PCF50732 datasheet(3/64 Pages) PHILIPS

3 / 64 page

1999 May 03

Philips Semiconductors

Objective speciﬁcation

Baseband and audio interface for GSM

PCF50732

FEATURES

• Low power and low voltage device in 0.25 micron

CMOS technology; supply voltage: analog 2.7 V

(typical) and digital 1.5 V (typical)

• Compatible with GSM phase 2 and DCS1800

recommendations

• Complete in-phase and quadrature component interface

paths between the Digital Signal Processor (DSP) and

RF circuitry

• Complete linear PCM CODEC for audio signal

conversion between earphone/microphone and DSP

• Four auxiliary analog inputs for measurement purposes

(e.g. battery monitoring)

• Three auxiliary analog outputs for control purposes

(i.e. AFC, AGC and power ramping control)

• Separate baseband, audio and control serial interfaces

• Voice band Signal Processor (VSP) for flexible audio

data processing.

APPLICATIONS

The CMOS integrated circuit PCF50732, Baseband and

audio interface for GSM, is dedicated to wireless

telephone handsets conforming to the GSM

recommendations phases 1 and 2, DCS1800 and

PCS1900.

GENERAL DESCRIPTION

The baseband CODEC 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

transmit (TX) and receive (RX) paths.

The voice band CODEC 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 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) 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.

ORDERING INFORMATION

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCF50732H

LQFP48

plastic low proﬁle quad ﬂat package; 48 leads; body 7

× 7 × 1.4 mm

SOT313-2

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