MICRF221 Series

Catalog

850MHZ TO 950MHZ, 3.0V TO 3.6V, 9MA, 10KBPS ASK RECDEIVER WITH AUTO-POLL AND RSS 16 QSOP 3.90MM(.150IN) TUBE ROHS COMPLIANT: YES

Part	Supplier Device Package	Operating Temperature [Max]	Operating Temperature [Min]	Frequency [Min]	Frequency [Max]	Current - Receiving	Modulation or Protocol	Antenna Connector	Voltage - Supply [Max]	Voltage - Supply [Min]	Data Interface	Mounting Type	Sensitivity	Data Rate (Max) [Max]	Package / Case	Package / Case	Package / Case
Microchip Technology MICRF221AYQS	16-QSOP	85 °C	-40 °C	850 MHz	950 MHz	9.3 mA	ASK OOK	PCB Surface Mount	3.6 V	3 V	PCB Surface Mount	Surface Mount	-109 dBm	10 kbps	0.154 in	16-SSOP	3.9 mm

Catalog

Key Features

• + Complete receiver on a chip

• + -109dBm sensitivity, 1kbps, and BER 10-2

• + Image rejection mixer

• + 850MHz to 950MHz frequency range

• + Low power, 9mA @ 868MHz, 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 external part count

• + Additional functions programmed through serial interface

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 RSSI output. The MICRF221 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 ideal for low and ultra-low power applications, such as RKE and RFID All post-detection data filtering is provided on the MICRF221 receiver. Any one of four filter bandwidths may be selected externally by the user in binary steps, from 1.25kHz to 10kHz. The user needs only to program the device with a set of easily determined values based on data rate, code modulation format, and desired duty-cycle operation.