Sorry to bother you~enashjdobler

In the datasheet, I saw the differential impedance is 400 ohm. And in the following circuit, I wanna change the differential to the single end. In the evaluation board, I noticed that the impedance ratio of the following RF transformer was 2:1. Considering the match impedance is 50 ohm, the RF transformer can only transform the 400 ohm differential impedance into 200ohm not 50ohm often served as default match impedance . So is there some problems in the design? Thanks.The attachments are as follows

Along with the 2:1 balun, there are two 174 Ohm series resistors and a 140 Ohm resistor in shunt with the secondary side of the balun (the 100 Ohm side). If you combine the series resistors and shunt resistor with the 100 Ohm impedance the balun presents (transformed from the 50 Ohm primary side), you get approximately 400 Ohm differential load and match to the 400 Ohm output impedance.

Rload = 140//100 + 174 + 174 = 140*100/240 + 348 = 58 + 348 = 406 Ohm