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AD7982 Datasheet(PDF) 11 Page - Analog Devices

Part No. AD7982
Description  18-bit, 1 MSPS PulSAR ADC in MSOP/QFN
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7982 Datasheet(HTML) 11 Page - Analog Devices

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Preliminary Technical Data
AD7982
Rev PrC | Page 11 of 23
Transfer Functions
The ideal transfer characteristic for the AD7982 is shown in
Figure 12 and Table 7.
100...000
100...001
100...010
011...101
011...110
011...111
ANALOG INPUT
+FS – 1.5 LSB
+FS – 1 LSB
–FS + 1 LSB
–FS
–FS + 0.5 LSB
Figure 12. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Description
Analog Input
VREF = 5 V
Digital Output Code Hexa
FSR – 1 LSB
+4.999962 V
1FFFF1
Midscale + 1 LSB
+38.15 μV
00001
Midscale
0 V
00000
Midscale – 1 LSB
−38.15 μV
3FFFF
–FSR + 1 LSB
−4.999962 V
20001
–FSR
−5 V
200002
1 This is also the code for an overranged analog input (VIN+ − VIN− above VREF
VGND).
2 This is also the code for an underranged analog input (VIN+ − VIN− below VGND).
TYPICAL CONNECTION DIAGRAM
Figure 13 shows an example of the recommended connection
diagram for the AD7982 when multiple supplies are available.
AD7982
REF
GND
VDD
IN–
IN+
VIO
SDI
SCK
SDO
CNV
3-WIRE INTERFACE
100nF
100nF
2.5V
10
μF2
V+
V+
V-
1.8V TO 5V
REF1
0 TO VREF
20
Ω
2.7nF
4
V+
V-
VREF TO 0
20
Ω
2.7nF
4
1SEE REFERENCE SECTION FOR REFERENCE SELECTION.
2CREF IS USUALLY A 10μF CERAMIC CAPACITOR (X5R).
3SEE DRIVER AMPLIFIER CHOICE SECTION.
4OPTIONAL FILTER. SEE ANALOG INPUT SECTION.
ADA4841-2 or
note 3
Figure 13. Typical Application Diagram with Multiple Supplies


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