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RO2125A-5
* * * * * Ideal for 315 MHz Superhet Receivers Very Low Series Resistance Quartz Stability Surface-Mount, Ceramic Case with 21 mm2 Footprint Complies with Directive 2002/95/EC (RoHS)
The RO2125A-5 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 304.3 MHz. This SAW is designed for 315 MHz superhet receivers with 10.7 MHz IF. Applications include automotive keyless-entry receivers operating in the USA under FCC Part 15, in Canada under DOC RSS-210, and in Italy.
304.3 MHz SAW Resonator
Absolute Maximum Ratings
Rating CW RF Power Dissipation DC Voltage Between Terminals Case Temperature Soldering Temperature (10 seconds / 5 cycles max.) Value +0 30 -40 to +85 260 Units dBm VDC C C
SM-2 Case
Electrical Characteristics
Characteristic Nominal Frequency Tolerance from 304.300 MHz Insertion Loss Quality Factor Temperature Stability Unloaded Q 50 Loaded Q Turnover Temperature Turnover Frequency Frequency Temperature Coefficient Frequency Aging RF Equivalent RLC Model Absolute Value during the First Year Motional Resistance Motional Inductance Motional Capacitance Transducer Static Capacitance Test Fixture Shunt InducLid Symbolization DC Insulation Resistance between Any Two Terminals RM LM CM CO LTEST 5, 6, 7, 9 2, 7 1.85 102.04 184 5, 6, 7, 9 Sym fC fC IL QU QL TO fO FTC |fA| 1, 6 5 1.0 14.80 159.50 1.60 2.3 107.22 2.45 134.38 20.78 6, 7, 8 Notes 2, 3, 4, 5 2, 5, 6 5, 6, 7 10 Minimum 304.25 Typical Maximum 304.35 50 0.9 21,650 2,800 25 fC 0.032 10 40 C kHz ppm/C2 ppm/yr M H fF pF nH 1.5 Units MHz kHz dB
Frequency (+25 C)
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. Notes:
1. Frequency aging is the change in fC with time and is specified at +65C or less. Aging may exceed the specification for prolonged temperatures above +65C. 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 = +25C2C. 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: fC, IL, 3 dB bandwidth, fC versus TC, and CO. 8. 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.
2.
9.
3. 4. 5. 6. 7.
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-8148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 (c)1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com http://www.rfm.com RO2125A-5-062001
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304.3 MHz
Electrical Connections
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.
SAW Resonator
Equivalent LC Model
Terminal
0.05 pF*
NC
NC
Co = Cp + 0.05 pF Cp *Case Parasitics
Terminal
Rm
Lm
Cm
Temperature Characteristics
The curve shown on the right
fC = f O , T C = T O
0
(f-fo ) / fo (ppm)
Typical Test Circuit
The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC.
accounts for resonator contribution only and does not include LC component temperature contributions.
0 -50 -100 -150 -200 0 +20 +40 +60 +80
-50
-100
-150 -200 -80 -60 -40 -20
ELECTRICAL TEST
From 50 Network Analyzer
To 50
Network Analyzer
Typical Circuit Board Land Pattern
T = T C - T O ( C )
The circuit board land pattern shown below is one possible design. The optimum land pattern is dependent on the circuit board assembly process which varies by manufacturer. The distance between adjacent land edges should be at a maximum to minimize parasitic capacitance. Trace lengths from terminal lands to other components should be short and wide to minimize parasitic series inductances.
(4 Places) Typical Dimension: 0.010 to 0.047 inch (0.25 to 1.20 mm)
Case Design
The case material is black alumina with contrasting symbolization. All pads are nominally centered with respect to the base and consist of 40 to 70 microinches electroless gold on 60-350 micorinches electroless nickel.
Typical Application Circuits
Typical Low-Power Transmitter Application
+9VDC
Modulation Input
200k C1 L1
47
(Antenna)
ROXXXXA Bottom View 470
C2 RF Bypass
Millimeters Dimensions Min A B C D
Output
Inches Min 0.226 0.147 0.075 0.037 0.033 0.046 0.037 0.017 0.017 0.200 0.015 0.120 Max 0.236 0.157 0.085 0.043 0.047 0.060 0.043 0.023 0.023 0.210 0.025 0.130
Max 5.99 3.99 2.16 1.10 1.20 1.53 1.10 0.59 0.59 5.33 0.64 3.30
5.74 3.73 1.91 0.94 0.83 1.16 0.94 0.43 0.43 5.08 0.38 3.05
Typical Local Oscillator Application
E F G H K M N
+VDC
C1 L1
+VDC
ROXXXXA Bottom View
C2 RF Bypass
P
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-8148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 (c)1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com http://www.rfm.com RO2125A-5-062001
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