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參數(shù)資料
| 型號： | EVAL-ADMP441Z-FLEX |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL BOARD FOR ADMP441 |
| 標準包裝： | 1 |
| 系列： | iMEMS® |
| 主要目的： | 音頻，MEMS 全向麥克風 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADMP441 |
| 主要屬性： | 數(shù)字輸出 |
| 已供物品： | 2 個板，電源 |
ADMP441
Data Sheet
Rev. B | Page 10 of 16
DIGITAL FILTER CHARACTERISTICS
The ADMP441 has an internal digital band-pass filter. A
high-pass filter eliminates unwanted low frequency signals.
A low-pass filter allows the user to scale the pass band with
the sampling frequency as well as perform required noise
reduction.
High-Pass Filter
The ADMP441 incorporates a high-pass filter to remove unwanted
dc and very low frequency components. Table 7 shows the high-
pass characteristics for a nominal sampling rate of 48 kHz. The
cutoff frequency scales with changes in sampling rate.
Table 7. High-Pass Filter Characteristics
Frequency
Attenuation
3.7 Hz
–3.0 dB
10.4 Hz
–0.5 dB
21.6 Hz
–0.1 dB
This digital filter response is in addition to the natural high-
pass response of the ADMP441 MEMS acoustic transducer that
has a 3 dB cutoff of 60 Hz.
Low-Pass Filter
The analog-to-digital converter in the ADMP441 is a single-bit,
high order, sigma-delta (Σ-Δ) running at a high oversampling
ratio. The noise shaping of the converter pushes the majority of
the noise well above the audio band and gives the microphone a
wide dynamic range. However, it does require a good quality
low-pass filter to eliminate the high frequency noise.
Figure 13 shows the response of this digital low-pass filter
included in the microphone. The pass band of the filter extends
to 0.423 × fS and, in that band, has an unnoticeable 0.04 dB of
ripple. The high frequency cutoff of 6 dB occurs at 0.5 × fS. A
48 kHz sampling rate results in a pass band of 20.3 kHz and a
half amplitude corner at 24 kHz; the stop-band attenuation of
the filter is greater than 60 dB. Note that these filter specifica-
tions scale with sampling frequency.
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M
AG
NI
T
UDE
(
d
B)
NORMALIZED FREQUENCY (
fS)
09568-
008
Figure 13. Digital Low-Pass Filter Magnitude Response
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