CS42L56 查看數據表（PDF） - Cirrus Logic

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CS42L56

Ultralow Power, Stereo Codec with Class H Headphone Amp

Cirrus Logic 

Output Level

-10 dB

1 second

CS42L56

Time

Amplifier Rail

Voltage

VCP

VCP

2

- VCP

2

- VCP

Time

Figure 26. VHPFILT Hysteresis

4.5.3

Efficiency

As discussed in previous sections, the amplifiers internal to the CS42L56 operate from one of two sets of

rail voltages, based upon the needs of the signal being amplified or the total gain/attenuation settings. The

power curves for the two modes of operation are shown in Figure 27 and Figure 28.

This graph details the power supplied to a load versus the power drawn from the supply for each of the

three use cases.

All Supplies= 1.8 V

RL = 32 

Class AB Amplifiers do not

conserve power with typical

headphone loads.

Class H Amplifiers automatically

switch between ±VCP and ±VCP/2

to conserve power with typical

headphone loads.

±VCP

±VCP/2

Figure 27. Class H Power to Load vs. Power from VCP Supply - 32 

DS851F2

43

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