WM8985
Pre-Production
Figure 28 LOUT2 and ROUT2 Class AB Headphone Configuration
The output configurations shown in figures 29 and 30 are both suitable for class AB operation.
The signal output on LOUT2/ROUT2 comes from the Left/Right Mixer circuits and can be any
combination of the DAC output, the bypass path (output of the input boost stage) and the AUX input.
The LOUT2/ROUT2 volume is controlled by the LOUT2VOL/ ROUT2VOL register bits. Gains over
0dB may cause clipping if the input signal is too high. The LOUT2MUTE/ ROUT2MUTE register bits
cause these outputs to be muted (the output DC level is driven out). The output pins remain at the
same DC level, so that no click noise is produced when muting or un-muting.
PP, Rev 3.4, October 2006
68
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
