DAQ board implementation

Poh Kok Keng

Dear Sir/Madam,

My end customer want to design a DAQ board to test 7000 mosfets. The planning is to test 100 MOSFETS on each PCB board and stack up to 700 to make a 7000 mosfets tester.

Do you have any recommended reference design or recommendation on which ADC to use that is capable of measureing nano-ampere currents?

The top level concept is something like below:

Best regards, KPK

over 2 years ago

0 Tom Hendrick over 2 years ago

TI__Guru**** 182681 points

Hi KPK,

I'm not aware of any reference designs that we have for this application. What sort of conversion speed are you looking at here? Getting nano amp resolution from an 8-bit ADC will be a challenge - how do you plan on structuring the switching between MOSFETS? 10 x 10 channel ADC's? 10CH ADC + MUX?

0 Poh Kok Keng over 2 years ago

Genius 5512 points

hi Tom,

Here is some spec:

to sustain high voltage source up to 100V
able to measure all the test current @ nA range
scanning rate up to 7000 unit per minute per test.

10x 10 ch with need simulataneous read ADC signal in one shot with performance and price compromise.

0 Tom Hendrick over 2 years ago in reply to Poh Kok Keng

TI__Guru**** 182681 points

Hi PKK,

Do you have a better block diagram of the setup?

0 Poh Kok Keng over 2 years ago in reply to Tom Hendrick

Genius 5512 points

hi Tom,

Dont have block diagram, this is the best i have.thx

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DAQ board implementation