EVAL-AD7986EBZ Analog Devices Inc, EVAL-AD7986EBZ Datasheet - Page 14
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EVAL-AD7986EBZ
Manufacturer Part Number
EVAL-AD7986EBZ
Description
18-Bit A/D Converter Eval. Board
Manufacturer
Analog Devices Inc
Series
PulSAR®r
Datasheet
1.AD7986BCPZ.pdf
(28 pages)
Specifications of EVAL-AD7986EBZ
Silicon Manufacturer
Analog Devices
Application Sub Type
ADC
Kit Application Type
Data Converter
Silicon Core Number
AD7986
Kit Contents
Board
Number Of Adc's
1
Number Of Bits
18
Sampling Rate (per Second)
2M
Data Interface
Serial
Inputs Per Adc
1 Differential
Input Range
±VREF
Power (typ) @ Conditions
29mW @ 2MSPS
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
AD7986
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
AD7986
Transfer Functions
The ideal transfer characteristic for the AD7986 is shown in
Figure 22 and Table 7.
011 ... 101
100 ... 010
100 ... 001
100 ... 000
011 ... 111
011 ... 110
–FSR + 0.5 LSB
–FSR
Figure 22. ADC Ideal Transfer Function
V
NOTES
1. GND REFERS TO REFGND, AGND, AND DGND.
0V TO V
REF
–FSR + 1 LSB
TO 0V
REF
ANALOG INPUT
V+
V+
V–
V–
+FSR – 1.5 LSB
2.7nF
2.7nF
15Ω
15Ω
+FSR – 1 LSB
Figure 23. Typical Application Diagram with Multiple Supplies
Rev. B | Page 14 of 28
IN+
IN–
10µF
BVDD
5V
AD7986
REF
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 AD7986 when multiple supplies are available.
This is also the code for an overranged analog input (V
This is also the code for an underranged analog input (V
AVDD,
DVDD
REFGND).
2.5V
GND
DD VIO
1
1.8V TO 2.7V
TURBO
SCLK
SDO
CNV
SDI
VIO
Analog Input
V
+4.095969 V
+31.25 µV
0 V
−31.25 µV
−4.095969 V
−4.096 V
3- OR 4-WIRE
INTERFACE:
SPI, CS
DAISY CHAIN (TURBO = LOW)
REF
= 5 V
IN+
IN+
Digital Output
Code (Hex)
0x1FFFF
0x00001
0x00000
0x3FFFF
0x20001
0x20000
− V
− V
IN−
IN−
above V
below REFGND).
1
2
REF
−