B3688 datasheet(3/5 Pages) EPCOS

Part #	B3688

Description	SAW Components Low-Loss Filter 499,25 MHz

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Jan 29, 2003

SAW Components

B3688

499,25 MHz

Low-Loss Filter

Data Sheet

Characteristics

Operating temperature:

T

= -25 ... +75 ˚C

Terminating source impedance:

ZS =50 Ω and matching network

Terminating load impedance:

ZL =50 Ω and matching network

Matching circuit:

Cp1 = 14pF 2)

Ls2 = 21nH 2)

Ls3 = 22nH 2)

Cp4 = 13pF 2)

1) Temperature dependance of fc: fc(TA) = fc(T0)(1 + TCf(TA – T0)2)

2) Element values depend on PCB layout

min.

typ.

max.

Nominal frequency

fN

—

499,25

—

MHz

Insertion attenuation at

fN (T=25 ˚C)

α

N

6,0

8,0

9,0

dB

Variation of insertion att. (rel. to

α

N)

α

rel

——

±0,9

dB

Frequency response

3 dB Lower frequency

fL 3dB

—

498,27

498,75 MHz

3 dB Upper frequency

fU 3dB

499,75

500,23

—

MHz

35 dB Lower frequency

fL35dB

496,25

496,75

—

MHz

35 dB Upper frequency

fU35dB

—

501,85

502,25 MHz

Amplitude ripple (peak to adjacent valley)

fN ± 100 kHz

—

0,5

dB

Relative attenuation

α

rel

fN - 200,0 MHz ... fN - 10,0 MHz

40

55

—

dB

fN - 10,0 MHz ... fN -

3,0 MHz

35

48

—

dB

fN +

3,0 MHz ...

fN + 10,0 MHz

35

43

—

dB

fN + 10,0 MHz ... fN + 200,0 MHz

40

51

—

dB

Temperature coefficient of frequency 1)

TCf

—

– 0,036

—

ppm/K2

Turnover temperature

T0

—25

—

˚C

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