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3.10 Audio Interface
K14
LOUD2
L15
LOUD1
P12
VMIC
P11
MICP2
R12
MICN2
P15
MICP1
R13
MICN1
M14
EPPA1
M12
EPP1
N15
EPN1
The audio front-end of E-GOLDvoice offers the digital and analog circuit blocks for both receive and
transmit audio operation and ringing. It features a high-quality, digital-to-analog path with amplifying
stages for connecting acoustic transducers to the E-GOLDvoice. In the transmit direction the supply
voltage generation for microphones, low-noise amplifier and analog to digital conversion are integrated
on the E-GOLDvoice.
For E-GOLDvoice the EPp1/EPn1 driver are used as differntial Earpiece-Driver, EPPa1 is used as
single-ended Headset-Driver.
The audio front-end itself can be considered to be organized in three sub-blocks:
• Interface to processor cores (TEAKlite and - indirectly - C166S)
• Digital filters
• Analog part.
SPK_N
SPK_P
Figure 3-10-1 Audio interface
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3. TECHNICAL BRIEF
VMIC
AUXIP
C124
AUXIN
1000p
VINNORP
VINNORN
EPPA1
REC_P
REC_N
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