CS43130 Datasheet, PDF (28/137 Pages) Cirrus Logic – 130-dB, 32-Bit High-Performance DAC with Integrated Headphone Driver

CS43130
4.3 Class H Amplifier Output
AMUTE, DSD_AMUTE_BEQA, DSD_MUTE_A, DSD_MUTE_B, DSD_INV_A, DSD_INV_B, DSD_SWAP_CHAN, and
DSD_COPY_CHAN. Refer to Section 7.4.1–Section 7.4.7 for control register details.
4.3 Class H Amplifier Output
Fig. 4-2 shows the Class H operation.
ADPT_PWR p. 112
Class H Control
+VP_LDO V
VP
+VCP
VCP_FILT+
VCP
–VP_LDO V
–VCP
VCP_FILT–
Figure 4-2. Class H Operation
The CS43130 headphone output amplifiers use Cirrus Logic two-mode Class H technology. This technology maximizes
operating efficiency of the typical Class AB amplifier while maintaining high performance. In a Class H amplifier design,
the rail voltages supplied to the amplifier vary with the needs of the music passage that is being amplified. This prevents
unnecessarily wasting energy during low power passages of program material or when the program material is played
back at a low volume level.
The internal charge pump, which creates the rail voltages for the headphone amplifiers, is the central component of the
two-mode Class H technology implemented in the CS43130. The charge pump receives its input voltage from the voltage
present on the VCP or VP pin. From this input voltage, the charge pump creates the differential rail voltages supplied to
the amplifier output stages. The charge pump can supply two sets of differential rail voltages: ±VCP and ±VP_LDO.
HV_EN setting, as shown in Fig. 4-3, determines the VP_LDO voltage as shown in Table 4-1. HV_EN = 1 setting is
required to support the 1.7-V full-scale voltage for a 600- load and above. In this setting, minimum VP is required to be
higher than 3.3 V, and any load below 600  is not supported. When HV_EN = 0, the max output voltage is 1.4-V RMS
full-scale voltage. In this setting, minimum VP is required to be higher than 3 V, and the full headphone load range is
supported.
HV_EN p. 112
VP
Internal
VP_LDO
LDO
Figure 4-3. Internal LDO Configuration
Table 4-1. VP_LDO Voltage Per HV_EN Setting
HV_EN
0
1
VP_LDO Voltage
2.6 V
3.0 V
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DS1073F1