DA7218 datasheet(13/198 Pages) RENESAS

13 / 198 page

DA7218

Ultra-Low Power Stereo Codec

Datasheet

Revision 3.4

24-Dec-2021

CFR0011-120-00

13 of 197

The GND_SENSE trace should run in parallel with the HPL and HPR traces in a differential-style

routing for best common-node noise rejection.

4.4.4

HPLDET

HPLDET is used to detect the insertion or removal of a jack. If used it must be connected to the tip

detect pin in the headphone socket.

If not required it must be left unconnected.

4.5

Charge Pump Pins

4.5.1

HPCSP

HPCSP is the positive output from the headphone charge pump. This pin should be connected to

ground via a reservoir capacitor.

4.5.2

HPCSN

HPCSN is the negative output from the headphone charge pump. If using the charge pump, this pin

must be connected to ground via a reservoir capacitor. If the charge pump is not being used, then

this pin should be tied directly to ground.

4.5.3

HPCFP

HPCFP is one of the flying capacitor connections required by the headphone charge pump. If the

charge pump is in use it must be connected to HPCFN via a capacitor. If the charge pump is not

being used, then this pin can be left floating.

4.5.4

HPCFN

HPCFP is one of the flying capacitor connections required by the headphone charge pump. If the

charge pump is in use it must be connected to HPCFP via a capacitor. If the charge pump is not

being used, then this pin can be left floating.

4.6

References

4.6.1

VMID

VMID is mid-rail reference decoupling capacitor connection.

4.6.2

DACREF

DACREF is the DAC reference decoupling capacitor connection.

4.6.3

VREF

VREF is the bandgap reference decoupling capacitor connection.

4.6.4

MICBIAS1

MICBIAS1 is the first of two MICBIAS outputs. This must be decoupled with a 1

µF capacitor

4.6.5

MICBIAS2

MICBIAS2 is the second of two MICBIAS outputs. This must be decoupled with a 1

µF capacitor.

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