Microchip-Tech-MICRF113YM6-TR
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MICRF113
300MHz to 450MHz
+
10dBm
ASK Transmitter in SOT23
General Description
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
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 50
Ω
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.
Applications
•
Fan Controllers
•
Remote Power Switches
•
Multimedia Remote Control
•
Remote Sensor Data Links
•
Infrared Transmitter Replacement
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.
Ordering Information
Part Number
Temperature Range
Package
The MICRF113 operates with Amplitude Shift Keying/On-
Off Keyed (ASK/OOK) UHF receiver types from wide-band
MICRF113YM6
SOT23-6
−
40
°
C to
+
85°C
super-regenerative
performance super-heterodyne
radios
to
narrow-band,
receivers.
high-
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
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
M9999-112310
November 2010
Micrel, Inc.
MICRF113
Typical Application
Figure 1.
Typical Application Circuit for 433.92MHz and 315MHz
(component values for 315MHz in parenthesis)
Pin Configuration
Pin Description
Pin Number
MSOP-6
Pin Name
PAOUT
Pin Function
1
2
3
4
5
6
PA output
VSS
VDD
Ground
Positive Power Supply
Voltage (Input)
Crystal Out (Output): Reference Oscillator Output Connection.
Crystal In (Input): Reference Oscillator Input Connection.
ASK DATA Input
XTLOUT
XTLIN
ASK
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Micrel, Inc.
MICRF113
Absolute Maximum Ratings
(1)
Operating Ratings
(2)
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)……………………
.
+
3
00°C
ESD Rating
(3)
………………………………………………………..
.
2
kV
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, 50
ꢀ
load.
Parameter
Condition
Min.
Typ.
Max.
Units
Power Supply
Mark Supply Current I
MARK
,
@ 315MHz, P
OUT
= +10dBm
@ 433.92MHz, P
OUT
= +10dBm
@ 315MHz
12.3
12.5
2
mA
mA
V
ASK
= 3.0V
SPACE Supply Current, I
SPACE
ASK
= 0V
,
V
@ 433.92 MHz
2
RF Output Section and Modulation Limits
@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
Output Power Level, P
OUT
ASK “mark”
dBm
dBc
−
39
−
53
−
55
−
55
70
Harmonics Output
for 315MHz
Harmonics Output
for 433.92MHz
dBc
dBc
Extinction Ratio for ASK
ASK Modulation
Encoded Bit Rate
20
kbps
kHz
@315MHz
(6)
@433.92MHz
(6)
<700
Occupied Bandwidth
<1000
VCO Section
@ 100kHz from Carrier
@ 1000kHz from Carrier
@ 100kHz from Carrier
@ 1000kHz from Carrier
−
76
−
79
−
72
−
81
315MHz Single-Side Band Phase Noise
dBc/Hz
dBc/Hz
433.92MHz Single-Side Band Phase Noise
Notes:
1. Exceeding
the absolute maximum rating may damage the device.
2. The
device is not guaranteed to function outside its operating rating.
3. Devices
are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Measured
using Test Circuit in Figure 2.
5. Dependent
on crystal
6. RBW
= 100kHz, OBW measured at
−
20dBc.
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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, 50
ꢀ
load.
Parameter
Condition
Min.
Typ.
Max.
Units
Reference Oscillator Section
XTLIN, XTLOUT
Pin capacitance
2
pF
pF
µs
From each side of the crystal to
GND
External Capacitance
18
Oscillator Startup Time
(5)
Digital / Control Section
Output Blanking
Crystal: HC49S
300
VDD transition from LOW to HIGH
500
µs
V
High (V
IH
)
Low (V
IL
)
High (V
IH
)
Low (V
IL
)
0.8
×
V
DD
Digital Input
ASK Pin
0.2
×
V
DD
0.05
0.05
1.6
Digital Input Leakage Current ASK Pin
Undervoltage Lock Out (UVLO)
µA
V
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Micrel, Inc.
MICRF113
Test Circuit
Figure 2.
MICRF113 Test Circuit with 50
Ω
Output
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Micrel, Inc.
MICRF113
Typical Characteristics
−
MICRF113 50
Ω
Test Board
315MHz OBW, ASK = 2kbps
315MHz OBW, ASK = 20kbps
CW Max Power @ 3V, 315MHz
(1)
RF Spectrum 2
nd
Harmonic; Fundamental at 315MHz
RF Spectrum 3
rd
Harmonic; Fundamental at 315MHz
315MHz, Power Level at Space,
VDD = 3.0V, ASK = 2kbps,
−
62dBm
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Micrel, Inc.
