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VCM

HPLOUT

HPLCOM

HPRCOM

HPROUT

DAC_L2

DAC_R2

PGA_L

DAC_L1

DAC_R1

B0159-01

PGA_R

Volume

Controls,

Mixing

Volume

Controls,

Mixing

Volume

Controls,

Mixing

Volume

Controls,

Mixing

VolumeLevel

0dBto9dB,Mute

VolumeLevel

0dBto9dB,Mute

VolumeLevel

0dBto9dB,Mute

VolumeLevel

0dBto9dB,Mute

TLV320AIC3101

SLAS520D – FEBRUARY 2007 – REVISED DECEMBER 2008 ........................................................................................................................................

www.ti.com

5. Driving stereo headphones in single-ended configuration with two drivers, while the remaining two drivers are

connected in BTL configuration to an 8- Ω speaker

The output stage architecture leading to the high-power output drivers is shown in Figure 33 , with the volume

control and mixing blocks being effectively identical to that shown in Figure 32 . Note that each of these drivers

have a output level control block like those included with the line output drivers, allowing gain adjustment up to 9

dB on the output signal. As in the previous case, this output level adjustment is not intended to be used as a

standard volume control, but instead is included for additional fullscale output signal level control.

Two of the output drivers, HPROUT and HPLOUT, include a direct connection path for the stereo DAC outputs to

be passed directly to the output drivers and bypass the analog volume controls and mixing networks, using the

DAC_L2/R2 path. As in the line output case, this functionality provides the highest quality DAC playback

performance with reduced power dissipation, but can only be utilized if the DAC output does not need to route to

multiple output drivers simultaneously, and if mixing of the DAC output with other analog signals is not needed.

Figure 33. Architecture of the Output Stage Leading to the High-Power Output Drivers

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