F1423

Zero-Distortion

24

The F1423 EVkits (single ended and differential) have a number of control features available.

STBY (2 pin Header J5)

Two-pin header J5 can be used to set the part for operational or standby mode. Leaving the two J5

pins unconnected will place it in the operational mode. Connecting the two J5 pins together will pull

up the STBY pin to Vcc through R4 and place the part into the standby mode.

Band_Sel (2 pin Header J4)

Two-pin header J4 can be used to set the part for best operational performance in different RF bands.

Based on Table 2 above the Low-Band performance is best with these two J4 pins left open while the

other bands typically have these two pins shorted together.

RF Band Biasing (RBIAS1, RBIAS2, Band_Sel)

Below are 4 settings showing the recommended J4, J7, and J8 jumper connections for best linearity

performance in the different RF bands. The jumpers (shown in red below) select the RBIAS1 and

RBIAS2 resistor values along with the Band_Sel setting (see Table 2 above). Never have two shunts

installed at the same time on header J7 since this may produce excessive bias current and damage

the part.

Broad-Band

Low-Band

Mid-Band

High-Band