Other Parts Discussed in Thread: DAC38J82
Using the LMH5401EVM in conjunction with the DAC38J82 with Rg=50 ohm, Rf=374 ohm, Ro=23 ohm, Vs(+)=2.5V, Vs(-)=-2.5V, PD=Gnd, Vcm=0.8V.
The nominal baseband input DC common-mode voltage used in the characterization of a wideband quadrature modulator with fractional-N PLL and integrated VCO is 0.45V which should be externally applied. The nominal baseband input AC voltage is 1.3Vpp differential. I have some waveforms I can show offline but when the Vcm is set to 0.8V the customer sees 0.45V on the output sinwave? How can we increase this?
Regards, John Garrett, TI-AFA