RO2180B [ETC]
Analog IC ; 模拟IC\n
ETC 
RO2180B
•
•
•
Very Low Series Resistance
Quartz Stability
Surface-Mount, Solder Seal Package with 4.8 x 5.2 mm Footprint
433.92 MHz
SAW
The RO2180B is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount ceramic case.
It provides reliable, fundamental-mode, quartz frequency stabilization.
Resonator
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation
+0
dBm
DC Voltage Between Terminals (Observe ESD Precautions)
Case Temperature
±30
-40 to +85
+250
VDC
°C
SM5248-8 Case
Soldering Temperature
°C
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
433.995
±75
Units
MHz
kHz
dB
f
Frequency (+25 °C)
Nominal Frequency
433.845
433.92
C
2, 3, 4, 5
Df
Tolerance from 433.92 MHz
C
Insertion Loss
Quality Factor
IL
2, 5, 6
5, 6, 7
2
Q
Unloaded Q
11,535
1,811
25
U
Q
T
50 W Loaded Q
L
Temperature Stability
Turnover Temperature
Turnover Frequency
°C
O
f
f
16
6, 7, 8
O
C+
2
Frequency Temperature Coefficient
Absolute Value during the First Year
FTC
|fA|
0.032
ppm/°C
Frequency Aging
1
5
£10
ppm/yr
MW
W
DC Insulation Resistance between Any Two Terminals
1.0
R
RF Equivalent RLC Model
Motional Resistance
Motional Inductance
Motional Capacitance
Shunt Static Capacitance
18.63
78.79
1.71
M
L
5, 6, 7, 9
µH
M
C
fF
M
C
5, 6, 7, 9
2, 7
1.82
pF
O
L
Test Fixture Shunt Inductance
63.13
nH
TEST
Lid Symbolization (in Addition to Lot and/or Date Code)
295
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
2.
Frequency aging is the change in fC with time and is specified at +65°C or less.
7.
8.
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) fre-
Aging may exceed the specification for prolonged temperatures above +65°C.
Typically, aging is greatest the first year after manufacture, decreasing in subse-
quent years.
The 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 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 govern-
ment approval, which is the responsibility of the equipment manufacturer.
Unless noted otherwise, case temperature TC = +25°C±5°C.
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 approximately
equal to the specified resonator TO.
This equivalent RLC model approximates resonator performance near the reso-
nant 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 para-
sitic capacitance with “NC” pads unconnected. Case parasitic capacitance is
approximately 0.05 pF. Transducer parallel capacitance can be calculated as:
9.
3.
4.
5.
6.
C
P » CO - 0.05 pF.
The design, manufacturing process, and specifications of this device are subject
to change without notice.
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
RO2180B-031000
Page 1 of 2
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
433.92 MHz
SAW Resonator
Electrical Connections
This one-port, eight-terminal solder seal resonator is bidirectional. Howev-
er, impedances and circuit board parasitics may not be symmetrical, requir-
ing slightly different oscillator component-matching values.
Pin
1
Connection
Ground
2
Input or Output
Ground
3
4
Ground
Case Design
5
Ground
TOP VIEW
BOTTOM VIEW
6
Output or Input
Ground
B
J
D
E
5
6
7
7
H
8
Ground
I
4
8
A
Typical Circuit
45°
Input or Output
3
2
1
F
G
C
6
2
7
1
5
3
Nominal
4
8
Dimensions
Millimeters
5.18
Inches
.204
.189
.020
.045
.050
.028
.044
.054
.102
0.070
A
B
C
D
E
F
G
H
I
4.8
0.508
1.14
1.27
0.71
Input or Output
1.12
1, 3, 4, 5, 7, 8 No Internal Connection
1.37
2.59
J
1.78
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
RO2180B-031000
Page 2 of 2
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
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