SAW Components
Data Sheet B3577
2Sep 09, 2005
SAW Components B3577
311,06 MHzLow-loss Filter
Data Sheet
Features
■RF low-loss filter for remote control receivers
■Package for Surface Mounted Technology
(SMT)
■Balanced and unbalanced operation possible
■Passivation layer: Protec
■AEC-Q200 qualified component family
■Compliant to EU RoHs Directive (2002/95/EC)
■Lead free soldering compatible with J - STD20C
Terminals
■Ni, gold plated
Pin configuration
1 Input Ground
2 Input
5 Output
6 Output Ground
4,8 Case - Ground
3,7 to be grounded
Electrostactic Sensitive Device (ESD)
Type Ordering code Marking and package
according to Packing
according to
B3577 B39311-B3577-U310 C61157-A7-A56 F61074-V8169-Z000
Maximum ratings
Operable temperature range
T
A–45/+120 ˚C
Storage temperature range
T
stg –45/+120 ˚C
DC voltage
V
DC 0V
Source power
P
S
10 dBm source impedance 50 Ω
typ. dimensions in mm, approx. weight 0,1 g
Ceramic package QCC8C
3Sep 09, 2005
SAW Components B3577
311,06 MHzLow-loss Filter
Data Sheet
Characteristics
Reference temperature:
T
A= -40 ... 95 ˚C
Terminating source impedance:
Z
S= 50 Ωand matching network
Terminating load impedance:
Z
L= 50 Ωand matching network
1)Temperature dependence of
f
C
:
f
C
(
T
A) =
f
C
(
T
0
) (1 +
TC
f(
T
A –
T
0
)2)
min. typ. max.
Center frequency
f
C
— 311,06 — MHz
(center frequency between 3 dB points)
Minimum insertion attenuation αmin
310,94 ... 311,18 MHz — 2,0 3,0 dB
Pass band (relative to αmin)
310,94 ... 311,18 MHz — 1,0 2,0 dB
310,91 ... 311,21 MHz — 2,0 3,0 dB
Relative attenuation (relative to αmin)αrel
10,00 ... 290,00 MHz 40 45 — dB
290,00 ... 306,00 MHz 35 40 — dB
306,00 ... 310,10 MHz 20 26 — dB
312,00 ... 313,50 MHz 15 21 — dB
320,00 ... 396,00 MHz 35 40 — dB
550,00 ...1000,00 MHz 45 60 — dB
Impedance for pass band matching
Input:
Z
IN =
R
IN ||
C
IN — 353 || 3,30 — Ω || pF
Output:
Z
OUT =
R
OUT ||
C
OUT —343 || 3,30 —Ω || pF
Temperature coefficient of frequency 1)
TC
f— –0,03 — ppm/K2
Frequency inversion point
T
0
10 — 30 °C
4Sep 09, 2005
SAW Components B3577
311,06 MHzLow-loss Filter
Data Sheet
Matching network to 50 Ω(element values depend on pcb layout and equivalent circuit)
Ls1 = 56 nH
Ls2 = 56 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.
5Sep 09, 2005
SAW Components B3577
311,06 MHzLow-loss Filter
Data Sheet
Normalized frequency response
Normalized frequency response (wideband)
6Sep 09, 2005
SAW Components B3577
311,06 MHzLow-loss Filter
Data Sheet
P
ublished by EPCOS AG
S
urface Acoustic Wave Components Division, SAW CE AE PD
P
.O. Box 80 17 09, D-81617 München
EPCOS AG 2005. All Rights Reserved. Reproduction, publication and dissemination of this bro-
c
hure and the information contained therein without EPCOS’ prior express consent is prohibited.
T
he information contained in this brochure describes the type of component and shall not be con
-
s
idered as guaranteed characteristics. Purchase orders are subject to the General Conditions fo
r
t
he Supply of Products and Services of the Electrical and Electronics Industry recommended by th
e
Z
VEI (German Electrical and Electronic Manufacturers’ Association), unless otherwise agreed.
T
his brochure replaces the previous edition.
For questions on technology, prices and delivery please contact the Sales Offices of EPCOS AG o
r
t
he international Representatives.
Due to technical requirements components may contain dangerous substances. For information on
t
he type in question please also contact one of our Sales Offices.
