User Manual

62 DS851F2

CS42L56

6.8 Class H Control (Address 08h)

6.8.1 Adaptive Power Adjustment

Configures how the power to the headphone and line amplifiers adapts to the output signal level.

6.8.2 Charge Pump Frequency

Sets the charge pump frequency on FLYN and FLYP.

Notes:

1. The output THD+N performance improves at higher frequencies; power consumption increases at

higher frequencies.

6.9 Misc. Control (Address 09h)

6.9.1 Digital MUX

Selects the signal source for the ADC serial port.

76543210

ADPTPWR1 ADPTPWR0 Reserved Reserved CHGFREQ3 CHGFREQ2 CHGFREQ1 CHGFREQ0

ADPTPWR[1:0] Power Supply

00 Adapted to volume setting; Voltage level is determined by the sum of the relevant volume settings

01 Fixed - Headphone and Line Amp supply = ±VCP/2

10 Fixed - Headphone and Line Amp supply = ±VCP

11 Adapted to Signal; Voltage level is dynamically determined by the output signal

Application: “Class H Amplifier” on page 39

CHGFREQ[3:0] N

0000 0

...

0101 5

...

1111 15

Formula:

; where f

MCLK

is the frequency of the MCLK signal after the MCLKDIV2 circuit.

76543210

DIGMUX Reserved Reserved ANLGSFT ANLGZC DIGSFT Reserved FREEZE

DIGMUX SDOUT Signal Source

0 ADC

1 DSP Mix

Frequency

MCLK

4N2+

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