Datasheet

Evaluation Board User Guide UG-442
Rev. C | Page 11 of 16
08230-007
SOCKETED
REFIN
RED
SOCKETED
SOCKETED
2
FAULT
4
CLEAR_SELECT
5
CLEAR
6
LATCH
7
SCLK
8
SDIN
9
SDO
12
GND
13
GND
14
AVSS
15
GND
16
RSET
17
REFOUT
18
REFIN
23
DVCC_SELECT
24
CCOMP1
25
CCOMP2
26
IOUT
27
BOOST
32
VOUT
33
+VSENSE
34
-VSENSE
36
AVDD
37
AVSS
39
DVCC
28
CAP1
29
CAP2
3
GND
U1
AD5422
LK3
BA
LK4
J2-1
J2-2
J2-3
J3
C1
4nF
R1 15kΩ
R3
10kΩ
J4-1
J4-2
J4-3
Q1
R2
1kΩ
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
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
C52
C53
R27
LK18
+
C9 10µF
20%
C4 0.1µF
C7 10µF
C11 10µF
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 25 IS LISTED AS NC IN THE AD5422 DATA SHEET AND CCOMP2 IN THIS SCHEMATIC. CONNECTING THE COMPENSATION CAPACITOR BETWEEN
PIN 24 AND PIN 25 OR PIN 24 AND PIN 32 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 8. AD5422 LFCSP Evaluation Board Schematic of the AD5422 Circuitry