Preliminary
RO2136A
" Ideal for 433.92 MHz Superhet Receiver LOs
" Very Low Series Resistance
432.920 MHz
" Quartz Stability
" Surface-Mount Ceramic Case with 21 mm2 Footprint
SAW
The RO2136A is a true one-port, surface-acoustic-wave (SAW) resonator in a low profile surface-mount
Resonator
ceramic case. It provides reliable, fundamental-mode, quartz frequency stabilization of local oscillators oper-
ating at approximately 432.920 MHz. This SAW is designed specifically for remote-control and wireless
security receivers operating in Europe under ETSI I-ETS 300 220 and in Germany under FTZ 17 TR 2100.
Absolute Maximum Ratings
Rating Value Units
CW RF Power Dissipation +10 dBm
DC Voltage Between Terminals Ä…30 VDC
-40 to +85 °C
Case Temperature
SM-2 Case
Soldering Temperature +250 °C
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Center Frequency at +25 °C Absolute Frequency fC 2, 3, 4, 5 432.845 432.995 MHz
Tolerance from 432.920 MHz "fC Ä…75 kHz
Insertion Loss IL 2, 5, 6 1.5 dB
Quality Factor Unloaded Q QU 1.3
5, 6, 7
50 &! Loaded Q QL 15.650
Temperature Stability Turnover Temperature TO 10 25 40 °C
Turnover Frequency fO 6, 7, 8 fc
Frequency Temperature Coefficient FTC 0.032
ppm/°C2
Frequency Aging Absolute Value during the First Year |fA| 1 d"10 ppm/yr
DC Insulation Resistance between Any Two Terminals 5 1.0 M&!
RF Equivalent RLC Model Motional Resistance RM 16 19 &!
Motional Inductance LM 5, 7, 9 92.0548 µH
Motional Capacitance CM 1.46818 fF
Transducer Static Capacitance CO 5, 6, 9 1.4 1.7 2.0 pF
Test Fixture Inductance LTEST 2,7 79 nH
Lid Symbolization 143
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Lifetime (10 year) frequency aging.
culated from: f =fO [1- FTC(TO -TC)2].
2. The center frequency, fC, is measured at the minimum insertion loss point,
9. This equivalent RLC model approximates resonator performance near the
ILMIN, with the resonator in the 50 &! test system (VSWR d" 1.2:1). The shunt
resonant frequency and is provided for reference only. The capacitance CO is
inductance, LTEST, is tuned for parallel resonance with CO at fC.
the static (nonmotional) capacitance between the two terminals measured at
3. One or more of the following United States patents apply: 4,454,488 and
low frequency (10 MHz) with a capacitance meter. The measurement
4,616,197.
includes parasitic capacitance with NC pads unconnected. Case parasitic
4. Typically, equipment utilizing this device requires emissions testing and gov-
capacitance is approximately 0.05pF. Transducer parallel capacitance can be
ernment approval, which is the responsibility of the equipment manufacturer.
calculated as: CP H" Cź - 0.05 pF.
5. Unless noted otherwise, case temperature TC =+25°CÄ…2°C for all specifica-
tions.
6. The design, manufacturing process, and specifications of this device are sub-
ject to change without notice.
7. Derived mathematically from one or more of the following directly measured
parameters: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
8. Turnover temperature, TO, is the temperature of maximum (or turnover) fre-
quency, fO. The nominal frequency at any case temperature, TC, may be cal-
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 E-mail: info@rfm.com Page 1 of 2
RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 http://www.rfm.com
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. RO2136A-110299
432.920 MHz SAW Resonator
Electrical Connections Equivalent LC Model
Terminal
The SAW resonator is bidirectional and may be in-
0.05 pF*
stalled with either orientation. The two terminals
NC NC
Co= Cp +
0.05 pF
are interchangeable and unnumbered. The callout
Cp
NC indicates no internal connection. The NC pads
*Case Parasitics
Terminal
assist with mechanical positioning and stability.
External grounding of the NC pads is recommend-
Rm Lm Cm
ed to help reduce parasitic capacitance in the cir-
cuit. Temperature Characteristics
The curve shown on the right
fC = fO , TC = TO
0 0
Typical Test Circuit accounts for resonator contri-
-50 -50
The test circuit inductor, LTEST, is tuned to resonate with the static capaci- bution only and does not in-
-100 -100
tance, CO, at FC.
clude LC component tempera-
-150
-150
ture contributions.
-200 -200
-80 -60 -40 -20 0 +20 +40 +60 +80
ELECTRICAL TEST
Typical Circuit Board
"T = TC - TO ( °C )
Land Pattern
&! &!
From 50 To 50
The circuit board land pattern shown below is one possible design. The op-
Network Analyzer Network Analyzer
timum 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 mini-
mize 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 mi-
croinches (min) electroless gold on 50 micorinches (min) electroless nickel.
Typical Application Circuits
Typical Low-Power Transmitter Application
+9VDC
200k &!
47
Modulation
C1
Input
L1
(Antenna)
C2
ROXXXXA
Millimeters Inches
Bottom View RF Bypass
Dimensions
Min Max Min Max
470
A 5.97 0.235
B 3.94 0.155
C 2.16 0.085
Typical Local Oscillator Application
D 0.94 1.10 0.037 0.043
Output
E 0.83 1.20 0.033 0.047
F 1.16 1.53 0.046 0.060
+VDC
+VDC
C1 G 0.94 1.10 0.037 0.043
L1
H 0.43 0.59 0.017 0.023
K 0.43 0.59 0.17 0.023
M 5.31 0.209
C2
ROXXXXA
N 0.38 0.64 0.015 0.025
Bottom View RF Bypass
P 3.28 0.129
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 E-mail: info@rfm.com Page 2 of 2
RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 http://www.rfm.com
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. RO2136A-110299
(ppm)
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(f-f ) f
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