®
RF1210B
303.825 MHz
SAW Filter
•
•
•
•
•
Ideal Front-End Filter for European Wireless Receivers
Low-Loss, Coupled-Resonator Quartz Design
Simple External Impedance Matching
Surface-Mount Ceramic Case with 52 mm
2
Footprint
Complies with Directive 2002/95/EC (RoHS)
The RF1210B is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to pro-
vide front-end selectivity in 303.825 MHz receivers. Receiver designs using this filter include superhet with
10.7 MHz or 500 kHz IF, direct conversion and superregen. Typical applications of these receivers are wire-
less remote-control and security devices operating in the USA under FCC Part 15, Australia, Japan and
Korea.
This coupled-resonator filter (CRF) uses selective null placement to provide suppression, typically greater
than 40 dB, of the LO and image spurious responses of superhet receivers with 10.7 MHz IF. RFM’s ad-
vanced SAW design and fabrication technology is utilized to achieve high performance and very low loss with
simple external impedance matching (not included). Quartz construction provides excellent frequency stability
over a wide temperature range. Our new patent pending solder seal process utilizes a Faraday shield lid,
which improves out of band rejection.
SM8558-8 Case
Electrical Characteristics
Characteristic
Center Frequency at 25°C
Insertion Loss
3 dB Bandwidth
Rejection
at f
c
- 21.4 MHz (Image)
at f
c
- 10.7 MHz (LO)
Ultimate
Temperature
Operating Case Temp.
Turnover Temperature
Turnover Frequency
Freq. Temp. Coefficient
Frequency Aging
External Impedance
Absolute Value during the First Year
Series Inductance
Shunt Capacitance
Lid Symbolization (in addition to Lot and/or Date Codes)
T
C
T
O
f
O
FTC
|fA|
L
C
5
1
3, 4
-35
22
37
f
c
0.032
≤10
82
9
RFM RF1210B
1
Absolute Frequency
Tolerance from 303.825 MHz
Sym
f
c
∆f
c
IL
BW
3
Notes
1, 2
1
1, 2
500
40
15
1.7
700
50
40
80
+85
52
°C
MHz
ppm/°C
2
ppm/yr
nH
pF
dB
Minimum
303.745
Typical
Maximum
303.905
±80
3.0
800
Units
MHz
kHz
dB
kHz
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture which is connected to a 50
Ω
test system with
VSWR
≤
1.2:1. The test fixture L and C are adjusted for minimum insertion loss at the filter center frequency, f
c
. Note that insertion loss and band-
width are dependent on the impedance matching component values and quality.
2. The frequency f
c
is defined as the midpoint between the 3dB frequencies.
3. Unless noted otherwise, specifications apply over the entire specified operating temperature range.
4. The turnover temperature, T
O
, is the temperature of maximum (or turnover) frequency, f
o
. The nominal frequency at any case temperature, T
c
, may
5.
6.
7.
8.
be calculated from: f = f
o
[1 - FTC (T
o
- T
c
)
2
].
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.
The design, manufacturing process, and specifications of this device are subject to change without notice.
One or more of the following U.S. Patents apply: 4,54,488, 4,616,197, and others pending.
All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale.
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
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
RF1210B-083101
Page 1 of 2
303.825 MHz
Absolute Maximum Ratings
Rating
Incident RF Power
DC Voltage between any 2 pins (Observe ESD Precautions)
Case Temperature
5
Soldering Temperature
SAW Filter
Value
+13
±30
-40 to +85
(10 seconds / 5 cycles max.)
260
Units
dBm
VDC
°C
°C
Electrical Connections
Pin
1
2
3
4
5
6
7
8
Connection
Input
Ground
Output Return
Case Ground
Output
Ground
Input Return
Case Ground
Case Design
Dimensions
A
Millimeters
Min
Max
8.71
6.04
2.03
0.79 Nominal
1.14 Nominal
1.98 Nominal
0.79 Nominal
6.91
4.24
0.81
2.54 Nominal
1.91 Nominal
Min
Inches
Max
0.343
0.238
0.080
0.031 Nominal
0.045 Nominal
0.078 Nominal
0.031 Nominal
0.040
0.167
0.032
0.100 Nominal
0.075 Nominal
Typical Test Circuit
B
C
D
E
F
G
H
K
M
N
P
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
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
RF1210-083101
Page 2 of 2
