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AD7980 Datasheet(PDF) 11 Page - Analog Devices

Part No. AD7980
Description  16-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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AD7980 Datasheet(HTML) 11 Page - Analog Devices

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Preliminary Technical Data
AD7980
Rev Pr C | Page 11 of 22
Transfer Functions
The ideal transfer characteristic for the AD7980 is shown in
Figure 12 and Table 7.
000...000
000...001
000...010
111...101
111...110
111...111
ANALOG INPUT
+FSR – 1.5 LSB
+
FSR – 1 LSB
–FSR + 1 LSB
–FSR
–FSR + 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
4.999924 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 (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 AD7980 when multiple supplies are available.
AD7980
REF
GND
VDD
IN–
IN+
VIO
SDI
SCK
SDO
CNV
3- OR 4-WIRE INTERFACE5
100nF
100nF
2.5V
10
μF2
V+
V+
V-
1.8V TO 5V
REF1
0 TO VREF
15
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.
5SEE DIGITAL INTERFACE FOR MOST CONVENIENT INTERFACE MODE.
Figure 13. Typical Application Diagram with Multiple Supplies
ANALOG INPUT
Figure 14 shows an equivalent circuit of the input structure of
the AD7980.
The two diodes, D1 and D2, provide ESD protection for the
analog inputs IN+ and IN−. Care must be taken to ensure that
the analog input signal never exceeds the supply rails by more


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