Only For Training And Service Purposes - LG GM210 Service Manual

3. TECHNICAL BRIEF
3.2.1 General Description
The AD6725 baseband transmit section supports the following mobile station GMSK
modulation power classes:
• GSM 900/850 power classes 4 and 5,
• DCS 1800 power classes 1 and 2, and
• PCS 1900 power classes 1 and 2.
The AD6725 baseband transmit section supports the following mobile station 8-PSK
modulation power classes:
• GSM 900/850 power classes E2 and E3,
• DCS 1800 power classes E2 and E3, and
• PCS 1900 power classes E2 and E3.
The AD6725 baseband receive section supports GMSK and 8-PSK applications.
The AD6725 auxiliary section provides a voltage reference, an automatic frequency control DAC, an auxiliary
ADC, and light controllers. The auxiliary ADC provides two channels for measuring temperature using discrete
external devices placed in critical locations. The AD6725 audio section provides 8 kHz and 16 kHz sampling
rates for voiceband data input and output and provides nine standard sample rates ranging from 8kHz to 48
kHz for personal audio output on two PCM Audio serial ports. The two Audio serial ports allow support for
concurrency. The AD6725 power management section provides voltage regulators for digital and analog
components, a battery charger, battery protection circuitry, and power supply activation logic. The AD6725
digital processor
interface provides serial ports for control data, baseband transmit and receive data, and two for audio data.
LGE Internal Use Only
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

- 20 - Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes