TFS400B

tfs400b.doc version 1.1 17.03.2000 _____________________________________________________________________________________________________ VI TELEFILTER SAW Filter Specification TFS 400 B 1/5 _____________________________________________________________________________________________________ Application The filter is suitable for GSM, DCS 1800 and dual band receivers. It can especially be used in the first IF in which full channel selectivity is not necessary. Due to the high frequency the filter is small, thus it saves cost and space on the printed circuit board. As it has symmetrical input and output it does not need any transformation networks in state of the art IC transceiver concepts in which symmetrical inputs and outputs are favourable. Measurement condition Ambient temperature: 23 °C Input power level: 10 dBm Terminating impedances for input: 580 ohms || -0.72 for output: 580 ohms || -0.72 ext.coil: 47 nH www.DataSheet4U.com Characteristics Remark: Reference level for the relative attenuation arel of the TFS 400 B is the minimum of the pass band attenuation amin. The minimum of the pass band attenuation amin is defined as the insertion loss ae. The centre frequency fo is the arithmetic mean value of the upper and lower frequencies at the 3 dB filter attenuation level relative to the insertion loss ae. The nominal frequency fN is fixed on 400 MHz without tolerance. The given values for the relative attenuation arel and for the group delay ripple have to be reached a...