B39389-K7257-M100 查看數據表（PDF） - EPCOS AG

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B39389-K7257-M100

SAW Components

EPCOS AG 

SAW Components

K 7257 M

IF Filter for Video / Multistandard Applications

33,90 MHz and 38,90 MHz

Data Sheet

Characteristics in M/N mode (switching input pin 2 connected to pin 1)

Reference temperature:

Terminating source impedance:

Terminating load impedance:

TA = 25 ˚C

ZS = 50 Ω

ZL = 2 kΩ || 3 pF

Insertion attenuation

Reference level for the

following data

α

37,40 MHz

min.

14,8

typ.

16,3

max.

17,8 dB

Relative attenuation

Picture carrier

Color carrier

Sound carrier

Adjacent picture carrier

Adjacent sound carrier

Lower sidelobe

Upper sidelobe

25,00

40,40

αrel

38,90 MHz

35,32 MHz

34,40 MHz

32,90 MHz

40,40 MHz

... 32,90 MHz

... 45,00 MHz

5,4

6,4

1,6

2,6

28,0

39,0

37,0

45,0

40,0

48,0

36,0

44,0

32,0

38,0

7,4 dB

3,6

— dB

— dB

— dB

— dB

— dB

Reflected wave signal suppression

1,3 µs ... 6,0 µs after main pulse

(test pulse 250 ns,

carrier frequency 37,40 MHz)

42,0

52,0

— dB

Feedthrough signal suppression

1,3 µs ... 1,2 µs before main pulse

(test pulse 250 ns,

carrier frequency 37,40 MHz)

—

50,0

— dB

Group delay ripple (p-p)

∆τ

35,32 ... 38,90 MHz

Impedance at 37,40 MHz

Input: ZIN = RIN || CIN

Output: ZOUT = ROUT || COUT

Temperature coefficient of frequency

TCf

—

50

— ns

—

1,3 ||19,5

— kΩ || pF

—

1,8 || 4,2

— kΩ || pF

—

–72

— ppm/K

4 Jan 27, 2003

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