MICRF113
Typical Characteristics
−
MICRF113 50
Ω
Test Board (Continued)
315MHz, Zero Span , ASK = 2kbps
315MHz, Zero Span,
ASK = 20kbps
315MHz, Phase Noise, ASK = 2kbps,
100kHz Offset, –75.59dBc/Hz
315MHz, Phase Noise, ASK = 2kbps,
1MHz Offset, –78.99dBc/Hz
315MHz, Phase Noise, ASK = CW,
100kHz Offset, –70.96dBc/Hz
315MHz, Phase Noise, ASK = CW,
1MHz Offset, –76.72dBc/Hz
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Micrel, Inc.
MICRF113
Typical Characteristics
−
MICRF113 50
Ω
Test Board (Continued)
433.92MHz OBW, ASK = 2kbps
433.92MHz OBW, ASK = 20kbps
433.92MHz, CW Max Power @ 3V, ASK = 2kbps
(1)
RF Spectrum 2
nd
Harmonic; Fundamental at 433.92MHz
RF Spectrum 3
rd
Harmonic; Fundamental at 433.92MHz
433.92MHz Power Level at Space,
VDD = 3.0V, ASK = 2kbps, -52dBm
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Micrel, Inc.
MICRF113
Typical Characteristics
−
MICRF113 50
Ω
Test Board (Continued)
433.92MHz Zero Span, 2kbps
433.92ASK Zero Span at 20kbps
433.92MHz Phase Noise, ASK = CW,
433.92MHz Phase Noise, ASK = CW,
1MHz Offset, –78.49dBc/Hz
100kHz Offset,
−
81.73dBc/Hz
433.92MHz Phase Noise, ASK = 2kbps,
100kHz Offset, –71.64dBc/Hz
433.92MHz Phase Noise, ASK = 2kbps,
1MHz Offset, –79.4dBc/Hz
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Micrel, Inc.
MICRF113
Functional Diagram
Figure 3.
MICRF113 Functional Block Diagram
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Micrel, Inc.
MICRF113
When the ESR of crystal is at 300
ꢀ
, the crystal
parameter limits are:
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:
•
•
•
•
ESR 300
ꢀ
C
PAR
2 to 5pF
C
MO
10 to 40fF
C
LOAD
10 to 30pF
•
•
•
•
•
Crystal oscillator
PLL×32
PLL ×32
Power ampli
fi
er
Enable control
Undervoltage detection
The function of PLL×32 is to provide a stable carrier
frequency for transmission. It is a “divide by 32” phase
locked loop oscillator.
Crystal Oscillator
Power Amplifier
The reference oscillator is crystal-based Pierce
con
fi
guration, designed to accept crystals with frequency
from 9.375MHz to 14.0625MHz.
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).
Crystal Oscillator Parameters for ASK Operation
Enable Control
Figure
4
shows
a
reference oscillator circuit
con
fi
guration for ASK operation. The reference oscillator
is capable of driving crystals with ESR range from 20
ꢀ
to 300
ꢀ
.
Enable control gates the ASK data. It only allows
transmission when Lock, Amplitude and Under Voltage
Detect conditions are valid.
When the ESR of crystal is at 20
ꢀ
, the crystal parameter
limits are:
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.
•
•
•
ESR 20
ꢀ
Cpar 2 to 10pF
Cmo 10 to 40fF
CRYSTAL MODEL
XTLOUT
ESR
C
LOAD
VSS
C
MO
C
PAR
C
LOAD
XTLIN
MICRF113 ASK
Figure 4.
Reference Oscillator ASK Operation
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November 2010
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Micrel, Inc.
MICRF113
50
Ω
Test Board, VDD = 3.0V
Application Information
R7 (
ꢀ
)
0
Output Power (dBm)
IDD (mA)
12.3
11
The MICRF113 is well suited to drive a 50
ꢀ
load,
monopole or a loop antenna. Figure 6 is an example of a
loop antenna configuration. Figure 6 also shows both
315MHz and 433.92MHz ASK configurations for a loop
antenna. Besides using a different crystal, Table 1 lists
modified values needed for the listed frequencies.
