AK2401 Datasheet, PDF (81/103 Pages) Asahi Kasei Microsystems – Direct Conversion Transceiver

[AK2401]
AGCTIM[2:0]: Calculation/Detection Time Setting of Signal Power
Set signal power calculation/detection time of AGC. The power calculation/detection time is calculated
by the equation shown below. Power calculation/detection times in the case of using 18.432MHz and
19.2MHz reference clocks are shown in the table below.
Power Calculation/Detection Time = Reference Clock Cycle × 2048 ×2^N
*N: AGCTIM bits Setting Value
AGCTIM
[2]
[1]
[0]
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Power Calculation/Detection Time
18.432MHz
19.2MHz
0.11
0.11
0.22
0.21
0.44
0.43
0.89 (default) 0.85 (default)
1.79
1.71
3.56
3.41
7.11
6.83
14.22
13.65
Unit
msec
AGCHYS[1:0]: Hysteresis Width of Signal Power Convergence Level
AGC (Automatic Gain Control) stops gain controlling when the current receiving level is within the range
of this setting (convergence detection level) against the AGC convergence target level set by
AGCTGT[2:0] bits <Address 0x20>.
AGCHYS
[1]
[0]
0
0
0
1
1
0
1
1
Convergence
Detection Level
Unit
< ±1 (default)
< ±2
dB
< ±4
< ±8
AGC_KEEP_SEL: Control Method Setting for the AGC_KEEP Function
This bit selects register or pin control of the AGC_KEEP function.
0: Control by AGC_KEEPR bit
1: Control by the AGC_KEEP pin
AGC_KEEPR: ON/OFF Setting of the AGC KEEP Function
Set ON/OFF of the AGC KEEP function. This setting will only be valid when setting AGC_KEEP_SEL bit
= “0” <Address 0x1F>
0: AGC KEEP Function OFF
1: AGC KEEP Function ON
AGCKP_MODE bit <Address 0x21> controls operation of the AGC KEEP function.
AGCOFF: ON/OFF Setting of AGC (Automatic Gain Control) Function
Set ON/OFF of the AGC function. AGC is performed in PGA and LNA blocks. LNA gain control can be
applied to PGA by setting LNA_AGCOFF bit = “0” <Address0x20> when AGCOFF bit= “0”. Normally
AGCOFF bit should be set to “0”.
0: AGC Function ON
1: AGC Function OFF
017003093-E-00
81
2017/3