B3572 [EPCOS]
SAW Components Low-loss Filter 868,95 MHz; 声表面波元件低损耗滤波器868,95兆赫
| 型号： | B3572 |
| 厂家： | 
EPCOS |
| 描述： | SAW Components Low-loss Filter 868,95 MHz |
| 文件： | 总7页 (文件大小：76K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SAW Components
Data Sheet B3572
SAW Components
Low-loss Filter
Data Sheet
B3572
868,95 MHz
Ceramic package QCC8C
Features
■ RF low-loss filter for remote control receivers
■ Package for Surface Mounted Technology
(SMT)
Terminals
■ Ni, gold plated
typ. dimensions in mm, approx. weight 0,1 g
Pin configuration
1
Input
2,7
5
Input Ground
Output
3,6
4,8
Output Ground
Case - Ground
Type
B3572
Ordering code
Marking and package
according to
Packing
according to
B39871-B3572-U310
C61157-A7-A56
F61074-V8070-Z000
Electrostactic Sensitive Device (ESD)
Maximum ratings
Operable temperature range TA
Storage temperature range Tstg
–45/+105
˚C
˚C
–45/+105
DC voltage
VDC
PS
0
0
V
Source power
dBm
source impedance 50 Ω
2
Mar 10, 2004
SAW Components
Low-loss Filter
Data Sheet
B3572
868,95 MHz
Characteristics
Reference temperature:
TA = 25 ˚C
Terminating source impedance:
Terminating load impedance:
ZS = 50 Ω and matching network
ZL = 50 Ω and matching network
min.
typ.
max.
fC
—
869,04
—
MHz
dB
Center frequency
(center frequency between 3 dB points)
Minimum insertion attenuation
αmin
868,70 ... 869,38 MHz
—
2,7
4,2
Pass band (relative to αmin
)
868,70 ... 869,38 MHz
868,60 ... 869,48 MHz
—
—
1,0
1,5
3,0
6,0
dB
dB
Relative attenuation (relative to αmin
)
αrel
10,00 ... 700,00 MHz
700,00 ... 830,00 MHz
830,00 ... 850,60 MHz
850,60 ... 865,80 MHz
871,60 ... 875,10 MHz
875,10 ... 883,60 MHz
883,60 ... 900,00 MHz
900,00 ...1000,00 MHz
50
35
32
25
11
22
30
35
55
45
40
30
16
27
35
40
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
dB
Impedance for pass band matching
Input: ZIN = RIN || CIN
Output: ZOUT = ROUT || COUT
—
—
200 || 2,40
200 || 2,40
—
—
Ω || pF
Ω || pF
Temperature coefficient of frequency 1)
Frequency inversion point
TCf
T0
—
–0,03
—
—
ppm/K2
15
35
°C
1)Temperature dependence of fC: fC(TA) = fC(T0) (1 + TCf(TA – T0)2)
3
Mar 10, 2004
SAW Components
Low-loss Filter
Data Sheet
B3572
868,95 MHz
Characteristics
Reference temperature:
TA = –45 ... 90 ˚C
Terminating source impedance:
Terminating load impedance:
ZS = 50 Ω and matching network
ZL = 50 Ω and matching network
min.
typ.
max.
fC
—
868,95
—
MHz
dB
Center frequency
(center frequency between 3 dB points)
Minimum insertion attenuation
αmin
868,70 ... 869,20 MHz
—
2,7
4,7
Pass band (relative to αmin
)
868,70 ... 869,20 MHz
868,60 ... 869,30 MHz
—
—
1,0
1,5
3,0
6,0
dB
dB
Relative attenuation (relative to αmin
)
αrel
10,00 ... 700,00 MHz
700,00 ... 830,00 MHz
830,00 ... 850,60 MHz
850,60 ... 865,62 MHz
871,60 ... 875,10 MHz
875,10 ... 883,60 MHz
883,60 ... 900,00 MHz
900,00 ...1000,00 MHz
50
35
32
25
11
22
30
35
55
45
40
30
16
27
35
40
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
dB
Impedance for pass band matching 2)
Input: ZIN = RIN || CIN
Output: ZOUT = ROUT || COUT
—
—
200 || 2,40
200 || 2,40
—
—
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.
4
Mar 10, 2004
SAW Components
Low-loss Filter
Data Sheet
B3572
868,95 MHz
Matching network to 50 Ω (element values depend on pcb layout and equivalent circuit)
Cp1 = 3,3 pF
Ls2 = 12 nH
Ls3 = 12 nH
Cp4 = 3,3 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 QCC8C package, pinning 1,5 (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.
5
Mar 10, 2004
SAW Components
Low-loss Filter
Data Sheet
B3572
868,95 MHz
Normalized frequency response
Normalized frequency response (wideband)
6
Mar 10, 2004
SAW Components
Low-loss Filter
Data Sheet
B3572
868,95 MHz
Published by EPCOS AG
Surface Acoustic Wave Components Division, SAW CE AE PD
P.O. Box 80 17 09, D-81617 München
EPCOS AG 2004. 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.
7
Mar 10, 2004
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