saw components data sheet B3570
2 dec 15, 1999 saw components B3570 868,30 mhz low-loss filter data sheet features n rf low-loss filter for remote control receivers n package for s urface m ounted t echnology ( smt ) terminals n ni, gold plated pin configuration 1 input 2,7 input ground 5 output 3,6 output ground 4,8 case - ground e lectrostactic s ensitive d evice ( esd ) type ordering code marking and package according to packing according to B3570 b39871-B3570-u310 c61157-a7-a56 f61074-v8070-z000 maximum ratings operable temperature range t a C45/+90 ?c storage temperature range t stg C45/+90 ?c dc voltage v dc 0v source power p s 0 dbm source impedance 50 w typ. dimensions in mm, approx. weight 0,1 g ceramic package qcc8c
3 dec 15, 1999 saw components B3570 868,30 mhz low-loss filter data sheet characteristics reference temperature: t a = 25 ?c terminating source impedance: z s = 50 w and matching network terminating load impedance: z l = 50 w and matching network 1) temperature dependence of f c : f c ( t a ) = f c ( t 0 ) (1 + tc f ( t a C t 0 ) 2 ) min. typ. max. center frequency f c 868,39 mhz (center frequency between 3 db points) minimum insertion attenuation a min 868,00 ... 868,78 mhz 2,7 4,2 db pass band (relative to a min ) 868,00 ... 868,78 mhz 1,0 3,0 db 867,90 ... 868,88 mhz 1,5 6,0 db relative attenuation (relative to a min ) a rel 10,00 ... 700,00 mhz 50 55 db 700,00 ... 830,00 mhz 35 45 db 830,00 ... 850,00 mhz 32 40 db 850,00 ... 865,20 mhz 25 30 db 871,00 ... 874,50 mhz 11 16 db 874,50 ... 883,00 mhz 22 27 db 883,00 ... 900,00 mhz 30 35 db 900,00 ...1000,00 mhz 35 40 db impedance for pass band matching input: z in = r in || c in 216 || 2,20 w || pf output: z out = r out || c out 222 || 2,20 w || pf temperature coefficient of frequency 1) tc f C0,03 ppm/k 2 frequency inversion point t 0 15 35 c
4 dec 15, 1999 saw components B3570 868,30 mhz low-loss filter data sheet characteristics reference temperature: t a = C45 ... 90 ?c terminating source impedance: z s = 50 w and matching network terminating load impedance: z l = 50 w and matching network min. typ. max. center frequency f c 868,30 mhz (center frequency between 3 db points) minimum insertion attenuation a min 868,00 ... 868,78 mhz 2,7 4,7 db pass band (relative to a min ) 868,00 ... 868,60 mhz 1,0 3,0 db 867,90 ... 868,70 mhz 1,5 6,0 db relative attenuation (relative to a min ) a rel 10,00 ... 700,00 mhz 50 55 db 700,00 ... 830,00 mhz 35 45 db 830,00 ... 850,00 mhz 32 40 db 850,00 ... 865,02 mhz 25 30 db 871,00 ... 874,50 mhz 11 16 db 874,50 ... 883,00 mhz 22 27 db 883,00 ... 900,00 mhz 30 35 db 900,00 ...1000,00 mhz 35 40 db impedance for pass band matching input: z in = r in || c in 216 || 2,20 w || pf output: z out = r out || c out 222 || 2,20 w || pf
5 dec 15, 1999 saw components B3570 868,30 mhz low-loss filter data sheet matching network to 50 w (element values depend on pcb layout and equivalent circuit ) c p1 = 3,3 pf l s2 = 12 nh l s3 = 12 nh c p4 = 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.
6 dec 15, 1999 saw components B3570 868,30 mhz low-loss filter data sheet normalized frequency response normalized frequency response (wideband)
7 dec 15, 1999 saw components B3570 868,30 mhz low-loss filter data sheet published by epcos ag surface acoustic wave components division, ofw e ue p.o. box 80 17 09, d-81617 mnchen ? epcos ag 1999. all rights reserved. a s far as patents or other rights of third parties are concerned, liability is only assumed for compo- nents per se, not for applications, processes and circuits implemented within components or assemblies. t he information describes the type of component and shall not be considered as assured characteristics. t erms of delivery and rights to change design reserved. for questions on technology, prices and delivery please contact the sales offices of epcos ag or 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.
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