AN4111 Datasheet, PDF (1/17 Pages) STMicroelectronics – The STEVAL-ILL044V1 demonstration board showcases

AN4111
Application note
BAL-NRF01D3 matched balun with integrated harmonics filter for
Nordic Semiconductor ultralow power transceivers
Introduction
The nRF24LE1, nRF24AP2, nRF51422 and nRF51822 QFN from Nordic Semiconductor
are 2.45 GHz combo chips with an ultralow power transceiver.
The BAL-NRF01D3 from STMicroelectronics is an ultra miniature balun for which the
matching impedance has been customized for the nRF24LE1 QFN-32, nRF24AP2-1CH,
nRF24AP2-8CH, nRF51422-QFAA, and nRF51822-QFAA Nordic Semiconductor circuits.
The BAL-NRF01D3 integrates matching network and harmonics filters. It uses
STMicroelectronics’ IPD technology on non-conductive glass substrate which optimizes RF
performance.
Compared to traditional discrete solutions (Figure 3), STMicroelectronics BAL-NRF01D3
decreases the BOM count by 80%, from 5 components to 1 component (Figure 4). This
results in a lower system cost solution.
The BAL-NRF01D3 has been tested and approved by Nordic Semiconductor in the
nRF2723 nRFgo module (from the nRFgo nRF24LE1 QFN-32 pins development kit) and the
nRF2752 nRFgo module (from the nRFgo nRF51x22 Developer Preview kit). The
BAL-NRF01D3 demonstrates a higher system performance compared to traditional
solutions. This document presents the test and performance results.
June 2013
DocID023194 Rev4
1/17
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