2808 built-in AD collects sine signals

votex威

2808 built-in AD collects sine signals [Copy link]

When the 2808 built-in AD collects sinusoidal signals, there is only one sinusoidal signal input. Can one channel be used for multiple collections? Also, can the negative voltage of the converted sinusoidal signal be collected? For example, the amplitude range is -1~1v. Also, I don't understand when to connect the AD pins: ADCREFIN, ADCREFP, ADCREFM:. Can experts help me? [ This post was last edited by votex威 on 2009-11-26 12:46 ]

dobetter2008

Convert the -1~1v signal to a 0~2v signal, otherwise your AD will die.

superwangyang

The built-in AD cannot collect negative voltage. The operational amplifier adjusts the signal to above 0, as mentioned above.

votex威

Then, by subtracting the added value through software, the correct waveform can be displayed. Also, I don't understand when to connect the AD pins: ADCREFIN, ADCREFP, ADCREFM:. Can experts help me?

gaoxiao

Planning, to a recognizable reference voltage of 0~5v, the reference voltage is generally not used

votex威

Thanks to the moderator. :)

liangrongliang

I use C8051F410 to collect the amplitude of the sine signal and the effect is good

鸽子

Does the 2812 internal ADC have a built-in follower? If not, the acquisition will not be very accurate at high frequencies.