RO3073E-1 [MURATA]
315.00 MHz SAW Resonator;
muRata 
RO3073E-1
•
•
•
•
Ideal for 315 MHz Automotive-Keyless-Entry Transmitters
Very Low Series Resistance
315.0 MHz
SAW
Resonator
Quartz Stability
Pb
Complies with Directive 2002/95/EC (RoHS)
The RO3073E-1 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 local oscillators operating at
approximately 315 MHz. This SAW was designed for AM transmitters in automotive-keyless-entry applica-
tions operating in the USA under FCC Part 15, in Canada under DoC RSS-210, and in Italy.
Absolute Maximum Ratings
Rating
Value
0
Units
dBm
VDC
°C
Input Power Level
DC Voltage
12
Storage Temperature Range
Operating Temperature Range
-40 to +125
-40 to +105
260
°C
SM3030-6 Case
3.0 X 3.0
Soldering Temperature (10 seconds / 5 cycles max.)
°C
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
f
314.950
315.050
MHz
Frequency (+25 °C)
Absolute Frequency
C
2, 3, 4, 5
∆f
Tolerance from 315.0 MHz
±50
2.4
kHz
dB
C
Insertion Loss
Quality Factor
IL
2, 5, 6
1.6
8200
1350
25
Q
Unloaded Q
U
Q
T
50 Ω Loaded Q
L
Temperature Stability
Turnover Temperature
Turnover Frequency
10
35
°C
O
f
f
6, 7, 8
O
C
2
Frequency Temperature Coefficient
Absolute Value during the First Year
FTC
0.032
10
ppm/°C
|f |
Frequency Aging
1, 6
5
ppm/yr
MΩ
Ω
A
DC Insulation Resistance between Any Two Terminals
1.0
R
RF Equivalent RLC Model
Motional Resistance
Motional Inductance
Motional Capacitance
Shunt Static Capacitance
19.8
82
M
L
5, 7, 9
µH
M
C
3.1
4.1
63
fF
M
C
5, 6, 9
2, 7
pF
O
L
Test Fixture Shunt Inductance
Lid Symbolization
nH
TEST
802 // YWWS
Reel Size 7 Inch
Reel Size 13 Inch
500 Pieces / Reel
3000 Pieces / Reel
StandardReelQuantity
10
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
2.
Frequency aging is the change in fC with time and is specified at +65°C or less.
7.
8.
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) fre-
Aging may exceed the specification for prolonged temperatures above +65°C.
Typically, aging is greatest the first year after manufacture, decreasing in subse-
quent years.
quency, fO. The nominal frequency at any case temperature, TC, may be calcu-
The center frequency, fC, is measured at the minimum insertion loss point, ILMIN
,
lated 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 reso-
nant frequency and is provided for reference only. The capacitance CO is the
static (nonmotional) capacitance between the two terminals measured at low fre-
quency (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.
with the resonator in the 50 Ω test system (VSWR ≤ 1.2:1). The shunt induc-
tance, LTEST, is tuned for parallel resonance with CO at fC. Typically, fOSCILLA-
TOR 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 govern-
ment approval, which is the responsibility of the equipment manufacturer.
Unless noted otherwise, case temperature TC = +25°C±2°C.
The design, manufacturing process, and specifications of this device are subject
to change without notice.
9.
3.
4.
5.
6.
10. Tape and Reel Standard Per ANSI / EIA 481.
www.RFM.com E-mail: info@rfm.com
©2009 by RF Monolithics, Inc.
Page 1 of 2
RO3073E-1 8/13/09
315.0 MHz
SAW Resonator
Power Test
Electrical Connections
Pin
1
Connection
NC
The SAW resonator is bidirectional and
may be installed with either orientation.
The two terminals are interchangeable
and unnumbered. The callout NC indi-
cates 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.
2
Terminal
NC
PINCIDENT
Low-Loss
Matching
Network to
3
50 Source
Ω
2
5
3
4
1
4
NC
at FC
6
5
Terminal
NC
PREFLECTED
50
Ω
6
Typical Application Circuits
B
C
G
H
Typical Low-Power Transmitter Application
1
2
3
6
5
4
6
5
4
1
200k
Ω
+9VDC
Modulation
Input
C1
47
A
E
F
2
I
L1
(Antenna)
2
5
3
4
1
3
6
D
J
C2
ROXXXXC
Bottom View
RF Bypass
470
Typical Local Oscillator Application
Output
200k
Ω
+VDC
Case Dimensions
Dimension
C1
+VDC
mm
Nom
3.0
Inches
Nom
L1
Min
Max
3.13
3.13
1.38
1.03
2.93
1.73
0.98
1.63
0.73
1.43
Min
Max
2
5
3
1
A
B
C
D
E
F
G
H
I
2.87
2.87
1.12
0.77
2.67
1.47
0.72
1.37
0.47
1.17
0.113
0.113
0.044
0.030
0.105
0.058
0.028
0.054
0.019
0.046
0.118
0.118
0.049
0.035
0.110
0.063
0.033
0.059
0.024
0.051
0.123
0.123
0.054
0.040
0.115
0.068
0.038
0.064
0.029
0.056
3.0
6
4
1.25
0.90
2.80
1.6
C2
ROXXXXC
Bottom View
RF Bypass
0.85
1.5
Equivalent LC Model
0.60
1.30
0.05 pF*
J
+
C
p
=
C
o
0.05 pF
C
p
Typical Test Circuit
*Case Parasitics
The test circuit inductor, L
, is tuned to resonate with the static
TEST
capacitance, C , at F .
O
C
Lm
C m
Rm
Electrical Test
Temperature Characteristics
The curve shown on the right accounts for resonator contribution only and
does not include LC component temperature contributions.
fC = fO , TC = TO
0
0
6
1
-50
-50
From 50
Network Analyzer
Ω
To 50
Ω
Network Analyzer
5
4
2
-100
-150
-100
-150
-200
3
-200
-80 -60 -40 -20
0
+40 +60 +80
+20
T = T - T ( °C )
∆
C
O
www.RFM.com E-mail: info@rfm.com
©2009 by RF Monolithics, Inc.
Page 2 of 2
RO3073E-1 8/13/09
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