MICRF007BM View Datasheet(PDF) - Micrel

Part Name

Description

Manufacturer

MICRF007BM

QwikRadio® Low-Power UHF Receiver

Micrel 

MICRF007

Micrel

MICRF007

QwikRadio® Low-Power UHF Receiver

General Description

The MICRF007 is a single chip, ON-OFF Keyed (ASK/OOK)

Receiver for remote wireless applications, employing Micrel’s

latest QwikRadio® technology. This device is a true “antenna-in

to data-out” monolithic device. All RF and IF tuning is accom-

plished automatically within the IC, which eliminates manual

tuning, and reduces production costs. The result is a highly

reliable yet extremely low cost solution. The MICRF007 is an

enhanced version of the MICRF002 and MICRF011.

The MICRF007 is a conventional superhetrodyne receiver,

with an (internal) Local oscillator fixed at a single frequency

based on an external reference crystal or clock. As with any

conventional superhetrodyne receiver, the companion trans-

mitter’s frequency must be accurately controlled, generally

with a crystal or SAW (surface acoustic wave) resonator.

The MICRF007 provides two enhancements over the MI-

CRF001/011: (1) a Shutdown Mode, which may be used for

duty-cycle operation, and (2) reduced current consumption.

The MICRF007 requires a mere 2.3mA at 315MHz (3.8mA

at 433.92MHz) when fully operational. These features make

the MICRF007 ideal for low and ultra-low power applications,

such as RKE and RFID.

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

the MICRF007, so no external baseband filters are required.

The demodulator filter bandwidth is fixed at 2.5kHz. Data

rates up to 3.2kbps NRZ may be used.

All support documentation can be found on Micrel’s web site

at www.micrel.com.

Features

QwikRadio®

• Complete UHF receiver on a monolithic chip

• 300MHz to 440MHz

• Data rates up to 3.2kbps NRZ

• Automatic tuning, no manual adjustment

• Low power consumption

– 315MHz:

2.3 mA fully operational

0.5µA shutdown

230µA polled at a 10:1 duty cycle ratio

– 433.92MHz:

3.8mA fully operational

0.5µA shutdown

380µA polled at a 10:1 duty cycle ratio

• Virtually no RF re-radiation at the antenna

• CMOS logic interface to standard decoder and micro-

processor ICs

• Extremely low external part count

• No filters or inductors required

Applications

• Automotive remote keyless entry (RKE)

• Long range RF identification

• Remote fan and light control

• Garage door and gate openers

Typical Application

50Ω�Ant

1.8pF

56nH

MICRF007

VSS REFOSC

4.8970MHz

ANT

CAGC

+5V

2.2µF

VDD

SHUT

CTH

0.039µF

DO

Data

Output

315MHz 1200b/s On-Off Keyed Receiver

QwikRadio is a trademark of Micrel, Inc. The QwikRadio ICs were developed under a partnership agreement with AIT of Orlando, Florida.

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

February 17, 2005

1

M9999-021705

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