Cirrus Logic CS43L21 - Manual (Page 57)

DS723F1 57
CS43L21
7.2 Headphone Amplifier Efficiency
The architecture of the headphone amplifier is that of typical class AB amplifiers. Test conditions (unless
otherwise specified): Input test signal is a 997 Hz sine wave; Power Consumption Mode 6 - Stereo Playback
with 16-
 load. HP_GAIN = 1.1430. Best efficiency is realized when the amplifier outputs maximum power.
Figure 25. Power Dissipation vs. Output Power into Stereo 16

VA_HP = VA = 1.8 V
Figure 26. Power Dissipation vs. Output Power into Stereo 16
(Log Detail)
VA_HP = VA = 1.8 V