10
8.5
8.0
3.0
-2.0
75
100
500
1000
10.5
7.3
5.9
Frequency
(MHz)
L1
(nH)
C5
(pF)
L4
(nH)
C7
(pF)
Y1 (MHz)
Table 2. Output Power vs. External Resistor @ 315MHz
315.0
470
820
10
12
150
68
6.8
4.7
9.84375
13.5600
433.92
50
ꢀ
Test Board, VDD = 3.0V
R7 (
ꢀ
)
0
Output Power (dBm)
IDD (mA)
12.5
12
Table 1. Modified Values for Listed Frequencies
9.8
8.9
The reference design shown in Figure 6 has an antenna
optimized for using the matching network as described in
Table 1.
75
100
500
1000
8.6
11.8
8.9
2.0
Power Amplitude Control Using External Resistor
7.3
−
3.0
R7 is used to adjust the RF amplitude output levels
which may be needed to meet compliance regulation. As
an example, the following tables list typical values of
conducted RF output levels and corresponding R7
resistor values for the 50
ꢀ
test board, as shown in
Figure 2. R7 of the TX113-1C Demo board using the
loop antenna can be adjusted for the appropriate
radiated field allowed by FCC or ETSI compliance.
Contact Micrel for suggested R7 values to meet FCC
and ETSI compliances.
Table 3. Output Power vs. External Resistor @ 433.92MHz
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Micrel, Inc.
MICRF113
Notes:
1. Components
labeled NP are not placed.
2. Values
in parenthesis apply only to 315MHz option.
3. Value
of R7 is selected to vary the output power.
Figure 6.
ASK 433.92MHz and 315MHz
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November 2010
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Micrel, Inc.
MICRF113
Output Power ON-OFF Control
Output Matching Network
There are two ways to enable the PA output power.
First, by supplying the ASK signal with VDD applied
continuously, resulting in a Mark and Space RF output
condition. A second method involves applying both VDD
and ASK synchronously. The second method allows for
longer battery usage since the battery is disconnected
during non-activation. Figure 7 shows the RF output time
response since VDD and the ASK are applied to the
MICRF113. The RF output response, as a function of
VDD, is typically less then 1.25mSec. This measurement
was done using the circuitry shown in Figure 2.
Part of the function of the output network is to attenuate
the second and third harmonics. When matching to a
transmit frequency, care must be taken both to optimize
for maximum output power, and to attenuate unwanted
harmonics.
Layout Issues
PCB Layout is a primary concern for achieving optimum
performance and consistent manufacturing results. Care
must used with the orientation of components to ensure
that they do not couple or decouple the RF signal.
PCB
trace length should be short to minimize parasitic
inductance (1 inch ~ 20nH). For example, depending
upon inductance values, a 0.5 inch trace can change the
inductance by as much as 10%. To reduce parasitic
inductance, the practice of using wide traces and a
ground plane under the signal traces is recommended.
Vias with low value inductance should be used for
components requiring a connection-to-ground.
Note
: The ASK signal should never be applied before
VDD.
Antenna Layout
Directivity is affected by antenna trace layout. No ground
plane should be under the antenna trace. For consistent
performance, components should not be placed inside
the loop of the antenna. Gerber formats (see Figure 8,
for a suggested layout) can be obtained from the Micrel
Figure 7.
RF Output Response (VDD and ASK)
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Micrel, Inc.
MICRF113
Assembly Drawing
Top Layer
Bottom Layer
Figure 8.
PCB Demo Board
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Micrel, Inc.
MICRF113
Function
Name
Functional Description
Pin
Functional Description
Figure 8 shows the TX113-1c Demo Board PCB layout
and assembly (Gerber format). Figure 9 is a detailed
schematic of the TX113-1c. Note that components
labeled as NP (not placed) can be used to obtain
different configurations. Table 4 describes each header
pin connector used in the demo board.
J1-1
J1-2
J1-3
J2-1
J2-2
VDD
1.8V to 3.6V input voltage
Ground
VSS
ASK
Modulating Data Input
External Reference Oscillator Input
Ground
REF-OSC
VSS
Table 4. Demo Board Pin Names and Descriptions
Notes:
1. NP
= Not Placed
2. Values
in parenthesis apply only to 315MHz option.
3. R7
is selected to vary output power
Figure 9.
TX113-1c Demo Board Schematic
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November 2010
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Micrel, Inc.
MICRF113
Bill of Materials (433.92MHz)
Item
Part Number
Manufacturer Description
Qty.
