MICRF008

QwikRadio is a registered trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

August 2008

M9999-080108

General Description

The MICRF008 QwikRadio

OOK (on-off keyed) receiver IC designed for remote

wireless applications. This device is a true single-chip,

“antenna-in, data-out” device, and it is easy to implement.

MICRF008 receiver requires very few peripheral passive

components. All tunings, RF and IF, are accomplished

within the IC. Ease of use and minimal parts count

translate to cost savings and shorter time to market.

MICRF008 receiver offers a robust and low-cost solution

for high volume wireless applications.

The MICRF008 sweeps the internal local oscillator at rates

greater than the baseband data rate. This effectively

broadens the RF bandwidth of the receiver to a value

equivalent to conventional superregenerative receivers.

This allows the MICRF008 to operate with less expensive

LC transmitters without additional components or tuning,

even though the receiver topology is still superheterodyne.

In this mode the reference crystal can be replaced with a

less expensive ±0.5% ceramic resonator.

Since all post-detection (demodulator) data filtering is

provided on the MICRF008, no external IF filters are

required. One of the two internal filter bandwidths must be

externally selected based on data rate and code

modulation format.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

Complete UHF receiver on a monolithic chip

300MHz to 440MHz frequency range

Up to 4.8kbps data rate.

Automatic tuning, no manual adjustment

Very low RF antenna reradiation

CMOS logic interface for standard ICs

Low external part count

Replaces superregenerative receivers design

Manufacturability and same performance over the years

Very small PCB area required

Applications

Garage door and gate openers

Security systems

Remote appliances control

Toys

Fan and light control

_________________________________________________________________________________________________________

Typical Application

SEL0

VSS

REFOSC

ANT

CAGC

VDD

CTH

DO

C3

0.1µF

C1

1.8pF

L1

33nH

C4

2.2µF

U1

MICRF008YM

+5V

C2

4.7µF

Y1

3.36MHz

ANT1

1/8 Monopole

80mm

1

2

3

4

8

7

6

5

433.92MHz Receiver