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| 型号： | ADMP504ACEZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | MIC MEMS OMNI-DIR ANALOG 3LGA |
| 标准包装： | 1 |
| 系列： | ADMP504 |
| 类型： | MEMS（硅） |
| 输出类型： | 模拟 |
| 方向： | 全向 |
| 频率范围： | 100Hz ~ 20kHz |
| 灵敏度： | -38dB ±3dB |
| 信噪比： | 65dB |
| 阻抗： | 200 欧姆 |
| 电压 - 额定： | 1.8 ~ 3.3V |
| 电流 - 电源： | 225µA |
| 端口位置： | 底部 |
| 密封等级： | 无 |
| 端子： | 表面贴装型 |
| 尺寸/尺寸： | 3.35mm L x 2.50mm W |
| 高度（最大）： | 0.98mm |
| 形状： | 矩形 |
| 包装： | 标准包装 |
| 其它名称： | ADMP504ACEZ-RL7DKR |
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.
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
or ADAU1361 Codec
10140
-0
08
GAIN = (R1 + R2)/R1
GND
OUTPUT
1F
MINIMUM
0.1F
10k
R1
R2
VDD
VREF
VOUT
VREF
Figure 9. ADMP504 Connected to the ADA4897-1 Op Amp
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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