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©2009 by RF Monolithics, Inc.

SF2145B - 7/9/09

Electrical Characteristics

Characteristic

Sym

Notes

Min

Typ

Max

Units

Center Frequency

1

895

MHz

Source Impedance, single ended

50

Ω

Load Impedance, single ended

50

Ω

1 dB Bandwidth

18

MHz

Insertion Loss, 894 to 895.5 MHz

IL

8.5

9.0

dB

Insertion Loss Variation:

Any point within 894 to 895.5 MHz

measured at a constant temperature with the

RF input level varying from +10 to +20 dBm

0.3

∆dB

Amplitude Ripple, 894 to 895.5 MHz

.35

.75

dB

Average Group Delay, 894 to 895.5 MHz

804

814

824

ns

Group Delay Variation, 894.0 to 895.5 MHz

10

25

10

15

dB

Temperature Coefficient

-18

ppm/K

Case Style

SMP-03 7.0 x 5.0 mm Nominal Footprint

Lid Symbolization (YY=year, WW=week) See note 4

RFM SF2145B YYWW

SMP-03

895 MHz

SAW Filter

SF2145B

1.

Unless noted otherwise, all specifications apply over the operating tem-

perature range with filter soldered to the specified demonstration board

with impedance matching to 50

Ω and measured with 50 Ω network ana-

lyzer.

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.

"LRIP" or "L" after the part number indicates "low rate initial production"

and "ENG" or "E" indicates "engineering prototypes."

5.

The design, manufacturing process, and specifications of this filter are

subject to change.

6.

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.

7.

US and international patents may apply.

8.

RFM, stylized RFM logo, and RF Monolithics, Inc., are registered

trademarks of RF Monolithics, Inc.

CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.

Notes:

• SAW Filter, 895 MHz, 15 MHz BW

• 7.0 X 5.0 mm 10 pin Surface-Mount Case

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

Absolute Maximum Ratings

Rating

Value

Units

Maximum Incident Power in Passband

+20

dBm

Maximum DC Voltage Between any Two Terminals

0

VDC

Operating Temperature Range

-20 to +70

°C

Pb