®
RF1391C
Pb
•
•
•
•
Ideal Front-End Filter for Wireless Receivers
Low-Loss, Coupled-Resonator Quartz Design
Simple External Impedance Matching
Complies with Directive 2002/95/EC (RoHS)
The RF1391C is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to pro-
vide front-end selectivity in 433.42 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 Europe under ETSI I-ETS 300 220.
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.
433.42 MHz
SAW Filter
SM5050-8 Case
5x5
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
Impedance @ fc
Absolute Value during the First Year
Input Z
IN
= R
IN
//C
IN
Output Z
OUT
= R
OUT
//C
OUT
Lid Symbolization (Y=year WW=week S=Shift)
Standard Reel Quantity
Standard Reel Quantity
7 Inch Reel
13 Inch Reel
T
C
T
O
f
O
FTC
|fA|
Z
IN
Z
OUT
5
1
3, 4
-40
15
25
f
c
0.032
≤10
212
Ω
// 3.1 pF
212
Ω
// 3.1 pF
415 YWWS
500 pieces/reel
3000 pieces/reel
1
Absolute Frequency
Tolerance from 433.42 MHz
Sym
f
c
∆f
C
IL
BW
3
Notes
1, 2
1
1, 2
500
40
30
Minimum
Typical
433.42
-120/+200
3.0
600
50
40
80
+85
35
°C
°C
MHz
ppm/°C
2
ppm/yr
dB
5.0
750
Maximum
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 and passband shape 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. Where noted 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
RF1391C-040103
Page 1 of 2
433.42 MHz
Absolute Maximum Ratings
Rating
Input Power Level
DC Voltage
Storage Temperature
Soldering Temperature
SAW Filter
Value
10
12
-40 to +85
(10 seconds / 5 cycles max.)
260
Units
dBm
VDC
°C
°C
Typical Filter Response
Typical filter responses are shown below. The actual response is dependent on external impedance matching and circuit layout.
CH1
S21
LOG
5 dB / REF -20 dB
1:-3.9167 dB
433.420 000 MHz
CH1
S21
LOG
8 dB / REF -30 dB
1:-3.9433 dB
433.500 000 MHz
PRm
1
PRm
1
Max
Cor
Cor
5 dB/div
Min 3dB
Passband
at 25°C
8 dB/div
Lo
Image
START 432.500 000 MHz
200 kHz/div
STOP 434.500 000 MHz
START 409.5 MHz
5 Mhz/div
STOP 459.5 MHz
Electrical Connections
Pin
1
2
3
4
5
6
7
8
Connection
Input Ground
Input
to be Grounded
Case Ground
Output
Output Ground
to be Grounded
Case Ground
A
2
3
1
B
8
C
E
8
D 7
6
5
7
6
5
1
2
3
G
4
4
F
Matching Circuit to 50Ω
Ω
Case Dimensions
Dimension
7
6
L=33 nH
1
L=33 nH
8
4
2
C=4.3 pF
Input
Output
C=4.3 pF
5
3
A
B
C
D
E
F
G
Min
4.8
4.8
mm
Nom
5.0
5.0
2.08
1.17
0.64
2.54
Max
5.2
5.2
1.7
Min
0.189
0.189
Inches
Nom
0.197
0.197
0.082
0.046
0.025
0.100
Max
0.205
0.205
0.067
2.39
2.69
0.094
0.106
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
RF1391C-040103
Page 2 of 2
