Datasheet ICS-40638 (TDK) - 8
| 制造商 | TDK |
| 描述 | High AOP Analog MEMS Microphone with Differential Output |
| 页数 / 页 | 14 / 8 — ICS‐40638. APPLICATIONS INFORMATION . CODEC CONNECTION . … |
| 文件格式/大小 | PDF / 391 Kb |
| 文件语言 | 英语 |
ICS‐40638. APPLICATIONS INFORMATION . CODEC CONNECTION . Figure 8. ICS‐40638 Connected to a Differential‐Input Codec
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ICS‐40638
APPLICATIONS INFORMATION CODEC CONNECTION
The ICS‐40638 output can be connected to a dedicated codec microphone input (see Figure 8) or to a high input impedance gain stage. A 0.1 µF ceramic capacitor placed close to the ICS‐40638 supply pin is used for testing and is recommended 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 μF is recommended in Figure 8 for codecs, which may have a very low input impedance at some PGA gain settings.
Figure 8. ICS‐40638 Connected to a Differential‐Input Codec
Page 8 of 14 Document Number: DS‐000281 Revision: 1.1
APPLICATIONS INFORMATION CODEC CONNECTION
The ICS‐40638 output can be connected to a dedicated codec microphone input (see Figure 8) or to a high input impedance gain stage. A 0.1 µF ceramic capacitor placed close to the ICS‐40638 supply pin is used for testing and is recommended 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 μF is recommended in Figure 8 for codecs, which may have a very low input impedance at some PGA gain settings.
Figure 8. ICS‐40638 Connected to a Differential‐Input Codec
Page 8 of 14 Document Number: DS‐000281 Revision: 1.1