MICRF008 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – QwikRadio™ Sweep-Mode Receiver

MICRF008
Micrel
MICRF008
QwikRadio™ Sweep-Mode Receiver
General Description
The MICRF008 QwikRadio™ UHF receiver is a single-chip
OOK (on-off keyed) receiver IC designed for remote wireless
applications. This device is a true single-chip, “antenna-in,
data-out” device, and it is easy to implement. MICRF008
receiver requires very few peripheral passive components.
All tunings, RF and IF, are accomplished within the IC. Ease
of use and minimal parts count translate to cost savings and
shorter time to market. MICRF008 receiver offers a robust
and low-cost solution for high volume wireless applications.
The MICRF008 sweeps the internal local oscillator at rates
greater than the baseband data rate. This effectively broad-
ens the RF bandwidth of the receiver to a value equivalent to
conventional superregenerative receivers. This allows the
MICRF008 to operate with less expensive LC transmitters
without additional components or tuning, even though the
receiver topology is still superheterodyne. In this mode the
reference crystal can be replaced with a less expensive
±0.5% ceramic resonator.
Since all post-detection (demodulator) data filtering is pro-
vided on the MICRF008, no external IF filters are required.
One of the two internal filter bandwidths must be externally
selected based on data rate and code modulation format.
Features
• Complete UHF receiver on a monolithic chip
• 300MHz to 440MHz frequency range
• Up to 4.8kbps data rate.
• Automatic tuning, no manual adjustment
• Very low RF antenna reradiation
• CMOS logic interface for standard ICs
• Low external part count
• Replaces superregenerative receivers design
• Manufacturability and same performance over the years
• Very small PCB area required
Applications
• Garage door and gate openers
• Security systems
• Remote appliances control
• Toys
• Fan and light control
Ordering Information
Part Number
MICRF008BM
Junction Temp. Range
–40°C to +85°C
Package
8-Pin SOIC
Typical Application
ANT1
1/8 Monopole
80mm
C1
1.8pF
L1
33nH
+5V
C3
0.1µF
U1
MICRF008BM
1 _{SEL0 REFOSC} 8
2 _ANT
CAGC ⁷
3 _VDD
VSS ⁶
C4
2.2µF
4 _CTH
DO ⁵
433.92MHz Receiver
Y1
C2 ^3.36MHz
4.7µF
QwikRadio™ is a trademark of Micrel.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
July 2003
1
MICRF008