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AD7988-1_1208 Datasheet(PDF) 15 Page - Analog Devices

Part No. AD7988-1_1208
Description  16-Bit Lower Power PulSAR ADCs in MSOP/LFCSP (QFN)
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7988-1_1208 Datasheet(HTML) 15 Page - Analog Devices

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Data Sheet
AD7988-1/AD7988-5
Rev. C | Page 15 of 24
Transfer Functions
The ideal transfer characteristic for the AD7988-x is shown in
Figure 30 and Table 7.
000 ... 000
000 ... 001
000 ... 010
111 ... 101
111 ... 110
111 ... 111
–FSR
–FSR + 1LSB
–FSR + 0.5LSB
+FSR – 1 LSB
+FSR – 1.5 LSB
ANALOG INPUT
Figure 30. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Analog Input
Description
V
REF = 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
0 V
00002
1 This is also the code for an overranged analog input (V
IN+ − VIN− above VREF − VGND).
2 This is also the code for an underranged analog input (V
IN+ − VIN− below VGND).
TYPICAL CONNECTION DIAGRAM
Figure 31 shows an example of the recommended connection
diagram for the AD7988-x when multiple supplies are available.
AD7988-1/
AD7988-5
2.5V
V+
20Ω
V+
V–
0V TO VREF
1.8V TO 5.5V
100nF
10µF2
2.7nF
4
3
100nF
REF
IN+
IN–
VDD
VIO
GND
3- OR 4-WIRE INTERFACE5
REF1
1 SEE THE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2 CREF IS USUALLY A 10µF CERAMIC CAPACITOR (X5R).
3 SEE THE DRIVER AMPLIFIER CHOICE SECTION.
4 OPTIONAL FILTER. SEE THE ANALOG INPUTS SECTION.
5 SEE THE DIGITAL INTERFACE SECTION FOR THE MOST CONVENIENT INTERFACE MODE.
CNV
SCK
SDO
SDI
Figure 31. Typical Application Diagram with Multiple Supplies


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