Cirrus Logic CS42L56 - Manual (Page 62)

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.
7 6 5 4 3 2 1 0
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.
7 6 5 4 3 2 1 0
DIGMUX Reserved Reserved ANLGSFT ANLGZC DIGSFT Reserved FREEZE
DIGMUX SDOUT Signal Source
0 ADC
1 DSP Mix
Frequency
f
MCLK
4 N 2 +   
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