B3557 查看數據表（PDF） - EPCOS AG

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B3557

SAW Components Low-loss Filter

EPCOS AG 

SAW Components

Low-loss Filter

Data Sheet

Characteristics

Reference temperature:

Terminating source impedance:

Terminating load impedance:

Center frequency

(center frequency between 3 dB points)

B3557

434,42 MHz

TA = 25 ˚C

ZS = 50 Ω and matching network

ZL = 50 Ω and matching network

min.

typ.

max.

fC

—

434,46

— MHz

Minimum insertion attenuation

αmin

434,30 ... 434,62 MHz

—

2,0

4,0 dB

Pass band (relative to αmin)

434,24 ... 434,68 MHz

434,18 ... 434,74 MHz

—

1,5

3,0 dB

—

2,0

6,0 dB

Relative attenuation (relative to αmin)

αrel

10,00 ... 414,50 MHz

45

50

— dB

414,50 ... 428,50 MHz

40

45

— dB

428,50 ... 433,42 MHz

15

25

— dB

435,42 ... 442,50 MHz

10

20

— dB

442,50 ... 550,00 MHz

35

40

— dB

550,00 ...1000,00 MHz

42

45

— dB

Impedance for pass band matching 2)

Input: ZIN = RIN || CIN

Output: ZOUT = ROUT || COUT

Temperature coefficient of frequency 1)

TCf

Frequency inversion point

T0

— 270 || 2,7 — Ω || pF

— 250 || 3,2 — Ω || pF

—

–0,03

— ppm/K2

—

25

— °C

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.

3 May 09, 2001

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