ADMP441 datasheet(10/16 Pages) AD

Nome de Peças	ADMP441

Descrição Electrónicos	Omnidirectional Microphone with Bottom Port and I2S Digital Output

Download	16 Pages

Scroll/Zoom	100%

Fabricante Electrônico	AD [Analog Devices]

Página de início	http://www.analog.com

Logo

10 / 16 page

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

NORMALIZED FREQUENCY (

fS)

Figure 13. Digital Low-Pass Filter Magnitude Response

Nº de peça semelhante - ADMP441

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Analog Devices	ADMP441	357Kb / 16P	Omnidirectional Microphone REV. A
	ADMP441ACEZ-RL	357Kb / 16P	Omnidirectional Microphone REV. A
	ADMP441ACEZ-RL7	357Kb / 16P	Omnidirectional Microphone REV. A

More results

Descrição semelhante - ADMP441

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
List of Unclassifed Man...	INMP441	472Kb / 21P	Omnidirectional Microphone with Bottom Port and I2S Digital Output
Analog Devices	ADMP421BCEZ-RL	499Kb / 17P	Omnidirectional Microphone with Bottom Port and Digital Output Rev. D
Analog Devices	ADMP421	188Kb / 16P	Omnidirectional Microphone with Bottom Port and Digital Output REV. 0
TDK Electronics	INMP421	504Kb / 21P	Omnidirectional Microphone with Bottom Port and PDM Digital Output
	INMP405	373Kb / 13P	Omnidirectional Microphone with Bottom Port and Analog Output
	INMP401	336Kb / 14P	Omnidirectional Microphone with Bottom Port and Analog Output
Analog Devices	ADMP401ACEZ	462Kb / 13P	Omnidirectional Microphone with Bottom Port and Analog Output Rev. E
Analog Devices	ADMP405	426Kb / 12P	Omnidirectional Microphone with Bottom Port and Analog Output Rev. PrH
TDK Electronics	INMP404	359Kb / 13P	Omnidirectional Microphone with Bottom Port and Analog Output
TDK Electronics	INMP411	375Kb / 14P	Omnidirectional Microphone with Bottom Port and Analog Output

More results

ADMP441 Folha de dados(PDF) 10 Page - Analog Devices

ADMP441 Folha de dados(HTML) 10 Page - Analog Devices

Nº de peça semelhante - ADMP441

Descrição semelhante - ADMP441

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Folha de dados Download

Ligação URL