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参数资料
| 型号： | RO2125 |
| 厂商： | RF MONOLITHICS INC |
| 元件分类： | SAW谐振器 |
| 英文描述： | 1-PORT SAW RESONATOR, 304.3 MHz |
| 封装： | ROHS COMPLIANT, HERMETIC, CASE TO39-3, 3 PIN |
| 文件页数： | 1/2页 |
| 文件大小： | 136K |
| 代理商： | RO2125 |
www.RFM.com
E-mail: info@rfm.com
Page 1 of 2
2008 by RF Monolithics, Inc.
RO2125 - 3/25/08
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Center Frequency (+25 °C)
Absolute Frequency
fC
2, 3, 4, 5
304.225
304.375
MHz
Tolerance from 304.300 MHz
ΔfC
±75
kHz
Insertion Loss
IL
2, 5, 6
0.9
1.5
dB
Quality Factor
Unloaded Q
QU
5, 6, 7
18,300
50
Ω Loaded Q
QL
2,000
Temperature Stability
Turnover Temperature
TO
6, 7, 8
10
25
40
°C
Turnover Frequency
fO
fc
Frequency Temperature Coefficient
FTC
0.037
ppm/°C2
Frequency Aging
Absolute Value during the First Year
|fA|
1
≤10
ppm/yr
DC Insulation Resistance between Any Two Pins
5
1.0
M
Ω
RF Equivalent RLC Model
Motional Resistance
RM
5, 7, 9
10
19
Ω
Motional Inductance
LM
95.7126
H
Motional Capacitance
CM
2.85803
fF
Pin 1 to Pin 2 Static Capacitance
CO
5, 6, 9
2.9
3.2
3.5
pF
Transducer Static Capacitance
CP
5, 6, 7, 9
2.9
pF
Test Fixture Shunt Inductance
LTEST
2, 7
84
nH
Lid Symbolization (in Addition to Lot and/or Date Code)
RFM RO2125
TO39-3 Case
Ideal for 315 MHz LO in Superhet Receivers with 10.7 MHz IF
Very Low Series Resistance
Quartz Stability
Rugged, Hermetic, Low-Profile TO39 Case
Complies with Directive 2002/95/EC (RoHS)
The RO2125 is a true one-port, surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It
provides reliable, fundamental-mode, quartz frequency stabilization of local oscillators operating at
304.3 MHz. This SAW is designed for 315 MHz superhet receivers with 10.7 MHz IF (Philips UAA3201T).
Applications include automotive-keyless-entry receivers operating in the USA under FCC Part 15, in Canada
under DoC RSS-210, and in Italy.
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation (See: Typical Test Circuit)
+0
dBm
DC Voltage Between Any Two Pins (Observe ESD Precautions)
±30
VDC
Case Temperature
-40 to +85
°C
304.3 MHz
SAW
Resonator
RO2125
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 significantly 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 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.
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 20°C
less than 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 pin1 and pin 2 measured
at low frequency (10 MHz) with a capacitance meter. The measurement
includes case parasitic capacitance with a floating case. For usual
grounded case applications (with ground connected to either pin 1 or pin 2
and to the case), add approximately 0.25 pF to CO.
Pb
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