B39431-B3757-U310 [EPCOS]
SAW Components Low-loss Filter 434,42 MHz; 声表面波元件低损耗滤波器434,42兆赫
| 型号： | B39431-B3757-U310 |
| 厂家： | 
EPCOS |
| 描述： | SAW Components Low-loss Filter 434,42 MHz |
| 文件： | 总6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
Data Sheet B3757
SAW Components
Low-loss Filter
Data Sheet
B3757
434,42 MHz
Ceramic package QCC8C
Features
■ RF low-loss filter for remote control receivers
■ Package for Surface Mounted Technology
(SMT)
■ Balanced and unbalanced operation possible
■ Passivation layer: Protec
Terminals
■ Ni, gold plated
typ. dimensions in mm, approx. weight 0,1 g
Pin configuration
1
2
Input Ground
Input
5
Output
6
4,8
Output Ground
Case - Ground
3,7
to be grounded
Type
B3757
Ordering code
Marking and package
according to
Packing
according to
B39431-B3757-U310
C61157-A7-A56
F61074-V8070-Z000
Electrostactic Sensitive Device (ESD)
Maximum ratings
Operable temperature range TA
Storage temperature range Tstg
–45/+120
˚C
˚C
–45/+120
DC voltage
VDC
PS
6
V
Source power
10
dBm
source impedance 50 Ω
2
Mar 20, 2003
SAW Components
Low-loss Filter
Data Sheet
B3757
434,42 MHz
Characteristics
Reference temperature:
TA = –40 ... +95˚C
Terminating source impedance:
Terminating load impedance:
ZS = 50 Ω and matching network
ZL = 50 Ω and matching network
min.
typ.
max.
fC
—
434,42
—
MHz
dB
Center frequency
(center frequency between 3 dB points)
Minimum insertion attenuation
αmin
(including losses in matching network)
434,26 ... 434,58 MHz
—
2,0
3,0
Pass band (relative to αmin
)
434,26 ... 434,58 MHz
434,24 ... 434,60 MHz
434,20 ... 434,64 MHz
—
—
—
0,5
0,7
1,0
2,0
3,0
6,0
dB
dB
dB
Pass bandwidth
αrel≤ 3 dB
0,64
0,70
0,76
MHz
Relative attenuation (relative to αmin
)
αrel
10,00 ... 414,50 MHz
414,50 ... 425,00 MHz
425,00 ... 432,22 MHz
432,22 ... 432,62 MHz
432,62 ... 433,60 MHz
55
48
31
39
8
62
55
35
44
11
—
—
—
—
—
dB
dB
dB
dB
dB
435,42 ... 442,50 MHz
442,50 ... 550,00 MHz
550,00 ... 700,00 MHz
700,00 ... 805,00 MHz
805,00 ...1000,00 MHz
10
36
55
40
60
14
44
60
45
70
—
—
—
—
—
dB
dB
dB
dB
dB
Impedance for pass band matching 2)
Input: ZIN = RIN || CIN
Output: ZOUT = ROUT || COUT
—
—
310 || 2,2
310 || 2,2
—
—
Ω || pF
Ω || pF
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.
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Mar 20, 2003
SAW Components
Low-loss Filter
Data Sheet
B3757
434,42 MHz
Matching network to 50 Ω (element values depend on pcb layout and equivalent circuit)
Ls1 = 39 nH
Ls2 = 39 nH
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
Mar 20, 2003
SAW Components
Low-loss Filter
Data Sheet
B3757
434,42 MHz
Frequency response
Frequency response (wideband)
5
Mar 20, 2003
SAW Components
Low-loss Filter
Data Sheet
B3757
434,42 MHz
Frequency response (ultimate rejection)
Published by EPCOS AG
Surface Acoustic Wave Components Division, SAW CE AE PD
P.O. Box 80 17 09, D-81617 München
EPCOS AG 2003. All Rights Reserved. Reproduction, publication and dissemination of this bro-
chure and the information contained therein without EPCOS’ prior express consent is prohibited.
The information contained in this brochure describes the type of component and shall not be con-
sidered as guaranteed characteristics. Purchase orders are subject to the General Conditions for
the Supply of Products and Services of the Electrical and Electronics Industry recommended by the
ZVEI (German Electrical and Electronic Manufacturers’ Association), unless otherwise agreed.
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.
6
Mar 20, 2003
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