RO2131D Datasheet, PDF (1/2 Pages) RF Monolithics, Inc – 314.350 MHz SAW Resonator

RO2131D
• Ideal for 314.350 MHz Automotive-Keyless-Entry Transmitters
• Very Low Series Resistance
• Quartz Stability
• Complies with Directive 2002/95/EC (RoHS)
Pb
314.350 MHz
SAW
The RO2131D 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 314.350 MHz. This SAW was 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
Rating
Value
Units
Input Power Level
0
dBm
DC Voltage
12
VDC
Storage Temperature
-40 to +85
°C
Soldering Temperature (10 seconds / 5 cycles max.)
260
°C
Electrical Characteristics
Resonator
SM3838-6 Case
3.8 X 3.8
Characteristic
Frequency (+25 °C)
Absolute Frequency
Tolerance from 314.350 MHz
Insertion Loss
Quality Factor
Unloaded Q
50 Ω Loaded Q
Temperature Stability
Turnover Temperature
Turnover Frequency
Frequency Temperature Coefficient
Frequency Aging
Absolute Value during the First Year
DC Insulation Resistance between Any Two Terminals
RF Equivalent RLC Model Motional Resistance
Motional Inductance
Motional Capacitance
Shunt Static Capacitance
Test Fixture Shunt Inductance
Lid Symbolization
Standard Reel Quantity
Reel Size 7 Inch
Reel Size 13 Inch
Sym
f_C
Δf_C
IL
Q_U
Q_L
T_O
f_O
FTC
|f_A|
R_M
L_M
C_M
C_O
L_TEST
Notes
2, 3, 4, 5
Minimum
314.300
Typical
2, 5, 6
5, 6, 7
6, 7, 8
1, 6
5
5, 7, 9
5, 6, 9
2, 7
1.6
6516
1066
10
25
f_C
0.032
10
1.0
20.00
65.00
4.00
2.0
3.6
64.6
440 / YWWS
500 Pieces / Reel
3000 Pieces / Reel
Maximum
314.400
±50
2.5
40
Units
MHz
kHz
dB
°C
ppm/°C²
ppm/yr
MΩ
Ω
µH
fF
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 6. The design, manufacturing process, and specifications of this device are
less. Aging may exceed the specification for prolonged temperatures
subject to change without notice.
above +65°C. Typically, aging is greatest the first year after manufacture, ^{7. Derived mathematically from one or more of the following directly}
decreasing in subsequent years.
measured parameters: f_C, IL, 3 dB bandwidth, f_C versus T_C, and C_O.
2. The center frequency, f_C, is measured at the minimum insertion loss point, 8. Turnover temperature, T_O, is the temperature of maximum (or turnover)
IL_MIN, with the resonator in the 50 Ω test system (VSWR ≤ 1.2:1). The
frequency, f_O. The nominal frequency at any case temperature, T_C, may be
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.
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.
9. This equivalent RLC model approximates resonator performance near the
3. One or more of the following United States patents apply: 4,454,488 and
4,616,197.
4. Typically, equipment utilizing this device requires emissions testing and
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
government approval, which is the responsibility of the equipment
manufacturer.
measurement includes parasitic capacitance with "NC” pads unconnected.
Case parasitic capacitance is approximately 0.05 pF. Transducer parallel
5. Unless noted otherwise, case temperature T_C = +25°C±2°C.
capacitance can by calculated as: C_P ≈ C_O - 0.05 pF.
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©2008 by RF Monolithics, Inc.
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RO2131D - 3/25/08