MICRF218

3.3V, QwikRadio

QwikRadio is a registered trademark of Micrel, Inc.

MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

September 2007

M9999-090607

(408) 944-0800

General Description

Micrel’s MICRF218 is the world’s first integrated ASK /

OOK receiver with selectable dual IF bandwidths for

300~450 MHz operation.

The receiver architecture is

super-heterodyne. The MICRF218 has fully integrated

IF section with image rejection to bring performance,

simplicity and ease of implementation to the receiver

portion of RF actuation.

The MICRF218 is a true RF in, data out receiver.

IF

filter and image rejection functions are built-in. Dual IF

bandwidths enable the MICRF218 to capture signals

from either high performance or low cost transmitters.

In addition, all post-detection data filtering is provided on

the MICRF218. The user has a choice of four filter

bandwidths that may be selected externally in binary

steps, from 1.25 kHz to 10 kHz. The user only needs to

program the device with a set of easily determined

values, based upon data rate, code modulation format,

and desired duty-cycle operation. The MICRF218 has a

shutdown control for duty-cycle operation to reduce

average current consumption.

It has analog RSSI

output, indicating the strength of incoming signal.

The device is unique for its ability to “escape” from a

jamming source and move to an alternate frequency.

Dual IF bandwidths function plus fast response time

provide

easy

implementation

of

dual

frequency

operations. It can accommodate two reference crystals

with the use of an external switch.

Once the system

detects a strong jamming signal on one frequency, the

MICRF218 can switch to another frequency via a

switching crystal.

This is the ideal receiver for “Jam

Avoidance”.

Features

• Complete receiver on a chip

• 300 MHz to 450 MHz frequency range

• Selectable IF frequency and bandwidth

• -108 dBm sensitivity, 550kHz IF BW, 1.0 Kbps BER

10 E-2 @ 433.92MHz

• -106 dBm sensitivity, 1500kHz IF BW, 1.0 Kbps BER

10 E-2 @ 433.92MHz

• Built-in Image Rejection Mixer

• Low Power, 4 mA @ 315 MHz, continuous on

• Data Rates to 10 kbps (Manchester Encoded) @

433.92 MHz

• Duty Cycling Capable > 100:1 (shut down mode)

• Analog RSSI Output

• No IF filter required

• Excellent selectivity and noise rejection

• Low external part count

Ordering Information

Part Number

Temperature Range

Package

MICRF218AYQS

–40° to +85°C

16-Pin QSOP