DVDD33
SW1
SPI_CSb
2
74HC14
74HC14
3
10
74HC14
5
8
74HC14
1
U8
2
3
74HC125
R17 10K
R0805
1
SW2
U9
11
U9
R12
7.5K
3
2
12
13
U9
1
R0805
U9
R11
7.5K
SPI_CLK
2
74HC14
6
9
74HC14
DVDD33
1
SW3
U9
U9
3
4
R0805
P1
R13
7.5K
R0805
1
2
3
4
5
6
L7
10UH
L1210
SPI_SDI
2
SW4
3
2
1
3
SPI_SDO
1
U1
1
U8
11
12
13
3
2
74HC125
U8
8
U1
R0805
R0805
10
9
74HC125
6
R26
10K
74HC125
4
U8
5
R0805
R0805
R0805
DVDD33
C9
0.1UF
C0402
DVDD33
C10
0.1UF
C0402
06936-078
图75. SPI接口
版本A |第31页36
SW5
1
2
5
R27
10K
3
6
4
DVDD33
DVDD33
2
RST
GND
VCC
MR
RESET
R14
20K
R15
20K
R16
20K
A1
3
2
1
SW6
4
3
14
U1
7
1
4
AD9780/AD9781/AD9783
C0402
C51
0.1UF
DVDD33
