MICRF103 Datasheet, PDF (1/7 Pages) Micrel Semiconductor – QwikRadio UHF ASK Transmitter

MICRF103
Micrel
MICRF103
QwikRadio™ UHF ASK Transmitter
Final
General Description
The MICRF103 is a single chip Transmitter IC for remote
wireless applications. The device employs Micrel’s latest
QwikRadio™ technology. This device is a true ”data-in,
antenna-out” monolithic device. All antenna 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 for high volume
wireless applications. Because the MICRF103 is a true
single-chip radio transmitter, it is easy to apply, minimizing
design and production costs, and improving time to market.
The MICRF103 uses a novel architecture where the external
antenna is tuned by the internal UHF synthesizer. This
transmitter is designed to comply worldwide UHF unlicensed
band international radio regulations. The IC is compatible
with virtually all ASK/OOK (Amplitude Shift Keying/On-Off
Keyed) UHF receiver types from wide-band super-regenera-
tive radios to narrow-band, high performance super-hetero-
dyne receivers. The transmitter is designed to work with
transmitter data rates up to 115k bits per second.
The automatic tuning in conjunction with an external resistor,
insures that the transmitter output power stays constant at
maximum regulatory transmit power limits for the life of the
battery.
When coupled with Micrel’s family of QwikRadio™ receivers,
the MICRF103 provides the lowest cost and most reliable
remote actuator and RF link system available.
Features
• Complete UHF transmitter on a monolithic chip
• Frequency range 800MHz to 1GHz
• Data rates to 115kbps
• Automatic antenna alignment, no manual adjustment
• Low external part count
• Low standby current <1µA
Applications
• Remote keyless entry systems (RKE)
• Remote fan/light control
• Garage door opener transmitters
• Remote sensor data links
Ordering Information
Part Number
MICRF103BM
Temperature Range
–40°C to +85°C
Package
8-Pin SOIC
Typical Application
+5V
4.7µF
0.1µF
RP1
100k
RP2
6.8k
Y1
MICRF103
PC
VDD
ASK
ANTP
VSS
ANTM
REFOSC STBY
+5V
Note: Example for 868MHz
ASK DATA INPUT
8.2pF
1.0pF
27nH
100pF
10nH
1.0pF
100k
27nH
Figure 1
SAW Filter
50Ω
Monopole
PCB Antenna
QwikRadio is a trademark of Micrel, Inc. The QwikRadio ICs were developed under a partnership agreement with AIT of Orlando, Florida.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
June 2002
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MICRF103