SAW Components
Data Sheet K 7257 M
SAW Components
IF Filter for Video / Multistandard Applications
Data Sheet
Standard
s
B/G
s
L/L’
s
M/N
K 7257 M
33,90 MHz and 38,90 MHz
Plastic package
SIP5K
Features
s
TV IF filter switchable from B/G,L/L’ mode to
s
s
s
s
M/N mode
B/G,L/L’ mode with Nyquist slope and sound
suppression
Highly reduced group delay predistortion as
compared to standard B/G, half
M/N mode with Nyquist slope and sound sup-
pression
Constant group delay
Dimensions in mm, approx. weight 1,0 g
Terminals
s
Tinned CuFe alloy
Pin configuration
1
2
3
4, 5
Input
Switching input
Chip carrier – ground
Output
1
4
2
5
3
Type
K 7257 M
Ordering code
B39389-K7257-M100
Marking and package
according to
C61157-A1-A15
Packing
according to
F61074-V8067-Z000
Maximum ratings
Operable temperature range
Storage temperature range
DC voltage
AC voltage
T
A
T
stg
V
DC
V
pp
–25/+65
–40/+85
5
10
˚C
˚C
V
V
between any terminals
between any terminals
2
Jan 27, 2003
SAW Components
IF Filter for Video / Multistandard Applications
Data Sheet
Characteristics in B/G, L/L’ mode (switching input pin 2 connected to ground)
Reference temperature:
Terminating source impedance:
Terminating load impedance:
K 7257 M
33,90 MHz and 38,90 MHz
T
A
= 25 ˚C
Z
S
= 50
Ω
Z
L
= 2 kΩ || 3 pF
min.
typ.
16,6
max.
18,1
dB
Insertion attenuation
Reference level for the
following data
Relative attenuation
Picture carrier
Picture carrier
Color carrier
Sound carrier
NICAM sound carrier
Adjacent picture carrier
α
37,40 MHz
α
rel
38,90
33,90
34,47
33,40
33,05
30,90
31,90
32,40
40,15
40,40
41,40
25,00 ... 31,90
40,40 ... 45,00
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
5,0
—
-0,5
28,0
—
45,0
47,0
45,0
39,0
40,0
40,0
40,0
36,0
42,0
6,0
7,9
0,5
43,0
36,0
60,0
60,0
60,0
52,0
53,0
50,0
46,0
43,0
52,0
7,0
—
1,5
—
—
—
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
15,1
Adjacent sound carrier
Lower sidelobe
Upper sidelobe
Reflected wave signal suppression
1,2
µs
... 6,0
µs
after main pulse
(test pulse 250 ns,
carrier frequency 37,40 MHz)
Feedthrough signal suppression
1,3
µs
... 1,2
µs
before main pulse
(test pulse 250 ns,
carrier frequency 37,40 MHz)
Group delay predistortion
(reference frequency 38,90 MHz)
36,90 MHz
34,47 MHz
Impedance
at 37,40 MHz
Input:
Z
IN
=
R
IN
||
C
IN
Output:
Z
OUT
=
R
OUT
||
C
OUT
Temperature coefficient of frequency
∆τ
50,0
56,0
—
dB
ns
—
—
—
—
–50
50
1,2 ||18,6
1,8 || 4,2
–72
—
—
—
—
—
ns
ns
kΩ || pF
kΩ || pF
ppm/K
TC
f
—
3
Jan 27, 2003
SAW Components
IF Filter for Video / Multistandard Applications
Data Sheet
Characteristics in M/N mode (switching input pin 2 connected to pin 1)
Reference temperature:
Terminating source impedance:
Terminating load impedance:
K 7257 M
33,90 MHz and 38,90 MHz
T
A
= 25 ˚C
Z
S
= 50
Ω
Z
L
= 2 kΩ || 3 pF
min.
typ.
16,3
max.
17,8
dB
α
37,40 MHz
14,8
Insertion attenuation
Reference level for the
following data
Relative attenuation
Picture carrier
Color carrier
Sound carrier
Adjacent picture carrier
Adjacent sound carrier
Lower sidelobe
Upper sidelobe
α
rel
38,90
35,32
34,40
32,90
40,40
25,00 ... 32,90
40,40 ... 45,00
MHz
MHz
MHz
MHz
MHz
MHz
MHz
5,4
1,6
28,0
37,0
40,0
36,0
32,0
6,4
2,6
39,0
45,0
48,0
44,0
38,0
7,4
3,6
—
—
—
—
—
dB
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)
Feedthrough signal suppression
1,3
µs
... 1,2
µs
before main pulse
(test pulse 250 ns,
carrier frequency 37,40 MHz)
Group delay ripple (p-p)
35,32 ... 38,90 MHz
Impedance
at 37,40 MHz
Input:
Z
IN
=
R
IN
||
C
IN
Output:
Z
OUT
=
R
OUT
||
C
OUT
Temperature coefficient of frequency
∆τ
42,0
52,0
—
dB
—
50,0
—
dB
—
—
—
50
1,3 ||19,5
1,8 || 4,2
–72
—
—
—
—
ns
kΩ || pF
kΩ || pF
ppm/K
TC
f
—
4
Jan 27, 2003
SAW Components
IF Filter for Video / Multistandard Applications
Data Sheet
Frequency response in B/G, L/L’ mode
K 7257 M
33,90 MHz and 38,90 MHz
5
Jan 27, 2003
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