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RO2073A-6
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Ideal for 315.0 MHz Automotive-Keyless-Entry Transmitters
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Very Low Series Resistance
Quartz Stability
Surface-Mount Ceramic Case with 21 mm 2 Footprint
Complies with Directive 2002/95/EC (RoHS)
315.0 MHz
SAW
The RO2073A-6 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 315.0 MHz. This SAW is designed for AM transmitters in automotive keyless-entry applications
operating in the USA under FCC Part 15, in Canada under DoC RSS-210, and in Italy.
Absolute Maximum Ratings
Resonator
Rating
CW RF Power Dissipation (See: Typical Test Circuit)
DC voltage Between Terminals
Value
+0
±30
Units
dBm
VDC
Case Temperature
Soldering Temperature (10 seconds / 5 cycles max.)
-40 to +85
260
°C
°C
SM-2 Case
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Center Frequency (+25 °C)
Insertion Loss
Quality Factor
Absolute Frequency
Tolerance from 315.000 MHz
Unloaded Q
50 ? Loaded Q
f C
? f C
IL
Q U
Q L
2,3,4,5
2,5,6
5,6,7
314.950
1.3
15,300
2,100
315.050
±50
2.2
MHz
kHz
dB
Temperature Stability
Turnover Temperature
T O
10
25
40
°C
Turnover Frequency
f O
6,7,8
f C
Frequency Temperature Coefficient
FTC
0.032
ppm/°C 2
Frequency Aging
Absolute Value during the First Year
|f A |
1
≤ 10
ppm/yr
DC Insulation Resistance between Any Two Terminals
5
1.0
M ?
RF Equivalent RLC Model
Motional Resistance
Motional Inductance
Motional Capacitance
R M
L M
C M
5, 7, 9
16
127.450
2.00299
26
?
μH
fF
Test Fixture Shunt Inductance
Shunt Static Capacitance
C O
L TEST
5, 6, 9
2, 7
2.0
2.3
110
2.6
pF
nH
Lid Symbolization (in addition to Lot and/or Date Codes)
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
164
1.
2.
3.
4.
5.
6.
7.
8.
9.
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 temperatures 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 ? 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 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.
www.RFM.com E-mail: info@rfm.com
?2008 by RF Monolithics, Inc.
Page 1 of 2
RO2073A-6 - 1/7/10
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