MICRF218

3.3V, 315/433MHz Wide-IF Bandwidth ASK Receiver

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

November 2011

M9999-111111

(408) 944-0800

General Description

The MICRF218 is a 3.0V to 3.6V, 300MHz to 450MHz

ASK/OOK

super-heterodyne

receiver

with

user

selectable Intermediate Frequency (IF) Bandwidths of

550kHz or 1500kHz at 433.92MHz, making it an

excellent solution for use with low-cost SAW-based

transmitters or transmitters which use low-cost, medium-

grade (~30ppm) crystals. The device requires a single,

low-cost crystal to select the proper RF frequency,

integrated Automatic Gain Control (AGC), data slicer,

and programmable baseband filter bandwidths of

1.6kHz to 13kHz allowing the device to support bit-rates

up to 20kbps at 433.92MHz.

The MICRF218 consumes 4.0mA of supply current at

315MHz and 5.5mA of supply current at 433.92MHz.

The device also features a low-power shutdown mode

where the device consumes 1

A of supply current. The

device achieves a sensitivity of -108dBm at 1kbps. For

transmitters using higher-quality (~10ppm) crystals, the

MICRF219A/MICRF220

offer

an

IF-bandwidth

of

330kHz and a sensitivity of -110dBm at 1kbps, which

can provide better sensitivity and longer range

performance.

Features

 Fully integrated 300 to 450MHz ASK/OOK Receiver

 No external IF Filter Required

 Wide IF-Bandwidth filter supports reception of SAW

based and medium-grade (~30ppm) transmitter

 Sensitivity at 433.92MHz at 1kbps with 0.1% BER

o

-108dBm sensitivity with 550kHz IF Bandwidth

o

-106dBm sensitivity with 1500kHz IF Bandwidth

 Low-Supply Current

o

4.0mA at 315MHz

o

5.5mA at 433.92MHz

o

1µA low-power shutdown mode

 Data Rates to 10 kbps (Manchester Encoded) @

433.92 MHz

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

 60dB Analog Received Signal Strength Indicator

 16-pin QSOP (4.9mm x 6.0mm) package

Ordering Information

Part Number

Temperature Range

Package

MICRF218AYQS

–40° to +85°C

16-Pin QSOP

Application Example

+3V

C4

0.1µF

16V

C2

1.5pF 50V

ANT

PCB Pattern

C5

4.7µF

6.3V

Y1

9.8131MHz

C1

6.8pF

U1 MICRF218AYQS

1

2

3

4

5

6

7

89

10

11

12

13

14

15

16

RO1

GNDRF

ANT

GNDRF

VDD

IF_BW

SEL0

SHDN

GND

DO

SEL1

CTH

CAGC

RSSI

NC

RO2

C3

0.1µF 16V

L1

39nH

L2

68nH

DO

RSSI

IF_BW CONTROL