RO2144A Datasheet, PDF (1/2 Pages) RF Monolithics, Inc – 916.5 MHz SAW Resonator

®
• Ideal for 916.5 MHz FCC Part 15 Transmitters
• Very Low Series Resistance
• Quartz Stability
• Surface-Mount Ceramic Case with 21 mm² Footprint
• Complies with Directive 2002/95/EC (RoHS)
The RO2144A is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount ceramic case.
It provides reliable, fundamental-mode stabilization of fixed-frequency transmitters operating at 916.5 MHz.
This SAW is designed specifically for remote-control and data-link transmitters operating in the USA under
FCC Part 15 regulations.
RO2144A
RO2144A-1
RO2144A-2
916.5 MHz
SAW
Resonator
Absolute Maximum Ratings
Rating
CW RF Power Dissipation (See Typical Test Circuit)
DC Voltage Between Terminals (Observe ESD Precautions)
Case Temperature¹
Soldering Temperature (10 seconds / 5 cycles max.)
Value
+0
±30
-40 to +85
260
Units
dBm
VDC
°C
°C
SM-2 Case
Electrical Characteristics
Characteristic
Frequency (+25 °C) Nominal Frequency
RO2144A
RO2144A-1
RO2144A-2
Tolerance from 916.5 MHz
RO2144A
RO2144A-1
RO2144A-2
Insertion Loss
Quality Factor
Unloaded Q
50 Ω Loaded Q
Temperature Stability
Turnover Temperature
Turnover Frequency
Frequency Temperature Coefficient
Frequency Aging
Absolute Value during the First Year
DC Insulation Resistance between Any Two Terminals
RF Equivalent RLC Model Motional Resistance
Motional Inductance
Motional Capacitance
Transducer Static Capacitance
Test Fixture Shunt Inductance
Lid Symbolization
Sym
f_C
∆f_C
IL
Q_U
Q_L
T_O
f_O
FTC
|fA|
R_M
L_M
C_M
C_P
L_TEST
Notes
2, 3, 4, 5
2, 5, 6
5, 6, 7
6, 7, 8
1
5
5, 6, 7, 9
5, 6, 9
2, 7
Minimum
916.405
916.300
916.350
Typical
23,509
4,000
10
25
916.7
0.032
1.0
20.5036
83.704
0.3603
2.2
13.7
158
Maximum
916.595
916.700
916.650
±95
±200
±150
2.5
Units
MHz
kHz
dB
40
°C
MHz
ppm/°C²
50
ppm
MΩ
Ω
µH
fF
pF
nH
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Frequency aging is the change in f_C with time and is specified at +65°C or less.
to change without notice.
Aging may exceed the specification for prolonged temperatures above +65°C.
7. Derived mathematically from one or more of the following directly measured
Typically, aging is greatest the first year after manufacture, decreasing in subse-
parameters: f_C, IL, 3 dB bandwidth, f_C versus T_C, and C_O.
quent years.
8. Turnover temperature, T_O, is the temperature of maximum (or turnover) fre-
2. The center frequency, f_C, is measured at the minimum insertion loss point,
quency, f_O. The nominal frequency at any case temperature, T_C, may be calcu-
IL_MIN, with the resonator in the 50 Ω test system (VSWR ≤ 1.2:1). The shunt
inductance, L_TEST, is tuned for parallel resonance with C_O at f_C. Typically, f_OS-
CILLATOR ^{or f}TRANSMITTER ^{is approximately equal to the resonator f}C^.
lated from: f = f_O [1 - FTC (T_O -T_C)²]. Typically oscillator T_O is approximately
equal to the specified resonator T_O.
9. This equivalent RLC model approximates resonator performance near the reso-
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 govern-
ment approval, which is the responsibility of the equipment manufacturer.
5. Unless noted otherwise, case temperature T_C = +25°C±2°C.
nant frequency and is provided for reference only. The capacitance C_O 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 by calculated as:
6. The design, manufacturing process, and specifications of this device are subject
C_P ≈ C_O - 0.05 pF.
RF Monolithics, Inc. Phone: [phone]
Fax: [phone]
RFM Europe
Phone: [phone]
Fax: [phone]
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: [e-mail]
Page 1 of 2
http://www.rfm.com
RO2144A_RO2144A-1_RO2144A-2_071101