AK2401 Datasheet, PDF (68/103 Pages) Asahi Kasei Microsystems – Direct Conversion Transceiver

[AK2401]
13.8.11. Output Sampling Rate
F0 ~ F9 channel filters operate with different frequency depending on the filter passband. Therefore the
output sampling rates of these filters are different. By setting DFIL_SR[1:0] bits <Address 0x22>, the
sampling rate of F0~F9 filters can be set to half or quarter rate of the original. The output sampling rate of
each filter is shown below.
Signals will be output with the settings indicated as “Do not use” but their characteristics are not excellent
because of aliasing noises.
Filter
F0
F1
F2
F3
F4
F5
F6
F7
F8
F9
Programmable
FIR Filter
DFIL_
DFIL_SEL
PROG _{[3] [2] [1] [0]}
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
1
1
0
0
1
0
0
0
0
1
0
1
0
0
1
1
0
0
0
1
1
1
0
1
0
0
0
0
1
0
0
1
0
…
0
1
1
1
1
1
0
0
0
0
1
0
0
0
1
1
0
0
1
0
1
0
0
1
1
1
0
1
0
0
1
0
1
0
1
1
0
1
1
0
1
0
1
1
1
1
1
0
0
0
1
1
0
0
1
1
…
1
1
1
1
1
Output Sampling Rate
DFIL_SR=00
(default)
DFIL_SR=01
(1/2 rate)
DFIL_SR=1X
(1/4 rate)
TCXO/128
Do Not Use
Do Not Use
TCXO/128
Do Not Use
Do Not Use
TCXO/128
Do Not Use
Do Not Use
TCXO/128
Do Not Use
Do Not Use
TCXO/256
TCXO/512
TCXO/1024
TCXO/256
TCXO/512
TCXO/1024
TCXO/256
TCXO/512
TCXO/1024
TCXO/256
TCXO/512
TCXO/1024
TCXO/256
TCXO/512
TCXO/1024
TCXO/512
TCXO/1024
TCXO/2048
TCXO/128
TCXO/128
TCXO/128
TCXO/128
TCXO/256
TCXO/256
TCXO/256
TCXO/256
TCXO/256
TCXO/512
Do Not Use
Do Not Use
Do Not Use
Do Not Use
TCXO/512
TCXO/512
TCXO/512
TCXO/512
TCXO/512
TCXO/1024
Do Not Use
Do Not Use
Do Not Use
Do Not Use
TCXO/1024
TCXO/1024
TCXO/1024
TCXO/1024
TCXO/1024
TCXO/2048
017003093-E-00
68
2017/3