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參數(shù)資料
| 型號： | EVAL-ADMP404Z-FLEX |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR ADMP404 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | iMEMS® |
| 主要目的： | 音頻，MEMS 全向麥克風(fēng) |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADMP404 |
| 主要屬性： | 模擬輸出，200 歐姆阻抗 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | ADMP404ACEZ-RLDKR-ND - MIC MEMS OMNI-DIR ANALOG 3LGA ADMP404ACEZ-RLCT-ND - MIC MEMS OMNI-DIR ANALOG 3LGA ADMP404ACEZ-RLTR-ND - MIC MEMS OMNI-DIR ANALOG 3LGA ADMP404ACEZ-RL7TR-ND - MIC MEMS OMNI-DIR ANALOG 3LGA |
Data Sheet
ADMP404
Rev. C | Page 7 of 12
APPLICATIONS INFORMATION
CONNECTING TO ANALOG DEVICES AUDIO
CODECS
The ADMP404 output can be connected to a dedicated codec
microphone input (see Figure 7) or to a high input impedance
gain stage (see Figure 8). A 0.1 F ceramic capacitor placed close
to the ADMP404 supply pin is used for testing and is recom-
mended to adequately decouple the microphone from noise on
the power supply. A dc-blocking capacitor is required at the
output of the microphone. This capacitor creates a high-pass
filter with a corner frequency at
fC = 1/(2π × C × R)
where R is the input impedance of the codec.
A minimum value of 2.2 F is recommended in Figure 7
can be as low as 2 k at its highest PGA gain setting, which results
in a high-pass filter corner frequency at about 37 Hz. Figure 8
configured as a noninverting preamplifier.
08616-
020
ADAU1761
OR
ADAU1361
ADMP404
VDD
GND
OUTPUT
LINN
LINP
MICBIAS
CM
2.2F
MINIMUM
0.1F
Figure 7. ADMP404 Connected to the Analog Devices ADAU1761 or
ADAU1361 Codec
08616-
021
GAIN = (R1 + R2)/R1
ADMP404
GND
OUTPUT
1F
MINIMUM
0.1F
VOUT
VREF
ADA4897-1
10k
R1
R2
VDD
Figure 8. ADMP404 Connected to the ADA4897-1 Op Amp
SUPPORTING DOCUMENTS
Evaluation Board User Guide
UG-142, EVAL-ADMP404Z-FLEX: Bottom-Ported Analog
Output MEMS Microphone Evaluation Board
Application Notes
AN-1003, Recommendations for Mounting and Connecting
Analog Devices, Inc., Bottom-Ported MEMS Microphones
AN-1068, Reflow Soldering of the MEMS Microphone
AN-1112, Microphone Specifications Explained
AN-1124, Recommendations for Sealing Analog Devices, Inc.,
Bottom-Port MEMS Microphones from Dust and Liquid
Ingress
AN-1140, Microphone Array Beamforming
Circuit Notes
CN-0207, High Performance Analog MEMS Microphone’s Simple
Interface to SigmaDSP Audio Codec
CN-0262, Low Noise Analog MEMS Microphone and Preamp
with Compression and Noise Gating
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