5. PHYSICAL INTERFACE
5.1 Power Supply
The transient response of the regulator is important. If the power rails of the module are
supplied from an external voltage source, the transient response of any regulator used
should be 20µs or less.
5.2 Audio Interfaces
Audio interface as following features:
Mono analogue input for voice band and audio band
Stereo and mono analogue output for voice band and audio band
Figure F6igure 6
The stereo audio CODEC uses a fully differential architecture in the analogue signal path,
which results in low noise sensitivity and good power supply rejection while effectively
doubling the signal amplitude. It uses a minimum of external components. The module
features a differential stereo audio output interfaces.
The ADC consists of a second order Digma Delta converter as show in Figure 6.