CX20524-12/CX20524-13 Mixed Signal Device for GSM and GPRS Applications

kinpoagilent

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, voiceband,
mixed signal, and radio control functions required in a
GSM/GPRS handset and module.
In the receive path, the MSD digitizes the baseband In-
Phase/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 block diagram for the CX20524 MSD is shown in Figure 1.
The CX20524 MSD is packaged in the following options.
• The CX20524-12 is a 12 x 12 mm, 0.8 mm pitch, 160-pin Fine
Pitch Ball Grid Array (FPBGA). The pinout diagram is shown in
Figure 2. Pin assignments and descriptions are provided in
Table 1.
• The CX20524-13 is a 10 x 10 mm, 0.5 mm pitch, 180-pin
FPBGA. The pinout diagram is shown in Figure 3. Pin
assignments and descriptions are provided in Table 2
【文件名】:09113@52RD_CX20524-12 CX20524-13 Mixed Signal Device for GSM and GPRS Applications.pdf
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