CX74063中文资料RF Transceiver With Power Ramping Controller and Integrated Crystal Oscillator With 13 MHz Output for Multi-Band GSM, GPRS and EDGE Applications数据手册Skyworks规格书

描述 Description

The CX74063 transceiver is a highly integrated device for multibandGlobal System for Mobile Communications (GSM) or GeneralPacket Radio Service (GPRS) applications. The device requires aminimal number of external components to complete a GSM radiosubsystem. The CX74063 supports GSM850, EGSM900,DCS1800, and PCS1900 applications. The receiver also supportsEnhanced Data for GSM Evolution (EDGE) downlink applications.

The receive path implements a direct down-conversionarchitecture that eliminates the need for Intermediate Frequency(IF) components. The CX74063 receiver consists of threeintegrated Low Noise Amplifiers (LNAs), a quadraturedemodulator, tunable receiver baseband filters, and a DC OffsetCorrection (DCOC) sequencer.

In the transmit path, the device consists of an In-phase andQuadrature (I/Q) modulator within a frequency translation loopdesigned to perform frequency up-conversion with high outputspectral purity. This loop also contains a phase-frequencydetector, charge pump, mixer, programmable dividers, and highpower transmit Voltage Controlled Oscillators (VCOs) with noexternal tank required. With the integrated gain controller (and anintegrator ), the device realizes the Power Amplifier Control (PAC)functionality when combined with a coupler, a Radio Frequency(RF) detector, and a Power Amplifier (PA).

The CX74063 also features an integrated, fully programmable,sigma-delta fractional-N synthesizer suitable for GPRS multi-slotoperation. Except for the loop filter, the frequency synthesizerfunction, including a wideband VCO, is completely on-chip. Thereference frequency for the synthesizer is supplied by theintegrated crystal oscillator circuitry.

The CX74063 is available as a 56-pin, RFLGA 8 x 8 mm packagewith either a circular ground pad or a four-quadrant ground pad.

特性 Features

• Direct down-conversion receiver eliminates the image reject/IF filters
• Three separate LNAs with single-ended inputs
• RF gain range: GSM = 20 dB, DCS/PCS = 22 dB. Baseband gain range = 100 dB
• Gain selectable in 2 dB steps
• Integrated receive baseband filters with tunable bandwidth