Questions about measuring current DAC

[yen]

Dear all,
I want to measure my current dac. I have some question.
1.How do I measure my INL and DNL using multimeter?
Because my current dac has 12 bits and 500MHz. Too many points.
How do I measure INL and DNL by using multimeter?
Or if you have some good method , please tell me detail. Thanks.
2.If I want to measure SFDR, how do I generate my patterns?
I want to my output is like sine wave. How do I do ?
if you have some good method , please tell me detail. Thanks.
3.Do you think how do I do about my PCB for my inputs or outputs.
Do I need buffer or diodes?
My outputs connect 50 ohm. How about my clk?
If you have some good method , please tell me detail. Thanks.
I never measure dac. Please tell me detail. If you have any data, please tell me.
Thanks.

 

[waosai]

Re: About measure dac

I have the same trouble with you!
Thinking.....

 

[Vamsi Mocherla]

About measure dac

12 bit resolution, which is 4096 points and multimeter?? No way man. You need to actually use a high resolution current meters or else, you can actually use an external amplifier stage of atleast a gain of 4, on the PCB in order to get the effective measured resolution to 10 bits. Then you can use a multimeter.

For SFDR, you need to model a sinewave. This modelling can be done using a FPGA board to generate a vector of 12 bits for sine wave generation. The link for the code for FPGA is at https://www.doulos.com/knowhow/vhdl_designers_guide/models/sine_wave_generator/

 

[yen]

Re: About measure dac

12 bit resolution, which is 4096 points and multimeter?? No way man. You need to actually use a high resolution current meters or else, you can actually use an external amplifier stage of atleast a gain of 4, on the PCB in order to get the effective measured resolution to 10 bits. Then you can use a multimeter.
If my dac's outputs connect 50 ohm, how do I do? I will measure voltage.
Do I choose oscilloscope , multimeter or others? Is oscilloscope accurate? Why do I use external amplifier ? Can you tell me detail ? thanks.

For SFDR, you need to model a sinewave. This modelling can be done using a FPGA board to generate a vector of 12 bits for sine wave generation. The link for the code for FPGA is at h**p://www.doulos.com/knowhow/vhdl_designers_guide/models/sine_wave_generator/