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Ideal for European 868.35 MHz Transmitters Very Low Series Resistance Quartz Stability Surface-Mount Ceramic Case with 21 mm2 Footprint
RO2164A RO2164A-1 RO2164A-2 868.35 MHz SAW Resonator
The RO2164A 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 868.35 MHz. This SAW is designed specifically for remote-control and wireless security transmitters operating under ETSI-ETS 300 220 in Europe and under FTZ 17 TR 2100 in Germany.
Absolute Maximum Ratings
Rating CW RF Power Dissipation DC Voltage Between Terminals Case Temperature Soldering Temperature Value +5 30 -40 to +85 +250 Units dBm VDC C C
SM-2 Case
Electrical Characteristics
Frequency (+25 C) RO2164A RO2164A-1 RO2164A-2 Tolerance from 868.35 MHz RO2164A RO2164A-1 RO2164A-2 Characteristic Nominal Frequency Sym fC 2,3,4,5 fC IL QU QL TO fO FTC |fA| RM LM CM CO LTEST 2,5,6 5,6,7 10 6,7,8 1 5 5, 6, 7, 9 5, 6, 9 2, 7 1.1 24,737 4,000 25 fC 0.032 <10 1.0 19.2889 87.455 0.3841 3.1 10.8365 260 Notes Minimum 868.275 868.200 868.250 Typical Maximum 868.425 868.500 868.450 75 150 100 2.0 Units MHz
kHz dB
Unloaded Q 50 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 (in addition to Lot and/or Date Codes)
Insertion Loss Quality Factor
40
C kHz ppm/C2 ppm/yr M H fF pF nH
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 7. 8. 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. 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. E-mail: info@rfm.com Page 1 of 2 http://www.rfm.com RO2164A_RO2164A-1_RO2164A-2_071101
2.
3. 4. 5. 6.
9.
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 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.
868.35 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 60 to 100 microinches (min) electroless gold on 50 micorinches (min) 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 Max 0.235 0.155 0.085 0.037 0.033 0.046 0.037 0.017 0.017 0.015 0.043 0.047 0.060 0.043 0.023 0.023 0.209 0.025 0.129
Max 5.97 3.94 2.16
Typical Local Oscillator Application
0.94 0.83 1.16 0.94 0.43 0.43 0.38
1.10 1.20 1.53 1.10 0.59 0.59 5.31 0.64 3.28
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) 387-9148 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 Page 2 of 2 http://www.rfm.com RO2164A_RO2164A-1_RO2164A-2_071101

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