CX20505 datasheet(1/4 Pages) ETC | Integrated Analog Device for GSM and GPRS Applications

1 page

103186A

Skyworks Solutions, Inc., Proprietary and Confidential

[781] 376-3000

fax [781] 376-3100sales@skyworksinc.comwww.skyworksinc.com

September 22, 2003

PRODUCT SUMMARY

CX20505-14 Integrated Analog Device for GSM and GPRS

Applications

APPLICATIONS

•

Global System for Mobile communications™ (GSM™)

and General Packet Radio Service (GPRS) Multiband

Handsets

•

GSM and GPRS Data Modules

FEATURES

•

Supports Multi-slot GPRS up to Class 10

•

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

baseband receive signal

•

Receive path Programmable Gain Amplifier (PGA) for

Automatic Gain Control (AGC) of received signal

•

Burst Store Random Access Memory (RAM) for storage of

transmit data bursts

•

Gaussian Minimum-Shift Keying (GMSK) Digital Modulator

for modulation of Burst Store contents

•

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

of the GMSK modulator output

•

Transmit power ramping and power level control

•

Low noise, voice-band ADC for interface to handset

microphone

•

Low noise voice-band DAC for interface to handset

speaker

•

Auxiliary 8-bit ADC for monitoring system signals such as

battery voltage

•

High speed serial ports for interface to a Baseband

Processor device

•

Internal power supply regulation from a single input

voltage

•

Temperature Sensor for system thermal monitoring

•

104-pin 10 mm x 10 mm FPBGA package

Introduction

The CX20505-14 Integrated Analog (IA) is a highly integrated

device designed for use in multi-band GSM and GPRS

handsets. This device implements all the voice-band, mixed

signal, and radio control functions in a GSM/GPRS handset.

In the receive path, the CX20505-14 digitizes the baseband

In-Phase/Quadrature (I/Q) input, and outputs the digital

samples on the device receive port. The receive path features

a PGA for AGC of the receive signal.

In the transmit path, bursts of digital data are input to the

device over the control port. The 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 device.

The CX20505-14 generates an analog signal to control the

handset Power Amplifier (PA) output level. The signal is then

input to the Power Amplifier Control (PAC) circuit.

The voice-band Codec section provides an interface to a 32

Ω

handset speaker and microphone. Line In/Out signals are also

available for interfacing to audio accessories such as a headset

or car kit.

The device operates directly from a single cell, 3.6 V Li Ion

battery with no external regulation required. The device

features Low Drop Out (LDO) voltage regulators that generate

the required device power supplies from the battery input.

A typical CX20505-14 application in a handset design is shown

in Figure 1. The device is packaged in a compact, 104-pin

(10mm x 10mm) Fine Pitch Ball Grid Array (FPBGA) see

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