CS47L35 datasheet(144/300 Pages) CIRRUS

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DS1085F3

CS47L35

4.11 Output Signal Path

4.11.7 Headphone and Earpiece Outputs

The headphone/earpiece driver outputs, HPOUTL, HPOUTR, EPOUTP, and EPOUTN, are suitable for direct connection

to external headphones and earpieces. The outputs are ground referenced, eliminating any requirement for AC coupling

capacitors.

The headphone output incorporates a common mode, or ground loop, feedback path that provides rejection of

system-related ground noise. The feedback pin must be connected to ground for normal operation of the headphone

outputs.

The ground feedback path for HPOUTL and HPOUTR is provided via the HPOUTFB1 or HPOUTFB2 pins; the applicable

connection must be selected using ACCDET_SRC, as described in Table 4-71.

Note that the selected feedback pin should be connected to GND as close as possible to the respective headphone jack

ground pin, as shown in Fig. 4-50. In mono (differential) mode, the feedback pin should be connected to the ground plane

that is closest to the earpiece output PCB tracks.

The headphone and earpiece connections are shown in Fig. 4-50.

Figure 4-50. Headphone and Earpiece Connection

4.11.8 Speaker Outputs (Analog)

The speaker driver outputs SPKOUTP and SPKOUTN provide differential (BTL) outputs suitable for direct connection to

an external loudspeaker. The integrated Class D speaker driver provides high efficiency at large signal levels.

R1105 (0x0451)

DAC_AEC_

Control_2

5:2

AEC2_LOOPBACK_

SRC[3:0]

0000

Input source for Tx AEC2 function

0000 = OUT1L

0001 = OUT1R

0110 = OUT4L

1000 = OUT5L

1001 = OUT5R

All other codes are reserved

AEC2_ENA_STS

Transmit (Tx) Path AEC2 Control Status

0 = Disabled

1 = Enabled

AEC2_LOOPBACK_

ENA

Transmit (Tx) Path AEC2 Control

0 = Disabled

1 = Enabled

Table 4-71. Headphone Output (HPOUT) Ground Feedback Control

Bit

Label

Default

Description

R659 (0x0293)

Accessory_

Detect_Mode_1

ACCDET_SRC

Accessory Detect/Headphone Feedback pin select

0 = Accessory detect on MICDET1; Headphone ground feedback on HPOUTFB1

1 = Accessory detect on MICDET2; Headphone ground feedback on HPOUTFB2

Table 4-70. Output Signal Path AEC Loop-Back Control (Cont.)

Bit

Label

Default

Description

Earpiece

The HPOUTFB1 or HPOUTFB2 pin is

selected by the ACCDET_SRC register bit.

HPOUTL

HPOUTR

HPOUTFB1

HPOUTFB2

EPOUTP

EPOUTN

CS47L35

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