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参数资料
| 型号： | RO2123A |
| 厂商： | RF MONOLITHICS INC |
| 元件分类： | SAW谐振器 |
| 英文描述： | 1-PORT SAW RESONATOR, 307.3 MHz |
| 封装： | ROHS COMPLIANT, CERAMIC, CASE SM-2, 4 PIN |
| 文件页数： | 1/2页 |
| 文件大小： | 115K |
| 代理商： | RO2123A |
www.RFM.com
E-mail: info@rfm.com
Page 1 of 2
2008 by RF Monolithics, Inc.
RO2123A - 3/25/08
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Frequency (+25 °C)
Nominal Frequency
fC
2, 3, 4, 5
307.200
307.400
MHz
Tolerance from 307.300 MHz
ΔfC
±100
kHz
Insertion Loss
IL
2, 5, 6
0.8
1.5
dB
Quality Factor
Unloaded Q
QU
5, 6, 7
17,000
50
Ω Loaded Q
QL
1,400
Temperature Stability
Turnover Temperature
TO
6, 7, 8
10
25
40
°C
Turnover Frequency
fO
fC
Frequency Temperature Coefficient
FTC
0.032
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
Ω
RF Equivalent RLC Model
Motional Resistance
RM
5, 7, 6, 9
10
19
Ω
Motional Inductance
LM
78.6444
H
Motional Capacitance
CM
3.41073
fF
Transducer Static Capacitance
CO
5, 6, 9
3.1
3.4
3.7
pF
Test Fixture Shunt Inductance
LTEST
2, 7
79
nH
Lid Symbolization
117
Ideal for 318 MHz Superhet Receiver LOs
Very Low Series Resistance
Quartz Stability
Surface-Mount, Ceramic Case with 21 mm2 Footprint
Complies with Directive 2002/95/EC (RoHS)
The RO2123A 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 307.3 MHz. This SAW is designed for 318 MHz superhet receivers with 10.7 MHz IF.
Applications include remote-control and wireless security receivers operating in the USA under FCC Part 15,
in Canada under DoC RSS-210, and in Australia.
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation (See Typical Test Circuit)
+0
dBm
DC Voltage Between Terminals (Observe ESD Precautions)
±30
VDC
Case Temperature
-40 to +85
°C
Soldering Temperature (10 seconds / 5 cycles max.)
260
°C
307.3 MHz
SAW
Resonator
RO2123A
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 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.
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
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.
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)
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
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 -0.05pF.
SM-2 Case
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