SC14CVMDECT-SF datasheet(15/57 Pages) DIALOG

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Datasheet

Revision 3.0

28-Jul-2015

CFR0011-120-00-FM Rev 5

15 of 57

SC14CVMDECT SF

Cordless Voice Module

FINAL

4.3 AUDIO CONFIGURATIONS

The SC14CVMDECT SF audio supports standard

DECT audio qualities. The audio gain and volume

parameters are placed in the VES. The DECT gains

can be adjusted to meet the TBR38 and TBR10 audio

level requirements by using the SC14CVMDECT SF

application reference design. For other line and acous-

tic designs it is required to adjust and tune the audio

setup.

4.3.1 Audio connection

The SC14CVMDECT SF PP audio connections are

shown in Figure 8. Refer to "Example application dia-

gram" on page 49 for detailed component values.

Earpiece or small loudspeaker connection

The earpiece loudspeaker can be connected either dif-

ferentially or single-ended. Dynamic loudspeakers with

an impedance of 30

 can be connected, as well as

ceramic loudspeakers equivalent to 600

 and 30 F.

Refer to Table 28 for a detailed specification or the ear-

piece loudspeakers.

The earpiece is connected to the LSRp and LSRn pins.

Microphone connection

The microphone can be connected either single-ended

via MICp or differentially to MICp and MICn.

Headset connection

The headset microphone must be connected to the

MICh pin. The headset earpiece is connected to the

LSRp.

Microphone supply connection

For active microphones a voltage source with high sup-

ply voltage rejection ratio is provided on supply pins

VREFp/VREFm. Filtering of internal and external refer-

ence voltages is provided by an internal capacitor. No

external capacitor shall be connected to pin VREFp. To

avoid audible switching noise it is important that the

ground supply signals are directly “star point” con-

nected to the VREFm and not via a common ground

plane. From this VREFm star point, one connection is

made to the common ground plane.

Loudspeaker connection

For the handsfree operation a 4

 loudspeaker must

be connected to the PAOUTp and PAOUTn pins as

shown in Figure 9. The VDDPA is the supply pin.

Refer to Table 31 for a detailed specification of the

external components around the loudspeaker. These

components are necessary to guarantee the lifetime of

the module.

Figure 8: Audio connections

LSRn

LSRp

MICh

MICn

VREFm

MICp

VREFp

Figure 9: Loudspeaker connection

PAOUTp

PAOUTn

VDDPA

VSS/GND

C_VDDPA

Cs_PAOUT

Rs_PAOUT

Cs_PAOUT

Rs_PAOUT

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