Analog Circuit - Panasonic KX-DT543-B Service Manual

KX-DT543/KX-DT543-B/KX-DT546/KX-DT546-B
4.2.5.

Analog Circuit

1. Speaker phone call
Transmitting signal is input from microphone  input to IC410-pin 33 and 34  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 38 and 40  output to Speaker.
IC410
DCX81
38
SPOUTP
SPAMPEN
SPP
SPN
40
SPOUTN
34
MIP
AGND
33
MIN
MIP
AGND
2. Handset call
Transmitting signal is input from handset microphone  input to IC410-pin 35 and 36  amplified by a built-in analog ampli-
fier 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 41  output to handset speaker.
IC410
DCX81
36
HSMIP
HSMICINP
AGND
35
HSMIN
AGND
41
HSSPOUTP
AGND
R501 SPP
DG DG
DG
R502 SPN
DG
D G D
MICBIAS
C569
AGND
R530 R532 MIP
C540
AGND
DG
AGND
R531 R533 MIN
C541
DG
AGND
AGND AGND
MICBIAS
C570
L463
AGND
R515 R517
C513
AGND
AGND
L464
R516 R518
C514
AGND
AGND
AGND
L465
C519
C520
SP1
SP2
G
MIC1
MIC2
HSMIP
DG
HSSPOUT
Handset Jack
1
2
R568
3
4
DG
JK501
HSMIN
R574
AGND
DG
DG
10
5
DG