The ADL8122-EVALZ and ADL8122-EVAL1Z are 4-layer printed circuit
boards (PCBs) fabricated from 0.254 mm (10 mil) thick, Rogers
4350B and Isola 370HR, copper clad, forming a nominal thickness
of 1.63 mm (64 mils). The ADL8122-EVALZ was designed to support
operation from 10 MHz to 10 GHz, while the ADL8122-EVAL1Z
was designed to extend frequency operation down to 10 kHz.
The ADL8122-EVAL1Z still operates up to 10 GHz. The RFIN and
RFOUT ports on the ADL8122-EVALZ and ADL8122-EVAL1Z are
populated with Subminiature A (SMA), female coaxial connectors.
The ADL8122-EVALZ and ADL8122-EVAL1Z are populated with
components suitable for use over the entire −55°C to +125°C
operating temperature range.
To calibrate out board trace losses, a through calibration path is
provided between the J1 and J2 connectors. J1 and J2 must be
populated with RF connectors to use the through calibration path.
Refer to Figure 11 and Table 1 for the through calibration path
performance for both the ADL8122-EVALZ and ADL8122-EVAL1Z.
Access the ADL8122-EVALZ and ADL8122-EVAL1Z ground and
drain voltage through the surface-mount technology (SMT) test
point connectors, GND and VDD. A supplementary test point for
VRBIAS is included for simple access on the RBIAS pin (see Figure
12 and Figure 14 for the test point locations).
The RF traces on the ADL8122-EVALZ and ADL8122-EVAL1Z are
50 Ω, grounded, coplanar waveguide. The package ground leads
and the exposed pad 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 ADL8122-EVALZ
and ADL8122-EVAL1Z represent the configuration used to characterize
and qualify the device.
For full details on the ADL8122, see the ADL8122 data sheet,
which must be consulted in conjunction with this user guide when
using the ADL8122-EVALZ and ADL8122-EVAL1Z.
