LG GX200 Service Manual page 21

Audio
Using a highly integrated mixed-signal Audio Front-End, the MT6235 architecture allows for
easy audio interfacing with direct connection to the audio transducers. The audio interface
integrates D/A and A/D Converters for Voice band, as well as high resolution Stereo D/A
Converters for Audio band. In addition, MT6235 also provides Stereo Input and Analog MUX.
MT6235 supports AMR codec to adaptively optimize speech and audio quality. Moreover,
HE-AAC codec is implemented to deliver CD-quality audio at low bit rates.
On the whole, MT6235's audio features provide a rich solution for multi-media applications.
Radio
MT6235 integrates a mixed-signal baseband front-end in order to provide a well-organized
radio interface with flexibility for efficient customization. The front-end contains gain and offset
calibration mechanisms, and filters with programmable coefficients for comprehensive
compatibility control on RF modules. This approach allows the usage of a high resolution D/A
Converter for controlling VCXO or crystal, reducing the need for an expensive TCVCXO. MT6235
achieves great MODEM performance by utilizing a 14-bit high resolution A/D
Converter in the RF downlink path. Furthermore, to reduce the need for extra external
current-driving component, the driving strength of some BPI outputs is designed to be
configurable.
Debug Function
The JTAG interface enables in-circuit debugging of the software program with the
ARM926EJ-S core. With this standardized debugging interface, MT6235 provides
developers with a wide set of options in choosing ARM development kits from different third party
vendors.
Power Management
The MT6235 offers various low-power features to help reduce system power consumption.
These features include a Pause Mode of 32 KHz clocking in Standby State, Power Down Mode
for individual peripherals, and Processor Sleep Mode. MT6235 is also fabricated in an advanced
low leakage CMOS process, hence providing an overall ultra low leakage solution.
Package
The MT6235 device is offered in a 13mm×13mm, 362-ball,
0.5 mm pitch, TFBGA package.
3.1.2 Platform Features
General
Integrated voice-band, audio-band and base-band analog front ends
TFBGA 13mm×13mm, 362-ball, 0.5 mm pitch package
MCU Subsystem
ARM926EJ-S 32-bit RISC processor
High performance multi-layer AMBA bus
Java hardware acceleration for fast Java-based games and applets
Operating frequency: 26/52/104/208 MHz
Dedicated DMA bus
14 DMA channels
512K bits on-chip SRAM
384K bits Instruction-TCM
640K bits Data-TCM
-21-