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
Содержание SA-AKX32LM-K
Страница 7: ...2 2 Precaution of Laser Diode Caution M 7 ...
Страница 13: ...13 5 Location of Controls and Components 5 1 Main Unit Key Button Operation ...
Страница 15: ...15 5 3 Media Information ...
Страница 25: ...25 7 2 2 Main P C B Fig 2 Main P C B Connector ZJ2007 Voltage Regulator IC IC2010 DC DC Converter IC IC2011 ...
Страница 26: ...26 7 2 3 D Amp P C B Fig 3 D Amp P C B Audio Digital Amp IC IC5900 ...
Страница 32: ...32 9 2 Main Components and P C B Locations ...
Страница 62: ...Step 9 Ground the 24P FFC with a short pin 62 ...
Страница 77: ...14 Simplified Block Diagram 14 1 Overall Simplified Block Diagram 77 ...
Страница 115: ...19 Terminal Function of ICs 19 1 IC2003 MN101EF16KXW IC MICRO PROCESSOR 115 ...
Страница 120: ...20 1 3 Mechanical Replacement Part List 120 ...
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Страница 122: ...20 2 Electrical Replacement Part List 122 ...