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I use cc2530 ADC to convert analog signal ,which is a unsigned input .Now I want to Improve accuracy ,so I want to use the signed bit. I want to know that use this bit must base on that I input a signal between
-Vref and 0? Thanks !
Link to the Datasheet: http://www.ti.com/lit/swrs081
User's Guide: http://www.ti.com/lit/swru191
And Code Examples: https://www.ti.com/lit/zip/swrc135
Furthermore, here are some relevant E2E threads:
https://e2e.ti.com/support/wireless-connectivity/zigbee-and-thread/f/158/t/459403
https://e2e.ti.com/support/wireless-connectivity/zigbee-and-thread/f/158/t/305148
https://e2e.ti.com/support/wireless-connectivity/zigbee-and-thread/f/158/t/208550
YK's blog post may also be of some use: https://sunmaysky.blogspot.com/2013/12/cc2530-adc-howto-in-ti-z-stack.html
Otherwise you can refer to Z-Stack usage to monitor the battery level. Ultimately the User's Guide will provide the greatest insight on reference voltages and decimation rates (affecting ENOB).
Regards,
Ryan