參數(shù)資料
型號(hào): EVAL-ADMP504Z-FLEX
廠商: Analog Devices Inc
文件頁(yè)數(shù): 12/13頁(yè)
文件大小: 0K
描述: EVAL BOARD FOR ADMP504
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:
已用 IC / 零件: *
主要屬性: 模擬輸出,200 歐姆阻抗
已供物品:
Data Sheet
ADMP504
Rev. A | Page 7 of 12
APPLICATIONS INFORMATION
The ADMP504 output can be connected to a dedicated codec
microphone input (see Figure 8) or to a high input impedance
gain stage (see Figure 9). A 0.1 μF ceramic capacitor placed close
to the ADMP504 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 codec’s input impedance.
A minimum value of 2.2 μF is recommended in Figure 8 because
the input impedance of the ADAU1361/ADAU1761 can be as
low as 2 kΩ at its highest PGA gain setting, which would result
in a high-pass filter corner frequency at about 37 Hz.
Figure 9 shows the ADMP504 connected to an ADA4897-1
op amp configured as a noninverting preamplifier.
10140
-0
07
OR
GND
OUTPUT
LINN
LINP
MICBIAS
CM
2.2F
MINIMUM
0.1F
VDD
Figure 8. ADMP504 Connected to the Analog Devices ADAU1761
10140
-0
08
GAIN = (R1 + R2)/R1
GND
OUTPUT
1F
MINIMUM
0.1F
10k
R1
R2
VDD
VREF
VOUT
VREF
SUPPORTING DOCUMENTS
Evaluation Board User Guide
UG-325, EVAL-ADMP504Z-FLEX: Bottom-Ported Analog
Output MEMS Microphone Evaluation Board
Circuit Note
CN-0207, High Performance Analog MEMS Microphone’s Simple
Interface to SigmaDSP Audio Codec
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
OBSOLETE
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