RO2175A [MURATA]
1-Port Saw Resonator, 430.5MHz Nom;
| 型号： | RO2175A |
| 厂家： | 
muRata |
| 描述： | 1-Port Saw Resonator, 430.5MHz Nom 晶体 谐振器 |
| 文件： | 总2页 (文件大小：172K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Preliminary
RO2175A
•
•
•
•
Ideal for Chinese 431 MHz Superhet Receiver LO’s
Very Low Series Resistance
Quartz Stability
Surface-Mount, Ceramic Case with 21 mm2 Footprint
430.5 MHz
SAW
Resonator
The RO2175A is a 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 approxi-
mately 430.5 MHz. This SAWR is designed for 431 MHz superhet receivers with 500kHz IF (Philips
UAA320IT). Applications include remote-control and wireless security receivers operating in China.
Absolute Maximum Ratings
Rating
Value
+0
Units
dBm
VDC
°C
CW RF Power Dissipation
DC Voltage Between Terminals (Observe ESD Precautions)
Case Temperature
±30
-40 to +85
+250
SM-2 Case
Soldering Temperature
°C
Electrical Characteristics
Characteristic
Sym
Notes
2, 3, 4, 5
2, 5, 6
Minimum
Typical
Maximum
430.575
±75
Units
f
Frequency (+25 °C)
Absolute Frequency
430.425
MHz
kHz
dB
C
Df
Tolerance from 430.5 MHz
C
Insertion Loss
Quality Factor
IL
1.0
13,600
1,700
30
1.5
Q
Unloaded Q
U
5, 6, 7
Q
T
50 W Loaded Q
L
Temperature Stability
Turnover Temperature
Turnover Frequency
15
1.0
2.2
45
°C
O
f
f
6, 7, 8
O
C
2
Frequency Temperature Coefficient
Absolute Value during the First Year
FTC
|fA|
0.032
ppm/°C
Frequency Aging
1
5
£10
ppm/yr
MW
W
DC Insulation Resistance between Any Two Terminals
R
RF Equivalent RLC Model
Motional Resistance
Motional Inductance
Motional Capacitance
Shunt Static Capacitance
14
72.0
1.9
19
M
L
5, 6, 7, 9
µH
M
C
fF
M
C
5, 6, 7, 9
2, 7
2.5
2.8
pF
O
L
Test Fixture Shunt Inductance
54.77
nH
TEST
Lid Symbolization (in Addition to Lot and/or Date Code)
289
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
2.
Frequency aging is the change in fC with time and is specified at +65°C or less.
8.
Turnover temperature, TO, is the temperature of maximum (or turnover) fre-
quency, fO. The nominal frequency at any case temperature, TC, may be calcu-
lated from: f = fO [1 - FTC (TO -TC)2]. Typically oscillator TO is approximately
equal to the specified resonator TO.
This equivalent RLC model approximates resonator performance near the reso-
nant 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 para-
sitic capacitance with "NC” pads unconnected. Case parasitic capacitance is
approximately 0.05 pF. Transducer parallel capacitance can by calculated as:
Aging may exceed the specification for prolonged temperatures above +65°C.
Typically, aging is greatest the first year after manufacture, decreasing in subse-
quent years.
The center frequency, fC, is measured at the minimum insertion loss point,
9.
ILMIN, with the resonator in the 50 W test system (VSWR £ 1.2:1). The shunt
inductance, LTEST, is tuned for parallel resonance with CO at fC. Typically, fOS-
CILLATOR or fTRANSMITTER is approximately equal to the resonator 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 govern-
ment 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.
3.
4.
C
P » CO - 0.05 pF.
5.
6.
7.
Derived mathematically from one or more of the following directly measured
parameters: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
RF Monolithics, Inc.
RFM Europe
Phone: (972) 233-2903
Phone: 44 1963 251383
Fax: (972) 387-9148
Fax: 44 1963 251510
E-mail: info@rfm.com
http://www.rfm.com
RO2175A-110399
Page 1 of 2
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
430.5 MHz
SAW Resonator
Electrical Connections
Equivalent LC Model
Terminal
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.
0.05 pF*
NC
NC
+
C
=
C
o
0.05 pF
p
C
p
*Case Parasitics
Terminal
Lm
Cm
Rm
Temperature Characteristics
The curve shown on the right
fC = fO , T C = TO
0
0
Typical Test Circuit
accounts for resonator contri-
-50
bution only and does not in-
-100
-50
The test circuit inductor, L
, is tuned to resonate with the static capaci-
TEST
-100
-150
-200
tance, C , at F .
O
C
clude LC component tempera-
-150
ture contributions.
-200
-80 -60 -40 -20
0
+20 +40 +60 +80
ELECTRICAL TEST
Typical Circuit Board
Land Pattern
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.
T = TC - TO ( °C )
D
W
W
From 50
To 50
Network Analyzer
Network Analyzer
(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
47
200k
W
Modulation
Input
C1
L1
(Antenna)
C2
ROXXXXA
Bottom View
Millimeters
Inches
RF Bypass
Dimensions
Min
Max
Min
Max
470
A
B
C
D
E
F
5.97
3.94
2.16
1.10
1.20
1.53
1.10
0.59
0.59
5.31
0.64
3.28
0.235
0.155
0.085
0.043
0.047
0.060
0.043
0.023
0.023
0.209
0.025
0.129
Typical Local Oscillator Application
0.94
0.83
1.16
0.94
0.43
0.43
0.037
0.033
0.046
0.037
0.017
0.17
Output
+VDC
+VDC
C1
G
H
K
M
N
P
L1
C2
ROXXXXA
0.38
0.015
Bottom View
RF Bypass
RF Monolithics, Inc.
RFM Europe
Phone: (972) 233-2903
Phone: 44 1963 251383
Fax: (972) 387-9148
Fax: 44 1963 251510
E-mail: info@rfm.com
http://www.rfm.com
RO2175A-110399
Page 2 of 2
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
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