AK2400 Datasheet, PDF (25/52 Pages) Asahi Kasei Microsystems – High integrated receiver for PMR-LMR

[AK2400]
AGC_FAST : AGC control switching
0 : AGC control is operated with AGC response time described in AGC_TIME[1:0].
1 : The time constant of response time is changed by conditions that AGC1/AGC2 output level
converges between the upper limit and lower limit(convergence) or not(attack/release).
attack/release : AGC response time is the same as AGC_TIME=”00”.
convergence : AGC response time is set with ACG_TIME[1:0].
This setting provides the fast response time that can be followed the burst signal. (default)
AGC_TIME[1:0] : AGC response time setting
This register set response time for AGC1 gain and AGC2 gain to change by 1step.
AGC_TIME AGC_TIME
[1]
[0]
0
0
0
1
1
0
1
1
AGC response time [ms]
AGC1_STEP=0 setting
AGC1_STEP=1 setting
State A
(0.6)
(67)
(134)
(267)
State B
(8.5)
(95)
(182)
(355)
State C
(8.5)
(95)
(182)
(355)
State A
(0.4)
(34)
(67)
(134)
State B
(4.4)
(58)
(111)
(218)
State C
(4.4)
(58)
(111)
(218)
Note ) : Values above indicate response time during AGC gain changes from maximum to minimum
or from minimum to maximum.
State A: AGC1 output level is beyond the upper limit.
State B: AGC1 output level is within the upper limit and AGC2 output level is beyond the upper limit.
State C: AGC2 output level is under the lower limit.
AGC1_STEP : AGC1 gain switching range setting
0 : ±1dB
1 : ±2dB (default)
AGC_OFF : AGC ON/OFF setting
0 : ON (default)
1 : Off
BPF_BW[2:0] : BPF band width setting
BPF_BW BPF_BW BPF_BW
[2]
[1]
[0]
Name
1
0/1
0/1
F0
0
0
0
F1
0
0
1
F2
0
1
0
F3
0
1
1
F4
6dB attenuation
±7.5kHz
±6kHz
±4.5kHz
±3kHz
±2kHz
Attenuation
band width
±15kHz
(within 50dB)
±12.5kHz
(within 50dB)
±11kHz
(within 50dB)
±9kHz
(within 50dB)
±7kHz
(within 50dB)
Remarks
8dB attenuation
at F4 : ±2kHz
014008989-E-01
25
2015/4