WM9093ECSSLASHR datasheet(34/84 Pages) WOLFSON

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WM9093

Production Data

PD, March 2012, Rev 4.2

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R34 (22h)

SPKMIXL

Attenuation

SPKOUT_CLASSAB

_MODE

Speaker Class AB Mode Enable

0 = Class D mode (for SPKMIX

source)

1 = Class AB mode (for Voice

Bypass source)

R37 (25h)

ClassD3

SPK_ATTN_FB

Speaker Amplifier Gain

0 = 0dB

1 = -12dB

Note – this bit has no effect in Class

D mode; the 0dB setting is always

implemented in Class D mode.

SPK_VREF_AB_CT

Selects Reference for Speaker in

Class AB mode

0 = SVDD/2

1 = VMID

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 Mode and Boost Control

HEADPHONE OUTPUT CONFIGURATIONS

The headphone output pins HPL and HPR are driven by the headphone output PGAs. Each PGA has

its own dedicated volume control, as described in the “Output Signal Path” section. The inputs to

these PGAs come from the respective output mixers MIXOUTL or MIXOUTR.

The headphone output driver is capable of driving up to 35mW into a 16Ω load such as a stereo

headset or headphones. The outputs are ground-referenced, eliminating any requirement for AC

coupling capacitors. This is achieved by having separate positive and negative supply rails powered

by an on-chip charge pump. A DC Servo circuit removes any DC offset from the headphone outputs,

suppressing ‘pop’ noise and minimising power consumption. The Charge Pump and DC Servo are

described separately (see “Charge Pump” and “DC Servo” respectively).

The zobel network components should be connected to the headphone output pins HPL and HPR for

best audio performance in all applications. The components of the zobel network have the effect of

dampening high frequency oscillations and instabilities that can arise outside the audio band under

certain conditions. Possible sources of these instabilities include the inductive load of a headphone

coil or an active load in the form of an external line amplifier. The capacitance of lengthy cables or

PCB tracks can also lead to amplifier instability. The zobel network should comprise of a 20

 resistor

and 100nF capacitor in series with each other, as illustrated in Figure 5.

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