RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 E-mail: info@rfm.com Page 1 of 2
RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 http://www.rfm.com
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. RF1327-1-090600
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Nominal Frequency fC2, 4, 5, 6 927.578 927.778 927.978 MHz
Insertion Loss IL 3, 4, 7 5.0 dB
3 dB Passband BW32, 3, 4, 7 kHz
3 dB Reject Band BW32, 3, 4, 7 ±80 kHz
Rejection at fC - 21.4 MHz (Image)
4
40 50
dB
at fC - 10.7 MHz (LO) 15 30
Ultimate 80
Temperature Operating Case Temperature TC
3, 7, 8
-40 +85 °C
Turnover Temperature TO15 25 40 °C
Turnover Frequency fOfCMHz
Frequency Temperature Coefficient FTC 0.032 ppm/°C2
Frequency Aging Absolute Value during the First Year IfAI 3 10 ppm/yr
External Impedance Series Inductance L1, 7 10 nH
Shunt Capacitance C3.3-3.9 pF
Lid Symbolization (in addition to Lot and/or Date Codes) RFM RF1327-1
TO39-3 Case
•Ideal Front-End Filter Wireless Receivers
•Low-Loss, Coupled-Resonator Quartz Design
•Simple External Impedance Matching
•Rugged TO39 Hermetic Package
The RF1327-1 is a low-loss, compact and economical surface-acoustic-wave (SAW) filter designed to pro-
vide front-end selectivity receivers. Receiver designs using this filter include superhet with 10.7MHz, direct
conversion and superregen. Typical applications of these FSK receivers are wireless remote-control and
security devices.
This coupled-resonator filter (CRF) uses selective null placement to provide suppression, typically greater
than 40dB. 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 ex-
cellent frequency stability over a wide temperature range.
927.778 MHz
SAW Filter
RF1327-1
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Typical test circuit is shown for TO-39 RF filters.
2. Passband and reject bands are specified in reference to fC.
3. All characteristics are specified over the operating temperature range and typical aging for 10 years.
4. Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture. Note that insertion loss, bandwidth, and pass-
band shape are dependent on the impedance matching component values and quality. Demonstration circuits are available for confirmation of device
performance.
5. One or more of the following U.S. Patents apply: 4,454,488; 4,616,197; and other 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, TO, is the temperature of maximum (or turnover) frequency, fo. The nominal frequency at any case temperature, TC, out-
side the operating temperature range may be calculated from: f=fo[1-FTC (TO-TC)2].
927.778 MHz SAW Filter
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 E-mail: info@rfm.com Page 2 of 2
RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 http://www.rfm.com
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. RF1327-1-090600
Absolute Maximum Ratings
Typical Filter Response
Typical filter responses are shown below. Illustrated frequencies and mini-
mum rejection for LO and IMAGE are shown only for superhet receivers
with 10.7 MHz IF.
Electrical Connections
Typical Test Circuit
Case Design
Rating Value Units
Incident RF Power +13 dBm
DC Voltage Between Any Two Pins (Observe ESD Precautions) ±30 VDC
Case Temperature -40 to +85 °C
LO
0
-10
-20
-30
-40
-50
-60
-70
-80 5 MHz/div
Frequency
Image
Amplitude Response
Bottom View
Pin 1
Pin 2
Pin 3
Pin Connection
1Input or Output
2Output or Input
3Case Ground
L
C C
L
2
3
1
From 50
Network
Analyzer
Ω
To 50
Ω
Network
Analyzer
Dimensions Millimeters Inches
Min Max Min Max
A9.30 0.366
B3.18 0.125
C2.50 3.50 0.098 0.138
D0.46 Nominal 0.018 Nominal
E5.08 Nominal 0.200 Nominal
F2.54 Nominal 0.100 Nominal
G2.54 Nominal 0.100 Nominal
H1.02 0.040
J1.40 0.055
0
dB
-1
-2
-3
-4
-5
-6
-7
-8 150 KHz/div
Amplitude Response
Min 3dB
Passband
at 25 C
o
B
45°
J
(2 places)
D
(3 places)
H
G
EF
C
A