December 2000

1

MICRF007

MICRF007

Micrel

MICRF007

QwikRadio™ Low-Power UHF Receiver

Preliminary Information

Typical Application

SEL0

VSS

REFOSC

ANT

CAGC

VDDRF

SHUT

CTH

DO

0.047

µF

Data

Output

MICRF007

4.7

µF

+5V

315MHz 1200b/s On-Off Keyed Receiver

Features

• Complete UHF receiver on a monolithic chip

• 300MHz

• Data Rates up to 2.1kbps

• Automatic tuning, no manual adjustment

• Low Power Consumption

315MHz:

1.7 mA fully operational

0.5

µA shutdown

170

µA polled

433.92MHz:

3.0mA fully operational

0.5

µA shutdown

300

µA in 10:1 polled operation

• Very low 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

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

QwikRadio is a trademark of Micrel, Inc.

General Description

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

Receiver IC for remote wireless applications, employing

“antenna-in to data-out” monolithic device. All RF and IF

tuning is accomplished 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 reciever, the

transmit frequency

must be accurately controlled, generally with a crystal or

SAW (Surface Acoustic Wave) resonator.

The MICRF007 provides two feature enhancements over the

MICRF001/011, (1) a Shutdown Mode, which may be used

for duty-cycle operation. (2) Reduced current consumption.

The MICRF007 requires a mere 1.7mA at 315MHz (3.0mA at

433.92MHz).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 set to 2.1kHz. Data rates

up to 2kbps may be used