B39321B3781Z810 [EPCOS]
SAW filter Short range devices; SAW滤波器短程设备
| 型号： | B39321B3781Z810 |
| 厂家： | 
EPCOS |
| 描述： | SAW filter Short range devices |
| 文件： | 总9页 (文件大小：83K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SAW Components
SAW filter
Short range devices
Series/type:
B3781
Ordering code:
B39321B3781Z810
Date:
Version:
April 16, 2007
2.0
EPCOS AG 2007. 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
B3781
315.00 MHz
Data sheet
Application
■ Low-loss RF filter for remote control receivers
■ Balanced and unbalanced operation possible
Features
■ Package size 3.8 x 3.8 x 1.5 mm3
■ Package code QCC8B
■ RoHS compatible
■ Approximate weight 0.07 g
■ Package for Surface Mount Technology
(SMT)
■ Ni, gold-plated terminals
■ Lead free soldering compatible with J - STD20C
■ Passivation layer Elpas
■ AEC-Q200 qualified component family
■ Electrostactic Sensitive Device (ESD)
Pin configuration1)
■ 1
■ 2
■ 5
■ 6
■ 4,8
■ 3,7
Input ground (recommended) or input
Input (recommended) or input ground
Output (recommended) or output ground
Output ground (recommended) or output
Case - ground
To be grounded
1) The recommended pin configuration usually offers best
suppression of electrical crosstalk. The filter characteris-
tics refer to this configuration.
Please read cautions and warnings and
important notes at the end of this document.
2
April 16, 2007
SAW Components
SAW filter
B3781
315.00 MHz
Data sheet
Characteristics
Temperature range for specification:
Terminating source impedance:
Terminating load impedance:
T
ZS
ZL
= –40 ˚C to +85 ˚C
=
=
50Ω and matching network
50Ω and matching network
min.
typ.
max.
@ 25 ˚C
315.00
Center frequency
fC
αmin
—
—
MHz
Minimum insertion attenuation
incl. loss in matching elements
excl. loss in matching elements
—
—
1.8
1.1
2.5
2.0
dB
dB
Pass band (relative to αmin
)
314.725 ... 315.275MHz
—
0.9
3.0
dB
Filter bandwidth
αrel≤ 3 dB
0.69
0.76
0.83
MHz
Relative attenuation (relative to αmin
)
10.00 ... 294.50 MHz
294.50 ... 304.50 MHz
304.50 ... 312.80 MHz
312.80 ... 313.20 MHz
313.20 ... 314.30 MHz
316.00 ... 323.00 MHz
323.00 ... 335.00 MHz
335.00 ... 600.00 MHz
600.00 ... 1000.00 MHz
1000.00 ... 2500.00 MHz
αrel
47
42
21
33
6
10
34
43
60
43
51
46
28
40
9
14
40
48
70
48
—
—
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
Impedance for pass band matching1)
Input: ZIN = RIN || CIN
—
—
410 || 2.6
410 || 2.6
—
—
Ω || pF
Ω || pF
Output: ZOUT = ROUT || COUT
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.
Maximum ratings
Operable temperature range T
Storage temperature range Tstg
–45/+125 ˚C
–45/+125 ˚C
DC voltage
VDC
PS
6
V
Source power
10
dBm
source impedance 50 Ω
Please read cautions and warnings and
important notes at the end of this document.
3
April 16, 2007
SAW Components
SAW filter
B3781
315.00 MHz
Data sheet
Matching network to 50 Ω (element values depend on pcb layout and equivalent circuit)
Cp1 = 1.5 pF
Ls2
Ls3
=
=
68 nH
68 nH
Cp4 = 1.5 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 QCC8B 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.
Please read cautions and warnings and
important notes at the end of this document.
4
April 16, 2007
SAW Components
SAW filter
B3781
315.00 MHz
Data sheet
ESD protection of SAW filters
SAW filters are Electro Static Discharge sensitive devices. To reduce the probability of damages
caused by ESD, special matching topologies have to be applied.
In general, “ESD matching” has to be ensured at that filter port, where electrostatic discharge is
expected.
Electrostatic discharges predominantly appear at the antenna input of RF receivers. Therefore
only the input matching of the SAW filter has to be designed to short circuit or to block the ESD
pulse.
Below two figures show recommended “ESD matching” topologies.
Depending on the input impedance of the SAW filter and the source impedance, the needed
component values have to be determined from case to case.
Ls3
Ls3
to output
matching
to output
matching
Dp1
Lp2
Lp2
Fig. 1 MLC varistor plus ESD matching
Fig. 2 Suppressor diode plus ESD matching
In cases where minor ESD occur, following simplified “ESD matching” topologies can be used
alternatively.
Cs1
Ls2
to output
matching
to output
matching
Lp1
Lp2
Fig. 3 shunt L – series L matching
Fig. 4 series C – shunt L matching
Effectiveness of the applied ESD protection has to be checked according to relevant industry
standards or customer specific requirements.
