Download ADN2850 Evaluation Kit User Manual Application

AN-628
APPLICATIONS
U1
ADN2850
1
3
4
5
VI
R1
6
A RDAC B
7
8
16
RDY
CS
PR
WP
VDD
A2*
W2
B2
CLK
SDI
SDO
GND
VSS
A1*
W1
B1
2
15
14
13
12
–INPUT
VO
11
1
1
9
+5 (+2.5V)
R1
JP6
JP15
–5 (–2.5V)
–RWB
R1
VO =
VI = 0.1V
R1 = 5k, RAB = 10k
10
VO
G=
0V
6
U3
AD820AR
3 +
1
–VI (D RAB)
(2n R1)
–200mV
–
JP4
VI_DC
1, 5, 8
7
2
0
0.5
1.0
V(VO)
VO
POTSETTING
4
JP1
JP12
–5 (–2.5V)
Figure 4. Inverting Linear Gain and Attenuator
FB
U1
ADN2850
2
3
4
5
VI
A RDAC B
6
R2
7
8
1
RDY
CS
PR
WP
VDD
A2*
W2
B2
CLK
SDI
SDO
GND
VSS
A1*
W1
B1
16
15
14
13
–INPUT
VO
12
1
1
10
9
JP8
+5 (+2.5V)
JP4
VI_DC
2
1
JP3
VI_AC
C9
1, 5, 8
7
–100mV
–
U3
AD820AR
–5 (–2.5V)
G = –R2
RWA
–VI (2n R2)
VO =
(2n –D) RAB
VI = 0.1V
RAB = 10k, R2 = 10k
R2
VO
JP15
–10V
11
LOG
1
3 +
1
JP1
6
VO
4
JP12
–5 (–2.5V)
Figure 5. Inverting Exponential Gain and Attenuator
REV. 0
–9–
0
0.5
V(VO)
POTSETTING
1.0