WM9090ECSSLASHR datasheet(31/81 Pages) WOLFSON

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WM9090

PD, November 2010, Rev 4.1

ANALOGUE OUTPUTS

The speaker, headphone and earpiece outputs are highly configurable and may be used in many

different ways.

SPEAKER OUTPUT CONFIGURATIONS

The Class D speaker output is driven by the speaker mixer, SPKMIX. The speaker output operates in

a BTL configuration. Fine volume control is available using the Speaker Output PGA; a boost

function is also available. See the “Output Signal Path” section for more information on the speaker

mixing options.

Eight levels of signal boost are provided in order to deliver maximum output power for many

commonly-used SPKVDD/AVDD combinations. The boost level from 0dB to +12dB is selected using

the SPKOUTL_BOOST register field. To prevent pop noise, the SPKOUTL_BOOST register should

not be modified while the speaker output is enabled. Figure 4 illustrates the speaker output and the

mixing and gain/boost options available.

Ultra-low leakage and high PSRR allow the speaker supply SPKVDD to be directly connected to a

lithium battery. Note that an appropriate SPKVDD supply voltage must be provided to prevent

waveform clipping when speaker boost is used.

DC gain is applied automatically to adjust the signal from VMID to SPKVDD/2. This provides

optimum signal swing for maximum output power.

Figure 4 Speaker Output Configuration and Boost Operation

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R37 (25h)

ClassD3

5:3

SPKOUTL_BOOST

[2:0]

000

(1.0x)

Speaker Output Gain Boost

000 = 1.00x boost (+0dB)

001 = 1.19x boost (+1.5dB)

010 = 1.41x boost (+3.0dB)

011 = 1.68x boost (+4.5dB)

100 = 2.00x boost (+6.0dB)

101 = 2.37x boost (+7.5dB)

110 = 2.81x boost (+9.0dB)

111 = 3.98x boost (+12.0dB)

Table 15 Speaker Boost Control

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