Datasheet

Data Sheet AD7329
Rev. B | Page 21 of 40
This voltage is set up externally, and its range varies with reference
voltage. As the reference voltage increases, the common-mode
range decreases. When the differential inputs are driven with an
amplifier, the actual common-mode range is determined by the
amplifier’s output swing. If the differential inputs are not driven
from an amplifier, the common-mode range is determined by
the supply voltage on the V
DD
supply pin and the V
SS
supply pin.
When a conversion takes place, the common mode is rejected,
resulting in a noise-free signal of amplitude −2 × (4 × V
REF
) to +2 ×
(4 × V
REF
), corresponding to Digital Codes −4096 to +4095.
±16.5V V
DD
/V
SS
±12V V
DD
/V
SS
5
–6
V
COM
RANGE (V)
4
3
2
1
0
–1
–2
–3
–4
–5
V
CC
= 3V
V
REF
= 3V
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
05402-035
Figure 38. Common-Mode Range for V
CC
= 3 V and REF
IN
/REF
OUT
= 3 V
±16.5V V
DD
/V
SS
±12V V
DD
/V
SS
V
COM
RANGE (V)
V
CC
= 5V
V
REF
= 3V
8
–4
6
4
2
0
–2
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
05402-036
Figure 39. Common-Mode Range for V
CC
= 5 V and REF
IN
/REF
OUT
= 3 V
6
–8
4
2
0
–2
–4
–6
±16.5V V
DD
/V
SS
±12V V
DD
/V
SS
V
COM
RANGE (V)
V
CC
= 3V
V
REF
= 2.5V
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
05402-037
Figure 40. Common-Mode Range for V
CC
= 3 V and REF
IN
/REF
OUT
= 2.5 V
8
–8
6
4
2
0
–2
–4
–6
05402-038
±16.5V V
DD
/V
SS
±12V V
DD
/V
SS
V
COM
RANGE (V)
V
CC
= 5V
V
REF
= 2.5V
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
Figure 41. Common-Mode Range for V
CC
= 5 V and REF
IN
/REF
OUT
= 2.5 V