RF1211 RFM, RF1211 Datasheet

Filters 315.00MHz Narrowband Receiver Front End

RF1211

Manufacturer Part Number

RF1211

Description

Filters 315.00MHz Narrowband Receiver Front End

Manufacturer

RFM

Type

SAW Filtersr

Datasheet

1.RF1211.pdf (2 pages)

Specifications of RF1211

Product

RF SAW Filters

Frequency

315 MHz

Frequency Range

314.92 MHz to 315.8 MHz

Package / Case

TO-39-3

Operating Temperature Range

- 40 C to + 85 C

Voltage Rating

30 V

Termination Style

Radial

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Electrical Characteristics

www.RFM.com

Notes:

• Ideal Front-End Filter for USA Automotive Wireless Receivers

• Low-Loss, Coupled-Resonator Quartz Design

• Simple External Impedance Matching

• Rugged TO39 Hermetic Package

• Complies with Directive 2002/95/EC (RoHS)

The RF1211 is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed

to provide 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 wireless remote-control and security devices (especially for automotive

keyless entry) operating in the USA under FCC Part 15, in Canada under DOC 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 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.

Characteristic

Center Frequency at 25°C

Insertion Loss

3 dB Bandwidth

Rejection

Temperature

Frequency Aging

External Impedance

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

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

VSWR

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

The frequency f

Unless noted otherwise, specifications apply over the entire specified operating temperature range.

The turnover temperature, T

be calculated from: f = f

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.

CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.

1.2:1. The test fixture L and C are adjusted for minimum insertion loss at the filter center frequency, f

E-mail: info@rfm.com

is defined as the midpoint between the 3dB frequencies.

[1 - FTC (T

Absolute Frequency

Tolerance from 315.0 MHz

at f

Ultimate

Operating Case Temp.

Turnover Temperature

Turnover Frequency

Freq. Temp. Coefficient

Series Inductance

Shunt Capacitance

Absolute Value during the First Year

, is the temperature of maximum (or turnover) frequency, f

- 21.4 MHz (Image)

- 10.7 MHz (LO)

- T

)

Sym

FTC

|fA|

Notes

1, 2

3, 4

. The nominal frequency at any case temperature, T

Minimum

314.92

500

-40

RFM RF1211

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

Typical

315.00

0.032

700

1.7

. Note that insertion loss, bandwidth,

SAW Filter

315.0 MHz

RF1211

TO39-3 Case

Maximum

315.080

±80

800

+85

3.0

test system with

RF1211 - 3/21/08

ppm/°C

ppm/yr

Page 1 of 2

Units

MHz

kHz

°C

, may

Related parts for RF1211

RF1211 Summary of contents

Page 1

... Rugged TO39 Hermetic Package • Complies with Directive 2002/95/EC (RoHS) The RF1211 is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to provide 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 ...

Page 2

... D (3 places places) Millimeters Min Max A 9.40 B 3.18 C 2.50 3.50 D 0.46 Nominal E 5.08 Nominal F 2.54 Nominal G 2.54 Nominal H 1. 45° Inches Min Max 0.370 0.125 0.098 0.138 0.018 Nominal 0.200 Nominal 0.100 Nominal 0.100 Nominal 0.040 0.055 Page RF1211 - 3/21/08 ...

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