DS1072PP1

9

CS7250B

5 Applications Information

5 Applications Information

Cirrus Logic provides a range of audio codecs incorporating a digital microphone input interface; these support direct

connection to digital microphones such as the CS7250B.

Further information on Cirrus Logic audio codecs is provided in the respective product data sheet, which is available from

the Cirrus Logic website

5.1 Important Assembly Guidelines

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Do not put a vacuum over the port hole of the microphone. Placing a vacuum over the port hole can damage the

device.

•

Do not board wash the microphone after a reflow process. Board washing and the associated cleaning agents can

damage the device.

•

Do not expose to ultrasonic cleaning methods.

•

Do not use a vapor phase reflow process. The vapor can damage the device.

•

Please refer to application note WAN0273 MEMS Mic Assembly and Handling Guidelines for further assembly and

handling guidelines.

5.2 PCB Land Pattern and Paste Stencil

The recommended PCB land pattern and paste stencil pattern for the CS7250B microphone are shown in Fig. 5-1 and

Fig. 5-2 respectively.

See also application note WAN0284 General Design Considerations for MEMS Microphones for further details of PCB

footprint design. Full definition of the package dimensions is provided in Section 6.

The recommended PCB land pattern is shown in Fig. 5-1.

Figure 5-1. PCB Land Pattern, Top View