ADL7078

The ADL7078-EVALZ is a 2-layer printed circuit board (PCB) fabricated from 10 mil thick, Rogers 4350B, and copper clad.

The RFIN and RFOUT ports on the ADL7078-EVALZ are populated with 2.9 mm, female coaxial connectors, and the corresponding RF traces have a 50 Ω characteristic impedance. The ADL7078-EVALZ is populated with components suitable for use over the entire −40°C to +85°C operating temperature range.

To calibrate board trace losses, a through calibration path, THRUCAL, is provided between the J1 and J2 connectors. J1 and J2 must be populated with RF connectors to use the through calibration path. For the through calibration path performance, see Table 1 and Figure 4 in the user guide.

Access the ADL7078-EVALZ ground path and the VDD pin through the surface-mount technology (SMT) test point connectors, GND, and VDD. A supplementary test point for VBIAS is included for simple access on the RBIAS pin (for the test point locations, see Figure 6) in the user guide.

The RF traces on the ADL7078-EVALZ are 50 Ω, grounded, coplanar waveguide. The package ground leads and the exposed pads connect directly to the ground plane. Multiple vias connect the top and bottom ground planes with particular focus on the area directly beneath the ground paddle to provide adequate electrical conduction and thermal conduction.

The power-supply decoupling capacitors on the ADL7078-EVALZ represent the configuration used to characterize and qualify the device.