CS47L85 datasheet(352/370 Pages) CIRRUS

352 / 370 page

CS47L85

352

Rev 4.3

Earpiece

The HPOUT1FB1 or HPOUT1FB2 pin is

selected by the ACCDET_SRC register bit.

CS47L85

HPOUT1L

HPOUT1R

HPOUT1FB1

HPOUT2L

HPOUT2R

HPOUT2FB

HPOUT1FB2

HPOUT3L

HPOUT3R

HPOUT3FB

Each headphone output can support stereo (single-

ended) or mono (differential) output. The illustration

shows the configuration for a typical application.

Figure 91 Headphone and Earpiece Connection

It is common for ESD diodes to be wired to pins that link to external connectors. This provides protection from potentially

harmful ESD effects. In a typical application, ESD diodes would be recommended for the headphone paths (HPOUT1,

HPOUT2, HPOUT3), when used as external headphone or line output.

The HPOUTn outputs are ground-referenced, and the respective voltages may swing between +1.8V and -1.8V. The ESD

diode configuration must be carefully chosen.

The recommended ESD diode configuration for these ground-referenced outputs is illustrated in Figure 92

. The ‘back-to-

back’ arrangement is necessary in order to prevent clipping and distortion of the output signal.

Note that similar care is required when connecting the CS47L85 outputs to external circuits that provide input path ESD

protection - the configuration on those input circuits must be correctly designed to accommodate ground-referenced signals.

CS47L85

HPOUTnL

HPOUTnR

External Headphone/Line

output connection

External Headphone/Line

output connection

ESD Protection Diodes

Figure 92 ESD Diode Configuration for External Output Connections

CS47L85 Datasheet(PDF) 352 Page - Cirrus Logic