Table of Contents
Advertisement
3. TECHNICAL BRIEF
3.12 Microphone
The microphone is soldered to the main PCB. The audio signal is passed to VINNORP (#K8) and
VINNORN (#K7) pins of AD6522. The voltage supply 2V45_VCORE is output from ADP3408, and is
a bias voltage for both the VINNOR (through R105) and VINAUX (through R104) lines.
The VINNOR or VINAUX signal is then A/D converted by the Voiceband ADC part of AD6521.
The digitized speech is then passed to the DSP section of AD6522 for processing (coding,
interleaving etc.).
Figure 3-12. Microphone.
- 30 -
Advertisement
Table of Contents
