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
Micrel, Inc.
MICRF113
Absolute Maximum Ratings
(1)
Supply Voltage V
DD
.....................................................+5.0V
Voltage on PA
OUT
........................................................+7.2V
Voltage on I/O Pins ............................ V
SS
– 0.3 to V
DD
+ 0.3
Storage Temperature Range ...................−65°C to + 150°C
Lead Temperature (soldering, 10s)......................... + 300°C
ESD Rating
(3)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage V
DD
.......................................... 1.8V to 3.6V
Ambient Operating Temperature (T
A
) ......... –40°C to +85°C
Transmitter Frequency Range ............. 300MHz to 450MHz
Electrical Characteristics
(4)
V
DD
= 3.0V, T
A
= 25°C, Freq
REFOSC
= 13.560MHz.
Bold
values indicate –40°C to 85°C unless otherwise noted. 2kbps bit rate, 50Ω load.
Parameter
Power Supply
Mark Supply Current I
MARK
,
V
ASK
= 3.0V
SPACE Supply Current, I
SPACE
,
V
ASK
= 0V
RF Output Section and Modulation Limits
Output Power Level, P
OUT
ASK "mark"
@315MHz
(4)
@433.92MHz
(4)
@ 630MHz
(4)
2nd harm.
@945MHz
(4)
3rd harm.
@ 867.84MHz
(4)
2nd harm.
@1301.76MHz
(4)
3rd harm.
10
10
−39
−53
−55
−55
70
dBm
@ 315MHz, P
OUT
= +10dBm
@ 433.92MHz, P
OUT
= +10dBm
@ 315MHz
@ 433.92 MHz
12.3
12.5
2
2
mA
Condition
Min.
Typ.
Max.
Units
mA
Harmonics Output for 315MHz
dBc
Harmonics Output for 433.92MHz
Extinction Ratio for ASK
ASK Modulation
Encoded Bit Rate
Occupied Bandwidth
VCO Section
315MHz Single-Side Band Phase Noise
dBc
dBc
20
@315MHz
(6)
@433.92MHz
(6)
kbps
kHz
<700
<1000
−76
−79
−72
−81
@ 100kHz from Carrier
@ 1000kHz from Carrier
@ 100kHz from Carrier
@ 1000kHz from Carrier
dBc/Hz
433.92MHz Single-Side Band Phase Noise
Notes:
1.
2.
3.
4.
5.
6.
dBc/Hz
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Measured using Test Circuit in Figure 2.
Dependent on crystal
RBW = 100kHz, OBW measured at
−20dBc.
November 2010
3
M9999-112310
Micrel, Inc.
MICRF113
Electrical Characteristics
(4)
(Continued)
V
DD
= 3.0V, T
A
= 25°C, Freq
REFOSC
= 13.560MHz.
Bold
values indicate –40°C to 85°C unless otherwise noted. 2kbps bit rate, 50Ω load.
Parameter
Reference Oscillator Section
XTLIN, XTLOUT
External Capacitance
Oscillator Startup Time
(5)
Digital / Control Section
Output Blanking
Digital Input ASK Pin
Digital Input Leakage Current ASK Pin
Undervoltage Lock Out (UVLO)
VDD transition from LOW to HIGH
High (V
IH
)
Low (V
IL
)
High (V
IH
)
Low (V
IL
)
0.05
0.05
1.6
0.8
×
V
DD
0.2
×
V
DD
Condition
Pin capacitance
From each side of the crystal to
GND
Crystal: HC49S
Min.
Typ.
2
18
300
500
Max.
Units
pF
pF
µs
µs
V
µA
V
November 2010
4
M9999-112310
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