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.
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