RO2136A.PDF

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Preliminary
RO2136A
•
•
•
•
Ideal for 433.92 MHz Superhet Receiver LOs
Very Low Series Resistance
Quartz Stability
Surface-Mount Ceramic Case with 21 mm
2
Footprint
The RO2136A is a true one-port, surface-acoustic-wave (SAW) resonator in a low profile surface-mount
ceramic case. It provides reliable, fundamental-mode, quartz frequency stabilization of local oscillators oper-
ating at approximately 432.920 MHz. This SAW is designed specifically for remote-control and wireless
security receivers operating in Europe under ETSI I-ETS 300 220 and in Germany under FTZ 17 TR 2100.
432.920 MHz
SAW
Resonator
Absolute Maximum Ratings
Rating
CW RF Power Dissipation
DC Voltage Between Terminals
Case Temperature
Soldering Temperature
Value
+10
±30
-40 to +85
+250
Units
dBm
VDC
°C
°C
SM-2 Case
Electrical Characteristics
Characteristic
Center Frequency at +25 °C
Absolute Frequency
Tolerance from 432.920 MHz
Insertion Loss
Quality Factor
Temperature Stability
Unloaded Q
50
Ω
Loaded Q
Turnover Temperature
Turnover Frequency
Frequency Temperature Coefficient
Frequency Aging
RF Equivalent RLC Model
Absolute Value during the First Year
Motional Resistance
Motional Inductance
Motional Capacitance
Transducer Static Capacitance
Test Fixture Inductance
Lid Symbolization
DC Insulation Resistance between Any Two Terminals
R
M
L
M
C
M
C
O
L
TEST
5, 6, 9
2,7
143
1.4
5, 7, 9
Sym
f
C
∆f
C
IL
Q
U
Q
L
T
O
f
O
FTC
|fA|
1
5
1.0
16
92.0548
1.46818
1.7
79
2.0
19
6, 7, 8
2, 5, 6
5, 6, 7
10
1.3
15.650
25
f
c
0.032
≤10
ppm/°C
2
ppm/yr
MΩ
Ω
µH
fF
pF
nH
40
°C
Notes
2, 3, 4, 5
Minimum
432.845
Typical
Maximum
432.995
±75
1.5
Units
MHz
kHz
dB
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
2.
Lifetime (10 year) frequency aging.
The center frequency, f
C
, is measured at the minimum insertion loss point,
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
.
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 gov-
ernment approval, which is the responsibility of the equipment manufacturer.
Unless noted otherwise, case temperature T
C
= +25°C±2°C for all specifica-
tions.
The design, manufacturing process, and specifications of this device are sub-
ject to change without notice.
Derived mathematically from one or more of the following directly measured
parameters: f
C
, IL, 3 dB bandwidth, f
C
versus T
C
, and C
O
.
Turnover temperature, T
O
, is the temperature of maximum (or turnover) fre-
quency, f
O
. The nominal frequency at any case temperature, T
C
, may be cal-
culated from: f = f
O
[1 - FTC (T
O
-T
C
)
2
].
This equivalent RLC model approximates resonator performance near the
resonant 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 parasitic capacitance with “NC” pads unconnected. Case parasitic
capacitance is approximately 0.05pF. Transducer parallel capacitance can be
calculated as: C
P
≈
C
Ο
−
0.05 pF.
9.
3.
4.
5.
6.
7.
8.
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.
E-mail: info@rfm.com
http://www.rfm.com
RO2136A-110299
Page 1 of 2
432.920 MHz
Electrical Connections
The SAW resonator is bidirectional and may be in-
stalled 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 recommend-
ed to help reduce parasitic capacitance in the cir-
cuit.
SAW Resonator
Terminal
Equivalent LC Mode
l
0.05 pF*
NC
NC
Co = Cp + 0.05 pF
Cp
*Case Parasitics
Terminal
Rm
Lm
Cm
Temperature Characteristics
The curve shown on the right
f
C
= f
O
, T
C
= T
O
0
(f-fo ) / fo (ppm)
Typical Test Circuit
The test circuit inductor, L
TEST
, is tuned to resonate with the static capaci-
tance, C
O
, at F
C
.
accounts for resonator contri-
bution only and does not in-
clude LC component tempera-
ture contributions
.
0
-50
-100
-150
-200
0 +20 +40 +60 +80
-50
-100
-150
-200
-80 -60 -40 -20
ELECTRICAL TEST
From 50
Ω
Network Analyzer
To 50
Ω
Network Analyzer
Typical Circuit Board
Land Pattern
∆
T = T
C
- T
O
( °C )
The circuit board land pattern shown below is one possible design. The op-
timum 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 mini-
mize 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 mi-
croinches (min) electroless gold on 50 micorinches (min) electroless nickel.
Typical Application Circuits
Typical Low-Power Transmitter Application
+9VDC
Modulation
Input
200k
Ω
C1
L1
47
(Antenna)
ROXXXXA
Bottom View
470
C2
RF Bypass
Millimeters
Dimensions
Min
A
B
C
D
Output
Inches
Min
Max
0.235
0.155
0.085
0.037
0.033
0.046
0.037
0.017
0.17
0.015
0.043
0.047
0.060
0.043
0.023
0.023
0.209
0.025
0.129
Max
5.97
3.94
2.16
Typical Local Oscillator Application
0.94
0.83
1.16
0.94
0.43
0.43
0.38
1.10
1.20
1.53
1.10
0.59
0.59
5.31
0.64
3.28
E
F
G
H
K
M
N
+VDC
C1
L1
+VDC
ROXXXXA
Bottom View
C2
RF Bypass
P
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.
E-mail: info@rfm.com
http://www.rfm.com
RO2136A-110299
Page 2 of 2

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