The following products presented in this data sheet are being withdrawn:
B39461B3578U310
Date of withdrawal:
Deadline for last orders:
Last shipments:
22−DEC−04
31−MAR−05
30−JUN−05
For further information please contact your nearest EPCOS sales office, which will also support
you in selecting a suitable substitute. The addresses of the sales offices are given on the Internet
at www.epcos.com/sales.
1
SAW Components
Low-loss Filter
Data Sheet
(B3578)
463,70 MHz
Ceramic package
QCC8C
Features
s
RF low-loss filter for remote control receivers
s
Package for
Surface Mounted Technology
(SMT)
s
Balanced and unbalanced operation possible
Terminals
s
Ni, gold plated
typ. dimensions in mm, approx. weight 0,1 g
Pin configuration
1
2
5
6
4,8
3,7
Input Ground
Input
Output
Output Ground
Case - Ground
to be grounded
Type
B3578
Ordering code
B39461-B3578-U310
Marking
C61157-A7-A56
Packing
according to
F61074-V8070-Z000
Electrostactic Sensitive Device
(ESD)
Maximum ratings
Operable temperature range
Storage temperature range
DC voltage
Source power
T
A
T
stg
V
DC
P
S
–40/+95
–40/+95
0
10
˚C
˚C
V
dBm
source impedance 50
Ω
2
Nov 28, 2002
SAW Components
Low-loss Filter
Data Sheet
Characteristics
Reference temperature:
Terminating source impedance:
Terminating load impedance:
(B3578)
463,70 MHz
T
A
= -40 ... 95 ˚C
Z
S
= 50
Ω
and matching network
Z
L
= 50
Ω
and matching network
min.
typ.
463,70
max.
—
MHz
Center frequency
(center frequency between 3 dB points)
f
C
—
Minimum insertion attenuation
α
min
463,57 ... 463,83 MHz
Pass band
(relative to
α
min
)
463,57 ... 463,83 MHz
463,52 ... 463,88 MHz
Relative attenuation
(relative to
α
min
)
10,00 ... 443,00
443,00 ... 453,50
453,50 ... 461,70
461,70 ... 462,70
α
rel
MHz
MHz
MHz
MHz
—
1,9
3,2
dB
—
—
0,8
1,0
2,0
3,0
dB
dB
48
44
30
12
15
40
45
53
49
35
15
18
45
50
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
464,70 ... 471,70 MHz
471,70 ... 550,00 MHz
550,00 ...1000,00 MHz
Impedance
for pass band matching
Input:
Z
IN
=
R
IN
||
C
IN
Output:
Z
OUT
=
R
OUT
||
C
OUT
Temperature coefficient of frequency
1)
Frequency inversion point
1)
Temperature
—
—
168 || 2,60
164 || 2,80
–0,03
—
—
—
—
25
Ω
|| pF
Ω
|| pF
ppm/K
2
°C
TC
f
T
0
—
5
dependence of
f
C
:
f
C
(T
A
) =
f
C
(T
0
) (1 +
TC
f
(T
A
–
T
0
)
2
)
3
Nov 28, 2002
SAW Components
Low-loss Filter
Data Sheet
(B3578)
463,70 MHz
Matching network to 50
Ω
(element values depend on pcb layout and equivalent circuit)
C
p1
= 1,2 pF
L
s2
= 27 nH
L
s3
= 27 nH
C
p4
= 1,2 pF
Minimising the crosstalk
For a good ultimate rejection a low crosstalk is necessary. Low crosstalk can be realised with
a good RF layout. The major crosstalk mechanism is caused by the “ground-loop” problem.
Grounding loops are created if input-and output transducer GND are connected on the top-side
of the PCB and fed to the system grounding plane by a common via hole. To avoid the common
ground path, the ground pin of the input- and output transducer are fed to the system ground
plane (bottom PCB plane) by their own via hole. The transducers’ grounding pins should be
isolated from the upper grounding plane.
A common GND inductivity of 0.5nH degrades the ultimate rejection (crosstalk) by 20dB.
The optimised PCB layout, including matching network for transformation to 50 Ohm, is shown
here. In this PCB layout the grounding loops are minimised to realise good ultimate rejection.
Optimised PCB layout for SAW filters in QCC8C package, pinning 2,5 (top side, scale 1:1)
The bottom side is a copper plane (system ground area). The input and output grounding pins
are isolated and connected to the common ground by separated via holes.
For good contact of the upper grounding area with the lower side it is necessary to place
enough via holes.
4
Nov 28, 2002
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