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| 型号： | EVAL-AD7327SDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/37页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7327SDZ |
| 标准包装： | 1 |
| 系列： | * |
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AD7327
Rev. B | Page 20 of 36
±16.5V VDD/VSS
±12V VDD/VSS
5
–6
V
CO
M
R
ANG
E
(
V
)
4
3
2
1
0
–1
–2
–3
–4
–5
VCC =3V
VREF =3V
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
05
401-
045
Figure 35. Common-Mode Range for VCC = 3 V and REFIN/OUT = 3 V
±16.5V VDD/VSS
±12V VDD/VSS
V
CO
M
R
ANG
E
(
V
)
VCC =5V
VREF =3V
8
–4
6
4
2
0
–2
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
05
401-
046
Figure 36. Common-Mode Range for VCC = 5 V and REFIN/OUT = 3 V
6
–8
4
2
0
–2
–4
–6
±16.5V VDD/VSS
±12V VDD/VSS
V
CO
M
R
ANG
E
(
V
)
VCC =3V
VREF =2.5V
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
05
401-
047
Figure 37. Common-Mode Range for VCC = 3 V and REFIN/OUT = 2.5 V
8
–8
6
4
2
0
–2
–4
–6
±16.5V VDD/VSS
±12V VDD/VSS
V
CO
M
RANG
E
(
V
)
VCC =5V
VREF =2.5V
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
05
40
1-
0
48
Figure 38. Common-Mode Range for VCC = 5 V and REFIN/OUT = 2.5 V
Pseudo Differential Inputs
The AD7327 can have four pseudo differential pairs or seven
pseudo differential inputs referenced to a common VIN pin.
The VIN+ inputs are coupled to the signal source and must have
an amplitude within the selected range for that channel as
programmed in the range registers. A dc input is applied to the
VIN pin. The voltage applied to this input provides an offset for
the VIN+ input from ground or a pseudo ground. Pseudo
differential inputs separate the analog input signal ground from
the ADC ground, allowing cancellation of dc common mode
voltages.
When a conversion takes place, the pseudo ground corresponds
to Code 4096 and the maximum amplitude corresponds to
Code +4095.
AD73271
VIN+
V+
V–
VDD
VSS
VCC
5V
1ADDITIONAL PINS OMITTED FOR CLARITY.
VIN–
05
40
1-
0
28
Figure 39. Pseudo Differential Inputs
Figure 40 and Figure 41 show the typical voltage range on the
VIN pin for the different analog input ranges when configured
in the pseudo differential mode.
For example, when the AD7327 is configured to operate in
pseudo differential mode and the ±5 V range is selected, with
±16.5 V VDD/VSS supplies and 5 V VCC, the voltage on the VIN
pin can vary from 6.5 V to +6.5 V.
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