CS47L85 datasheet(222/370 Pages) CIRRUS

222 / 370 page

CS47L85

222

Rev 4.3

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R659

(0293h)

Accessory

_Detect_M

ode_1

ACCDET_SRC

Accessory Detect / Headphone Feedback

pin select

0 = Accessory detect on MICDET1,

Headphone ground feedback on

HPOUT1FB1

1 = Accessory detect on MICDET2,

Headphone ground feedback on

HPOUT1FB2

Table 81 Headphone Output (HPOUT1) Ground Feedback Control

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 61 Headphone and Earpiece Connection

SPEAKER OUTPUTS (ANALOGUE)

The speaker driver outputs SPKOUTLP, SPKOUTLN, SPKOUTLP and SPKOUTLN provide two differential (BTL) outputs

suitable for direct connection to external loudspeakers. The integrated Class D speaker driver provides high efficiency at

large signal levels.

The speaker driver signal paths incorporate a boost function which shifts the signal levels between the AVDD and SPKVDD

voltage domains. The boost is pre-configured (+12dB) for the recommended AVDD and SPKVDD operating voltages (see

“Recommended Operating Conditions”).

Ultra-low leakage and high PSRR allow the speaker supply SPKVDD to be connected directly to a lithium battery. Note that

SPKVDDL powers the Left Speaker driver, and SPKVDDR powers the Right Speaker driver; it is assumed that SPKVDDL

= SPKVDDR = SPKVDD.

Note that SYSCLK

must be present and enabled when using the Class D speaker output; see “Clocking and Sample Rates”

for details of SYSCLK and the associated register control fields.

The OUT4L and OUT4R output signal paths are associated with the analogue outputs SPKOUTLP, SPKOUTLN,

SPKOUTLP and SPKOUTLN.

The Class D speaker output is a pulse width modulated signal, and requires external filtering in order to recreate the audio

signal. With a suitable choice of external speakers, the speakers themselves can provide the necessary filtering. See

“Applications Information” for further information on Class D speaker connections.

The external speaker connection is illustrated in Figure 62, assuming suitable speakers are chosen to provide the PWM

filtering.

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