RFM products are now Murata products.

RFM products are now Murata products.
RFM products are now
Murata products.
RO3118A
•
•
•
•
•
Designed for 318.0 MHz Transmitters
Very Low Series Resistance
Quartz Stability
Surface-mount Ceramic Case
Complies with Directive 2002/95/EC (RoHS)
318.0 MHz
SAW
Resonator
Pb
The RO3118A is a one-port surface-acoustic-wave (SAW) resonator packaged in a surface-mount ceramic
case. It provides reliable, fundamental-mode quartz frequency stabilization of fixed-frequency transmitters
operating at 318.0 MHz.
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation (See: Typical Test Circuit)
+0
dBm
DC Voltage Between Terminals (Observe ESD Precautions)
±30
VDC
Case Temperature
-40 to +85
°C
260
°C
Soldering Temperature (10 seconds / 5 cycles maximum)
Electrical Characteristics
Characteristic
Center Frequency, +25 °C
Sym
fC
Absolute Frequency
Tolerance from 318.0 MHz
Quality Factor
Temperature Stability
Frequency Aging
2,3,4,5
fC
Insertion Loss
IL
Unloaded Q
QU
50 Loaded Q
QL
Turnover Temperature
TO
Turnover Frequency
fO
1.5
|fA|
25
0.032
5
RM
Motional Inductance
LM
Motional Capacitance
CM
Shunt Static Capacitance
CO
5, 6, 9
LTEST
2, 7
MHz
±75
kHz
2.0
dB
40
°C
fC
10
1
Motional Resistance
Units
318.075
2000
10
FTC
Maximum
12000
6,7,8
Frequency Temperature Coefficient
Typical
317.925
5,6,7
Absolute Value during the First Year
Test Fixture Shunt Inductance
Minimum
2,5,6
DC Insulation Resistance between Any Two Terminals
RF Equivalent RLC Model
Notes
SM5035-4
1.0
5, 7, 9
Lid Symbolization (in addition to Lot and/or Date Codes)
ppm/°C2
ppm/yr
M
19.8

118
µH
2.1
fF
2.9
pF
79
nH
661 // YYWWS
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
NOTES:
1.
2.
3.
4.
5.
6.
Frequency aging is the change in fC with time and is specified at +65 °C or
less. Aging may exceed the specification for prolonged temperatures
above +65 °C. Typically, aging is greatest the first year after manufacture,
decreasing in subsequent years.
The center frequency, fC, is measured at the minimum insertion loss point,
ILMIN, with the resonator in the 50  test system (VSWR  1.2:1). The
shunt inductance, LTEST, is tuned for parallel resonance with CO at fC.
Typically, fOSCILLATOR or fTRANSMITTER is approximately equal to the
resonator fC.
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 TC = +25 ± 2 °C.
The design, manufacturing process, and specifications of this device are
subject to change without notice.
©2010-2014 by Murata Electronics N.A., Inc.
RO3118A (R) 4/18/14
7.
8.
9.
10.
Page 1 of 2
Derived mathematically from one or more of the following directly
measured parameters: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
Turnover temperature, TO, is the temperature of maximum (or turnover)
frequency, fO. The nominal frequency at any case temperature, TC, may be
calculated from: f = fO [1 - FTC (TO -TC)2]. Typically oscillator TO is
approximately equal to the specified resonator TO.
This equivalent RLC model approximates resonator performance near the
resonant frequency and is provided for reference only. The capacitance CO
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: CP  CO - 0.05 pF.
Tape and Reel standard per ANSI / EIA 481.
www.murata.com
Electrical Connections
Equivalent RLC Model
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.
C
Terminal
Case Ground
Case Ground
P
L
Terminal
C
S
C
M
C
R
M
= 0 .0 5 p F (C a s e P a r a s itic s )
= S A W S ta tic C a p a c ita n c e
= C S + C P
P
C
C
S
O
M
Temperature Characteristics
The test circuit inductor, LTEST, is tuned to resonate with the static
capacitance, CO, at FC.
ELECTRICAL TEST
fC = f O , T C = T O
-50
-50
-100
-100
-150
-150
-200
-80 -60 -40 -20
Case
-200
0 +20 +40 +60 +80
T = TC - T O ( °C )
To 50 
Network Analyzer
From 50 
Network Analyzer
0
0
(f-fo ) / fo (ppm)
Typical Test Circuit
The curve shown on the right
accounts for resonator
contribution only and does not
include LC component
temperature contributions.
T o p V ie w
S id e V ie w
B
C
B o tto m
V ie w
E (3 x )
4
F (4 x )
1
A
POWER TEST
3
P
INCIDENT
50  Source
P
at F C
REFLECTED
Low-Loss
Matching
Network to
50 
2
Terminal
G
(1 x )
NC
NC
D
Terminal
H
CW RF Power Dissipation =
P INCIDENT - P REFLECTED
I
Typical Application Circuits
I
Typical Low-Power Transmitter Application
I
H
H
+9VDC
Modulation
Input
J
H
200k 
C1
47
K
L1
(Antenna)
L
PCB Land Pattern
Top View
C2
RF Bypass
RO3XXXA
Bottom View
470
Dimensions
A
Typical Local Oscillator Applications
Output
+VDC
C1
+VDC
L1
C2
RO3XXXA
Bottom View
©2010-2014 by Murata Electronics N.A., Inc.
RO3118A (R) 4/18/14
RF Bypass
Page 2 of 2
Millimeters
Inches
Min
Nom
Max
Min
Nom
Max
4.87
5.00
5.13
0.191
0.196
0.201
B
3.37
3.50
3.63
0.132
0.137
0.142
C
1.45
1.53
1.60
0.057
0.060
0.062
D
1.35
1.43
1.50
0.040
0.057
0.059
E
0.67
0.80
0.93
0.026
0.031
0.036
F
0.37
0.50
0.63
0.014
0.019
0.024
G
1.07
1.20
1.33
0.042
0.047
0.052
H
-
1.04
-
-
0.041
-
I
-
1.46
-
-
0.058
-
J
-
3.01
-
-
0.119
-
K
-
1.44
-
-
0.057
-
L
-
1.92
-
-
0.076
-
www.murata.com
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement