RF3171 - RFM (RF Monolithics, Inc.)

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Electric al Ch arac teri st ics

Characteristic Sym Notes Minimum Typical Maximum Units

Nominal Frequency fc1, 2 417.920 418.080 MHz

Tolerance from 418.0 MHz ∆fc ±80 dB

Insertion Loss IL 1 1.8 3.5 dB

3 dB Bandwidth BW31, 2 500 600 800 kHz

Rejection at fC - 21.4 MHz (Image)

40 50

dBat fC - 10.7 MHz (LO) 15 30

Ultimate 80

Temperature Operating Case Temp. TC

3, 4

-35 +85 °C

Turnover Temperature TO15 25 35 °C

Turnover Frequency fOfCMHz

Freq. Temp. Coefficient FTC 0.032 ppm/°C2

Frequency Aging Absolute Value during the First Year |fA| 5 ≤10 ppm/yr

Impedance @ FCZIN=RIN//CIN 1392 // 2.84 pF

ZOUT=ROUT//COUT 476 Ω // 3.17 pF

Lid Symbolization (in addition to Lot and/or Date Codes) RFM RF3171

TO39-3 Case

• Ideal Front-End Filter for Wireless Receiver in the UK and USA

• Low-Loss, Coupled-Resonator Quartz Design

• Simple External Impedance Matching

• Rugged TO39 Hermetic Package

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

The RF3171 is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to provide

front-end selectivity in 418. 0 MHz receivers. Receiver designs using this filter include superhet wi th 10.7 MHz

direct conversion and superregen. Ty pical applications of these receivers are wireless remote-control and

security devices operating in the USA under FCC Part 15.

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.

418.0 MHz

SAW Filter

RF3171

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, fc. Note that insertion loss, bandwidth,

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

2. The frequency fc is defined as the midpoint between the 3dB frequencies.

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

4. The turnover temperature, TO, is the temperature of maximum (or turnover) frequency , fo. The nominal frequency at any case temperature, Tc, may

be calculated from: f = fo[1 - FTC (To-T

)

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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Absolute Maximum Ratings

Typical Filter Response

Typical filter responses are shown below. The actual response is

dependent on external impedance matching and circuit layout. Illustrated

frequencies and minimum rejection for LO and IMAGE are shown only for

superhet receivers with 10.7 MHz IF.

Electrical Connections

Typical Demonstration Circuit

Case Design

Rating Value Units

Incident RF Power +13 dBm

DC Voltage Between Any Two Pins (Observe ESD Precautions) ±30 VDC

Case Temperature5-45 to +85 °C

Soldering Temperature (10 seconds / 5 cycles max.) 260 °C

-10

-20

-30

-40

-50

-60

-70

-80 5 MHz/div

Fre

uenc

Image

Amplitude Response

Bottom View

Pin 1 Pin 2

Pin Connection

1 Input or Output

2 Output or Input

3 Case Ground

Fr om 50

Network

Analyzer

Ω

To 50

Ω

Network

Analyzer

Dimensions Millimeters Inches

Min Max Min Max

A 9.40 0.370

B 3.18 0.125

C 2.50 3.50 0.098 0.138

D 0.46 Nominal 0.018 Nominal

E 5.08 Nominal 0 .200 Nominal

F 2.54 Nominal 0.100 Nominal

G 2.54 Nominal 0.100 Nominal

H 1.02 0.040

J 1.40 0.055

-1

-2

-3

-4

-5

-6

-7

-8 150 KHz/div

Fre

uenc

Amplitude Response

Min 3dB

Passband

at 25 C

45°

(2 places)

(3 places)