and coefficient values are different.
The total FIR frequency response (with respect to PDM frequency) is shown in Figure 6:
"Downsampling FIR frequency response (overall)" and the characteristics are listed in
Table 7: "Downsampling section overall characteristics".
Figure 6: Downsampling FIR frequency response (overall)
Table 7: Downsampling section overall characteristics
Symbol
Parameter
Min.
Typ.
Max.
Unit
PBW
Pass band relative to PDM sampling
frequency
0.00703125
SBW
Stop band relative to PDM sampling
frequency
0.078125
OOBA
Out of band attenuation
100
dB
IBR
In band ripple
0.1
dB
LT
Total latency
562
PDM
samples
Obsolete
Product(s)
- Obsolete
Product(s)



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