SAW Components
Data Sheet B3571
SAW Components
Low-loss Filter
Data Sheet
B3571
868,60 MHz
Ceramic package
QCC8C
Features
s
RF low-loss filter for remote control receivers
s
Package for
Surface Mounted Technology
(SMT)
Terminals
s
Ni, gold plated
typ. dimensions in mm, approx. weight 0,1 g
Pin configuration
2
1,3
6
5,7
4,8
Input
Input Ground
Output
Output Ground
Case - Ground
Type
B3571
Ordering code
B39871-B3571-U310
Marking and package
according to
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
–45/+90
–45/+90
0
0
˚C
˚C
V
dBm
source impedance 50
Ω
2
May 09, 2001
SAW Components
Low-loss Filter
Data Sheet
Characteristics
Reference temperature:
Terminating source impedance:
Terminating load impedance:
B3571
868,60 MHz
T
A
= 25 ˚C
Z
S
= 50
Ω
and matching network
Z
L
= 50
Ω
and matching network
min.
typ.
868,69
max.
—
MHz
Center frequency
(center frequency between 3 dB points)
f
C
—
Minimum insertion attenuation
α
min
868,00 ... 869,38 MHz
Pass band
(relative to
α
min
)
868,00 ... 869,38 MHz
867,92 ... 869,46 MHz
Relative attenuation
(relative to
α
min
)
10,00 ... 700,00
700,00 ... 830,00
830,00 ... 858,00
858,00 ... 866,40
871,00 ... 880,00
880,00 ... 910,00
910,00 ...1000,00
α
rel
MHz
MHz
MHz
MHz
MHz
MHz
MHz
—
3,1
4,6
dB
—
—
1,5
2,0
3,0
6,0
dB
dB
50
33
30
20
17
30
33
55
38
35
25
22
35
38
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
Impedance
for pass band matching
2)
Input:
Z
IN
=
R
IN
||
C
IN
Output:
Z
OUT
=
R
OUT
||
C
OUT
Temperature coefficient of frequency
1)
Frequency inversion point
1)
Temperature
2)
—
—
226 || 2,30
222 || 2,20
–0,03
25
—
—
—
—
Ω
|| pF
Ω
|| pF
ppm/K
2
°C
TC
f
T
0
—
—
dependence of
f
C
:
f
C
(T
A
) =
f
C
(T
0
) (1 +
TC
f
(T
A
–
T
0
)
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
SAW Components
Low-loss Filter
Data Sheet
Matching network to 50
Ω
(element values depend on pcb layout and equivalent circuit)
C
p1
= 3,3 pF
L
s2
= 15 nH
L
s3
= 15 nH
C
p4
= 3,3 pF
B3571
868,60 MHz
Minimising the crosstalk
For a good ultimate rejection a low crosstalk is necessary. Low crosstalk can be realised with
a good RF layout.
Grounding pins for input transducer are pin 1,3 and for output transducer 5,7. Close to those
pins via holes (through holes) should be placed to achieve a low impedance path to system
ground. If a grounding plane at the top side of the PCB is present, the grounding plane can be
connected to pin 1,3,5,7 at the top side too.
The optimised PCB layout, including matching network for transformation to 50 Ohm, is shown
here.
Optimised PCB layout for SAW filters in QCC8C package, pinning 2,6 (top side, scale 1:1)
The bottom side is a copper plane (system ground area).
For good contact of the upper grounding area with the lower side it is necessary to place
enough via holes.
4
May 09, 2001
SAW Components
Low-loss Filter
Data Sheet
Normalized frequency response
B3571
868,60 MHz
Normalized frequency response
(wideband)
5
May 09, 2001
FPGA/CPLD
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