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AD7329 Datasheet(PDF) 21 Page - Analog Devices

Part No. AD7329
Description  1 MSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
Download  40 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7329 Datasheet(HTML) 21 Page - Analog Devices

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AD7329
Rev. 0 | 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 driving the differential
inputs 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 VDD supply pin
and the VSS supply pin.
When a conversion takes place, the common mode is rejected,
resulting in a noise-free signal of amplitude −2 × (4 × VREF) to +2 ×
(4 × VREF), corresponding to Digital Codes −4096 to +4095.
±16.5V VDD/VSS
±12V VDD/VSS
5
–6
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
Figure 38. Common-Mode Range for VCC = 3 V and REFIN/REFOUT = 3 V
±16.5V VDD/VSS
±12V VDD/VSS
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
Figure 39. Common-Mode Range for VCC = 5 V and REFIN/REFOUT = 3 V
6
–8
4
2
0
–2
–4
–6
±16.5V VDD/VSS
±12V VDD/VSS
VCC = 3V
VREF = 2.5V
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
Figure 40. Common-Mode Range for VCC = 3 V and REFIN/REFOUT = 2.5 V
8
–8
6
4
2
0
–2
–4
–6
±16.5V VDD/VSS
±12V VDD/VSS
VCC = 5V
VREF = 2.5V
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
Figure 41. Common-Mode Range for VCC = 5 V and REFIN/REFOUT = 2.5 V


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