MICRF007_04 Datasheet, PDF (1/13 Pages) Micrel Semiconductor – QwikRadio® Low-Power UHF Receiver

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 [phone] • fax + 1 [phone] • http://www.micrel.com
February 17, 2005
1
M9999-021705