B3780

B3780 EPCOS | Alldatasheet

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Technical content

2 Dec 22, 2004

433,92 MHzLow-loss Filter Data Sheet

Features

■ RF low-loss filter for remote control receivers ■ Package for Surface M ounted Technology (SMT ) ■ Balanced and unbalanced operation possible ■ Passivation layer: Elpas ■ AEC-Q200 qualified component family Terminals ■ Ni, gold plated Pin configuration1)

1 Input Ground (recommended) or Input

2 Input (recommended) or Input Ground

5 Output (recommended) or Output Ground

6 Output Ground (recommended) or Output

4,8 Case - Ground 3,7 to be grounded ElectrostacticSensitiveD evice (ESD ) Type Ordering code Marking and package according to Packing according to B3780 B39431-B3780-Z810 C61157-A7-A46 F61074-V8167-Z000 Maximum ratings Operable temperature range TA –45/+120 ˚C Storage temperature rangeTstg –45/+120 ˚C DC voltage VDC 6V Source power PS 10 dBm source impedance 50 Ω typ. dimensions in mm, approx. weight 0,07 g Ceramic package QCC8B 1)The recommended pin configuration usually offers best suppression of electrical crosstalk.The filter characteristics refer to this configuration.

3 Dec 22, 2004

433,92 MHzLow-loss Filter Data Sheet Characteristics Reference temperature: TA = –40 ... +85˚C Terminating source impedance: ZS = 50Ω and matching network Terminating load impedance: ZL = 50Ω and matching network 1)Power matching of the SAW filter requires a certain source and load impedance. This character- istic impedance is provided by the 50 Ohm environment and a wideband matching network at input and output. After removing the SAW filter, the conjugate complex impedance values of the input and output matching network including the 50 Ohm environment are calculated. For more details, we refer to EPCOS application note #4. min. typ. max. Center frequency fC — 433,92 — MHz (center frequency between 3 dB points) Minimum insertion attenuation α min including loss in matching elements — 2,0 2,8 dB excluding loss in matching elements — 1,6 2,4 dB Pass band (relative toα min) 433,645 ... 434,195MHz — 0,9 3,0 dB Filter bandwidth α rel≤ 3 dB 780 850 920 kHz Relative attenuation(relative toα min) α rel 10,00 ... 414,00 MHz 48 53 — dB 414,00 ... 425,00 MHz 42 47 — dB 425,00 ... 431,50 MHz 28 33 — dB 431,50 ... 433,00 MHz 18 21 — dB 434,92 ... 443,00 MHz 14 18 — dB 443,00 ... 530,00 MHz 36 41 — dB 530,00 ... 670,00 MHz 55 60 — dB 670,00 ... 830,00 MHz 45 50 — dB 830,00 ...1000,00 MHz 60 65 — dB 1000,00 ...2500,00 MHz 43 48 — dB Impedance for pass band matching Input: ZIN = R IN ||C IN — 330 || 1,9 — Ω || pF Output:ZOUT = R OUT ||C OUT — 330 || 1,9 — Ω || pF

4 Dec 22, 2004

433,92 MHzLow-loss Filter Data Sheet Matching network to 50Ω (element values depend on pcb layout and equivalent circuit) C p1 = 1,5 pF Ls2 = 39 nH Ls3 = 39 nH C p4 = 1,5 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 QCC8B 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 Dec 22, 2004

433,92 MHzLow-loss Filter Data Sheet Frequency response Frequency response(wideband)

6 Dec 22, 2004

433,92 MHzLow-loss Filter Data Sheet Frequency response(ultimate rejection) 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.