Murata’s LFD21 is a dual matching filter designed specifically for sub-GHz wireless applications using the CC112x series of low-power transceivers from Texas Instruments.
Believed to be the world’s smallest filter available, measuring just 2,0 x 1,25 x 0,7 mm, this miniature LTCC (low temperature co-fired ceramic) surface mounted filter takes up less board space than a discrete design and has been approved by Texas Instruments for use with their CC112x transceivers. Compared with a traditional inductor and capacitor design, the filter module replaces more than 10 discrete components.
The LFD21868MMF has a nominal operating frequency centred on 891,50 MHz ± 23,50 MHz and can accommodate up to 500 mW transmit power output.
Insertion loss is typically better than 1,73 dB transmit and 2,67 dB receive. The antenna port matches to a nominal impedance of 50 Ω.
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