ADC analog

nishanth p

Other Parts Discussed in Thread: TMS320F28335

Hi...

when 'm injecting DC signal to the ADC pin..it is reading satisfactorily.

But wen i injected an A.C signal..it is not reading properly...? Moreover..it is showing only 10% of the actual value...

Function generator is working properly..

Help me in this regard.

over 14 years ago

0 Devin Cottier over 14 years ago

TI__Guru 60865 points

Hi nishanth,

What device are you using? Are you using a controlCARD or other TI EVM or are you using a custom board? What is the frequency and shape of the AC signal? What is your sampling rate?

0 nishanth p over 14 years ago in reply to Devin Cottier

Intellectual 395 points

Devin,

It is TMS320F28335 control card. we are working on evaluation board. Board is also supplied by TI.

Signal injected is sinusoidal of amplitude 1 volt with freq 200Hz.

sampling rate is 6.4kHz. I configured like this.

ConfigCpuTimer(&CpuTimer0,150,157)

Basically am aiming at 32samples/ cycle

0 Devin Cottier over 14 years ago in reply to nishanth p

TI__Guru 60865 points

Does the signal ever drop below 0V? Can you send a snippet of how the ADC is initialized?

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ADC analog