CS42L56 datasheet(43/92 Pages) CIRRUS

Part #	CS42L56

Description	Ultralow Power, Stereo Codec with Class H Headphone Amp

PDF	92 Pages

Scroll/Zoom	100%

Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

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43 / 92 page

DS851F2

CS42L56

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.

Output Level

-10 dB

VCP

- VCP

Amplifier Rail

Voltage

1 second

Time

Figure 26. VHPFILT Hysteresis

Class H Amplifiers automatically

switch between ±VCP and ±VCP/2

to conserve power with typical

headphone loads.

Class AB Amplifiers do not

conserve power with typical

headphone loads.

±VCP/2

±VCP

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



All Supplies= 1.8 V

RL = 32 

CS42L56 Datasheet(PDF) 43 Page - Cirrus Logic