WM8352 datasheet(85/336 Pages) WOLFSON

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Production Data

WM8352

PD, February 2011, Rev 4.4

13.9.2

OUT2L AND OUT2R

OUT2L and OUT2R are designed as a stereo pair and can drive a headphone, a line load or a

loudspeaker amplifier. Each output has an analogue volume control PGA with a gain range of -57dB

to +6dB as shown in Figure 45.

Common mode noise rejection is also possible on the OUT2L and OUT2R outputs, using HPCOM as

the return path. The HPCOM feature must be enabled via the OUT2_FB register field and the

HPCOM connection must be AC coupled to the headphone output. A 4.7uF coupling capacitor is

required between the noisy ground connection the HPCOM pin.

The signal path from the right output mixer to OUT2R can be inverted, using the OUT2R_INV and

OUT2R_INV_MUTE register bits. Table 41 describes the required settings of these register bits for

inverted and non-inverted configurations. Note that the OUT2R_MUTE mutes the OUT2R signal path

in both cases.

OUT2R_INV

OUT2R_INV_MUTE

DESCRIPTION

Non-inverting path from MIXOUTR to OUT2R

Inverting path from MIXOUTR to OUT2R

Table 41 OUT2R Signal Path Polarity

The control register fields for the OUT2L and OUT2R outputs are described in Table 42. The

available output configurations are shown in Section 13.9.3.

From right

output mixer

-1

OUT2R_VOL

R107 [7:2]

From left

output mixer

OUT2L_VOL

R106 [7:2]

-1

OUT2L

OUT2R

Vmid

OUT2L_MUTE

R106 [14]

OUT2R_MUTE

R107 [14]

HPCOM

OUT2_FB

R76 [2]

Figure 45 Headphone Outputs OUT2L and OUT2R

WM8352 Datasheet(PDF) 85 Page - Wolfson Microelectronics plc

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