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RF1191

更新时间： 2024-11-17 23:32:43
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RF1191 数据手册

 浏览型号RF1191的Datasheet PDF文件第2页 
RF1191  
224.7 MHz SAW Filter  
2
Ideal Front–End Filter for 224.7 MHz Wireless Receivers  
Low–Loss, Coupled–Resonator Quartz Design  
Simple External Impedance Matching  
Rugged TO39 Hermetic Package  
The RF1191 is a low–loss, compact, and economical surface–acoustic–wave (SAW)  
filter designed to provide front–end selectivity in 224.7 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 wireless  
remote–control and security devices operating in France under PTT Specification  
ST/PAA/TPA/AGH/1542.  
TO39–3 Case  
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 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 execellent frequency stablility over a wide temperature range.  
ElectricalCharacteristics  
Characteristic  
Sym  
Notes Minimum  
Typical  
Maximum Units  
Center Frequency at 25_C  
Absolute Frequency  
f
2, 3, 4,  
224.62  
224.78  
MHz  
kHz  
dB  
C
Tolerance from 224.7 MHz  
∆f  
5, 6  
±80  
C
Insertion Loss  
3 dB Bandwidth  
Rejection  
IL  
BW  
2, 4, 7  
2, 3, 4, 7  
2.3  
680  
50  
5.0  
500  
40  
800  
kHz  
3
at f –21.4 MHz (Image)  
c
at f –10.7 MHz (LO)  
2
4, 7, 8  
1
15  
30  
dB  
c
Ultimate  
80  
Temperature  
Operating Case Temperature  
Turnover Temperature  
T
T
–35  
15  
+85  
35  
°C  
°C  
C
25  
O
Turnover Frequency  
f
O
f
C
MHz  
ppm/°C  
2
Frequency Temperaure Coefficient  
Absolute Value during the First Year  
FTC  
|fA|  
0.032  
Frequency Aging  
<±10  
ppm/yr  
External Impedance  
Series Inductance  
Shunt Capacitance  
L
C
2, 7  
2, 7  
12 turns 28 AWG on Toroid  
50  
6
pF  
Lid Symbolization (in addition to Lot and/or Date Codes)  
RFM RF1191  
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.  
Notes:  
1. Frequency aging is the change in f with time and is specified at +65_C or less. Aging may exceed the specification for prolonged temperatures above  
C
+65_C. Typically, aging is greatest the first year after manufacture, decreasing significantly in subsequent years.  
2. Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture, which is connected to a 50Ω test system with  
VSWR £ 1.2:1. The test fixture’s L and C are adjusted for minimum insertion loss at the filter center frequency, f . Note that insertion loss, bandwidth,  
C
and passband shape are dependent on the impedance matching component values and quality. The optimum impedance matching component values  
are dependent on circuit parasitic losses.  
3. The frequency f is defined as the midpoint between the 3dB frequencies.  
C
4. Unless noted otherwise, specifications apply over the entire specified operating temperature range.  
5. One or more of the following United States patents apply: 4,454,488; 4,616,197, and others pending.  
6. All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale.  
7. The design, manufacturing process, and specifications of this device are subject to change without notice.  
8. The turnover temperature, T , is the temperature of maximum (or turnover) frequency, f . The nominal center frequency at any case temperature, TC,  
O
O
may be calculated from: f = f [ 1 – FTC ( T – T )2 ].  
O
O
C
E1996 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc.  
Revision: 4/24/97. Page 1 of 2.  
12

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