AK2365A Datasheet, PDF (20/33 Pages) Asahi Kasei Microsystems – FM IF Detector with Narrow Band Filter

[AK2365A]
LOFREQ[1:0]: Local frequency setting
LOFREQ
[1]
LOFREQ
[0]
Local frequency
0
0
45.9MHz
0
1
50.4MHz
1
0
57.6MHz
Note: Do no set the combination of the code which is not defined in the table given above.
Address 0x02 (Control Register 2)
Name
D7(MSB)
Control Register 2 Reserved
Initial Value
0
D6
AGC_
KEEP
0
D5
AGC_
FAST
1
D4
Reserved
1
D3
D2
AGC_TIME[1:0]
0
0
D1 D0(LSB)
AGC1_S
TEP
CAL
1
0
AGC_KEEP : The function of AGC1/2 gain keeping
When the AGC function is active, the gain setting of AGC1/2 is kept during
AGC_KEEP=”1”.On the other hand, the gain setting of AGC1/2 is changed by IFIP
signal during AGC_KEEP=”0”.
0: The gain setting of AGC1/2 is changed by IFIP signal. (default)
1: The gain setting of AGC1/2 is kept.
Note: When setting the operation mode 4,5,6,7, AGC_KEEP is available.
AGC_FAST : AGC control switching
0：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[1:0]=”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.
(recommended)
1：AGC control is operated with AGC response time described in AGC_TIME[1:0]. (default)
Note : The response speed of AGC must be set to AGC_FAST=0, AGC_TIME[1:0]=”11”,
AGC1_STEP=0. ACS (Adjacent Channel Selectivity) performance is optimized by preventing
the periodic operation due to a strong unwanted signal.
MS1591-E-03
- 20 -
2015/4