RF3181【PDF 1/2 页】SAW FILTER 916.50MHZ TO39-3

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RF3181

Ideal Front-End Filter for 916.5 MHz Wireless Receivers

Low-Loss, Coupled-Resonator Quartz Design

Simple External Impedance Matching

Rugged TO39 Hermetic Package

Complies with Directive 2002/95/EC (RoHS)

916.50 MHz

SAW Filter

The RF3181 is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to provide

front-end selectivity in 916.5 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 the USA under FCC Part 15 and in Canada under DoC RSS-210.

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.

TO39-3 Case

Electrical Characteristics

Characteristic

Center Frequency at 25°C Absolute Frequency

Tolerance from 916.500 MHz

Insertion Loss

3 dB Bandwidth

Sym

f C

? f C

BW 3

Notes

1, 2

1,2

Minimum

916.400

600

Typical

916.500

3.2

750

Maximum

916.600

±100

1000

Units

MHz

kHz

Rejection

at f C - 21.4 MHz (Image)

at f C - 10.7 MHz (LO)

Ultimate

Temperature

Operating Case Temp.

Turnover Temperature

Turnover Frequency

Freq. Temp. Coefficient

T C

T O

f O

FTC

3, 4

-40

f C

0.032

+85

°C

MHz

ppm/°C 2

Frequency Aging

External Impedance

Absolute Value during the First Year

Series Inductance

|fA|

≤ 10

Coilcraft 8.2 nH Chip Inductor

ppm/yr

Shunt Capacitance

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

CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.

Notes:

RFM RF3181

Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture which is connected to a 50 ? 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.

www.RFM.com E-mail: info@rfm.com

?2008 by RF Monolithics, Inc.

Page 1 of 2

RF3181 - 3/21/08

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