B3555 datasheet(3/6 Pages) EPCOS

3 / 6 page

May 09, 2001

SAW Components

B3555

433,92 MHz

Low-loss Filter

Data Sheet

Characteristics

Reference temperature:

TA = 25 ˚C

Terminating source impedance:

ZS = 50 Ω and matching network

Terminating load impedance:

ZL = 50 Ω and matching network

1)Temperature dependence of fC: fC(TA) = fC(T0) (1 + TCf(TA – T0)2)

2) Impedance for passband matching bases on an ideal, perfect matching of the SAW filter to

source- and to load impedance (here 50 Ohm). After the SAW filter is removed and input imped-

ance into the input matching / output matching network is calculated.

The conjugate complex value of these characteristic impedances are the input and output imped-

ances for flat passband. For more details, we refer to EPCOS application note #4.

min.

typ.

max.

Center frequency

—

433,96

—

MHz

(center frequency between 3 dB points)

Minimum insertion attenuation

min

433,80 ... 434,12 MHz

—

2,2

4,0

Pass band (relative to

min)

433,715 ... 434,205 MHz

—

1,0

2,0

433,675 ... 434,245 MHz

—

1,0

3,0

433,615 ... 434,305 MHz

—

2,0

6,0

Relative attenuation (relative to

min)

rel

10,00 ... 400,00 MHz

—

400,00 ... 429,10 MHz

—

429,10 ... 430,70 MHz

—

430,70 ... 432,00 MHz

—

435,30 ... 436,80 MHz

—

436,80 ... 438,40 MHz

—

438,40 ... 450,00 MHz

—

450,00 ... 600,00 MHz

—

Impedance for pass band matching 2)

Input:

ZIN

RIN

CIN

—

225 || 3,4

—

Ω || pF

Output:

ZOUT = ROUT || COUT

—

225 || 3,4

—

Ω || pF

Temperature coefficient of frequency 1)

TCf

—

–0,03

—

ppm/K2

Frequency inversion point

—25—

°C

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