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| SAW Components Data Sheet B3768 SAW Components Low-loss Filter Data Sheet B3768 313,85 MHz Ceramic package QCC8B Features s RF low-loss filter for remote control receivers s Package for Surface Mounted Technology (SMT) s Balanced and unbalanced operation possible s Passivation layer: Elpas s AEC-Q200 qualified component family Terminals s Ni, gold plated typ. dimensions in mm, approx. weight 0,07 g 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 Type B3768 Ordering code B39311-B3768-Z810 Marking and package according to C61157-A7-A46 Packing according to F61074-V8167-Z000 Electrostactic Sensitive Device (ESD) Maximum ratings Operable temperature range TA Storage temperature range Tstg VDC DC voltage Source power PS 1) The -45/+120 -45/+120 6 10 C C V dBm source impedance 50 recommended pin configuration usually offers best suppression of electrical crosstalk.The filter characteristics refer to this configuration. 2 Aug 11, 2004 SAW Components Low-loss Filter Data Sheet Characteristics Reference temperature: B3768 313,85 MHz TA = -45 ... +95C Terminating source impedance: Terminating load impedance: ZS = 50 and matching network ZL = 50 and matching network min. typ. 313,85 max. -- MHz Center frequency (center frequency between 3 dB points) Minimum insertion attenuation including loss in matching elements excluding loss in matching elements Pass band (relative to min) 313,70 ... 314,00 MHz 313,67 ... 314,03 MHz 313,63 ... 314,07 MHz Filter bandwidth rel 3 dB Relative attenuation (relative to min) 10,00 ... 293,35 293,35 ... 303,35 303,35 ... 311,65 311,65 ... 312,05 312,05 ... 313,15 314,55 321,85 335,00 600,00 ... 321,85 ... 335,00 ... 600,00 ...1000,00 fC -- min -- -- 1,9 1,3 2,9 2,3 dB dB -- -- -- 0,5 0,7 1,0 2,0 3,0 6,0 dB dB dB 0,54 rel 0,59 0,64 MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz 48 45 25 33 13 13 38 43 60 53 50 30 40 18 17 45 48 70 -- -- -- -- -- -- -- -- -- dB dB dB dB dB dB dB dB dB Impedance for pass band matching 1) Input: ZIN = RIN || CIN Output: ZOUT = ROUT || COUT 1) -- -- 340 || 2,6 340 || 2,6 -- -- || pF || pF 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 Aug 11, 2004 SAW Components Low-loss Filter Data Sheet Matching network to 50 (element values depend on pcb layout and equivalent circuit) B3768 313,85 MHz 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 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. 4 Aug 11, 2004 SAW Components Low-loss Filter Data Sheet Frequency response B3768 313,85 MHz Frequency response (wideband) 5 Aug 11, 2004 SAW Components Low-loss Filter Data Sheet Frequency response (ultimate rejection) B3768 313,85 MHz Published by EPCOS AG Surface Acoustic Wave Components Division, SAW CE AE PD P.O. Box 80 17 09, D-81617 Munchen (c) EPCOS AG 2004. 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 Aug 11, 2004 |
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