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参数资料
| 型号： | RO2179B |
| 厂商： | RF MONOLITHICS INC |
| 元件分类： | SAW谐振器 |
| 英文描述： | 1-PORT SAW RESONATOR, 315 MHz |
| 文件页数： | 1/2页 |
| 文件大小： | 69K |
| 代理商： | RO2179B |
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
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.
RO2179B-111601
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Frequency (+25 °C)
Nominal Frequency
fC
2, 3, 4, 5
314.91
315.00
315.09
MHz
Tolerance from 315.0 MHz
f
C
±100
kHz
Insertion Loss
IL
2, 5, 6
2.2
dB
Quality Factor
Unloaded Q
QU
5, 6, 7
13,087
50
Loaded Q
QL
2,447
Temperature Stability
Turnover Temperature
TO
6, 7, 8
29
°C
Turnover Frequency
fO
fC+16
Frequency Temperature Coefficient
FTC
0.033
ppm/°C2
Frequency Aging
Absolute Value during the First Year
|fA|
1
≤10
ppm/yr
DC Insulation Resistance between Any Two Terminals
5
1.0
M
RF Equivalent RLC Model
Motional Resistance
RM
5, 6, 7, 9
23.1
Motional Inductance
LM
152
H
Motional Capacitance
CM
1.7
fF
Shunt Static Capacitance
CO
5, 6, 7, 9
2.4
pF
Test Fixture Shunt Inductance
LTEST
2, 7
106.6
nH
Lid Symbolization (in Addition to Lot and/or Date Code)
294
SM5248-8 Case
Very Low Series Resistance
Quartz Stability
Surface-Mount, Solder Seal Package with 4.8 x 5.2 mm Footprint
The RO2179B is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount ceramic case.
It provides reliable, fundamental-mode, quartz frequency stabilization.
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation
+0
dBm
DC Voltage Between Terminals (Observe ESD Precautions)
±30
VDC
Case Temperature
-40 to +85
°C
Soldering Temperature
+250
°C
315.0 MHz
SAW
Resonator
RO2179B
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. Aging may exceed the specification for prolonged temperatures
above +65°C. Typically, aging is greatest the first year after manufacture,
decreasing in subsequent years.
2.
The frequency, fC, is measured at the minimum insertion loss point, ILMIN,
with the resonator in the 50
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.
3.
One or more of the following United States patents apply: 4,454,488 and
4,616,197.
4.
Typically, equipment utilizing this device requires emissions testing and
government approval, which is the responsibility of the equipment manu-
facturer.
5.
Unless noted otherwise, case temperature TC = +25°C±5°C.
6.
The design, manufacturing process, and specifications of this device are
subject to change without notice.
7.
Derived mathematically from one or more of the following directly mea-
sured parameters: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
8.
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 T
O is
approximately equal to the specified resonator TO.
9.
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 mea-
sured at low frequency (10 MHz) with a capacitance meter. The measure-
ment includes parasitic capacitance with “NC” pads unconnected. Case
parasitic capacitance is approximately 0.05 pF. Transducer parallel
capacitance can be calculated as: CP ≈ CO - 0.05 pF.
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