RF3210
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Ideal Front-End Filter for 303.825 MHz Wireless Receivers
Low-Loss, Coupled-Resonator Quartz Design
Simple External Impedance Matching
Rugged TO39 Hermetic Package
Pb
Complies with Directive 2002/95/EC (RoHS)
303.825 MHz
SAW Filter
The RF3210 is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed
to provide front-end selectivity in 303.825 MHz receivers. Receiver designs using this filter include
superheterodynes with 10.7 MHz or 500 kHz IF’s, direct conversions and superregeneratives.
This coupled-resonator filter (CRF) uses selective null placement to provide suppression, typically
greater than 40 dB, of the LO and image responses of superhet receivers with 10.7 MHz IF’s.
RFM’s advanced 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.
TO39-3 Case
Electrical Characteristics
Characteristic
Center Frequency at 25°C
Center Frequency Tolerance from 303.825 MHz
Insertion Loss
3 dB Passband
Rejection
at f
c
- 21.4 MHz (Image)
at f
c
- 10.7 MHz (LO)
Ultimate
Temperature
Operating Case Temp.
Turnover Temperature
Freq. Temp. Coefficient
Frequency Aging
Impedance @ f
C
Absolute Value during the First Year
Input: Z
IN
= R
IN
|| C
IN
Output: Z
OUT
= R
OUT
|| C
OUT
T
C
T
O
FTC
|fA|
Z
IN
Z
OUT
5
1
3, 4
-40
10
25
0.032
≤10
80.3
Ω
|| 8.34 pF
91.4
Ω
|| 9.15 pF
RFM RF3210
1
Sym
f
C
∆f
C
IL
BW
3
Notes
1, 2
1
1, 2
Minimum
303.745
Typical
Maximum
303.905
±80
Units
MHz
kHz
dB
kHz
dB
1.7
500
40
15
700
50
35
60
3.0
800
+85
40
°C
ppm/°C
2
ppm/yr
Lid Symbolization (in addition to Lot and/or Date Codes)
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, bandwidth,
and passband shape are dependent on the impedance matching component values and quality.
The frequency f
c
is defined as the midpoint between the 3dB frequencies.
Unless noted otherwise, specifications apply over the entire specified operating temperature range.
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
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.
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www.RFM.com E-mail: info@rfm.com
©2009 by RF Monolithics, Inc.
Page 1 of 2
RF3210 - 6/19/09
RFM [ RF MONOLITHICS, INC ]
