CH-X1500
1-30
SECTION 4
Description of major ICs
4.1 AK4381VT-X (IC121) : 2ch DAC
• Pin layout • Pin functions
• Block diagram
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Pin No Symbol Function
1 MCLK Master clock input pin
2 BICK Audio serial data clock pin
3 SDTI Audio serial data input pin
4 LRCK L/R clock pin
5 PDN Power-Down mode pin
6 CSN Chip select pin
7 CCLK Control data input pin
8 CDTI Control data input pin
9 AOUTR- Rch negative analog output pin
10 AOUTR+ Rch positive analog output pin
11 AOUTL- Lch negative analog output pin
12 AOUTL+ Lch positive analog output pin
13 VSS Ground pin
14 VDD Power supply pin
15 DZFR Rch data zero input detect pin
16 DZFL Lch data zero input detect pin
De-emphasis
Control
8X
Interpolator
uP
Interface
Audio
Data
Interface
CSN
CCLK
CDTI
LRCK
BICK
SDTI
PDN
8X
Interpolator
Modulator
SCF
SCF
Clock
Divider
VDD
VSS
DZFL
DZFR
MCLK
AOUTL+
AOUTR+
AOUTR-
AOUTL-
Modulator
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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