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PDF MICRF113 Data sheet ( Hoja de datos )
| Número de pieza | MICRF113 | |
| Descripción | ASK Transmitter | |
| Fabricantes | Micrel Semiconductor | |
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MICRF113
300MHz to 450MHz +10dBm
ASK Transmitter in SOT23
General Description
The MICRF113 is a high-performance, easy-to-use, single-
chip ASK Transmitter IC for remote wireless applications in
the 300MHz to 450MHz frequency band. This transmitter
IC is a true “data-in, antenna-out” monolithic device.
MICRF113 has three strong attributes: power delivery,
operating voltage and operating temperature. In terms of
power, the MICRF113 is capable of delivering +10dBm
into a 50Ω load. This power level enables a small form
factor transmitter (lossy antenna) such as a key fob
transmitter to operate near the maximum limit of
transmission regulations. In terms of operating voltage, the
MICRF113 operates from 1.8V to 3.6V. Many transmitter
ICs in the same frequency band stop operating below
2.0V. The MICRF113 will work with most batteries to the
end of their useful limits. In terms of operating
temperature, the MICRF113 operates from −40°C to
+85°C.
The MICRF113 is easy to use. It requires a reference
frequency (RF carrier frequency divided by 32 times)
generated from a crystal with a few additional external
parts to create a complete versatile transmitter.
The MICRF113 operates with Amplitude Shift Keying/On-
Off Keyed (ASK/OOK) UHF receiver types from wide-band
super-regenerative radios to narrow-band, high-
performance super-heterodyne receivers. The
MICRF113’s maximum ASK bit rate is 20kbps (minimum
pulse width of 50µs at ASK pin).
The MICRF113 transmitter solution is ideal for industrial
and consumer applications where simplicity and form
factor are important.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Complete UHF ASK transmitter
• Frequency range 300MHz to 450MHz
• Bit rates up to 20kbps
• Output power up to 10dBm
• Low external part count
• Low voltage operation (down to 1.8V)
• Operate with crystals or ceramic resonators
• 6-pin SOT23
Applications
• Fan Controllers
• Remote Power Switches
• Multimedia Remote Control
• Remote Sensor Data Links
• Infrared Transmitter Replacement
Ordering Information
Part Number
MICRF113YM6
Temperature Range
−40°C to +85°C
Package
SOT23-6
QwikRadio is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2010
M9999-112310
1 page  
Micrel, Inc.
Test Circuit
MICRF113
Figure 2. MICRF113 Test Circuit with 50Ω Output
November 2010
5 M9999-112310
5 Page 
Micrel, Inc.
Functional Description
Figure 3 is a functional block diagram of the MICRF113
transmitter. The MICRF113 is best described as a phase
locked transmitter. The MICRF113 system is partitioned
into five functional blocks:
• Crystal oscillator
• PLL×32
• Power amplifier
• Enable control
• Undervoltage detection
Crystal Oscillator
The reference oscillator is crystal-based Pierce
configuration, designed to accept crystals with frequency
from 9.375MHz to 14.0625MHz.
Crystal Oscillator Parameters for ASK Operation
Figure 4 shows a reference oscillator circuit
configuration for ASK operation. The reference oscillator
is capable of driving crystals with ESR range from 20Ω
to 300Ω.
When the ESR of crystal is at 20Ω, the crystal parameter
limits are:
• ESR 20Ω
• Cpar 2 to 10pF
• Cmo 10 to 40fF
CRYSTAL MODEL
ESR
CMO
CPAR
CLOAD
CLOAD
XTLOUT
VSS
MICRF113
When the ESR of crystal is at 300Ω, the crystal
parameter limits are:
• ESR 300Ω
• CPAR 2 to 5pF
• CMO 10 to 40fF
• CLOAD 10 to 30pF
PLL ×32
The function of PLL×32 is to provide a stable carrier
frequency for transmission. It is a “divide by 32” phase
locked loop oscillator.
Power Amplifier
The power amplifier serves two purposes: 1) to buffer
the VCO from external elements and 2) to amplify the
phase locked signal. The power amplifier can produce
+10dBm at 3V (typical).
Enable Control
Enable control gates the ASK data. It only allows
transmission when Lock, Amplitude and Under Voltage
Detect conditions are valid.
Undervoltage Detect
“Undervoltage detect” block senses operating voltage. If
the operating voltage falls below 1.6V, “undervoltage
detect” block will send a signal to “enable control” block
to disable the PA.
XTLIN
MICRF113 ASK
Figure 4. Reference Oscillator ASK Operation
November 2010
11 M9999-112310
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet MICRF113.PDF ] | |
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