CX20505 Datasheet, PDF (1/4 Pages) List of Unclassifed Manufacturers – Integrated Analog Device for GSM and GPRS Applications

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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103186A
Skyworks Solutions, Inc., Proprietary and Confidential
[781] 376-3000fax [781] 376-3100[e-mail]www.skyworksinc.com
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September 22, 2003