Re: What does the term "bandwidth" mean for the ADXL330 3-axis accelerometer?
OK, so with lower noise (since most higher frequencies were filtered out), we are able to actually successfully detect much smaller changes in the measured variable called g (acceleration due to gravity or otherwise). Is that correct?
I find this IC a bit strange and messy. I would expect this type of IC to have a digital interface so we can communicate with it via SPI, I2C or some other interface.
By the way, the Mikroe have a daughter board with this IC on it
here. If you look at schematic in Figure 3 of the user manual of this board found
here, once notices an opamp connected to this accelerometer.
Initially, I thought that the opamp must be amplifying the signal. But then I found that it is merely being used as a buffer.
(1) Why is a buffer required since the accelerometer datasheet said nothing about needing a buffer?
(2) What purpose do the 47 ohm resistors serve??