AK2401 Datasheet, PDF (58/103 Pages) Asahi Kasei Microsystems – Direct Conversion Transceiver

[AK2401]
DC Offset Calibration Time for Digital Block (CAL Time(2))
A DC offset calibration is executed at the channel filter and the AGC blocks at the same time in digital
block. In this case, the calibration time (CAL Time (2)) will be longer period if only the channel filter block
is calibrated (OFSCAL3 bit) or both channel filter and AGC blocks (OFSCAL2 or OFSCAL3 bit and
OFSCAL4 bit) are calibrated. When only the AGC block is calibrated (OFSCAL4 bit), the calibration time
(CAL Time (2)) will be the AGC calibration time.
Calibration Time for Digital Block (Channel Filter)
The calibration time of channel filter block will be different according to the filter that is selected by
DFIL_SEL[2:0] bits <Address 0x22>. The calibration times (CAL Time(2)) when using 18.432MHz or
19.2MHz reference clock are shown below.
Table 9. Calibration Time for Digital Block (Channel Filter)
Filter Selected by
DFIL_SEL[3:0] bits
CHOFS_AVE
[1]
[0]
CAL Time(2)
18.432MHz 19.2MHz
0
0
1.9 (default) 1.9 (default)
F0 ~ F3
0
1
2.4
2.4
1
0
3.3
3.2
1
1
5.1
4.9
0
0
2.4 (default) 2.4 (default)
F4 ~ F8
0
1
3.3
3.2
1
0
5.1
4.9
1
1
8.6
8.3
0
0
3.3 (default) 3.2 (default)
0
1
5.1
4.9
F9
1
0
8.6
8.3
1
1
15.7
15.2
Unit
msec
Calibration Time for Digital Block (AGC)
The calibration times (CAL Time(2)) of AGC block when using 18.432MHz or 19.2MHz reference clock
are shown below.
Table 10. Calibration Time for Digital Block (AGC)
AGCOFS_AVE
CAL Time(2)
[1]
[0]
18.432MHz
19.2MHz
Unit
0
0
131 (default) 127 (default)
0
1
242
1
0
464
233
µsec
447
1
1
909
873
017003093-E-00
58
2017/3