RF3181E - RFM - Datasheet.Directory

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Electrical Ch arac ter is tics

Characteristic Sym Notes Minimum Typical Maximum Units

Center Frequency at 25°C Absolute Frequency fc1, 2, 3 916.5 MHz

Tolerance from 916.50 MHz ∆fckHz

Insertion Loss IL 1, 3 2.7 4.0 dB

3 dB Bandwidth BW31, 3 500 750 900 kHz

Rejection relative to Min IL: 10 to 895 MHz

1, 3

40 50

895 to 906 MHz 30 35

906 to 910 MHz 25 30

922 to 925 MHz 40 50

925 to 933 MHz 15 20

933 to 940 MHz 30 35

940 to 1100 MHz 35 40

Temperature Freq. Temp. Coefficient FTC 3, 4 0.032 ppm/

°C2

Frequency Aging Absolute V alue duri ng the First Year |fA| 5 ≤10 ppm/yr

Impedance @ fC Input ZIN = RIN/CIN ZIN 154.2kΩ || 1.44pF

Output ZOUT = ROUT/COUT ZOUT 52.8kΩ || 1.30pF

Lid Symbolization (in addition to Lot and/or Date Codes) 698 || YWWS

Standard Reel Quantity 7 Inch Reel 9500 Pieces/Reel

Standard Reel Quantity 13 Inch Reel 3000 Pieces/Reel

• Ideal Front-end Filter for 916.5 MHz Wireless Receivers

• Low-loss, Coupled-resonator Quartz Design

• Simple External Impedance Matching

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

The RF3181E 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

IF, direct conversion and superregen. T ypical applications of these receivers are wireless remote-control and

security, data telemetry, and meter reading 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

SA W design and fabrication technology is utilized to achieve high performance and very low loss with simple

external impedance matching (not included).

916.5 MHz

SAW Filter

RF3181E

SM3030-6 C ase

3.0 x 3.0

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 and band-

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

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

3. Where noted specifications apply over the entire specified operating temperature range of -40 to 90 °C.

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

c)2].

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 manuf act ure, decreasing significantly in subsequent years.

6. The design, manufacturing process, and specifications of this device are subject to change.

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.

9. Tape and Reel Standard for ANSI/EIA 481.

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12 nH 2.8 nH

1 pF

12 nH2.8 nH

1 pF

Absolute Maximum Ratings

Rating Value Units

Input Power Level 14 dBm

DC V oltage 12 VDC

S torage Temperature -40 to +125 °C

Operable Temperature Range -40 to +125 °C

Soldering Temperature, 10 seconds / 5 cycles Maximum 260 °C

Pin Connection

1 Ground

2 Input

3 Ground

4 Ground

5 Output

6 Ground

Electrical Conne ction s

Case Dimensions

Dimension mm Inches

Min Nom Max Min Nom Max

A2.87 3.0 3.13 0.113 0.118 0.123

B2.87 3.0 3.13 0.113 0.118 0.123

C1.12 1.25 1.38 0.044 0.049 0.054

D0.77 0.90 1.03 0.030 0.035 0.040

E2.67 2.80 2.93 0.105 0.110 0.115

F1.47 1.6 1.73 0.058 0.063 0.068

G0.72 0.85 0.98 0.028 0.033 0.038

H1.37 1.5 1.63 0.054 0.059 0.064

I0.47 0.60 0.73 0.019 0.024 0.029

J1.17 1.30 1.43 0.046 0.051 0.056

Matching Circuit to 50Ω