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3. TECHNICAL BRIEF
3.6.4 Audio Section
1. Receive audio signal from microphone. B2000 uses differential configuration.
2. Send audio signal to speaker. B2000 uses differential configuration.
3. This section provides an audio codec with a digital-to-analog converter and an
analog-to-digital converter, a ring tone volume controller, a microphone interface, and multi-
pleanalog input and output channels.'
4. It interconnects with external devices like main microphone, main receiver, and headset.
The descriptions of audio port used in B2000 are given bellow in detail.
<Up Link>
- AIN1P,AIN1N : Main microphone positive/negative terminal
- AIN2P,AIN2N : Headset microphone positive/negative terminal
- AIN3P,AIN3N : External Analog Input terminal
<Down Link>
- AOUT1P,AOUT1N : Main Speaker positive/negative terminal
- AOUT3P : Headset speaker terminal
AD6537B
GPI
CSFS
Control
CSDI
Serial
CSDO
Port
ASFS
Audio
ASDI
Serial
Port
ASDO
Ring Tone
Volume Controller
Filter/
DAC
SRC
PGA
Filter/
ADC
SRC
Figure 3-15 AD6537B AUDIO SECTION
PGA
PGA
Analog Adder
Microphone Interface
Gain
Pre-Amp
- 32 -
AIN3P
AIN3N
Analog
SPWR
Switch
AOUT2P
AOUT2N
SGND
Analog
Switch
AOUT1P
AOUT1N
AOUT3P
AOUT3N
AIN1P
AIN1N
AIN2P
AIN2N
8
32
32
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