Spice model behavior for ADA4930

Question

Hi, I'm running simulation for ADA4930 model already available on LTSPICE (XVII). The purpose is to feed differential output to ADC, AD9250, that supplies the Vocm of 0.9V. 
 The scheme is just single input sinus of 2Vpp, 5V supply, 0.9Vocm, gain G=1 with Rf and Rg = 301ohm, and no input impedance matching for now in order to simplify the analysis. I get the following :

I got the following, in red Vin=2Vpp, blue Vout+ and in green Vout-. 
 
 I don't understand why Vout+ and Vout- are clipped at Vout+min = 0.6V and Vout-max = 1.2V. The output range from the datasheet is well between the 0,18V to 3.38V output voltage min and max voltages recommended, Vpp max is 2V, and Vocm must be between 0.3 and 2.8V. 
 So to me here everything should be ok, why are these outputs clipped ? 
 
 Thanks

GLADION · Accepted Answer

Hi Rleduc , 
 Good day. I was verifying the model in the LTSpice and it seems that there was an inaccuracy with it. You can try to use the model of ADA4930 which is available in the ADA4930-1 webpage ( https://www.analog.com/en/products/ada4930-1.html ). I tried to verify the circuit using this model and it works fine: 
 With regards to the model found on LTSpice, I'll try to coordinate it with the team. Hope this helps. 
 Regards, Gilbeys)

Electronic Design Services - PartnerZone

Products Mentioned

Spice model behavior for ADA4930