SI4209 Datasheet | Silicon Labs

Description The Si4209 transceiver is a plete RF front end for dual-band GSM and GPRS wireless munications. The receive section interfaces between the RF band-select SAW filters and the baseband subsystem. The Si4209 receiver leverages a proven digital low-IF architecture and enables a universal baseband interface without the need for plex dc offset pensation. The transmit section of Si4209 provides a plete upconversion path from the baseband subsystem to the power amplifier (PA) using an offset phase-locked loop (OPLL) integrated with Silicon Laboratories’ patented synthesizer technology. All sensitive ponents, such as TX/RF VCOs, loop filters, tuning inductors, and varactors are pletely integrated into a single integrated circuit. The Si4209 transceiver includes a digitally-controlled crystal oscillator (DCXO) and pletely integrates the reference oscillator and varactor functionality. Features 5x5 mm 25-pin QFN Smallest solution footprint Highest integration Industry-leading performance Integrated GSM/GPRS transceiver including the following: - Digital low-IF receiver - plete support for 900/1800, 900/1900, 850/1800, 850/1900 band configurations - Region management flexibility - Offset PLL transmitter - Integrated TX VCO, loop filter, and varactor - Frequency synthesizer - Integrated RF VCO, loop filter, and varactor - Digitally-controlled crystal oscillator (DCXO) - Universal analog baseband interface - Quad-band support: - GSM 850 Class 4, small MS - E-GSM 900 Class 4, small MS - DCS 1800 Class 1 - PCS 1900 Class 1 - GPRS class 12 pliant - 3-wire serial control interface - 2.7 to 3.0 V operation . - CMOS process technology - Lead-free/Ro HS-pliant Data Shee Applications - Dual-band GSM/GPRS digital cellular handsets - Dual-band GSM/GPRS wireless data modems ANTENNA SWITCH 900 1800 1900 850 900 1800 1900 DIGITAL FILTER RFIL I ADC Q ADC LOW-IF φ DET RFIH LNA 0 /...