Table of Contents
Advertisement
Quick Links
MICRF102
General Description
The MICRF102 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 MICRF102 is a true
single-chip radio transmitter, it is easy to apply, minimizing
design and production costs, and improving time to market.
The MICRF102 uses a novel architecture where the external
loop antenna is tuned to the internal UHF synthesizer. This
transmitter is designed to comply worldwide UHF unlicensed
band intentional radiator 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 from 100 to 20k bits per second.
The automatic tuning in conjunction with the external resistor,
insures that the transmitter output power stays constant for
the life of the battery.
When coupled with Micrel's family of QwikRadio™ receivers,
the MICRF102 provides the lowest cost and most reliable
remote actuator and RF link system available.
Typical Application
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 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
September 2002
+5V
4.7µF
MICRF102
RP1
100k
0.1µF
PC
VDD
ANTP
RP2
6.8k
VSS
ANTM
REFOSC
STBY
Y1
+5V
QwikRadio™ UHF ASK Transmitter
Features
• Complete UHF transmitter on a monolithic chip
• Frequency range 300MHz to 470MHz
• Data rates to 20kbps
• Automatic antenna alignment, no manual adjustment
• Low external part count
• Low standby current <0.04µA
Applications
• Remote Keyless Entry Systems (RKE)
• Remote Fan/Light Control
• Garage Door Opener Transmitters
• Remote Sensor Data Links
Ordering Information
Part Number
MICRF102BM
ASK DATA INPUT
ASK
ANTENNA
(PCB TRACE)
100k
Figure 1
1
MICRF102
Final Information
Temperature Range
–0°C to +85°C
LOOP
Micrel
Package
8-Pin SOIC
MICRF102
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for Micrel QwikRadio MICRF102
Summary of Contents for Micrel QwikRadio MICRF102
-
Page 1: General Description
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 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com... - Page 2 MICRF102 Micrel Pin Configuration 8 ASK ANTP ANTM REFOSC STBY MICRF102BM Pin Description Pin Number Pin Name Pin Function Power Control Input. The voltage at this pin should be set between 0.15V to 0.35V for normal operation. Positive power supply input for the IC.
-
Page 3: Electrical Characteristics
MICRF102 Micrel Absolute Maximum Ratings Operating Ratings (Note 1) (Note 2) Supply Voltage(V ) ............. +6V Supply Voltage (V ) ........4.75V to 5.5V Voltage on I/O Pins ......V –0.3 to V +0.3 Maximum Supply Ripple Voltage ....... 10mV Storage Temperature Range .... - Page 4 MICRF102 Micrel Parameter Condition Unit Digital / Control Section Calibration Time Note 8, ASK=HIGH Power Amplifier Output Hold Off Note 9, STDBY transition from LOW to HIGH Time from STBY Crystal, ESR < 20Ω Transmitter Stabilization Time From External Reference (500mVpp) from STBY Crystal, ESR <...
- Page 5 MICRF102 Micrel Typical Characteristics Output Power vs Mark Current vs PC Pin Voltage PC Pin Voltage 100 200 300 400 500 600 100 200 300 400 500 600 (mV) (mV) September 2002 MICRF102...
-
Page 6: Functional Diagram
MICRF102 Micrel Functional Diagram Reference STBY Bias (10) ANTP Power Bias Control ANTM Prescaler Divide Buffer by 32 (6a) Antenna Phase Tuning Buffer Detector Control VCO (4) (6b) Varactor Device REF.OSC Reference (11) Oscillator (1) Figure 2. MICRF102 Block Diagram... - Page 7 MICRF102 Micrel Applications Information difficult to match the parallel and series capacitors. Another point to take into consideration is the total ac rms current Design Process going through the internal varactor in the MICRF102. This The MICRF102 transmitter design process is as follows: current should not exceed 16mA rms.
- Page 8 MICRF102 Micrel In the simplest implementation, the inductance of the loop Transmit Power antenna should be chosen such that the nominal value is The transmit power specified in this datasheet is normalized resonant at 5pF, the nominal mid-range value of the MICRF102 to a 50Ohm load.
- Page 9 8 2 10 transmitter PCB, the 90 degree plot represents the plane SERIES perpendicular to the PCB. Micrel’s evaluation of the perfor- mance of the board in Figure 6. indicates an even more uniform radiation pattern that the theoretical plot shown here.
- Page 10 MICRF102 Micrel MICRF102 Series Capacitor Calculation f = 433.92 × 10 L = 52 × 10 = 5 × 10 = 2.7 × 10 π π × × × − × 2 587 10 SERIES − − × 3 9 10 SERIES L1 = 52 ×...
- Page 11 MICRF102 Micrel Package Information 0.026 (0.65) MAX) PIN 1 DIMENSIONS: 0.154 (3.90) INCHES (MM) 0.193 (4.90) 0.050 (1.27) 0.016 (0.40) 45° 3°–6° 0.063 (1.60) MAX 0.197 (5.0) 0.244 (6.20) 0.189 (4.8) 0.228 (5.80) SEATING 0.057 (1.45) PLANE 0.049 (1.25) 8-Pin SOP (M)
- Page 12 This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel, Inc.
Need help?
Do you have a question about the QwikRadio MICRF102 and is the answer not in the manual?
Questions and answers