EPCOS AG 2006. Reproduction, publication and dissemination of this data sheet, enclosures
hereto and the information contained therein without EPCOS' prior express consent is prohibited.
SAW Components
SAW filter
Short range devices
Series/type:
Ordering code:
B3732
B39431B3732H110
Date:
Version:
June 07, 2006
2.1
2
June 07, 2006
B3732
433.92 MHz
Please read
cautions and warnings and
important notes at the end of this document.
SAW Components
SAW filter
Data sheet
Application
s
Low-loss RF filter for remote control receivers
s
Balanced and unbalanced operation possible
Features
s
Package size 3.0 x 3.0 x 1.0 mm
3
s
Package code DCC6E
s
RoHS compatible
s
Approximate weight 0.037 g
s
Package for Surface Mount Technology
(SMT)
s
Ni, gold-plated terminals
s
Lead free soldering compatible with J - STD20C
s
Passivation layer Elpas
s
AEC-Q200 qualified component family
s
Electrostactic Sensitive Device (ESD)
Pin configuration
1)
s
1
Input (recommended) or input ground
s
2
Input ground (recommended) or input
s
4
Output (recommended) or output ground
s
5
Output ground (recommended) or output
s
3,6
To be grounded
1) The recommended pin configuration usually offers best
suppression of electrical crosstalk. The filter characteris-
tics refer to this configuration.
3
June 07, 2006
B3732
433.92 MHz
SAW Components
SAW filter
Data sheet
Please read
cautions and warnings and
important notes at the end of this document.
Characteristics
Temperature range for specification:
T
= 45 C to +95 C
Terminating source impedance:
Z
S
=
50
and matching network
Terminating load impedance:
Z
L
=
50
and matching network
min.
typ.
@ 25 C
max.
Center frequency
f
C
--
433.92
--
MHz
Minimum insertion attenuation
min
incl. loss in matching elements (Q
L
= 47)
--
2.4
3.1
dB
excl. loss in matching elements
--
1.7
2.4
dB
Pass band (relative to
min
)
433.77 ...
434.07 MHz
--
0.6
2.0
dB
433.74 ...
434.10 MHz
--
0.8
3.0
dB
433.70 ...
434.14 MHz
--
1.2
6.0
dB
Filter bandwidth
rel
3
dB
0.66
0.72
0.78
MHz
Relative attenuation (relative to
min
)
rel
10.00 ...
414.00 MHz
55
60
--
dB
414.00 ...
426.00 MHz
48
53
--
dB
426.00 ...
430.50 MHz
24
28
--
dB
430.50 ...
431.72 MHz
30
35
--
dB
431.72 ...
431.97 MHz
40
52
--
dB
431.97 ...
432.07 MHz
30
52
--
dB
432.07 ...
432.12 MHz
25
52
--
dB
432.12 ...
433.10 MHz
15
18
--
dB
434.92 ...
444.00 MHz
15
20
--
dB
444.00 ...
500.00 MHz
40
45
--
dB
500.00 ...
810.00 MHz
50
55
--
dB
810.00 ... 1500.00 MHz
60
50
--
dB
1500.00 ... 2500.00 MHz
53
58
--
dB
Impedance for pass band matching
1)
1)
Impedance for passband matching bases on an ideal, perfect matching of the SAW filter to source- and to load
impedance (here 50 Ohm). After removal of the SAW filter the input impedance of the input and output match-
ing network is calculated. The conjugate complex value of these characteristic impedances are the input and
output impedances for flat passband. For more details we refer to EPCOS application note #4.
Input:
Z
IN
= R
IN
|| C
IN
--
240 || 3.0
--
|| pF
Output: Z
OUT
= R
OUT
|| C
OUT
--
240 || 3.0
--
|| pF
4
June 07, 2006
B3732
433.92 MHz
Please read
cautions and warnings and
important notes at the end of this document.
SAW Components
SAW filter
Data sheet
Maximum ratings
Operable temperature range T
45/+120 C
Storage temperature range
T
stg
45/+120 C
DC voltage
V
DC
6
V
Source power
P
S
10
dBm
source impedance 50
5
June 07, 2006
B3732
433.92 MHz
SAW Components
SAW filter
Data sheet
Please read
cautions and warnings and
important notes at the end of this document.
Matching network to 50
(element values depend on pcb layout and equivalent circuit)
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 DCC6E package, pinning 1,4 (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.
C
p1
= 3.3 pF
L
s2
= 33 nH
L
s3
= 33 nH
C
p4
= 3.3 pF
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