Using a Johanson 2450BM14E0007 Impedance-Matched, Integrated Filter Balun with the ADF7241 and ADF7242
This document details the use and performance achieved by combining the Johanson Technology 2450BM14E0007 impedance-matched filter balun with the ADF7241 or ADF7242 2.4 GHz RF transceivers. The balun is designed to reduce the RF front-end component count and layout space while effectively attenuating harmonic emissions.
The note provides typical performance data, including Tx output power and harmonic attenuation levels. It also includes evaluation board layout guidelines, specifically recommending the EVAL-ADF724xDB3Z layout for optimum performance, and presents a schematic for the RF board.
| Frequency | 2400 MHz to 2500 MHz |
|---|---|
| Unbalanced Port Impedance | 50 Ohms |
| Insertion Loss | 1.5 dB max. |
| Return Loss | 9.5 dB min. |
| Phase Difference | 180° ± 10° |
| Amplitude Difference | 2.0 dB max. |
| Operating Temperature | -40 to +85°C |
| Tx Output Power | 3 dBm |
The balun is compatible with the ADF7241 or ADF7242 2.4 GHz RF transceivers.
It is recommended to follow the EVAL-ADF724xDB3Z layout as closely as possible.
The maximum insertion loss is 1.5 dB.