MICRF007 Datasheet, PDF (1/16 Pages) Micrel Semiconductor – QwikRadio Low-Power UHF Receiver

MICRF007
Micrel
MICRF007
QwikRadio™ Low-Power UHF Receiver
Preliminary Information
General Description
The MICRF007 is a single chip ASK/OOK (ON-OFF Keyed)
Receiver IC for remote wireless applications, employing
Micrel’s latest QwikRadio^tm technology. This device is a true
“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
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
0.5µA shutdown
170µA polled
433.92MHz:
3.0mA fully operational
0.5µA shutdown
300µA 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
Typical Application
+5V
0.047µF
MICRF007
SVESLS0 REFOSC
ANT
VDDRF
CAGC
SHUT
4.7µF
CTH
DO
Data
Output
315MHz 1200b/s On-Off Keyed Receiver
QwikRadio is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
December 2000
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MICRF007