RO2166A-2资料

Preliminary®•••••Ideal for European 857.65 MHz Transmitters Very Low Series ResistanceQuartz Stability

Surface-Mount Ceramic Case with 21 mm2 FootprintComplies with Directive 2002/95/EC (RoHS)

RO2166ARO2166A-1RO2166A-2857.65 MHz

SAW Resonator

The RO2166A 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 857.65MHz. This SAW is designed for 868.35 MHz superhet receivers with 10.7 MHz IF. Applications includeremote-control and wireless security receivers operating under ETSI-ETS 300 220 in Europe and under FTZ17 TR 2100 in Germany.

Absolute Maximum Ratings

Rating

CW RF Power DissipationDC Voltage Between TerminalsCase TemperatureSoldering Temperature (10 seconds / 5 cycles max.)

Value+0±30-40 to +85260

UnitsdBmVDC°C°C

SM-2 Case Electrical Characteristics

Frequency (+25 °C)CharacteristicNominal FrequencySymRO2166ARO2166A-1RO2166A-2RO2166ARO2166A-1RO2166A-2

fC

Notes2, 3, 4, 5

Minimum857.575857.500857.550TypicalMaximum857.725857.800857.750±75±150±1002.0UnitsMHz

Tolerance from 857.65 MHz∆fCILQUQLTOfOFTC|fA|RMLMCMCOLTEST

2, 5, 65, 6, 7

156, 7, 8155, 6, 7, 95, 6, 92, 72.81.124,7004,00030fC0.032101988.60.383.111.1086262kHzdBInsertion LossQuality FactorUnloaded Q50 Ω Loaded Q

Temperature StabilityTurnover TemperatureTurnover Frequency

Frequency Temperature Coefficient

Frequency AgingAbsolute Value during the First YearDC Insulation Resistance between Any Two TerminalsRF Equivalent RLC ModelMotional ResistanceMotional InductanceMotional Capacitance

Transducer Static Capacitance

Test Fixture Shunt InductanceLid Symbolization451.03.4°CkHzppm/°C2ppm/yrMΩΩµHfFpFnH CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.Notes:

1.

Frequency aging is the change in fC 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 subse-quent years.

The center frequency, fC, is measured at the minimum insertion loss point, ILMIN, with the resonator in the 50Ω test system (VSWR ≤ 1.2:1). The shunt inductance, LTEST, is tuned for parallel resonance with CO at fC. Typically, fOS-CILLATOR or fTRANSMITTER is approximately equal to the resonator fC.

One or more of the following United States patents apply: 4,4,488 and 4,616,197.

Typically, equipment utilizing this device requires emissions testing and govern-ment approval, which is the responsibility of the equipment manufacturer.Unless noted otherwise, case temperature TC=+25°C±2°C.

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, 3dB bandwidth, fC versus TC, and CO.

Turnover temperature, TO, is the temperature of maximum (or turnover) fre-quency, fO. The nominal frequency at any case temperature, TC, may be calcu-lated 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 reso-nant frequency and is provided for reference only. The capacitance CO is the static (nonmotional) capacitance between the two terminals measured at low frequency (10MHz) with a capacitance meter. The measurement includes para-sitic capacitance with \"NC” pads unconnected. Case parasitic capacitance is approximately 0.05pF. Transducer parallel capacitance can by calculated as: CP≈CO-0.05pF.

2.

9.

3.4.5.6.

RF Monolithics, Inc.Phone: (972) 233-2903Fax: (972) 387-8148RFM EuropePhone: 44 1963 251383Fax: 44 1963 251510

©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.E-mail: info@rfm.comhttp://www.rfm.comRO2166A-050901

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857.65 MHz SAW Resonator

Electrical Connections

The SAW resonator is bidirectional and may be in-stalled with either orientation. The two terminalsare interchangeable and unnumbered. The calloutNC indicates no internal connection. The NC padsassist with mechanical positioning and stability.External grounding of the NC pads is recommend-ed to help reduce parasitic capacitance in the cir-cuit.

NCTerminalEquivalent LC Model

NCTerminalTemperature Characteristics

The curve shown on the rightaccounts for resonator contri-bution only and does not in-clude LC component tempera-ture contributions.

Typical Test Circuit

The test circuit inductor, LTEST, is tuned to resonate with the static capaci-tance, CO, at FC.

ELECTRICAL TESTΩFrom 50 Network AnalyzerTo 50 ΩTypical Circuit Board Land Pattern

The circuit board land pattern shown below is one possible design. The op-timum land pattern is dependent on the circuit board assembly processwhich varies by manufacturer. The distance between adjacent land edgesshould be at a maximum to minimize parasitic capacitance. Trace lengthsfrom terminal lands to other components should be short and wide to mini-mize parasitic series inductances.

Network AnalyzerCase Design

The case material is black alumina with contrasting symbolization. All padsare nominally centered with respect to the base and consist of 40 to70microinches electroless gold on 60-350 micorinches electroless nickel.

Typical Application CircuitsRF Monolithics, Inc.Phone: (972) 233-2903Fax: (972) 387-8148RFM EuropePhone: 44 1963 251383Fax: 44 1963 251510

©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.E-mail: info@rfm.comhttp://www.rfm.comRO2166A-050901

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