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RO3156A-2 Datasheet(PDF) 2 Page - RF Monolithics, Inc |
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RO3156A-2 Datasheet(HTML) 2 Page - RF Monolithics, Inc |
2 / 2 page www.RFM.com E-mail: info@rfm.com Page 2 of 2 ©2008 by RF Monolithics, Inc. RO3156A - 3/27/08 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. Typical Test Circuit The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC. Typical Application Circuits Equivalent LC Model Temperature Characteristics The curve shown on the right accounts for resonator contribution only and does not include LC component temperature contributions. Typical Circuit Board Land Pattern 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. Case Design Terminal Terminal ELECTRICAL TEST From 50 Ω Network Analyzer To 50 Ω Network Analyzer 50 Ω Source at F C REFLECTED INCIDENT P P Low-Loss Matching Network to 50 Ω Terminal Terminal NC NC POWER TEST CW RF Power Dissipation = INCIDENT - REFLECTED P P C1 C2 L1 (Antenna) +9VDC 47 RF Bypass Modulation Input Typical Low-Power Transmitter Application RO3XXXA Bottom View 470 200k Ω C1 C2 L1 Output +VDC RF Bypass +VDC Typical Local Oscillator Applications RO3XXXA Bottom View Dimensions Millimeters Inches Min Nom Max Min Nom Max A 4.87 5.0 5.13 .191 .196 .201 B 3.37 3.5 3.63 .132 .137 .142 C 1.45 1.53 1.60 .057 .060 .062 D 1.35 1.43 1.50 .040 .057 .059 E .67 .80 .93 .026 .031 .036 F .37 .50 .63 .014 .019 .024 G 1.07 1.20 1.33 .042 .047 .052 0.05 pF* 0.05 pF Cp Co + = *Case Parasitics Cp Rm Lm Cm -80 -60 -40 -20 0 +20 +40 +60 0 -50 -100 -150 +80 -200 0 -50 -100 -150 -200 f C = f O , T C = T O ΔT = T C - T O ( °C ) Typical Dimension: 0.010 to 0.047 inch (0.25 to 1.20 mm) (4 Places) B C D E (3x) F (4x) G (1x) Top View Side View Bottom View 1 2 3 4 |
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