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AD7982 Datasheet(PDF) 15 Page - Analog Devices

Part No. AD7982
Description  18-Bit, 1 MSPS PulSAR 7 mW ADC in MSOP/LFCSP
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7982 Datasheet(HTML) 15 Page - Analog Devices

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AD7982
Data Sheet
Rev. D | Page 14 of 25
Transfer Functions
The ideal transfer characteristic for the AD7982 is shown in
Figure 22 and Table 8.
100...000
100...001
100...010
011...101
011...110
011...111
ANALOG INPUT
+FSR – 1.5 LSB
+FSR – 1 LSB
–FSR + 1 LSB
–FSR
–FSR + 0.5 LSB
Figure 22. ADC Ideal Transfer Function Characteristic
Table 8. Output Codes and Ideal Input Voltages
Description
Analog Input
VREF = 5 V
Digital Output
Code (Hex)
FSR – 1 LSB
+4.999962 V
0x1FFFF1
Midscale + 1 LSB
+38.15 μV
0x00001
Midscale
0 V
0x00000
Midscale – 1 LSB
−38.15 μV
0x3FFFF
–FSR + 1 LSB
−4.999962 V
0x20001
–FSR
−5 V
0x200002
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 23 shows an example of the recommended connection
diagram for the AD7982 when multiple supplies are available.
2.7nF
20Ω
V–
0 TO VREF
V+
4
2.7nF
20Ω
V–
VREF TO 0
V+
4
10µF2
REF1
REF
VDD
VIO
GND
IN+
IN–
SDI
SCK
SDO
CNV
AD7982
100nF
100nF
3-WIRE INTERFACE
2.5V
1.8V TO 5V
V+
ADA4807-12, 3
NOTES
1SEE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2CREF IS USUALLY A 10µF CERAMIC CAPACITOR (X5R).
SEE RECOMMENDED LAYOUT FIGURE 41 AND FIGURE 42.
3SEE DRIVER AMPLIFIER CHOICE SECTION.
4OPTIONAL FILTER. SEE ANALOG INPUT SECTION.
Figure 23. Typical Application Diagram with Multiple Supplies


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