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EVAL-SDP-CB1Z View Datasheet(PDF) - Analog Devices

Part Name
Description
MFG CO.
EVAL-SDP-CB1Z
ADI
Analog Devices ADI
'EVAL-SDP-CB1Z' PDF : 28 Pages View PDF
AD7685
Transfer Functions
The ideal transfer characteristic for the AD7685 is shown in
Figure 26 and Table 8.
111...111
111...110
111...101
TYPICAL CONNECTION DIAGRAM
Figure 27 shows an example of the recommended connection
diagram for the AD7685 when multiple supplies are available.
000...010
000...001
000...000
–FS
–FS + 1 LSB
–FS + 0.5 LSB
+FS – 1 LSB
+FS – 1.5 LSB
ANALOG INPUT
Figure 26. ADC Ideal Transfer Function
7V
REF1
10µF2
7V
0 TO VREF
3
–2V
33
2.7nF
4
REF
IN+
VDD
VIO
SDI
SCK
AD7685
SDO
IN–
GND
CNV
100nF
100nF
5V
1.8V TO VDD
3- OR 4-WIRE INTERFACE5
NOTES
1. SEE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2. CREF IS USUALLY A 10µF CERAMIC CAPACITOR (X5R).
3. SEE DRIVER AMPLIFIER CHOICE SECTION.
4. OPTIONAL FILTER. SEE ANALOG INPUT SECTION.
5. SEE DIGITAL INTERFACE FOR MOST CONVENIENT INTERFACE MODE.
Figure 27. Typical Application Diagram with Multiple Supplies
Table 8. Output Codes and Ideal Input Voltages
Description
Analog Input VREF = 5 V
FSR – 1 LSB
4.999924 V
Midscale + 1 LSB
2.500076 V
Midscale
2.5 V
Midscale – 1 LSB
2.499924 V
–FSR + 1 LSB
76.3 μV
–FSR
0V
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).
Digital Output Code Hexa
FFFF1
8001
8000
7FFF
0001
00002
Rev. C | Page 14 of 28
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