05-01-2010 11:13 PM
Hi,
Has anyone generated a differential signal (sine wave with 1Vpp) using NI PCIe-6521 hardware? I like to use signal to test a DAC for INL/DNL. Sample code or pointers would greatly be appriciated. Thanks.
05-02-2010 09:07 AM
05-03-2010 12:49 PM
Hi Dennis,
Thanks for responing. I checked and the device does have two 16 bit analog output.
16-Bit, 1.25 MS/s (Max), 1 MS/s (Scanning), 16 Analog Inputs
05-03-2010 12:50 PM
Dennis,
My mistake, I transpose the digits. Apologies.
05-03-2010 10:21 PM
05-04-2010 03:44 AM
If use both channels, one with the inverted signal you get a differential output with AGND (0V) midpoint.
If you need a free floating differential output use a transformer, a 5B module or use a FDA (fully differential amplifier) for example described in this TI appnote page 19.
05-04-2010 04:07 AM
05-04-2010 11:30 AM
Henrik, Dennis,
Thank you for the excellent suggestion. I will give it a try.