User's Manual

AnyDATA.NET Inc. AnyTime AnyPlace Any Wireless Data Solution
TM
4.4 Stereo Wideband CODEC Interface
With the integrated microphone and earpiece amplifier including CODEC, the DTEV-Dual
module interfaces directly, either differential or single-ended, to the microphone and earpiece.
The audio features in the module are
- Two microphone inputs
- Two earphone outputs and one auxiliary audio output.
4.4.1 Microphone and earphone Interface
The module contains analog audio interface circuitry. The contained audio interface supports all of the
required conversation and amplification stages for the audio front end.
The audio interface includes the amplification stages for both the microphone and earphone.
The module supports audio outputs with its variable gain audio as volume control can be used for
audio alerts or speaker phone. The speaker driver has programmable gain, turn-on time, and muting, and
operates as a differential device delivering a volume-controlled 500mW to an external 8-Ohm speaker.
The EAR10 and MIC1P are typically used for the handset ear-piece/mic.
The EAR_JACK+ and MIC2P are typically used for the ear-jack.
Table 4-4.1 Analog Audio Pinouts
Pin # Pin Name Main Function Type Description
73 SPK_M SPRK_OUT_M O Loud speaker output (-)
75 SPK_P SPRK_OUT_P O Loud speaker output (+)
80 EAR10_P EAR10_P O Ear-piece output (+)
81 EAR10_M EAR10_M O Ear-piece output (-)
82 MIC1_P MIC1_P I Mic. (+) input
95 MIC1_M MIC1_M I Mic. (-) input
78 EAR_DET EAR_DET1 I EAR/MIC Set Detect*
* EAR_DET checks to see if a headset has been connected to the ear-jack. When there is no headset
connected to the ear-jack, the audio path thru an ear-jack is disconnected and ear-piece/mic. is connected.
Setting EAR_DET to HIGH disconnects ear-jack and connects ear-piece/mic.
All Rights Reserved.
AD-2001-06-28 Ver 1.1
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