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B3570 Dataheets PDF



Part Number B3570
Manufacturers EPCOS
Logo EPCOS
Description SAW Components Low-loss Filter
Datasheet B3570 DatasheetB3570 Datasheet (PDF)

SAW Components Data Sheet B3570 SAW Components Low-loss Filter Data Sheet B3570 868,30 MHz Ceramic package QCC8C Features s RF low-loss filter for remote control receivers s Package for Surface Mounted Technology (SMT) Terminals s Ni, gold plated typ. dimensions in mm, approx. weight 0,1 g Pin configuration 1 2,7 5 3,6 4,8 Input Input Ground Output Output Ground Case - Ground Type B3570 Ordering code B39871-B3570-U310 Marking and package according to C61157-A7-A56 Packing according to.

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SAW Components Data Sheet B3570 SAW Components Low-loss Filter Data Sheet B3570 868,30 MHz Ceramic package QCC8C Features s RF low-loss filter for remote control receivers s Package for Surface Mounted Technology (SMT) Terminals s Ni, gold plated typ. dimensions in mm, approx. weight 0,1 g Pin configuration 1 2,7 5 3,6 4,8 Input Input Ground Output Output Ground Case - Ground Type B3570 Ordering code B39871-B3570-U310 Marking and package according to C61157-A7-A56 Packing according to F61074-V8070-Z000 Electrostactic Sensitive Device (ESD) Maximum ratings Operable temperature range Storage temperature range DC voltage Source power TA Tstg VDC PS –45/+90 –45/+90 0 0 ˚C ˚C V dBm source impedance 50 Ω 2 May 09, 2001 SAW Components Low-loss Filter Data Sheet Characteristics Reference temperature: Terminating source impedance: Terminating load impedance: B3570 868,30 MHz TA = 25 ˚C ZS = 50 Ω and matching network ZL = 50 Ω and matching network min. typ. 868,39 max. — MHz Center frequency (center frequency between 3 dB points) fC — Minimum insertion attenuation αmin 868,00 ... 868,78 MHz Pass band (relative to αmin) 868,00 ... 868,78 MHz 867,90 ... 868,88 MHz Relative attenuation (relative to αmin) 10,00 ... 700,00 700,00 ... 830,00 830,00 ... 850,00 850,00 ... 865,20 871,00 ... 874,50 874,50 ... 883,00 883,00 ... 900,00 900,00 ...1000,00 αrel MHz MHz MHz MHz MHz MHz MHz MHz — 2,7 4,2 dB — — 1,0 1,5 3,0 6,0 dB dB 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 Temperature coefficient of frequency 1) Frequency inversion point 1)Temperature 2) — — 216 || 2,20 222 || 2,20 –0,03 — — — — 35 Ω || pF Ω || pF ppm/K2 °C TCf T0 — 15 dependence of fC: fC(TA) = fC(T0) (1 + TCf(TA – T0)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 May 09, 2001 SAW Components Low-loss Filter Data Sheet Characteristics Reference temperature: Terminating source impedance: Terminating load impedance: B3570 868,30 MHz TA = –45 ... 90 ˚C ZS = 50 Ω and matching network ZL = 50 Ω and matching network min. typ. 868,30 max. — MHz Center frequency (center frequency between 3 dB points) fC — Minimum insertion attenuation αmin 868,00 ... 868,78 MHz Pass band (relative to αmin) 868,00 ... 868,60 MHz 867,90 ... 868,70 MHz Relative attenuation (relative to αmin) 10,00 ... 700,00 700,00 ... 830,00 830,00 ... 850,00 850,00 ... 865,02 871,00 ... 874,50 874,50 ... 883,00 883,00 ... 900,00 900,00 ...1000,00 αrel MHz MHz MHz MHz MHz MHz MHz MHz — 2,7 4,7 dB — — 1,0 1,5 3,0 6,0 dB dB 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 2) — — 216 || 2,20 222 || 2,20 — — Ω || pF Ω || 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. 4 May 09, 2001 SAW Components Low-loss Filter Data Sheet 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 B3570 868,30 MHz 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 .


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