Nordic sampling nRF21540 RF Front End Module

Nordic sampling nRF21540 RF Front End Module

By eeNews Europe

The nRF21540 was designed to complement the company’s nRF52 and nRF53 Series multiprotocol SoCs. The device’s PA has a highly adjustable TX power boost up to +21 dBm, with the LNA providing +13 dB RX gain. It’s low noise figure (NF) of 2.5 dB ensures increased RX sensitivity for Nordic’s Bluetooth 5/Bluetooth LE, Thread, Zigbee, and 2.4GHz RF low power wireless solutions. When used with an nRF52840 SoC running Bluetooth LE at 1 Mbps, the nRF21540 improves the RX sensitivity by 5 dBm, raising the connection link budget by 18 dBm. For devices with less than +8 dBm TX power on-chip, the improvements are even larger.

The nRF21540 connects to the SoC’s antenna output and offers two additional antenna ports to enable antenna diversity features. The device’s gain control, antenna switching, and power modes are controlled via GPIO or SPI or a combination of both.

Operating from a 1.7 to 3.6 V input supply range, the nRF21540 offers power numbers of 115 mA at TX tuned to +20 dBm, 4.1 mA in RX mode, and 30 nA in power down mode. The device is qualified across a -40 to 105°C temperature range. The device comes in a 4×4 mm QFN16 package. Development boards are available to allow developers to assess RF FEM performance.

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