RO2073D ® • • • • Ideal for 315 MHz Automotive-Keyless-Entry Transmitters Very Low Series Resistance Quartz Stability Complies with Directive 2002/95/EC (RoHS) Pb 315.0 MHz SAW Resonator The RO2073D 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 Value Units Input Power Level 0 dBm DC Voltage 12 VDC -40 to +85 °C 260 °C Storage Temperature Soldering Temperature (10 seconds / 5 cycles max.) SM3838-6 Case 3.8 X 3.8 Electrical Characteristics Frequency (+25 °C) Characteristic Absolute Frequency Sym fC Tolerance from 315.0 MHz Insertion Loss Quality Factor Temperature Stability Frequency Aging Notes ∆fC 2, 3, 4, 5 IL 2, 5, 6 1.6 QU 6500 50W Loaded Q QL 1100 Turnover Temperature TO Turnover Frequency fO 10 Frequency Temperature Coefficient FTC |fA| Maximum 315.100 Units MHz ±100 kHz 2.5 dB 40 °C 25 fC 6, 7, 8 Absolute Value during the First Year ppm/°C2 ppm/yr 0.032 1, 6 5 Motional Resistance RM Motional Inductance LM Motional Capacitance CM Shunt Static Capacitance CO 5, 6, 9 LTEST 2, 7 Test Fixture Shunt Inductance 10 1.0 MΩ 20.67 5, 7, 9 29 67.0 3.65 Ω µH 4.00 3.5 Lid Symbolization Standard Reel Quantity Typical Unloaded Q DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model Minimum 314.900 fF 4.5 64.6 pF nH 442 // YWWS Reel Size 7 Inch 500 Pieces / Reel Reel Size 13 Inch 3000 Pieces / Reel CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. Notes: 1. 2. 3. 4. 5. 6. 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 subsequent years. The center frequency, fC, is measured at the minimum insertion loss point, ILMIN, with the resonator in the 50 Ω 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 = +25°C±2°C. The design, manufacturing process, and specifications of this device are subject to change without notice. 7. 8. 9. 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. RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-8148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 ©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. E-mail: [email protected] http://www.rfm.com RO2073D-040103 Page 1 of 2 315.0 MHz SAW Resonator 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 Connection 1 NC 2 Terminal 3 NC 4 NC 5 Terminal 6 NC Power Test 50 Ω Source at F C P INCIDENT Low-Loss Matching Network to 50 Ω P REFLECTED 1 6 2 3 5 4 Typical Application Circuits B C G H Typical Low-Power Transmitter Application 200k Ω 6 1 6 A 2 5 3 4 E 5 2 4 3 +9VDC Modulation Input 1 C1 (Antenna) 1 6 D 47 L1 I 2 3 5 4 J C2 ROXXXXC Bottom View RF Bypass 470 Typical Local Oscillator Application Case Dimensions Dimension A B C D E G H I J Min 3.60 3.60 1.00 0.95 2.39 0.90 1.90 0.50 1.70 Output 200k Ω +VDC mm Nom 3.80 3.80 1.20 1.10 2.54 1.0 2.0 0.6 1.8 Max 4.0 4.0 1.40 1.25 2.69 1.10 2.10 0.70 1.90 Min 0.14 0.14 0.04 0.037 0.090 0.035 0.75 0.020 0.067 Inches Nom 0.15 0.15 0.05 0.043 0.10 0.04 0.08 0.024 0.07 C1 +VDC L1 Max 0.16 0.16 0.055 0.05 0.110 0.043 0.83 0.028 0.075 1 6 2 3 5 4 C2 ROXXXXC Bottom View RF Bypass Equivalent LC Model 0.05 pF* Typical Test Circuit Co = Cp + 0.05 pF Cp The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC. Electrical Test Rm Lm *Case Parasitics Cm Temperature Characteristics The curve shown on the right accounts for resonator contribution only and does not include LC component temperature contributions. fC = f O , T C = T O 0 6 1 5 2 4 3 To 50 Ω Network Analyzer -50 -50 -100 -100 -150 -150 (f-fo ) / fo (ppm) From 50 Ω Network Analyzer 0 -200 -80 -60 -40 -20 -200 0 +20 +40 +60 +80 ∆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 ©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. E-mail: [email protected] http://www.rfm.com RO2073D-040103 Page 2 of 2