RO2125A
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RO2125A - RO2125A
RO2125A
Ideal Superhet Receivers Very Series Resistance Quartz Stability Surface-Mount, Ceramic Case with Footprint
RO2125A true one-port, surface-acoustic-wave (SAW) resonator surface-mount ceramic case. provides reliable, fundamental-mode, quartz frequency stabilization local oscillators operating approximately 304.3 MHz. This designed superhet receivers with 10.7 Applications include automotive keyless-entry receivers operating under Part Canada under RSS-210, Italy.
304.3 Resonator
Absolute Maximum Ratings
Rating Power Dissipation Voltage Between Terminals Case Temperature Soldering Temperature Value +250 Units
SM-2 Case
Electrical Characteristics
Characteristic Nominal Frequency Tolerance from 304.300 Insertion Loss Quality Factor Temperature Stability Unloaded Loaded Turnover Temperature Turnover Frequency Frequency Temperature Coefficient Frequency Aging Equivalent Model Absolute Value during First Year Motional Resistance Motional Inductance Motional Capacitance Transducer Static Capacitance Test Fixture Shunt InducLid Symbolization Insulation Resistance between Terminals LTEST |fA| 84.9591 3.21978 Notes Minimum 304.225 Typical Maximum 304.375 16,000 1,500 0.032 ppm/°C2 ppm/yr Units
Frequency (+25
CAUTION: Electrostatic Sensitive Device. Observe precautions handling. Notes:
Frequency aging change with time specified +65°C less. Aging exceed specification prolonged temperatures above +65°C. Typically, aging greatest first year after manufacture, decreasing subsequent years. center frequency, measured minimum insertion loss point, ILMIN, with resonator test system (VSWR 1.2:1). shunt inductance, LTEST, tuned parallel resonance with Typically, fOSCILLATOR fTRANSMITTER approximately equal resonator more following United States patents apply: 4,454,488 4,616,197. Typically, equipment utilizing this device requires emissions testing government approval, which responsibility equipment manufacturer. Unless noted otherwise, case temperature +25°C±2°C. design, manufacturing process, specifications this device subject change without notice. Derived mathematically from more following directly measured parameters: bandwidth, versus Turnover temperature, temperature maximum turnover) frequency, nominal frequency case temperature, calculated from: -TC)2]. Typically oscillator approximately equal specified resonator This equivalent model approximates resonator performance near resonant frequency provided reference only. capacitance static (nonmotional) capacitance between terminals measured frequency MHz) with capacitance meter. measurement includes parasitic capacitance with "NC" pads unconnected. Case parasitic capacitance approximately 0.05 Transducer parallel capacitance calculated 0.05
Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 Europe Phone: 1963 251383 Fax: 1963 251510 ©1999 Monolithics, Inc. stylized logo registered trademarks Monolithics, Inc.
E-mail: info@rfm.com http://www.rfm.com RO2125A-062001
Page
304.3
Electrical Connections
resonator bidirectional installed with either orientation. terminals interchangeable unnumbered. callout indicates internal connection. pads assist with mechanical positioning stability. External grounding pads recommended help reduce parasitic capacitance circuit.
Resonator
Terminal
Equivalent Model
0.05
0.05 *Case Parasitics
Terminal
Temperature Characteristics
curve shown right
(f-fo (ppm)
Typical Test Circuit
test circuit inductor, LTEST, tuned resonate with static capacitance,
accounts resonator contribution only does include component temperature contributions.
-100 -150 -200
-100
-150 -200
ELECTRICAL TEST
From Network Analyzer
Network Analyzer
Typical Circuit Board Land Pattern
circuit board land pattern shown below possible design. optimum land pattern dependent circuit board assembly process which varies manufacturer. distance between adjacent land edges should maximum minimize parasitic capacitance. Trace lengths from terminal lands other components should short wide minimize parasitic series inductances.
Places) Typical Dimension: 0.010 0.047 inch (0.25 1.20
Case Design
case material black alumina with contrasting symbolization. pads nominally centered with respect base consist microinches (min) electroless gold micorinches (min) electroless nickel.
Typical Application Circuits
Typical Low-Power Transmitter Application
+9VDC
Modulation Input
200k
(Antenna)
ROXXXXA Bottom View
Bypass
Millimeters Dimensions
Output
Inches 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
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
+VDC
+VDC
ROXXXXA Bottom View
Bypass
Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 Europe Phone: 1963 251383 Fax: 1963 251510 ©1999 Monolithics, Inc. stylized logo registered trademarks Monolithics, Inc.
E-mail: info@rfm.com http://www.rfm.com RO2125A-062001
Page
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