CX20524
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.
Key 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 interface to handset and from the input data. The I and Q waveforms are converted into headset speaker analog waveforms and output from the MSD.
- 3 V/1.8 V SIM card interface handset Power Amplifier (PA) output level.
- Temperature sensor The device voiceband Codec section provides an interface to a
