Hi,
I’m Pooja I’ve been working with SPH0645LM4H-B for the last couple of months was purchased from Mouser Electronics. I just have a question regarding the sample rate, as per datasheet the minimum sample rate is 16kHz but I’m using SPH0645LM4H-B for 8kHz. Will this affect the component in any electrical factor or any issue may arise. Kindly let me know about this.
Hello Poojav, Welcome to the DigiKey TechForum.
The sampling rate is determined by the Clock Frequency, which is 1.024Mhz to 4.096Mhz.
So the part will be sampling at a minimum of 64KHz. If you are only using the data at 8KHz, I don’t think it would harm it. But maybe one of the engineers that monitor the TechForum, can add to this post, with their knowledge.
I assume by this you mean you are providing a clock signal with a frequency of of 512kHz to the device? Since this falls well below the minimum clock frequency specified in Table 2 of the datasheet, the performance specifications of the device cannot be guaranteed. You can’t be certain of which operating mode the device is in, whether the data it provides is valid, what frequency response to expect, etc.
The recommended approach would be to clock the device at 1024kHz to achieve the minimum sampling rate of 16kHz and simply drop every other sample (downsample by a factor of 2). Alternatively, you could utilize a different microphone that is designed to accommodate lower sampling rates. The 1428-1053-1-ND and 1428-1066-1-ND are two such options which also produce data in I2S format.