RO2171
•
•
•
•
Ideal for 310.075 MHz Transmitters
Low Series Resistance
Quartz Stability
310.075 MHz
SAW
Resonator
Rugged, Hermetic, Low-Profile TO39 Case
The RO2171 is a true one-port, surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It pro-
vides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters operating at
310.075 MHz. The RO2171 is designed specifically for AM transmitters used 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
+0
Units
dBm
VDC
°C
CW RF Power Dissipation
DC Voltage Between Any Two Pins
Case Temperature
±30
TO39-3 Case
-40 to +85
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Center Frequency (+25 °C)
Absolute Frequency
f
310.025
310.125
MHz
C
2, 3, 4, 5
Tolerance from 310.075 MHz
Df
±50
5.0
kHz
dB
C
Insertion Loss
Quality Factor
IL
3.1
11,800
3,500
52
2, 5, 6
5, 6, 7
Unloaded Q
Q
U
50 W Loaded Q
Q
L
Temperature Stability
Turnover Temperature
Turnover Frequency
T
f
37
1.0
2.2
67
°C
O
f + 8.4
6, 7, 8
kHz
O
c
2
Frequency Temperature Coefficient
Absolute Value during the First Year
FTC
0.037
ppm/°C
Frequency Aging
|f |
£10
ppm/yr
MW
W
1
5
A
DC Insulation Resistance between Any Two Pins
RF Equivalent RLC Model
Motional Resistance
R
L
43
260.257
1.01245
2.5
78
M
Motional Inductance
µH
5, 7, 9
M
Motional Capacitance
C
fF
M
O
Pin 1 to Pin 2 Static Capacitance
Transducer Static Capacitance
C
5, 6, 9
5, 6, 7, 9
2, 7
2.8
pF
C
2.2
pF
P
Test Fixture Shunt Inductance
L
105
nH
TEST
Lid Symbolization (in Addition to Lot and/or Date Codes)
RFM RO2171
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.
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 calcu-
lated from: f = fO [1 - FTC (TO -TC)2]. Typically, oscillator TO is 20°C less than
the specified resonator TO.
9. This equivalent RLC model approximates resonator performance near the reso-
nant frequency and is provided for reference only. The capacitance CO is the
Aging may exceed the specification for prolonged temperatures above +65°C.
Typically, aging is greatest the first year after manufacture, decreasing signifi-
cantly in subsequent years.
2. The center frequency, fC, is measured at the minimum insertion loss point, ILMIN
,
with the resonator in the 50 W test system (VSWR £ 1.2:1). The shunt induc-
tance, LTEST, is tuned for parallel resonance with CO at fC. Typically, fOSCILLA-
TOR or fTRANSMITTER is less than the resonator fC.
3. One or more of the following United States patents apply: 4,454,488 and
4,616,197 and others pending.
4. Typically, equipment designs utilizing this device require emissions testing and
government approval, which is the responsibility of the equipment manufacturer.
5. Unless noted otherwise, case temperature TC = +25°C±2°C.
6. The design, manufacturing process, and specifications of this device are subject
to change without notice.
static (nonmotional) capacitance between pin1 and pin 2 measured at low fre-
quency (10 MHz) with a capacitance meter. The measurement includes case
parasitic capacitance with a floating case. For usual grounded case applica-
tions (with ground connected to either pin 1 or pin 2 and to the case), add
approximately 0.25 pF to CO.
RF Monolithics, Inc.
RFM Europe
Phone: (972) 233-2903
Phone: 44 1963 251383
Fax: (972) 387-9148
Fax: 44 1963 251510
E-mail: info@rfm.com
http://www.rfm.com
RO2171-031301
Page 1 of 2
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
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