RO2103A
•
•
•
•
•
Ideal for 418 MHz Transmitters in the U.K. and U.S.
Very Low Series Resistance
Quartz Stability
Surface-Mount, Ceramic Case with 21 mm
2
Footprint
Complies with Directive 2002/95/EC (RoHS)
The RO2103A is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount, ceramic case.
It provides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters
operating at 418.0 MHz. This SAW is designed for remote-control and wireless security transmitters operating
in the United Kingdom under DTI MPT 1340 and in the USA under FCC Part 15.
418.0 MHz
SAW
Resonator
Absolute Maximum Ratings
Rating
CW RF Power Dissipation (See Typical Test Circuit)
DC Voltage Between Terminals (Observe ESD Precautions)
Case Temperature
Soldering Temperature (10 seconds / 5 cycles max.)
Value
+0
±30
-40 to +85
260
Units
dBm
VDC
°C
°C
SM-2 Case
Electrical Characteristics
Characteristic
Frequency (+25 °C)
Insertion Loss
Quality Factor
Temperature Stability
Unloaded Q
50
Ω
Loaded Q
Turnover Temperature
Turnover Frequency
Frequency Temperature Coefficient
Frequency Aging
RF Equivalent RLC Model
Absolute Value during the First Year
Motional Resistance
Motional Inductance
Motional Capacitance
Transducer Static Capacitance
Test Fixture Shunt Inductance
Lid Symbolization
DC Insulation Resistance between Any Two Terminals
R
M
L
M
C
M
C
O
L
TEST
5, 6, 9
2, 7
106
1.6
5, 6, 7, 9
Nominal Frequency
Tolerance from 418.000 MHz
Sym
f
C
Δf
C
IL
Q
U
Q
L
T
O
f
O
FTC
|f
A
|
Notes
2, 3, 4, 5
2, 5, 6
5, 6, 7
Minimum
417.925
Typical
Maximum
418.075
±75
Units
MHz
kHz
dB
1.0
16,100
1,700
10
25
f
C
0.032
10
1.0
12
74.8223
1.93705
1.9
80
2.0
40
°C
ppm/°C
2
ppm/yr
MΩ
6, 7, 8
1, 6
5
26
Ω
µH
fF
2.2
pF
nH
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
Frequency aging is the change in f
C
with time and is specified at
+65°C or less. Aging may exceed the specification for prolonged tem-
peratures above +65°C. Typically, aging is greatest the first year after
manufacture, decreasing in subsequent years.
The center frequency, f
C
, is measured at the minimum insertion loss
point, IL
MIN
, with the resonator in the 50
Ω
test system (VSWR
≤
1.2:1). The shunt inductance, L
TEST
, is tuned for parallel resonance
with C
O
at f
C
. Typically, f
OSCILLATOR
or f
TRANSMITTER
is approximately
equal to the resonator f
C
.
One or more of the following United States patents apply: 4,454,488
and 4,616,197.
Typically, equipment utilizing this device requires emissions testing
and government approval, which is the responsibility of the equipment
manufacturer.
Unless noted otherwise, case temperature T
C
= +25°C±2°C.
The design, manufacturing process, and specifications of this device
7.
8.
are subject to change without notice.
Derived mathematically from one or more of the following directly
measured parameters: f
C
, IL, 3 dB bandwidth, f
C
versus T
C
, and C
O
.
Turnover temperature, T
O
, is the temperature of maximum (or
turnover) frequency, f
O
. The nominal frequency at any case
temperature, T
C
, may be calculated from: f = f
O
[1 - FTC (T
O
-T
C
)
2
].
Typically
oscillator
T
O
is approximately equal to the specified
resonator
T
O
.
This equivalent RLC model approximates resonator performance near
the resonant frequency and is provided for reference only. The
capacitance C
O
is the static (nonmotional) capacitance between the
two terminals measured at low frequency (10 MHz) with a capacitance
meter. The measurement includes parasitic capacitance with "NC”
pads unconnected. Case parasitic capacitance is approximately
0.05 pF. Transducer parallel capacitance can by calculated as:
C
P
≈
C
O
- 0.05 pF.
2.
3.
4.
5.
6.
9.
www.RFM.com
E-mail: info@rfm.com
©2008 by RF Monolithics, Inc.
Page 1 of 2
RO2103A - 3/24/08
Electrical Connections
The SAW resonator is bidirectional and may be
installed with either orientation. The two terminals
are interchangeable and unnumbered. The callout
NC indicates no internal connection. The NC pads
assist with mechanical positioning and stability.
External grounding of the NC pads is
recommended to help reduce parasitic
capacitance in the circuit.
Terminal
NC
NC
Equivalent LC Mode
l
0.05 pF*
Co = Cp + 0.05 pF
Cp
Terminal
*Case Parasitics
Rm
Lm
Cm
Temperature Characteristics
The curve shown on the right
accounts for resonator
contribution only and does not
include LC component
temperature contributions.
f
C
= f
O
, T
C
= T
O
0
(f-fo ) / fo (ppm)
Typical Test Circuit
The test circuit inductor, L
TEST
, is tuned to resonate with the static
capacitance, C
O
, at F
C
.
0
-50
-100
-150
-200
0 +20 +40 +60 +80
-50
-100
-150
-200
-80 -60 -40 -20
ELECTRICAL TEST
From 50
Ω
Network Analyzer
Typical Circuit
Land Pattern
To 50
Ω
Network Analyzer
Board
Δ
T = T
C
- T
O
( °C )
The circuit board land pattern
shown below is one possible design. The optimum land pattern is
dependent on the circuit board assembly process which varies by
manufacturer. The distance between adjacent land edges should be at a
maximum to minimize parasitic capacitance. Trace lengths from terminal
lands to other components should be short and wide to minimize parasitic
series inductances.
(4 Places)
Typical Dimension:
0.010 to 0.047 inch
(0.25 to 1.20 mm)
Case Design
The case material is black alumina with contrasting symbolization. All pads
are nominally centered with respect to the base and consist of 40 to
70 microinches electroless gold on 60-350 micorinches electroless nickel.
Typical Application Circuits
Typical Low-Power Transmitter Application
+9VDC
Modulation
Input
200k
Ω
C1
L1
47
(Antenna)
ROXXXXA
Bottom View
470
C2
RF Bypass
Millimeters
Dimensions
Min
A
B
5.74
3.73
1.70
0.94
0.83
1.16
0.94
0.43
0.43
5.08
0.38
3.05
Inches
Min
0.226
0.147
0.067
0.037
0.033
0.046
0.037
0.017
0.017
0.200
0.015
0.120
Max
5.99
3.99
2.29
1.10
1.20
1.53
1.10
0.59
0.59
5.33
0.64
3.30
Max
0.236
0.157
0.090
0.043
0.047
0.060
0.043
0.023
0.023
0.210
0.025
0.130
Typical Local Oscillator Application
Output
+VDC
C1
L1
C
D
E
+VDC
F
G
H
K
ROXXXXA
Bottom View
C2
RF Bypass
M
N
P
www.RFM.com
E-mail: info@rfm.com
©2008 by RF Monolithics, Inc.
Page 2 of 2
RO2103A - 3/24/08
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