1
C1
GRM21BR60J106K
GRM1885C1H101J
GRM1885C1H120J
Murata
(1)
10µF
±
10%, 0805 capacitor
C2
Murata
(1)
Murata
(1)
Murata
(1)
Murata
(1)
Murata
(1)
Murata
(1)
1
100pF
±
5%, 0603 capacitor
12pF
±
5%, 0603 capacitor
(NP)
C5
1
C6, C11, C16
3
C7
GQM1875C2E4R7C
GRM188R61C104K
GRM1885C1H180J
TSHR-114-S-02-A-GT
0805CS-471XJB
1
4.7pF
±
0.25pF, 0603 capacitor
0.1µF
±
10%, 0603 capacitor
18pF
±
5%, 0603 capacitor
3-pin header
C10
C13, C14
J1
1
2
1
L1
Coilcraft
(2)
Coilcraft
(2)
1
470nH
±
5%, 0805 wire-wound inductor
68nH
±
5%, 0603 wire-wound inductor
PCB ANTENNA
L4
0603CS-068NXJB
1
L5
ANTENNA LOOP (Part of PCB)
CRCW0603100KFKEA
CRC06030000Z0EA
1
R2
Vishay
(3)
Vishay
(3)
1
100k
ꢀ
±
5%, 0603 resistor
0
ꢀ
±
5%, 0603 resistor
R7
1
Hosonic
Industrial
Brazil
(4)
Y1
SA-13.5600-F-10-J-30-30-x
1
13.560MHZ
±
30ppm crystal
300MHz to 450MHz
+
10dBm ASK
Transmitter in SOT23
U1
MICRF113YM6
Micrel, Inc.
(5)
1
Notes:
M9999-112310
November 2010
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Micrel, Inc.
MICRF113
Bill of Materials (315MHz)
Item
Part Number
Manufacturer
Murata
(1)
Murata
(1)
Murata
(1)
Murata
(1)
Murata
(1)
Murata
(1)
Murata
(1)
Description
Qty.
1
C1
GRM21BR60J106K
GRM1885C1H101J
GRM1885C1H120J
10µF
±
10%, 0805 capacitor
100pF
±
5%, 0603 capacitor
10pF
±
5%, 0603 capacitor
(NP)
C2
1
C5
1
C6, C11, C16
3
C7
GQM1875C2E4R7C
GRM188R61C104K
GRM1885C1H180J
TSHR-114-S-02-A-GT
0805CS-471XJB
1
6.8pF
±
0.25pF, 0603 capacitor
0.1µF
±
10%, 0603 capacitor
18pF
±
5%, 0603 capacitor
3-pin header
C10
C13, C14
J1, J2
L1
1
2
1
Coilcraft
(2)
Coilcraft
(2)
1
470nH
±
5%, 0805 wire-wound inductor
150nH
±
5%, 0603 wire-wound inductor
PCB ANTENNA
L4
0603CS-R15XJB
1
L5
ANTENNA LOOP (Part of PCB)
CRCW0603100KFKEA
CRC06030000Z0EA
1
R2
Vishay
(3)
Vishay
(3)
1
100k
ꢀ
±
5%, 0603 resistor
0
ꢀ
±
5%, 0603 resistor
R7
1
Hosonic
Industrial
Brazil
(4)
Y1
SA-9.84375-F-10- J-30-30-x
1
9.84375MHZ
±
30ppm crystal
300MHz to 450MHz
+
10dBm ASK
Transmitter in SOT23
U1
MICRF113YM6
Micrel, Inc.
(5)
1
Notes:
M9999-112310
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Micrel, Inc.
MICRF113
PCB Layout Recommendations (50
ꢀ
Test Board)
Assembly Drawing
Top Layer
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Micrel, Inc.
MICRF113
PCB Layout Recommendations (50
ꢀ
Test Board)
Bottom Layer
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Micrel, Inc.
MICRF113
Package Information
Notes:
1. Dimensions
and tolerances are in accordance with ANSI Y14.5M, 1982.
2. Package
surface to be mirror finish.
3. Die
is facing up for mold. Die is facing down for trim/form, that is, reverse trim/form.
4. The
foot-length measuring is based on the gauge plane method.
5
Dimensions are exclusive of mold flash and gate burr.
6-Pin SOT (YM6)
MICREL, INC.
2180 FORTUNE DRIVE
SAN JOSE, CA
95131 USA
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use.
Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice.
No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document.
Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2008 Micrel, Incorporated.
M9999-112310
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