Datasheet
Evaluation Board User Guide UG-442
Rev. C | Page 9 of 16
08230-005
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%
B
A
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
B
A
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
NOTES
1. PIN 18 IS LISTED AS NC IN THE AD5422 DATA SHEET AND CCOMP2 IN THIS SCHEMATIC. CONNECTING THE COMPENSATION CAPACITOR BETWEEN
PIN 17 AND PIN 18 OR PIN 17 AND PIN 21 HAS THE SAME EFFECT. NEW DESIGNS MUST FOLLOW THE AD5422 DATA SHEET RECOMMENDATIONS OF
INSERTING THE COMPENSATION CAPACITOR BETWEEN C
COMP
AND V
OUT
.
Figure 6. AD5422 TSSOP Evaluation Board Schematic of the AD5422 Circuitry