AK2401 Datasheet, PDF (85/103 Pages) Asahi Kasei Microsystems – Direct Conversion Transceiver

[AK2401]
15.18. <0x24~0x25>HPF
Address
D7
D6
D5
D4
0x24
X
Initial value
HPF_
X
FAST
0
0
D3
D2
HPF_FC[3:0]
0
0
D1
D0
R/W
HPFSEL
R/W
0
0
0x25
X
Initial value
FAST_GAIN[1:0]
0
0
FAST_FC[1:0]
0
0
HPF_FTIM[2:0]
R/W
0
0
0
Refer to “13.8.4. High-Pass Filter” and “13.8.5. Fast Track Mode” for details of these settings.
HPF_FAST: Fast Track Mode Setting
Set ON/OFF of the Fast Track Mode. In this mode, the cutoff frequency of HPF is switched to a higher
frequency temporary to convergent DC offset change that occurs when changing PGA gain in AGC
operation or when power down the receiving block.
0: Fast Track Mode OFF
1: Fast Track Mode ON
HPF_FC[3:0]: Digital High-Pass Filter Cutoff Frequency
Set the HPF cutoff frequency.
HPFSEL: High-Pass Filter ON/OFF Setting
Set ON/OFF of high-pass filter.
0: HPF OFF
1: HPF ON
*This bit must not be set to “1” when <Address 0x26> RDOC bit = “1” <Address 0x26>.
FAST_GAIN[1:0]: Gain Change Amount Setting for Fast Track Mode Trigger
Set PGA gain change amount for the trigger of Fast Track mode when <Address 0x24> {HPF_FAST} bit
= “1”. Fast Track mode will be enabled when PGA gain is changed more than the setting amount of this
register in a one AGC operation.
FAST_FC[1:0]: Cutoff Frequency Setting in Fast Track Mode
Set the higher cutoff frequency that is temporary used in Fast Track Mode.
HPF_FTIM[2:0]: Cutoff Frequency Switching Time in Fast Track Mode
Set the switching time of the cutoff frequency in Fast Track mode.
017003093-E-00
85
2017/3