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CX20505-14

更新时间： 2024-11-05 22:17:07
品牌 Logo 应用领域
其他 - ETC GSM
页数 文件大小 规格书
4页 101K
描述
Integrated Analog Device for GSM and GPRS Applications

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CX20505-14 数据手册

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PRODUCT SUMMARY  
CX20505-14 Integrated Analog Device for GSM and GPRS  
Applications  
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.  
APPLICATIONS  
•
Global System for Mobile communications™ (GSM™)  
and General Packet Radio Service (GPRS) Multiband  
Handsets  
•
GSM and GPRS Data Modules  
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.  
FEATURES  
•
•
Supports Multi-slot GPRS up to Class 10  
Σ∆ Analog-to-Digital Converters (ADCs) for digitization of  
baseband 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.  
•
•
•
•
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  
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.  
•
•
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  
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  
Error! Reference source not found...  
•
•
.
103186A  
Skyworks Solutions, Inc., Proprietary and Confidential  
[781] 376-3000fax [781] 376-3100sales@skyworksinc.comwww.skyworksinc.com  
1
September 22, 2003  
1234

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