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General Description
The MICRF221 is a third generation QwikRadio® receiver, offering all the benefits of Micrel’s earlier QwikRadio® products with significant improvements, including: enhanced sensitivity, automatic duty-cycle feature and RSSl output.
The MICRF221, Figure 1, is a super-heterodyne receiver, designed for OOK and ASK modulation. The down-conversion mixer also provides image rejection.
The MICRF221 receiver provides a SLEEP Mode for duty-cycle operation and an enhanced, customer programmable”WAKE”function. These features are further combined into a wholly integrated ”self-polling” scheme that is ideaI for Iow and ultra-low power
Applications, such as RKE and RFID
MICRF221 receiver. Any one of four filter bandwidts may be selected externally by the user in binary steps, from 1.25 kHz to 10 kHz. The user needs onIy to program the device with a set of easily determined values based on data rate.code modulation format, and desired duty-cycle operation.
Features
•  Complete Receiver on a Chip
•  -109dBm sensitivity, 1 kbps and BER 10E-02
•  Image Rejection Mixer
•  850 MHz to 950 MHz frequency range
•  Low Power, 9mA @ 868 MHz, continuous on
•  Data Rates to 10kbps(Manchester Encoded)
•  Auto polling(sleep mode, current<0.1 mA)
•  Analog RSSI Output
•  Programmable “Low Sensitivity" mode
•  No IF filter required
•  Excellent selectivity and noise rejection
•  Low extemaI part count
•  Additional Functions Programmed through serial interface
Ordering Information
Part Number TemIperature Range Package
MICRF221AYQS -40°to+105℃ 16-Pin QSOP