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AD4020 Datasheet(PDF) 19 Page - Analog Devices

Part # AD4020
Description  Precision SAR, Differential ADC
PDF  37 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD4020 Datasheet(HTML) 19 Page - Analog Devices

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AD4020
Data Sheet
Rev. A | Page 18 of 36
C
R
REF
VDD
VIO
GND
IN+
IN–
SDI
SCK
SDO
CNV
AD40202
1.8V
1.8V TO 5V
V+ = +5V
DIGITAL HOST
(MICROPROCESSOR/
FPGA)
HOST
SUPPLY
0.1µF
0.1µF
100nF
100nF
4.096V
C
R
AMP
AMP
VREF
0
VREF
0
VREF/2
VREF/2
REF1
LDO
AMP
VREF/2
10µF2
10kΩ
10kΩ
1SEE THE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.
2CREF IS USUALLY A 10µF CERAMIC CAPACITOR (X7R).
3SEE THE DRIVER AMPLIFIER CHOICE SECTION.
4SEE THE ANALOG INPUTS SECTION.
3-WIRE/4-WIRE
INTERFACE
3, 4
Figure 32. Typical Application Diagram with a Single Supply
10µF
REF
VDD
VIO
GND
IN+
IN–
SDI
SCK
SDO
CNV
AD4020
3-WIRE/4-WIRE
INTERFACE
1.8V
1.8V TO 5V
DIGITAL HOST
(MICROPROCESSOR/
FPGA)
4.096V
0.1µF
VOCM
R3
1kΩ
+IN
V+
–IN
–OUT
+OUT
R4
1kΩ
10kΩ
10kΩ
R2
1kΩ
R
R
DIFFERENTIAL
AMPLIFIER
R1
1kΩ
0.1µF
VREF/2
HOST
SUPPLY
V–
C
C
REF
V+ = +5V
LDO
AMP
VREF
0
VREF/2
VREF
0
VREF/2
0.1µF
VREF/2
Figure 33. Typical Application Diagram with a Fully Differential Amplifier



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