D-Amp Ic Operation & Control - Panasonic SA-AKX72PH Service Manual

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
1
2
3
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:
Below is the logic for the two pins used for the control of the D-AMP IC.
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
For 10 KHz Step
Pin no Signal name
4 F_HOP
6 MODE_DA
3 MUTE_F
Table 1: Digital AMP Pin Control.
L(Low/OFF): Standby / OFF
H (High/ON): Operating or Mute
No MODE_DA MUTE_F
1 L
2 H
3 H
Table 2: Digital AMP IC Mode Status.
AM Band Frequency
522 ~ 558
567 ~ 639
648 ~ 855
864 ~ 945
954 ~ 1152
1161 ~ 1242
1251 ~ 1449
1458 ~ 1539
1548 ~ 1629
Table 3: F_HOP Control during 9 kHz Step
AM Band Frequency
520 ~ 560
570 ~640
650 ~ 860
870 ~ 950
960 ~ 1160
Function
Frequency Hop control.
Digital Amp On/Off control.
Digital Amp Muting control
Digital AMP IC mode status
X OFF (0V)
H Mute (2.5V)
L Operating(5V)
F_HOP Switching Frequency
L 301
H 350
L 301
H 350
L 301
H 350
L 301
H 350
L 301
F_HOP Switching Frequency
L 301
H 350
L 301
H 350
L 301
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