TS4604

Application information

Doc ID 17913 Rev 1

25/31

Figure 54.

TS4604 with IPAD for ESD immunity

6.11

Pop-&-click circuitry

Thanks to the internal negative supply the headphone and line driver outputs are referred to

ground without the need for bulky in-series capacitors. As a result, the pop created by these

bulky capacitors is eliminated. In addition, the TS4604 includes a pop-&-click circuitry that

suppresses any residual pop on the outputs, thus enabling the outputs to be virtually pop-&-

click-free.

6.12

Start-up phase

To further improve the pop-&-click performance, two important points must be taken into

account during the start-up phase.

Input capacitor

During the start up phase, as long as the AC input coupling capacitors are not fully charged,

we suggested to remain the EN_LD and En_HP and/or Ext_UVP pin low.

The constant time for an RC filter is given by:

We can consider that the input capacitor Cin will be charged at 95% of its maximum value

at:

OUT_R

OUT_L

A1

A2

B2

Gnd

IPAD

Gnd

Gnd

+

-

-

+

InR-

InR+

InL-

InL+

OUT_R

OUT_L

TS4604

C1

C2

AM06147

τ

Rin

Cin

⋅

=

T3

τ

=