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MICRF001

QwikRadio Receiver/Data Demodulator

Micrel 

MICRF001

QwikRadiotm Receiver/Data Demodulator

Advance Information

General Description

The MICRF001 is a single chip OOK (ON-OFF Keyed) Receiver

IC for remote wireless applications, employing Micrel’s latest

QwikRadiotm technology. This device is a true “antenna-in, data-

out” monolithic device. All RF and IF tuning is accomplished

automatically within the IC, which eliminates manual tuning, and

reduces production costs. Receiver functions are completely

integrated. The result is a highly reliable yet extremely low cost

solution for high volume wireless applications. Because the

MICRF001 is a true single-chip radio receiver, it is extremely

easy to apply, minimizing design and production costs, and

improving time to market.

The MICRF001 uses a novel architecture that allows the

receiver to demodulate signals over a wide RF band, which

eliminates the need for manual tuning. This also significantly

relaxes the frequency accuracy and stability requirements of the

Transmitter, allowing the MICRF001 to be compatible with both

SAW-based and LC-based transmitters. The receiver sensitivity

and selectivity are sufficient to provide low bit error rates for

decode ranges over 100 meters, equaling the performance of

other more expensive solutions.

All tuning and alignment are accomplished on-chip by a low-

cost ceramic resonator or with an externally supplied clock

reference. Initial tolerance requirements on the ceramic

resonator or external clock is a modest ±0.5%. The MICRF001

performance is insensitive to data modulation duty cycle. The

MICRF001 may be used with such coding schemes as

Manchester or 33/66% PWM.

All post-detection (demodulator) data filtering is provided on the

MICRF001, so no external filters need to be designed. Any one

of four filter bandwidths may be selected externally by the user.

Bandwidths range from 0.6kHz to 4.8kHz in binary steps

Features

• Complete UHF receiver on a monolithic chip

• Frequency range 300 to 440 MHz

• Typical range over 100 meters with monopole

antenna

• Data rates to 4.8kbps

• Automatic tuning, no manual adjustment

• No Filters or Inductors required

• Very low RF re-radiation at the antenna

• Direct CMOS logic interface to standard decoder and

microprocessor ICs

• Extremely low external part count

Applications

• Keyless Entry

• Security Systems

• Remote Fan/Light Control

• Garage Door Openers

Typical Operating Circuit

387 MHz, 1200 BAUD OOK RECEIVER

Micrel Inc. • 1849 Fortune Drive San Jose, Ca 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

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