Specifications

Rev 2.0 Apr.10 Proprietary and Confidential 47
4
4: Audio Interface
Note: Values in this guide
are taken from the appro-
priate product specifi-
cation documents (PSDs)
(listed in Related
documents on page 13)—
in the case of a
discrepancy between this
document and the relevant
PSD, use the value listed
in the PSD.
AirPrime embedded modules that support voice (MC5727V /
MC5728V / MC8775V/MC8790V/MC8791V/MC8792V/MC8795V)
support the following audio modes that may be required by a host
audio system:
• Handset
• Headset
• Car kit
• Speakerphone
• AUX (MC5727V /MC5728V modules are preconfigured for HAC
[Hearing Aid Compatibility])
• TTY
The modules support both a differential analog interface and PCM
digital audio, and allow dynamic run-time selection of the appropriate
mode.
Tabl e 4- 1 summarizes the key audio features of these modules.
Table 4-1: Embedded module audio features
Feature Transmit Receive
Gain (adjustable) MC5727V:
• MIC_AMP1: Programmable to 0 dB or +24 dB.
• MIC_AMP2: Programmable from -6 dB to +25.5 dB in
steps of 1.5 dB.
MC5728V:
• Programmable to 0 dB or +24 dB.
MC8775V/MC8790V/MC8791V/MC8792V/MC8795V:
• Up to +48.5 dB analog gain available (when the
analog interface is selected).
Up to +12 dB
Filtering stages Several adjustable high-pass and slope filters High-pass filter
Noise suppression Supported n/a
Echo cancellation Configurable for each audio mode (headset, handset,
speakerphone, and car kit)
n/a
Output driver stage n/a Supported
FIR (Finite Impulse
Response) filtering
MC8xxx:
• Option of providing 13 tap FIR filtering for receive and transmit paths to
equalize the acoustic response of the speaker and microphone elements.
Audio pass band 300 Hz–3.4 kHz