For further information, please refer to EPCOS Application report:
“ESD protection for SAW filters”. This report can be found under www.epcos.com/rke. Click on
“data sheets” and then “Applications” under category “Further information”.
Please read cautions and warnings and
important notes at the end of this document.
5
April 16, 2007
SAW Components
SAW filter
B3781
315.00 MHz
Data sheet
Transfer function
Transfer function (wideband)
Please read cautions and warnings and
important notes at the end of this document.
6
April 16, 2007
Important notes
Transfer function (ultimate rejection)
7
April 16, 2007
SAW Components
SAW filter
B3781
315.00 MHz
Data sheet
References
Type
B3781
Ordering code
Marking and package
Packaging
B39321B3781Z810
C61157-A7-A46
F61074-V8167-Z000
L_1126
Date codes
B3781_SB.s2p
B3781_WB.s2p
S-parameters
Soldering profile
RoHS compatible
S_6001
defined as compatible with the following documents:
"DIRECTIVE 2002/95/EC OF THE EUROPEAN PARLIAMENT
AND OF THE COUNCIL of 27 January 2003 on the restriction
of the use of certain hazardous substances in electrical and
electronic equipment. 2005/618/EC from April 18th, 2005,
amending Directive 2002/95/EC of the European Parliament
and of the Council for the purposes of establishing the maxi-
mum concentration values for certain hazardous substances in
electrical and electronic equipment."
For further information please contact your local EPCOS sales office or visit our webpage at
www.epcos.com .
Published by EPCOS AG
Surface Acoustic Wave Components Division
P.O. Box 80 17 09, 81617 Munich, GERMANY
EPCOS AG 2007. This brochure replaces the previous edition.
For questions on technology, prices and delivery please contact the Sales Offices of EPCOS AG or
the international Representatives.
Due to technical requirements components may contain dangerous substances. For information on
the type in question please also contact one of our Sales Offices.
Please read cautions and warnings and
important notes at the end of this document.
8
April 16, 2007
Important notes
The following applies to all products named in this publication:
1. Some parts of this publication contain statements about the suitability of our products for
certain areas of application. These statements are based on our knowledge of typical
requirements that are often placed on our products in the areas of application concerned. We
nevertheless expressly point out that such statements cannot be regarded as binding
statements about the suitability of our products for a particular customer application.
As a rule, EPCOS is either unfamiliar with individual customer applications or less familiar
with them than the customers themselves. For these reasons, it is always ultimately incum-
bent on the customer to check and decide whether an EPCOS product with the properties
described in the product specification is suitable for use in a particular customer application.
2. We also point out that in individual cases, a malfunction of passive electronic compo-
nents or failure before the end of their usual service life cannot be completely ruled
out in the current state of the art, even if they are operated as specified. In customer
applications requiring a very high level of operational safety and especially in customer appli-
cations in which the malfunction or failure of a passive electronic component could endanger
human life or health (e.g. in accident prevention or life-saving systems), it must therefore be
ensured by means of suitable design of the customer application or other action taken by the
customer (e.g. installation of protective circuitry or redundancy) that no injury or damage is
sustained by third parties in the event of malfunction or failure of a passive electronic compo-
nent.
3. The warnings, cautions and product-specific notes must be observed.
4. In order to satisfy certain technical requirements, some of the products described in this
publication may contain substances subject to restrictions in certain jurisdictions (e.g.
because they are classed as “hazardous”). Useful information on this will be found in our
Material Data Sheets on the Internet (www.epcos.com/material). Should you have any more
detailed questions, please contact our sales offices.
5. We constantly strive to improve our products. Consequently, the products described in this
publication may change from time to time. The same is true of the corresponding product
specifications. Please check therefore to what extent product descriptions and specifications
contained in this publication are still applicable before or when you place an order.
We also reserve the right to discontinue production and delivery of products. Conse-
quently, we cannot guarantee that all products named in this publication will always be avail-
able.
6. Unless otherwise agreed in individual contracts, all orders are subject to the current ver-
sion of the “General Terms of Delivery for Products and Services in the Electrical
Industry” published by the German Electrical and Electronics Industry Association
(ZVEI).
7. The trade names EPCOS, CeraDiode, CSSP, PhaseCap, PhaseMod, SIFI, SIKOREL, Silver-
Cap, SIMID, SIOV, SIP5D, SIP5K, TOPcap, UltraCap, WindCap are trademarks registered
or pending in Europe and in other countries. Further information will be found on the Internet
at www.epcos.com/trademarks.
9
April 16, 2007
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1-PORT SAW RESONATOR, 315MHz, ROHS COMPLIANT, HERMETIC SEALED, CERAMIC, DCC6E, SMD, 6 PIN
EPCOS
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