®

RF Monolithics, Inc.

Phone: (972) 233-2903

Fax: (972) 387-8148

E-mail: info@rfm.com

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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.

RF1172-102401

TO39-3 Case

•

Ideal Front-End Filter for European Wireless Receivers

•

Low-Loss, Coupled-Resonator Quartz Design

•

Simple External Impedance Matching

•

Rugged TO39 Hermetic Package

The RF1172 is a low-loss, compact and economical surface-acoustic-wave (SAW) filter designed to provide

front-end selectivity in 433.92 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

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.

433.92 MHz

SAW Filter

RF1172

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

and passband shape are dependent on the impedance matching component values and quality.

3. Where noted, specifications apply over the entire specified operating temperature range.

5. 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.

6. The design, manufacturing process, and specifications of this device are subject to change without notice.

7. One or more of the following U.S. Patents apply: 4,54,488, 4,616,197, and others pending.

8. All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale.

Electrical Characteristics

Characteristic

Sym

Notes

Minimum

Typical

Maximum

Units

Center Frequency at 25°C

Absolute Frequency

1, 2

433.92

MHz

Tolerance from 433.92 MHz

∆f

C

±80

kHz

Insertion Loss

IL

1

3.0

5.0

dB

3 dB Bandwidth

1, 2

500

600

800

kHz

Rejection

1

40

50

dB

15

30

Ultimate

80

Temperature

Operating Case Temp.

3, 4

-40

+85

°C

Turnover Temperature

15

25

35

°C

Turnover Frequency

MHz

Freq. Temp. Coefficient

FTC

0.032

Frequency Aging

Absolute Value during the First Year

|fA|

5

≤10

ppm/yr

External Impedance

Series Inductance

L

1

47

nH

Shunt Capacitance

C

11

pF

Lid Symbolization (in addition to Lot and/or Date Codes)

RFM RF1172