Asic (Ic300) - Panasonic KX-DT543-B Service Manual

3. Headset Call
Transmitting signal is input from headset microphone  input to IC410-pin 26  amplified by a built-in analog amplifier of
IC410  A/D conversion, Gain adjustment and echo cancel by a built-in DSP of IC410.
Receiving signal is sent by data from PBX  Gain adjustment and D/A conversion by a built-in DSP of IC410  amplified by
a built-in analog amplifier of IC410  output from IC410-pin 42  output to headset speaker.
Ope PCB
JK160
1
2 HEADGND HEADGND
3
4
5
HEADGND HEADGND HEADGND HEADGND
4.2.6.

ASIC (IC300)

IC300 controls Data Communication (refer to chapter 4.2.3) between PBX and proprietary telephone, and DXDP Communication
(refer to chapter 4.2.4) .
IC410 controls IC300 with SPI (Serial peripheral interface).
PCM signal (encoded audio signal) is exhanged between IC300 and IC410.
CN160
13
12
L160
D162
AGND
L161
D161 L162
AGND AGND
AGND HEADGND
Main PCB
MICBIAS
CN400
C571
AGND
HESMIN
L461
R570
2
C580
AGND
L462
3
HESSPOUT
AGND AGND
IC150
L163
R161
6
GKEYIN0
D163
ASIC2
HEADGND
AGND
11
KX-DT543/KX-DT543-B/KX-DT546/KX-DT546-B
IC410
DCX81
26
LIN0
AGND
DG
42
LOUT