Philips Semiconductors
Objective specification
Baseband and audio interface for GSM
CONTENTS
1
2
3
4
5
6
7
8
8.1
8.2
9
9.1
9.2
9.3
10
10.1
10.2
10.3
11
11.1
11.2
11.3
11.4
12
12.1
12.2
12.3
13
13.1
13.2
13.3
13.4
FEATURES
APPLICATIONS
GENERAL DESCRIPTION
ORDERING INFORMATION
QUICK REFERENCE DATA
BLOCK DIAGRAM
PINNING
FUNCTIONAL DESCRIPTION
General
Baseband and voice band reference voltages
BASEBAND CODEC
Baseband transmit path
Baseband receive path
Baseband Serial Interface (BSI)
VOICE BAND CODEC
Voice band receive path
Voice band transmit path
Voice band digital circuitry
AUXILIARY FUNCTIONS
Automatic Gain Control (AGC): AUXDAC1
Automatic Frequency Control (AFC):
AUXDAC2
Power ramping: AUXDAC3
Auxiliary analog-to-digital converter (AUXADC)
CONTROL SERIAL INTERFACE (CSI)
The serial interface
Control Serial Interface (CSI) timing
characteristics
Control register block
VOICE BAND SIGNAL PROCESSOR (VSP)
Hardware description
VSP assembler language
Descriptions of the VSP instruction set
The assembler/emulator
14
15
16
17
18
18.1
18.2
18.3
18.4
18.5
18.6
LIMITING VALUES
PCF50732
THERMAL CHARACTERISTICS
DC CHARACTERISTICS
AC CHARACTERISTICS
FUNCTIONAL CHARACTERISTICS
Baseband transmit (BSI to TXI/Q)
Baseband receive (RXI/Q to BSI)
Voice band transmit (microphone to ASI)
Voice band receive (ASI to earphone)
Auxiliary digital-to-analog converters
Auxiliary analog-to-digital converters:
AUXADC1, AUXADC2, AUXADC3 and
AUXADC4
Typical total current consumption
Typical output loads
APPLICATION INFORMATION
Wake-up procedure from Sleep mode
Microphone input connection and test set-up
PACKAGE OUTLINES
SOLDERING
Introduction to soldering surface mount
packages
Reflow soldering
Wave soldering
Manual soldering
Suitability of surface mount IC packages for
wave and reflow soldering methods
DEFINITIONS
LIFE SUPPORT APPLICATIONS
18.7
18.8
19
19.1
19.2
20
21
21.1
21.2
21.3
21.4
21.5
22
23
1999 May 03
2
Philips Semiconductors
Objective specification
Baseband and audio interface for GSM
1
FEATURES
PCF50732
•
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.
2
APPLICATIONS
•
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.
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.
3
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
4
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
NAME
PCF50732H
LQFP48
DESCRIPTION
plastic low profile quad flat package; 48 leads; body 7
×
7
×
1.4 mm
VERSION
SOT313-2
1999 May 03
3
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