Looking for a device that can measure small capacitance signal (0-10 pF)

Hongliang Qian

Other Parts Discussed in Thread: FDC2214, FDC2212, FDC1004, FDC2214EVM, FDC1004EVM, FDC1004QEVM, FDC2114EVM

Hello,

My major is thermal science and I am not very familiar to electrical knowledge. I am looking for a device that can measure small capacitance and could you please help tell me which device is suitable? Thank you in advance!

Here are some details:

Measure capacitance range: 0-10 pF;

Eliminated the effects of all stray capacitance including those of switches;

Low baseline drift, maybe have a differential structure;

The frequency near 1-2 MHz (we want to measure small capacitance and eliminate the influence of conductivity of structures);

High resolution: 0.001 pF

Could you please give us some suggestions about choosing a suitable device? Is FDC2212, FDC2214 or FDC1004 suitable for us? Thank you in advance!

over 8 years ago

0 Rachel Liao over 8 years ago

TI__Expert 6480 points

Hi Hongliang,

The FDC221x should fit your specifications. Depending on how many channels you need, you can choose between the FDC2212 (2-channel) or the FDC2214 (4-channel).

Thanks,
Rachel

0 Hongliang Qian over 8 years ago in reply to Rachel Liao

Prodigy 210 points

Hi Rachel,

I really appreciate your help! I am sorry but I am really just a beginner in electrical area and not familiar to relative knowledge. May I ask you some questions? Thank you in advance.

I find the Input Range (Typ) (pF) of FDC221X is 250000, which is much higher than 10 pF. Is it better to use FDC1004?
I want to buy an EVM, but I am still struggling among the following selections: FDC2214EVM, FDC2114EVM, FDC1004EVM or FDC1004QEVM. Could you please give me more instructions?

Thank you a lot!

Sincerely,

Hongliang Qian

0 Rachel Liao over 8 years ago in reply to Hongliang Qian

TI__Expert 6480 points

Hi Hongliang,

I would go with the FDC2214EVM. This is our highest resolution part and should be able to measure 0-10pF with no problems.

Thanks,
Rachel

0 Hongliang Qian over 8 years ago in reply to Rachel Liao

Prodigy 210 points

Thank you Rachel!

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Looking for a device that can measure small capacitance signal (0-10 pF)