B3558 datasheet(3/7 Pages) EPCOS

3 / 7 page

May 09, 2001

SAW Components

B3558

449,10 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

—

449,14

—

MHz

(center frequency between 3 dB points)

Minimum insertion attenuation

min

449,00 ... 449,28 MHz

—

2,2

3,2

Pass band (relative to

min)

448,965 ... 449,315 MHz

—

0,8

3,0

448,930 ... 449,350 MHz

—

1,5

6,0

Relative attenuation (relative to

min)

rel

10,00 ... 428,00 MHz

—

428,00 ... 439,00 MHz

—

439,00 ... 448,10 MHz

—

450,10 ... 459,00 MHz

—

459,00 ... 550,00 MHz

—

550,00 ... 1000,00 MHz

—

Impedance for pass band matching 2)

Input:

ZIN

RIN

CIN

—

210 || 2,70

—

Ω || pF

Output:

ZOUT = ROUT || COUT

—

210 || 2,70

—

Ω || pF

Temperature coefficient of frequency 1)

TCf

—

–0,03

—

ppm/K2

Frequency inversion point

—

°C

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