AD7002中文資料LC2MOS GSM Baseband 1/O Port數(shù)據(jù)手冊ADI規(guī)格書

描述 Description

The AD7002 is a complete low power, two-channel, input/output port with signal conditioning. The device is used as abaseband digitization subsystem, performing signal conversionbetween the DSP and the IF/RF sections in the Pan-Europeantelephone system (GSM).The transmit path consists of an onboard digital modulator,containing all the code necessary for performing Gaussian MinimumShift Keying (GMSK), two high accuracy, fast DACs withoutput reconstruction filters. The receive path is composed oftwo high performance sigma-delta ADCs with digital filtering. Acommon bandgap reference feeds the ADCs and signal DACs.Three control DACs (AUX DAC1 to AUX DAC3) are includedfor such functions as AFC, AGC and carrier signal shaping.In addition, AUX FLAG may be used for routing digitalcontrol information through the device to the IF/RF sections.As it is a necessity for all GSM mobile systems to use the lowestpower possible, the device has power-down or sleep options forall sections (transmit, receive and auxiliary).The AD7002 is housed in 44-lead PQFP (Plastic Quad Flatpack).