SKYWORKS CX20524 User Manual

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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)

Features

• Supports multi-slot GPRS up to Class 12

• Σ∆ Analog-to-Digital Converters (ADCs) for digitization of

baseband receive signal

• Receive path PGA for AGC of received signal

• GMSK Digital Modulator

• Digital-to-Analog Converters (DACs) for analog conversion of

the GMSK modulator output

• Transmit power ramping and power level control

• Low noise voiceband ADC for direct interface to handset and

headset microphone

• Low noise voiceband DAC for direct interface to handset and
headset speaker

• Auxiliary 8-bit ADC for monitoring system signals

• 3 V/1.8 V SIM card interface

• Temperature sensor

• High speed asynchronous serial ports for interface to

Skyworks Baseband Processor device

• Low speed asynchronous serial port for power management
functions

• Voltage regulators for both internal (fixed voltage) and
system (programmable voltage) needs

• Low power operation

• Control circuit for multi-chemistry advanced battery charger

• Power-On Reset (POR) generation

• Over current-limiting

• Power On/Off control inputs

• CX20524-12: 160-pin FPBGA 12 mm x 12 mm package

• CX20524-13: 180-pin FPBGA 10 mm x 10 mm package

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.

In the receive path, the MSD digitizes the baseband In­Phase/Quadrature (I/Q) inputs. Digital samples are then sent to
the Baseband Processor (BP) via the Rx serial interface. The
receive path features a programmable gain amplifier (PGA) for
Automatic Gain Control (AGC) of the receive signal.

In the transmit path, bursts of digital data are input to the MSD
over the control port. A Gaussian Minimum-Shift Keying
(GMSK) modulator generates modulated I and Q waveforms
from the input data. The I and Q waveforms are converted into
analog waveforms and output from the MSD.

The CX20524 generates an analog signal to control the
handset Power Amplifier (PA) output level.

The device voiceband Codec section provides an interface to a
32 Ω handset speaker and microphone. Line In/Out signals are
also available to interface with audio accessories, such as a
headset or car kit.

The MSD is designed to operate directly from a single cell,

3.6 V Li Ion battery with no external regulation required. The
MSD integrates all necessary Low Drop Out (LDO) voltage
regulators that generate the required device and system power
supplies from battery input.

An integrated SIM interface circuit allows direct interface to 3.0
V and 1.8 V SIM cards with no external components.

An integrated battery charger control circuit provides charging
capabilities for multi-chemistry batteries.

The CX20524-12 is packaged in a compact, 160-pin (12 mm x
12 mm) Fine Pitch Ball Grid Array (FPBGA), shown in Figure 2.

The CX20524-13 is packaged in a compact, 180 pin 10 mm x
10 mm, 0.5 mm pitch, Fine Pitch Ball Grid Array (FPBGA),
shown in Figure 3.

103177A • Skyworks Proprietary and Confidential information. • Products and product information are subject to change without notice. • April 2, 2004 1

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com

CX20524 Mixed Signal Device Product Summary

PAC

VCHARGE

VRF

PAC

VBATTERY

VSIM

SIM

VCORE

VIO

RX

Interface

Control

Interface

Voiceband

Interface

CX805
CX815

Memory

User Interface
CD, Keypad,
etcetera

Data Ports

CX20524 Application

CX77304/6

CX74063

Microphone

Speaker

Tx

Control

CX20524

Rx

Figure 1. Typical CX20524 Application in a Handset Design

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com

2

April 2, 2004 • Skyworks Proprietary and Confidential information. • Products and product information are subject to change without notice. • 103177A