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3. TECHNICAL BRIEF
- 66 -
Audio part schematics
REV_C : 20K --> 3K
Audio AMP
REV_E : For Antenna Radiation
5.6KR430
C423
C428
1u
0.1u
R427 1K
R429 1K
C431
NA
C422 0.1u
2
4
INM
INP
3
OUTA
5
8
OUTB
VM
7
VP
6
1
_SD
NCP2890DMR2
U402
BYPASS
5600p
C426
RCVP
10u
C425
C4291000p
R4285.6K
RCVN
C430
1000p
R426
20K
100nHL402
L401
100nH
C4275600p
R431
20K
SPK_RCV+
SPK_RCV-
LINE_P
LINE_N
+VPWR
SPK+
SPK_AMP_EN
SPK-