How much amplitude is the external crystal of ADAS1000 after the chip is work normally?
The amplitude of my ADAS1000's external crystal is only about 300mV.
IS IT right?
THANK YOU EVERY MUCH!
Hello 风玲 杜,
Thanks for your question.
See attached plot from my board - I expect the crystal should be sitting around 450mV.
Are you using your own board or ADI evaluation board?
Thank you for your attention to my question。
I use my own board.You see it is only 297mV.
First, I think the distance between my crystal and ADAS1000 is a little far.It is 10 millimeter.Is it the reason make crystal sit around 300mV.
Second,The circuit diagram of the crystal is shown below.Actually I don't add C29 and C30.Because if add the two capacitor,the amplitude of crystal is lower than 300mV,it is only 260mV.
Can you provide part number of the crystal you are using?
Ideally the crystal will be close to the pins, but this is not always easy to achieve.
On my evaluation board, the crystal is also approx. 10mm distance from the pins, this was because I used a socket on the board initially so there was a keep out area.