®

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.

RF1284-100705

Electrical Characteristics

Characteristic

Sym

Notes

Minimum

Typical

Maximum

Units

Center Frequency at 25°C

Absolute Frequency

1, 2

319.420

319.580

MHz

Tolerance from 319.500 MHz

∆f

C

±80

kHz

Insertion Loss

IL

1

2.0

3.0

dB

3 dB Bandwidth

1, 2

500

600

800

kHz

Rejection

1

40

50

dB

15

40

Ultimate

80

Temperature

Operating Case Temperature

3, 4

-40

+85

°C

Turnover Temperature

15

25

35

°C

Turnover Frequency

MHz

Frequency Temperature Coefficent

FTC

0.032

Frequency Aging

Absolute Value during the First Year

IfAI

5

≤10

ppm/yr

External Impedance

Series Inductance

L

1

100

nH

Shunt Capacitance

C

1

10

pF

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

RFM // RF1284 // DATECODE

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

•

Complies with Directive 2002/95/EC (RoHS)

The RF1284 is a low-loss, compact and economical surface-acoustic-wave (SAW) filter designed to provide

front-end selectivity in 319.500 MHz receivers.

Recevier designs using this filter include superhet with

10.7 MHz or 500 kHz IF, direct conversion and superregen.

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 (not included). Quartz construction provides excellent frequency stabil-

ity over a wide temperature range.

319.500 MHz

SAW Filter

RF1284

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.

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