EPCOS B3750 Low-loss filter Datasheet

SAW Components
Data Sheet B3750
SAW Components
B3750
Low-loss Filter
433,92 MHz
Data Sheet
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
5
6
4,8
Input Ground
Input
Output
Output Ground
Case - Ground
3,7
to be grounded
Type
Ordering code
B3750
B39431-B3750-U310
Marking and package
according to
C61157-A7-A56
Packing
according to
F61074-V8070-Z000
Electrostactic Sensitive Device (ESD)
Maximum ratings
Operable temperature range TA
Storage temperature range
DC voltage
Source power
Tstg
VDC
PS
–45/+120
˚C
–45/+120
6
10
˚C
V
dBm
2
source impedance 50 Ω
Mar 13, 2003
SAW Components
B3750
Low-loss Filter
433,92 MHz
Data Sheet
Characteristics
TA = –40 ... +95˚C
ZS = 50 Ω and matching network
ZL = 50 Ω and matching network
Reference temperature:
Terminating source impedance:
Terminating load impedance:
min.
typ.
max.
—
433,92
—
MHz
Minimum insertion attenuation
αmin
(including losses in matching network)
433,76 ... 434,08 MHz
—
2,0
3,0
dB
Pass band (relative to αmin)
433,76 ... 434,08 MHz
433,74 ... 434,10 MHz
433,70 ... 434,14 MHz
—
—
—
0,5
0,7
1,0
2,0
3,0
6,0
dB
dB
dB
0,64
0,70
0,76
MHz
MHz
MHz
MHz
MHz
MHz
55
48
31
39
8
62
55
35
44
11
—
—
—
—
—
dB
dB
dB
dB
dB
MHz
MHz
MHz
MHz
MHz
10
36
55
40
60
14
44
60
45
70
—
—
—
—
—
dB
dB
dB
dB
dB
—
310 || 2,2
310 || 2,2
—
Ω || pF
—
Ω || pF
fC
Center frequency
(center frequency between 3 dB points)
Pass bandwidth
αrel≤ 3 dB
Relative attenuation (relative to αmin)
10,00 ... 414,00
414,00 ... 424,50
424,50 ... 431,72
431,72 ... 432,12
432,12 ... 433,10
434,92
442,00
550,00
700,00
805,00
... 442,00
... 550,00
... 700,00
... 805,00
...1000,00
αrel
Impedance for pass band matching 2)
Input: ZIN = RIN || CIN
Output: ZOUT = ROUT || COUT
—
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 impedance into the input matching / output matching 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.
3
Mar 13, 2003
SAW Components
B3750
Low-loss Filter
433,92 MHz
Data Sheet
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 13, 2003
SAW Components
B3750
Low-loss Filter
433,92 MHz
Data Sheet
Frequency response
Frequency response (wideband)
5
Mar 13, 2003
SAW Components
B3750
Low-loss Filter
433,92 MHz
Data Sheet
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 brochure 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 considered 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 13, 2003
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