LD25A datasheet(3/6 Pages) EPCOS

3 / 6 page

May 09, 2001

SAW Components

B3574 (LD25A)

868,30 MHz

Low Loss Filter

Preliminary Data

Characteristics

Reference temperature:

TA = -45 ... 95 ˚C

Terminating source impedance:

ZS = 50 Ω and matching network

Terminating load impedance:

ZL = 50 Ω and matching network

1)Temperature dependance 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

—

868,30

—

MHz

(center frequency between 3 dB points)

Minimum insertion attenuation

min

868,20 ... 868,40 MHz

—

4,2

5,7

(including loss in matching coils)

Amplitude ripple (p-p)

868,20 ... 868,40 MHz

—

0,5

2,0

868,16 ... 868,44 MHz

—

0,7

3,0

Relative attenuation (relative to

min)

rel

10,00 ... 600,00 MHz

—

600,00 ... 800,00 MHz

—

800,00 ... 848,00 MHz

—

848,00 ... 863,00 MHz

—

863,00 ... 866,80 MHz

—

870,00 ... 872,00 MHz

—

872,00 ... 882,00 MHz

—

882,00 ...1000,00 MHz

—

Impedance for pass band matching 2)

Input:

ZIN

RIN

CIN

—

360 || 1,3

—

Ω || pF

Output:

ZOUT = ROUT || COUT

—

380 || 1,3

—

Ω || pF

Temperature coefficient of frequency 1)

TCf

—

-0,03

—

ppm/K2

Frequency inversion point

10—40

°C

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