ETC RO2102A-1

RO2102A-1
•
•
•
Ideal for 423.22 MHz LOs in Superhet Receivers
Low Series Resistance
Quartz Stability
•
Surface-Mount, Ceramic Case with 21 mm2 Footprint
423.22 MHz
SAW
Resonator
The RO2102a-1 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 fixed-frequency oscillators operating
at 423.22 MHz. The RO2102A-1 is designed specifically for the LO of 433.92 MHz superhet receivers in remote-control and wireless security applications operating under ETSI I-ETS 300 220 in Europe.
Absolute Maximum Ratings
Rating
Value
Units
+10
dBm
±30
VDC
CW RF Power Dissipation
DC Voltage Between Terminals (Observe ESD Precautions)
Case Temperature1
-40 to +85
°C
Value
Units
Rating
SM-2 Case
Electrical Characteristics
Characteristic
Center Frequency at +25 °C
Absolute Frequency
Sym
fC
Tolerance from 423.22 MHz
∆fC
2, 3, 4, 5
IL
2, 5, 6
Unloaded Q
QU
50 Ω Loaded Q
QL
Turnover Temperature
TO
Insertion Loss
Quality Factor
Temperature Stability
Turnover Frequency
Frequency Aging
Notes
FTC
Absolute Value during the First Year
|fA|
Test Fixture Shunt Inductance
1.1
RM
Motional Inductance
LM
Motional Capacitance
CM
Transducer Static Capacitance
CO
5, 6, 9
LTEST
2, 7
±50
kHz
2.0
dB
40
°C
fC
kHz
0.032
ppm/°C2
ppm/yr
≤10
1
Motional Resistance
Units
MHz
25
6, 7, 8
5
Maximum
1,950
10
DC Insulation Resistance between Any Two Terminals
RF Equivalent RLC Model
Typical
423.22
16,350
5, 6, 7
fO
Frequency Temperature Coefficient
Minimum
1.0
MΩ
13.5
5, 7, 9
Lid Symbolization
83.0050
26
Ω
µH
1.703730
fF
1.7
pF
77.62
nH
146
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
otes:
1.
2.
3.
4.
5.
6.
7.
8.
Lifetime (10 year frequency aging.
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.
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 government approval, which is the responsibility of the equipment manufacturer.
Unless noted otherwise, case temperature TC = +25°C±2°C.
The design, manufacturing process, and specifications of this device are subject to change without notice.
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) frequency, fO. The nominal frequency at any case temperature, TC, may be cal-
9.
10.
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
culated from: f = fO [1 - FTC (TO -TC)2].
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 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.
Packaged in 500PC Tape carrier.
E-mail: [email protected]
http://www.rfm.com
RO2102A-1-061901
Page 1 of 2
423.22 MHz
SAW Resonator
Equivalent LC Model
Electrical Connections
The SAW resonator is bidirectional and may be installed with either orientation. The two terminals
are interchangeable and unnumbered. The callout
NC indicates no internal connection. The NC pads
assist with mechanical positioning and stability.
External grounding of the NC pads is recommended to help reduce parasitic capacitance in the circuit.
Terminal
0.05 pF*
Co = Cp + 0.05 pF
NC
NC
Cp
*Case Parasitics
Terminal
Rm
Lm
Cm
Temperature Characteristics
The curve shown on the right
accounts for resonator contri-
The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC.
bution only and does not include LC component temperature contributions.
ELECTRICAL TEST
Network Analyzer
0
-50
-50
-100
-100
-150
-150
-200
-80 -60 -40 -20
Typical Circuit Board
Land Pattern
To 50 Ω
From 50 Ω
Network Analyzer
fC = f O , T C = T O
0
(f-fo ) / fo (ppm)
Typical Test Circuit
-200
0 +20 +40 +60 +80
∆T = T C - T O ( °C )
The circuit board land pattern shown below is one possible design. The optimum land pattern is dependent on the circuit board assembly process
which varies by manufacturer. The distance between adjacent land edges
should be at a maximum to minimize parasitic capacitance. Trace lengths
from terminal lands to other components should be short and wide to minimize parasitic series inductances.
(4 Places)
Typical Dimension:
0.010 to 0.047 inch
(0.25 to 1.20 mm)
Case Design
The case material is black alumina with contrasting symbolization. All pads
are nominally centered with respect to the base and consist of 60 to 100 microinches (min) electroless gold on 50 micorinches (min) electroless nickel.
Typical Application Circuits
Typical Low-Power Transmitter Application
+9VDC
Modulation
Input
200k Ω
47
C1
L1
(Antenna)
C2
ROXXXXA
Bottom View
Millimeters
RF Bypass
Min
470
Typical Local Oscillator Application
Output
+VDC
C1
ROXXXXA
Bottom View
Inches
Dimensions
+VDC
L1
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
Max
0.235
B
3.94
0.155
C
2.16
0.085
D
0.94
1.10
0.037
0.043
E
0.83
1.20
0.033
0.047
F
1.16
1.53
0.046
0.060
G
0.94
1.10
0.037
0.043
H
0.43
0.59
0.017
0.023
K
0.43
0.59
0.017
0.023
N
RF Bypass
Min
5.97
M
C2
Max
A
P
5.31
0.38
0.64
0.209
0.015
3.28
E-mail: [email protected]
http://www.rfm.com
RO2102A-1-061901
0.025
0.129
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