CS43199 datasheet(24/111 Pages) CIRRUS

24 / 111 page

DS1113F1

CS4399

4.3 Class H Output

DSD_COPY_CHAN. Refer to Section 7.4.1–Section 7.4.7 for control register details.

4.3 Class H Output

Fig. 4-2 shows the Class H operation.

Figure 4-2. Class H Operation

The CS4399 outputs use Cirrus Logic two-mode Class H technology. 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 is the central component of the two-mode Class H technology implemented in the CS4399. 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 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. In this setting, minimum VP is required to be higher than 3.3 V. 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

3V.

Figure 4-3. Internal LDO Configuration

Table 4-2 shows the nominal signal and volume level ranges when the output is set to the adapt modes explained in

Section 4.3.1. If the signal level is greater than the maximum value of this range, then clipping can occur.

Table 4-1. VP_LDO Voltage Per HV_EN Setting

HV_EN

VP_LDO Voltage

02.6 V

13.0 V

Table 4-2. Class H Supply Modes

Mode

Class H Supply Level

Signal 1 or Volume Level Range 2,3,

1.In adapt-to-signal, the volume level ranges are approximations but are within –0.5 dB from the values shown.

±VP_LDO V, internally regulated from VP

 –11 dB

±VCP

< –11 dB

VCP

Class H Control

VCP_FILT–

–VCP

–VP_LDO V

VCP_FILT+

+VCP

+VP_LDO V

ADPT_PWR p. 89

VP_LDO

Internal

LDO

HV_EN p. 89

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