MOBILE COMMUNICATIONS DIVISION
CUSTOMER SERVICES
Version 1.0 22/11/2006
Created by Konrad Szombara
Page 70 of 103
6.4 AUDIO SYSTEM
Figure Audio system block diagram
AD6537B is a complete mixed-signal baseband processor that combines all of
the data converters and power supply regulators required for GSM 900 /GSM
850 /DCS 1800 / PCS 1900 mobile on a single device, including HSCSD and
GPRS. The AD6537B auxiliary section provides a voltage reference, an
automatic frequency controller, an auxiliary ADC, and light controllers. It also
provides three differential Voiceband input and output ports. Voiceband
output1 is used in normal receiver mode, while output3 is used as earpiece
receiver mode or loud speaker mode by analog switch. About input ports,
Voiceband input1 is used for microphone and input2 is design for earpiece
microphone.
