pxi 6602 pwm generation specs

[ugip]

Hello,

I need to generate a PWM signal and I was wondering if the PXI 6602 fulfills the requirements. I have read the user manual, but two questions remain open:

1. Output impedance of PWM source? It should be lower than 100 Ohms. Is that the case?

2. Current drive capability? It should be capable to supply at least 10mA. Is that the case?

Regards,

Udo

[John_P1]

Hi Udo,

The 6602 should have an output impedance of 75 Ohms and should be able to source 13 mA of current when driving the line high (see the NI 660x Specifications).  I hope this helps!

-John

*Edit:  Thanks for taking the time to look through the User Manual--on many of our devices including the 6602 you can find information about how the device works in the User Manual, but most numeric specifications will be found in a Detailed Specifications manual instead.

Message Edited by John P on 12-01-2009 08:10 PM

[ugip]

Hi John,

thanks for your answer. I checked the spec (link provided), but I didn't find the given figures above.

So I guess I just have to believe you. 🙂

Regards,

Udo

[John_P1]

Hi Udo,

The specs you are looking for are on the first page of the link I sent.  The current drive in particular is a bit hard to find, so I went ahead and highlighted the page for your convenience:

Best Regards,

John

[ugip]

Hi John,

thanks again. Now even a blind fellow like me could see it. 🙂

Are you sure the output impedance is correct? For me it looks like a typo. 75 kiloOhms seems to be way too high.

Especially when you look at the text in brackets. 56 kiloOhms + 19 Ohms is for sure not 75 kiloOhms.

Would you please check that?

Regards,

Udo

[John_P1 · Accepted solution]

Hi Udo,

Thanks for pointing this out--this is an error in the specs page.  It should read as follows:

Output impedance...........................75 Ω

(56 Ω from an onboard resistor and 19 Ω from the TIO ASIC)

75 kOhms is certainly way too high.  I actually overlooked the "k" when I posted my screenshot, but a Corrective Action Request has been filed to fix the mistake in the documentation.  I apologize for the mistake, I hope this post clears up any confusion. 

I guess in this case you do have to take my word for the impedance spec 🙂

Best Regards,

John

[muks]

John,

Can you post the CAR# for our reference?

[John_P1]

Hi muks,

Thanks for reminding me--the CAR# is 100647.

-John