I would like to know how to define the PSRR.
How was it measured this specification?
because it is digital output.
As you know, ADXL362 has digital output and it has a built in 12 bits ADC. Its transfer function is:
output in mV = output in LSB x (0.9 x Vs - 0.1 x Vs)/4096.
This is how we build relationship between LSB output and mV sine wave input.
Please find the test condition on page 5 of ADXL362 datasheet. To test PSRR, you can test the output with normal supply firstly, then add sine wave signal on Vs, check the output again to see how about the output response to the sine wave signal on supply.
Thank you very much for your reply.
Could you tell me about "output" meaning?
That means digital error, g error, doesn't it?
Please help my understanding.
I would like to know the impact of 'g' output by power line noise.
Thank you for very your good support.
You mean , when Vs=3.3V, the power supply noise should be under 2.8mV.
If Vs=1.6V, it should be under 1.3mV
(this supply noise is 100~1KHz sine wave under the defined test condition )
It should use LDO for power supply, shouldn't it.
For the noise requirment on the power supply, the lower, the better. Normally, we suggest customer to use LDO to power the accelerometer.
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