UG-478 Datasheet, PDF (10/40 Pages) Analog Devices – Evaluation Board for the AD7176-2—24-Bit, 250 kSPS Sigma-Delta ADC with 20 μs Settling

UG-478
Evaluation Board User Guide
+5V
0.1µF
ADA4940-1
R66
R96
IN0
R96
R77
R75
IN1
R97
VOCM
R98
+5V
0.1µF
+IN 0.4×
IN2
R63
VOCM
R64
–IN 0.4×
IN3
R74
R78
AD8475
R34
C19
C59
R39
+5V
0.1µF
6
7
8
AVSS AVDD1 AVDD2
21 AIN0
C23
22 AIN1
0.1µF
AD7176-2
2.5V
0.1µF
4 REFOUT
R47
C28
C27
R46
23 AIN2
C26
24 AIN3
REF+
3
SCLK 13
DIN 12
DOUT/RDY ¹¹
CS ¹⁴
REF–
2
+5V
0.1µF
ADR445
5V VREF
0.1µF
0.1µF
4.7µF
Figure 7. Setup for the ADA4940-1 and AD8475 Amplifiers
Table 6. R/C Components for ADA4940-1 (Single-Ended to Differential Driver)
Component
Status
R66
0Ω
R75
0Ω
R76
0Ω
R77
0Ω
R96 ¹
Not inserted
R97¹
Not inserted
R98
0Ω
R34
0Ω
R39
0Ω
C19
270 pF
C59
270 pF
C23
680 pF
1 _{Insert 0 Ω resistors in R96 and R97 to connect the ADA4940-1 to the AD7176-2, and place the SL8 and SL11 solder links in Position C. Ensure that the R72 and R100}
resistors are removed.
Table 7. R/C Components for AD8475 (Attenuating Single-Ended to Differential Driver)
Component
Status
R63
0Ω
R64 ¹
Not inserted
R74¹
Not inserted
R78
0Ω
R46
0Ω
R47
0Ω
C27
270 pF
C28
270 pF
C26
680 pF
1 _{Populate R64 and R74 with 10 Ω resistors to connect the AD8475 to the AD7176-2, and place the SL9 and SL10 solder links in Position C. Ensure that the R110 and R120}
resistors are removed.
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