CX20524

www.DataSheet4U.com PRODUCT SUMMARY CX20524 Mixed Signal Device for GSM and GPRS Applications Applications GSM handsets and modules (850/900/1800/1900 MHz) GPRS handsets and modules (850/900/1800/1900 MHz) Description The CX20524 Mixed Signal Device (MSD) is a highly integrated device designed for use in multi-band Global System for Mobile communications (GSM) and General Packet Radio Service (GPRS) handsets. The MSD includes all the power management, voice-band, mixed signal, and radio control functions required in a GSM/GPRS handset and module. Features Supports multi-slot GPRS up to Class 12 Σ∆ Analog-to-Digital Converters (ADCs) for digitization of In the receive path, the MSD digitizes the baseband Inbaseband receive signal Phase/Quadrature (I/Q) inputs. Digital samples are then sent to Receive path PGA for AGC of received signal the Baseband Processor (BP) via the Rx serial interface. The GMSK Digital Modulator receive path features a programmable gain amplifier (PGA) for Digital-to-Analog Converters (DACs) for analog conversion of Automatic Gain Control (AGC) of the receive signal. the GMSK modulator output Transmit power ramping and power level control In the transmit path, bursts of digital data are input to the MSD Low noise voiceband ADC for direct interface to handset and over the control port. A Gaussian Minimum-Shift Keying headset microphone (GMSK) modulator generates modulated I and Q waveforms Low noise voiceband DAC for direct interf...