PCF50732

The baseband CODEC PCF50732 is a complete interface circuit between the RF part in a mobile communication handset and the Digital Signal Processor (DSP). It consists of three parts:
· The receive path, which transforms the quadrature signals from the RF (I/Q) to digital signals
· The transmit path, which transforms a bitstream to analog quadrature signals for the RF devices
· The digital Baseband Serial Interface (BSI), which exchanges baseband data between the PCF50732 and the digital signal processor. The interface also includes signals to power-up and power-down the baseband ransmit (TX) and receive (RX) paths.

The voice band CODEC PCF50732 is a complete analog front-end circuit. It consists of four parts:
· The receive path, which converts a digital signal to an analog signal for an earpiece, an external loudspeaker or a buzzer
· The transmit path, which receives the analog external signal from a microphone and converts it into a digital signal
· The Voice band Signal Processor (VSP), which filters the voice band data
· The digital Audio Serial Interface (ASI), which connects the digital linear PCM signals of the receive and transmit paths to an external DSP. The voice band data is coded in 16-bit linear PCM twos complement words.

The auxiliary Analog-to-Digital Converter (ADC) section of PCF50732 consists of four input channels specified for battery management applications. The auxiliary Digital-to-Analog Converter (DAC) section consists of three DACs for Automatic Gain Control (AGC), for Automatic Frequency Control (AFC) and for power ramping.

The Control Serial Interface (CSI) PCF50732 is used to program a set of control registers, to store the power amplifier ramping characteristics into the dedicated RAM and to transmit auxiliary ADC values to the DSP. It also controls switches, modes and power status of the different parts of the IC.