UG-441 Evaluation Board User Guide
Rev. D | Page 8 of 12
SOCKETED
REFIN
C4,C5,C8,C9 MUST BE RATED OVER 60V
C6,C7,C10,C11 MUST BE RATED OVER 30V
THE FOLLOWING COMPONENTS ARE NOT TO BE POPULATED :
C12, C14, C17, C52, C53, R27
RED
SOCKETED
LK3
BA
LK4
J2-1
J2-2
J2-3
J3
C1
4nF
R1 15kΩ
R3
10kΩ
J4-1
J4-2
J4-3
Q1
R21kΩ
LK10
J5-1
J5-2
LK11
LK12
C3
22nF
+
C5
10µF
20%
C6
0.1µF
C8
0.1µF
C10
0.1µF
C13
0.1µF
C15
0.1µF
+
C16
1µF
20%
R4
0Ω
R5
0Ω
R6
0Ω
R7
0Ω
R8
0Ω
R9
0Ω
R10
0Ω
TP1 TP2 TP3 TP4 TP5 TP6 TP7
C12
C14
C17
R11
51Ω
C35
0.1µF
+
C36
10µF
20%
BA
LK5
LK13
LK14
J6-1
J6-2
+
C37
10µF
20%
+
C38
10µF
20%
C39
0.1µF
C40
0.1µF
2
+VIN
5
TRIM
6
VOUT
4
GND
U2
ADR435
A
B
C
LK15
C41
0.1µF
+
C42
10µF
20%
BA
LK9
1
CS
2
DIN
3
DGND
4
AGND
5
REFIN/OUT
6
VSS
7
VIN0
8
VIN1
9
VDD
10
VCC
11
VDRIVE
12
DOUT
13
DGND
14
SCLK
U6
AD7321
BA
LK16
C43
0.1µF
C44 0.1µF
+
C45 10µF
20%
+
C46 10µF
20%
TP8
TP9
TP10
TP11
3
+
2
–
4
V–
7
V+
6
U9
AD820
R12
5.6kΩ
R13
39kΩ
C47
0.1µF
C48 0.1µF
+
C49
10µF
20%
+
C50
10µF
20%
C51
680nF
R14
10kΩ
R15
4.7kΩ
J9-1
J10-1
J11-1
J12-1
J13-1
LK17
D2
R26
1kΩ
R27
LK18
+
C9
10µF
20%
C4
0.1µF
C7
10µF
C11
10µF
1
AVSS
2
DVCC
3
FAULT
5
CLEAR_SELECT
6
CLEAR
7
LATCH
8
SCLK
9
SDIN
10
SDO
11
GND
12
GND
13
RSET
14
REFOUT
15
REFIN
16
DVCC_SELECT
17
CCOMP1
18
CCOMP2
19
IOUT
20
BOOST
21
VOUT
22
+VSENSE
23
–VSENSE
24
AVDD
4
GND
U1
AD5422_TSSOP
X1
CLAMP-SOIC-TSSOP
FAULT
CLEAR_SELECT
CLEAR
LATCH
SCLK
SDIN
SDO
AVSS
AVDD
DVCC
AVDD
DVCC
DGND
DGND
DVCC
VIN0
V+
V–
AVDD
V+
VIN0
CS_ADC
SDIN_ADC
SCLK_ADC
DOUT_ADC
DGND
AVSS
V–
DGND
AVSS
+VSENSE
VOUT
–VSENSE
IOUT
GND
V+
V–
AVDD
AVSS
AGND
08160-005
Figure 6. Schematic of the AD5420 Circuitry
