ADXL335 - how to get a sampling rate of 1000Hz?

Sensors IMU & Motion
1

Hi,

I am currently working on a project where I am using the SparkFun ADXL335’s to measure acceleration data. For the project I would like to have a sampling rate of 1000Hz, which means that I would like to take 1000 samples a second. The bandwidth of the ADXL335 is set to the standard 50Hz with the 0.1uF capacitors on the XYZ outputs. However, in the datasheet I read something about changing capacitors to get other bandwidths. Do I need to replace the existing capacitors to 0.01uF ones to get a bandwidth of 500Hz and to be able to reach the 1000Hz sampling rate ? (bandwidth = 0.5*fs). Or is there another way to get 1000 Hz as sampling rate?

Really looking forward to hear your thoughts on the matter. I already appreciate your time!

Kind regards, Valerie

2

Hi Valerie.

Yes, you would need to remove the existing capacitors from the board and replace them with new lower value capacitors. Page 11 on the [data sheet has the details on what size capacitors to use.

The attached photo shows the locations of the three capacitors that would need changing.

09269-02.jpg
09269-02.jpg895×738 103 KB
](https://www.sparkfun.com/datasheets/Components/SMD/adxl335.pdf)