27
7.3.
D-Amp IC Operation & Control
D-AMP IC Operation & Control
1)
D-AMP IC (C1AB00000497) was used for this model.
2)
Three control pins (signal send from micro-processor IC) were used to control the D-AMP IC
operation such as muting, standby and normal operation. They are described as below: -
No Pin no
Signal name
Function
1 4
F_HOP
Frequency
Hop
control.
2
6
MODE_DA
Digital Amp On/Off control.
3
3
MUTE_F
Digital Amp Muting control
Table 1: Digital AMP Pin Control.
Here is detailed description of the three control pins for the D-AMP IC
A)
MODE_DA
&
MUTE_F
were used to switch the D-AMP IC in the following muting status:
x
L(Low/OFF): Standby / OFF
x
H (High/ON): Operating or Mute
Below is the logic for the two pins used for the control of the D-AMP IC.
No
MODE_DA MUTE_F
Digital AMP IC mode status
1 L
X
OFF
(0V)
2 H
H
Mute
(2.5V)
3 H
L
Operating(5V)
Table 2:
Digital AMP IC Mode Status.
Note: Standby/OFF condition of D.AMP IC is available / activated only during the following
event: Switching of Frequency Hoping, power off and start up (when the unit is undergoing
the transition from standby to normal operation mode)
B)
F_HOP
is used to control the D-AMP operation to avoid interference with AM source by
controlling the frequency source used. It will switch from one frequency to the other, depending on
the tuned AM frequency.
For 9 KHz Step
AM Band Frequency F_HOP Switching Frequency
522 ~ 558
L
301
567 ~ 639
H
350
648 ~ 855
L
301
864 ~ 945
H
350
954 ~ 1152
L
301
1161 ~ 1242
H
350
1251 ~ 1449
L
301
1458 ~ 1539
H
350
1548 ~ 1629
L
301
Table 3: F_HOP Control during 9 kHz Step
For 10 KHz Step
AM Band Frequency F_HOP Switching Frequency
520 ~ 560
L
301
570 ~640
H
350
650 ~ 860
L
301
870 ~ 950
H
350
960 ~ 1160
L
301
Summary of Contents for SA-AKX52
Page 13: ...13 5 Location of Controls and Components 5 1 Main Unit Key Button Operation ...
Page 14: ...14 5 2 Remote Control Key Button Operation ...
Page 32: ...32 9 2 Main Components and P C B Locations ...
Page 66: ...66 Step 9 Ground the 24P FFC with a short pin ...
Page 81: ...81 14 Simplified Block Diagram 14 1 Overall Simplified Block Diagram ...
Page 92: ...92 ...
Page 128: ...128 ...
Page 143: ...143 MMH1103 ...