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RO2073C 315.0 MHz SAW Resonator
* * * *
Ideal for 315 MHz Automotive-Keyless-Entry Transmitters Very Low Series Resistance Quartz Stability Pb Complies with Directive 2002/95/EC (RoHS)
The RO2073C 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 applications operating in the USA under FCC Part 15, in Canada under DoC RSS-210, and in Italy.
Absolute Maximum Ratings
Rating Input Power Level DC Voltage Storage Temperature Soldering Temperature (10 seconds / 5 cycles max.) Value 0 12 -40 to +85 260 Units dBm VDC C C
SM5050-8 Case 5X5
Typical Maximum 315.100 100 1.6 10500 1400 10 25 fC 0.032 10 ppm/C2 ppm/yr M 15.67 H fF pF nH 82.0 3.11 3.31 77.00 412 // YWWS 500 Pieces / Reel 3000 Pieces / Reel 40 C 2.5 Units MHz kHz dB
Electrical Characteristics
Characteristic Absolute Frequency Tolerance from 315.0 MHz Insertion Loss Quality Factor Temperature Stability Unloaded Q 50W 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 Shunt Static Capacitance Test Fixture Shunt Inductance Lid Symbolization Standard Reel Quantity Reel Size 7 Inch Reel Size 13 Inch DC Insulation Resistance between Any Two Terminals RM LM CM CO LTEST 5, 6, 9 2, 7 5, 7, 9 Sym fC fC IL QU QL TO fO FTC |fA| 1, 6 5 1.0 6, 7, 8 Notes 2, 3, 4, 5 2, 5, 6 Minimum 314.900
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. 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) 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.
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 RO2073C-040103
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315.0 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. Pin 1 2 3 4 5 6 7 8
SAW Resonator
Connection NC Terminal NC NC NC Terminal NC NC
NC NC
Power Test
NC NC
50 Source at F C
P INCIDENT
P REFLECTED
Low-Loss Matching Network to 50
1
2 8 4
3
NC
7
NC
6
5
Typical Application Circuits
B 8 C E 8 D7 6 5
Modulation Input
Typical Low-Power Transmitter Application
200k C1 L1
(Antenna)
+9VDC
1 A 2 3
7 6 5
1 2 3
7
ROXXXXC Bottom View
47
G
1
2 8 6 4
3
5
C2
4
4 F
RF Bypass
470
Typical Local Oscillator Application
Output
Case Dimensions
Dimension A B C D E F G Min 4.8 4.8 mm Nom 5.0 5.0 2.08 1.17 0.64 2.54 Max 5.2 5.2 1.7 Min 0.189 0.189 Inches Nom 0.197 0.197 0.082 0.046 0.025 0.100 Max 0.205 0.205 0.067
200k +VDC C1 L1 +VDC
1
2 8 4 5
3
7
ROXXXXC Bottom View
6
C2 RF Bypass
2.39
2.69
0.094
0.106
Equivalent LC Model
0.05 pF* Co = Cp + 0.05 pF Cp *Case Parasitics
Typical Test Circuit
The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC.
Electrical Test
Rm Lm Cm
Temperature Characteristics
The curve shown on the right accounts for resonator contribution only and does not include LC component temperature contributions.
7
From 50 Network Analyzer
1 8 4 2 3
To 50 Network Analyzer
6 5
fC = f O , T C = T O
0
(f-fo ) / fo (ppm)
0 -50 -100 -150 -200 0 +20 +40 +60 +80
-50
-100
-150 -200 -80 -60 -40 -20
T = TC - T O ( C )
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 RO2073C-040103
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