SC14WAMDECT datasheet(11/36 Pages) DIALOG

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Datasheet

Revision 3.0

23-Jul-2015

CFR0011-120-00-FM Rev 5

11 of 36

SC14WAMDECT SF

Wireless Audio Module

FINAL

4.0 Functional description

4.1 AUDIO CONFIGURATION

The SC14WAMDECT SF module supports a dedicated

audio channel. The gains can be adjusted to meet the

audio

level

requirements

using

the

SC14WAMDECT SF application reference design. For

other acoustic designs it is needed to adjust and tune

the audio setup.

4.1.1 Microphone connection

The SC14WAMDECT SF module only supports single-

ended connection of a microphone.

4.1.2 Audio equalisation

To enable adjustments of the frequency response the

SC14WAMDECT SF contains two programmable filters

in the TX direction (see Figure 4).

4.2 POWER MANAGEMENT

minimise

the

current

consumption

the

SC14WAMDECT SF module will shut down all codec

amplifiers in Idle state. This means that all reference

voltages in the front-end will be disabled.

4.3 OUT-OF-RANGE HANDLING

When the PP goes in-range or out-of-range a signal is

sent from the PP to the MMI software indicating

whether the PP is in-lock or is out-of-lock with the FP.

This is used to indicate the link status via pins

LED_RED1 and LED_RED2 on the FP.

4.4 PREAMBLE ANTENNA DIVERSITY

To optimise the audio quality during rapidly changing

radio paths (fading), the SC14WAMDECT SF supports

preamble antenna diversity. The preamble diversity

algorithm uses RSSI measurements to judge the radio

signal strength on both antennas and determine the

best performing antenna. This antenna will be used for

the receive slot and for the next transmit slot.

The software embedded in the SC14WAMDECT SF

supports antenna diversity for both FP and PP with at

least one external antenna. Refer to section 5.6 and [1]

for more detailed information.

Figure 4: MIC audio routing

CELT

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