The EVAL-CN0522-EBZ is a 6-layer printed circuit board (PCB) that allows evaluation of the CN0522 USB-powered, 915 MHz ISM Band RF power amplifier circuit. The board is fabricated with a 3 oz./3 oz. copper cladding and IPC-4101 (or IPC-4103) laminates and bonding materials. To improve the thermal performance, multiple plated vias are used in the design, which are filled with conductive epoxy.
Designed to be used with the ADALM-PLUTO, the EVAL-CN0522-EBZ features a small form-factor with dimensions of 25.4 mm × 36.957 mm x 1.5748 mm (PCB only). The evaluation board uses standard 50 Ω SMA coaxial connectors for its RF signal path — for easy integration with RF systems, a male connector is used for the RF input and and a female connector is used for the RF output. Coplanar waveguides are used for the RF traces on the board, which have a characteristic impedance of 50 Ω. A micro-USB connector is used for the input power, allowing the evaluation to use most +5 V wall-wart power supplies available in the market.
Evaluation Kit Contents:
The RF input to the evaluation board must be connected to the male SMA connector J1.
The maximum RF input to the EVAL-CN0522-EBZ is +15 dBm. Do not use a higher input level to avoid damaging the circuit.
The RF output of the evaluation board must be connected to the female SMA connector J2.
The maximum RF output of the EVAL-CN0522-EBZ is +30 dBm. Ensure that the RF load to be driven can handle the amplified RF signal. Use an RF attenuator if necessary to avoid damage.
The evaluation board uses two LEDs to indicate its current status.
The green LED (DS1) lights up when power is present on the board, the red LED (DS2) lights up when the amplifier is disabled due to the board temperature exceeding the temperature switch trip point.
A +5 V power supply must be connected to the VCC line through the micro-USB port P1.
The typical supply current of the on-board RF amplifier is 307 mA. However, this requirement becomes much higher at higher output power values (refer to Page 12, Figure 29 on the ADL5605 datasheet). As such, it is recommended to use a power supply with a maximum current rating of at least 1 A for full functionality.
The evaluation board includes a temperature switch to disable the amplifier when the board temperature reaches a trip point.
The trip point can be set using the solder jumpers JP1 and JP2, as shown in the table below.
Due to the high thermal dissipation of RF amplifiers, the first three and last three options should not be used.