Datasheet
EVAL-AD7176-2SDZ User Guide UG-478
Rev. A | Page 9 of 40
Figure 6. Setup for the AD8656 Amplifiers
Table 5. R/C Values Used with AD8656 Amplifiers (Gain = 2)
U8 U12
Component Status Component Status
R65 0 Ω R107 0 Ω
R68 1 kΩ, 0.1% R109 1 kΩ, 0.1%
R72
1
0 Ω R110
2
0 Ω
R91 10 Ω R115 10 Ω
R92 1 kΩ, 0.1% R116 1 kΩ, 0.1%
R93 0 Ω R117 0 Ω
R99 1 kΩ, 0.1% R119 1 kΩ, 0.1%
R100
1
0 Ω R120
2
0 Ω
R105 10 Ω R125 10 Ω
R106 1 kΩ, 0.1% R126 1 kΩ, 0.1%
R34 0 Ω R46 0 Ω
R39 0 Ω R47 0 Ω
C19 270 pF C27 270 pF
C59 270 pF C28 270 pF
C23
680 pF
C26
680 pF
1
Remove R72 and R100 when connecting the ADA4940-1 to the AD7176-2.
2
Remove R110 and R120 when connecting the AD8475 to the AD7176-2.
0.1µF
+5V
R91
R92
R105
R72
R100
R34
R39
R65
R93
AD8656
R68
R106
R99
IN0
IN1
C19
C59
C23
0.1µF
R119
+5V
R126
R115
R110 R47
R125
R120 R46
R107
R117
AD8656
R116
R109
IN2
IN3
C28
C27
C26
3
REF+
2
REF–
21
AIN0
22
AIN1
23
AIN2
4
REFOUT
24
AIN3
6
AVSS
7
AVDD1
8
AVDD2
0.1µF
+5V
0.1µF 0.1µF
AD7176-2
+5V
0.1µF
4.7µF0.1µF
ADR445
*
5V VREF
0.1µF
*USING ADR444 (4.096V REFERENCE) IN PLACE OF
THE ADR445 ALLOWS THE ENTIRE CCT TO BE
OPERATED FROM A SINGLE +5V SUPPLY RAIL.
13
12
11
14
SCLK
DIN
CS
DOUT/RDY
11035-035