AD9020
+5V
ANALOG
INPUT
+V
SENSE
150⍀
AD9020
1/2
AD708
+V
REF
0.1F
+1.75V
+V
SENSE
R/2
R1
10k⍀
3/4
REF
R
R
R
+0.875V
S
R/2
R/2
1/2
3/4
REF
S
AD708
0.1F
1/2
1/4
REF
REF
R2
10k⍀
R
R
R
R
0V
S
R/2
R/2
R
1/2
1/2
REF
+2.5V
AD708
S
0.1F
1.75V
AD580
150⍀
356⍀
R3
10k⍀
R
–0.875V
–V
SENSE
R/2
1/2
1/4
REF
AD708
R/2
R
0.1F
R4
10k⍀
Figure 6. Equivalent Analog Input
+V
S
R
R
20k⍀
R/2
20k⍀
–V
SENSE
DIGITAL BITS
AND OVERFLOW
–1.75V
–V
REF
150⍀
1/2
AD708
0.1F
= WIRING
RESISTANCE = < 5⍀
–5V
Figure 5. Reference Circuit
Figure 7. Equivalent Digital Outputs
5.0V
13k⍀
ENCODE
Figure 8. Equivalent Encode Circuit
REV. C
–9–