EVAL-CONTROLBRD AD [Analog Devices], EVAL-CONTROLBRD Datasheet - Page 13

• Manufacturer Part Number: EVAL-CONTROLBRD
• Description: 16-Bit, 1.33 MSPS PulSAR ADC in MSOP/QFN
• Manufacturer: AD [Analog Devices]

Transfer Functions
The ideal transfer characteristic for the AD7983 is shown in
Figure 22 and Table 7.
000 ... 010
000 ... 001
000 ... 000
111 ... 101
111 ... 110
111 ... 111
–FSR
–FSR + 0.5LSB
0 TO VREF
1
2
3
4
5
SEE THE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
C
SEE THE DRIVER AMPLIFIER CHOICE SECTION.
OPTIONAL FILTER. SEE THE ANALOG INPUTS SECTION.
SEE THE DIGITAL INTERFACE SECTION FOR THE MOST CONVENIENT INTERFACE MODE.
REF
Figure 22. ADC Ideal Transfer Function
–FSR + 1LSB
IS USUALLY A 10µF CERAMIC CAPACITOR (X5R).
V+
V–
ANALOG INPUT
V+
+FSR – 1.5 LSB
4
REF
20Ω
Figure 23. Typical Application Diagram with Multiple Supplies
2.7nF
1
+FSR – 1 LSB
10µF
2
Rev. 0 | Page 13 of 24
IN–
IN+
GND
REF
AD7983
Table 7. Output Codes and Ideal Input Voltages
Description
FSR − 1 LSB
Midscale + 1 LSB
Midscale
Midscale − 1 LSB
−FSR + 1 LSB
−FSR
1
2
TYPICAL CONNECTION DIAGRAM
Figure 23 shows an example of the recommended connection
diagram for the AD7983 when multiple supplies are available.
VDD
This is also the code for an underranged analog input (V
This is also the code for an overranged analog input (V
VIO
SDO
SCK
CNV
SDI
V
4.999924 V
2.500076 V
2.5 V
2.499924 V
76.3 μV
0 V
100nF
100nF
REF
= 5 V
2.5V
1.8V TO 5V
3- OR 4-WIRE INTERFACE
Analog Input
Digital Output Code (Hex)
FFFF
8001
8000
7FFF
0001
0000
1
2
IN+
− V
IN+
IN−
− V
above V
IN−
AD7983
below V
REF
− V
GND
GND
).
).