EVAL-AD7983SDZ View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-AD7983SDZ' PDF : 24 Pages View PDF
AD7983
Transfer Functions
The ideal transfer characteristic for the AD7983 is shown in
Figure 21 and Table 9.
111 ... 111
111 ... 110
111 ... 101
000 ... 010
000 ... 001
000 ... 000
–FSR –FSR + 1LSB
–FSR + 0.5LSB
+FSR – 1 LSB
+FSR – 1.5 LSB
ANALOG INPUT
Figure 21. ADC Ideal Transfer Function
Data Sheet
Table 9. Output Codes and Ideal Input Voltages
Analog Input
Description
VREF = 5 V
Digital Output Code (Hex)
FSR − 1 LSB
4.999924 V
FFFF1
Midscale + 1 LSB 2.500076 V
8001
Midscale
2.5 V
8000
Midscale − 1 LSB 2.499924 V
7FFF
−FSR + 1 LSB
76.3 µV
0001
−FSR
0V
00002
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 22 shows an example of the recommended connection
diagram for the AD7983 when multiple supplies are available.
0 TO VREF
V+
V+
REF1
10µF2
3
V–
20Ω
2.7nF
4
REF
IN+
VDD
VIO SDI
SCK
AD7983
SDO
IN–
GND
CNV
2.5V
100nF
1.8V TO 5V
100nF
3- OR 4-WIRE INTERFACE5
1SEE THE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2CREF IS USUALLY A 10µF CERAMIC CAPACITOR (X5R).
3SEE THE DRIVER AMPLIFIER CHOICE SECTION.
4RECOMMENDED FILTER CONFIGURATION. SEE THE ANALOG INPUTS SECTION.
5SEE THE DIGITAL INTERFACE SECTION FOR THE MOST CONVENIENT INTERFACE MODE.
Figure 22. Typical Application Diagram with Multiple Supplies
Rev. C | Page 14 of 25
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