JAJSDN8C March 2017 – April 2019 LMX2594
The RF output buffer type is open collector and requires an external pullup to Vcc. This component may be a 50-Ω resistor to target 50-Ω output impedance match, or an inductor for higher output power at the expense of the output impedance being far from 50 Ω. If inductor is used, it is recommended to follow with resistive pad for better impedance matching. The current to the output buffer increases for states 0 to 31 and then again from states 48 to 63. States 32 to 47 are redundant and mimic states 16 to 31. If using a resistor, limit the OUTx_PWR setting to 50. Higher settings may actually reduce power due to the voltage drop across the resistor.
|HIGHEST POWER||LOWEST NOISE FLOOR|
|10 MHz ≤ fOUT < 13.3 GHz||OUTx_PWR = 50||OUTx_PWR = 50||-|
|13.3 GHz ≤ fOUT ≤ 14.3 GHz||OUTx_PWR = 15||OUTx_PWR = 15||TI recommends to set OUTx_PWR ≤ 15 to avoid the power drop at hot temperature.|
|14.3 GHz < fOUT ≤ 15 GHz||OUTx_PWR = 31||OUTx_PWR = 20||-|