®

RF Monolithics, Inc.

Phone: (972) 233-2903

Fax: (972) 387-8148

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.

RF1211B-030102

Electrical Characteristics

Characteristic

Sym

Notes

Minimum

Typical

Maximum

Units

Nominal Frequency

1, 2

315.00

MHz

Tolerance from 315.0 MHz

∆fc

±80

dB

Insertion Loss

IL

1

1.7

3.0

dB

3 dB Bandwidth

1, 2

500

700

800

kHz

Rejection

1

40

50

dB

15

40

Ultimate

80

Temperature

Operating Case Temp.

3, 4

-40

+85

°C

Turnover Temperature

22

37

52

°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

86 nH (Pin 1), 82 nH (Pin 2)

Shunt Capacitance

C

9

pF

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

RFM RF1211B

SM8558-8 Case

•

Ideal Front-End Filter for Domestic Wireless Receivers

•

Low-Loss, Coupled-Resonator Quartz Design

•

Simple External Impedance Matching

•

•

Complies with Directive 2002/95/EC (RoHS)

The RF1211B is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to pro-

vide front-end selectivity in 315.0 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 (especially for automotive keyless entry) operating in the USA

under FCC Part 15, in Canada under RSS-210, and in Italy

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). Our new patent pending solder seal process utilizes a

Faraday shield lid, which improves out of band rejection.

315.0 MHz

SAW Filter

RF1211B

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. Unless noted otherwise, 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.