Cirrus Logic CS42L55 - Manual (Page 47)

DS773F1 47
CS42L55
6.8.2 Line Input Select
Selects the specified analog input signal into line amplifier x.
Note: The PGA path must not be selected while the Line Amplifier is powered down.
6.8.3 Headphone Input Select
Selects the specified analog input signal into headphone amplifier x.
Note: The PGA path must not be selected while the Headphone Amplifier is powered down.
6.9 HPF Control (Address 09h)
6.9.1 ADCx High-Pass Filter
Configures the internal high-pass filter after ADCx.
6.9.2 ADCx High-Pass Filter Freeze
Configures the high pass filter’s digital DC subtraction and/or calibration after ADCx.
6.9.3 HPF x Corner Frequency
Sets the corner frequency (-3 dB point) for the internal High-Pass Filter (HPF).
LINExMUX Selected Input to Line Amplifier Ch. x
0 DACx
1 PGAx - Use PGAxMUX bit ( “PGA x Input Select” on page 49 ) to select an input channel.
HPxMUX Selected Input to HP Amplifier Ch. x
0 DACx
1 PGAx - Use PGAxMUX bit ( “PGA x Input Select” on page 49 ) to select an input channel.
7 6 5 4 3 2 1 0
HPFB HPFRZB HPFA HPFRZA HPFB_CF1 HPFB_CF0 HPFA_CF1 HPFA_CF0
HPFx High Pass Filter Status
0 Disabled
1 Enabled
HPFRZx High Pass Filter Digital Subtraction
0 Continuous DC Subtraction
1 Frozen DC Subtraction
HPFx_CF[1:0] HPF Corner Frequency Setting (Fs=48 kHz)
00 1.8 Hz
01 119 Hz
10 236 Hz
11 464 Hz