2.4-GHz CyFi™ Transceiver
Features
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2.4-GHz direct sequence spread spectrum (DSSS) radio transceiver
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Operates in the unlicensed worldwide industrial, scientific, and medical (ISM) band (2.400 GHz to 2.483 GHz)
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21-mA operating current (transmit at –5 dBm)
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Transmit power up to  4 dBm
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Receive sensitivity up to –97 dBm
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Sleep current less than 1 μA
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DSSS data rates up to 250 kbps, Gaussian frequency-shift keying (GFSK) data rate of 1 Mbps
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Low external component count
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Auto transaction sequencer (ATS) - no MCU intervention
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For more, see pdf
Functional Overview
The CYRF7936 IC is designed to implement wireless device links operating in the worldwide 2.4-GHz ISM frequency band. It is intended for systems compliant with worldwide regulations covered by ETSI EN 301 489-1 V1.41, ETSI EN 300 328-1 V1.3.1 (Europe), FCC CFR 47 Part 15 (USA and Industry Canada), and TELEC ARIB_T66_March, 2003 (Japan).
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