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AD7329 Datasheet(PDF) 22 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) 22 Page - Analog Devices

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AD7329
Rev. 0 | Page 22 of 40
Pseudo Differential Inputs
The AD7329 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 register. 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 pseudo ground. Pseudo differential
inputs separate the analog input signal ground from the ADC
ground, allowing cancellation of dc common-mode voltages.
Figure 42 shows the configuration of the AD7329 in pseudo
differential mode.
When a conversion takes place, the pseudo ground corresponds
to Code −4096 and the maximum amplitude corresponds to
Code +4095.
AD73291
VIN+
V+
V–
VDD
VSS
VCC
5V
1ADDITIONAL PINS OMITTED FOR CLARITY.
VIN
Figure 42. Pseudo Differential Inputs
Figure 43 and Figure 44 show the typical voltage range on the
VIN− pin for various analog input ranges when configured in
the pseudo differential mode.
For example, when the AD7329 is configured to operate in
pseudo differential mode and the ±5 V range is selected with
16.5 V VDD, −16.5 V VSS, and 5 V VCC, the voltage on the VIN
pin can vary from −6.5 V to +6.5 V.
8
–8
6
4
2
0
–2
–4
–6
±2.5V
RANGE
±10V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
0V TO +10V
RANGE
0V TO +10V
RANGE
±16.5V VDD/VSS
±12V VDD/VSS
VCC = 5V
VREF = 2.5V
Figure 43. Pseudo Input Range with VCC = 5 V
±2.5V
RANGE
±10V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
0V TO +10V
RANGE
0V TO +10V
RANGE
±16.5V VDD/VSS
±12V VDD/VSS
4
–8
2
0
–2
–4
–6
VCC = 3V
VREF = 2.5V
Figure 44. Pseudo Input Range with VCC = 3 V


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