Microchip | MICRF221AYQS-TR

Micrel's QwikRadio® products are a family of ASK/OOK (amplitude shift keyed/on-off-keyed), highly integrated single-chip RF ICs.

The receivers are true "antenna-in, data-out" devices and the transmitter is an equivalent "data-in, antenna-out" part. Both the transmitter and receivers require no hand-tweaking with trimmer capacitors, as all tuning is performed automatically on-board the devices.

QwikRadio® offers the lowest overall parts-count of any ASK/OOK receivers and transmitters on the market. They are ideal for applications with ranges below 300 feet and data rates below 10Kbps, like handheld controllers and keyFOBs.  For longer ranges and higher data rates, check out our RadioWire ® products.

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 1.25 kHz to 10 kHz. 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.