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©2009 by RF Monolithics, Inc.

SF2185A - 6/11/09

Electrical Characteristics

Characteristic

Sym

Notes

Min

Typ

Max

Units

Center Frequency

1

69.8

70.0

70.2

MHz

Minimum Insertion Loss

1

10.6

12.0

dB

1 dB Bandwidth

19.0

9.7

MHz

3 dB Bandwidth

1

9.5

10.0

MHz

35 dB Bandwidth

1

11.7

13.0

MHz

10 to 63 MHz

3

40

45

dB

78 to 140 MHz

3

40

45

dB

1, 2, 3

0.6

1.0

80

160

Operating Temperature

1

-20

+80

°C

Source Impedance

50

ohm

Load Impedance

50

ohm

Frequency Temperature Coefficient

-94

ppm/°C

Impedance Matching to 50

Ω

External Source/Load L

Case Style

SM13365-12 13.3 x 6.5 mm Nominal Footprint

Lid Symbolization (YY = year, WW = week)

RFM SF2185A YYWW

• Precision IF SAW Filter

• Hermetic 13.3 x 6.5 mm Surface-mount Case

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

Absolute Maximum Ratings

Rating

Value

Units

Maximum Incident Power in Passband

+10

dBm

Maximum DC Voltage between any Two Terminals

30

VDC

Storage Temperature Range in Tape and Reel

-40 to +85

°C

Suitable for Lead-free Soldering - Maximum Soldering Profile

260 °C for 30 s

70.00 MHz

SAW Filter

SF2185A

SM13365-12

1.

Unless noted otherwise, all specifications apply over the operating temperature range with filter soldered to the specified demonstration board with impedance

matching to 50

Ω and measured with 50 Ω network analyzer.

2.

Unless noted otherwise, all frequency specifications are referenced to the nominal center frequency, fc.

3.

Rejection is measured as attenuation below the minimum IL point in the passband. Rejection in final user application is dependent on PCB layout and external

impedance matching design. See Application Note No. 42 for details.

4.

Part to part absolute delay measurement records the absolute delay mean across 1 dB passband.

5.

"LRIP" or "L" after the part number indicates "low rate initial production" and "ENG" or "E" indicates "engineering prototypes.”

6.

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

7.

Either Port 1 or Port 2 may be used for either input or output in the design. However, impedances and impedance matching may vary between Port 1 and Port

2, so that the filter must always be installed in one direction per the circuit design.

8.

US and international patents may apply.

Pb

CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.

Notes:

Preliminary