EVAL-AD7983SDZ(RevB) Просмотр технического описания (PDF) - Analog Devices

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EVAL-AD7983SDZ
(Rev.:RevB)

16-Bit, 1.33 MSPS PulSAR ADC in MSOP/QFN

Analog Devices 

Data Sheet

Transfer Functions

The ideal transfer characteristic for the AD7983 is shown in

Figure 22 and Table 7.

111 ... 111

111 ... 110

111 ... 101

000 ... 010

000 ... 001

000 ... 000

–FSR –FSR + 1LSB

–FSR + 0.5LSB

+FSR – 1 LSB

+FSR – 1.5 LSB

ANALOG INPUT

Figure 22. ADC Ideal Transfer Function

AD7983

Table 7. Output Codes and Ideal Input Voltages

Analog Input

Description

VREF = 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

0V

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 23 shows an example of the recommended connection

diagram for the AD7983 when multiple supplies are available.

0 TO VREF

V+

V+

REF1

10µF2

20Ω

2.7nF

V–

4

REF

IN+

VDD

VIO SDI

SCK

AD7983

SDO

IN–

GND

CNV

2.5V

100nF

1.8V TO 5V

100nF

3- OR 4-WIRE INTERFACE

1SEE THE VOLTAGE REFERENCE INPUT SECTION FOR REFERENCE SELECTION.

2CREF IS USUALLY A 10µF CERAMIC CAPACITOR (X5R).

3SEE THE DRIVER AMPLIFIER CHOICE SECTION.

4OPTIONAL FILTER. SEE THE ANALOG INPUTS SECTION.

5SEE THE DIGITAL INTERFACE SECTION FOR THE MOST CONVENIENT INTERFACE MODE.

Figure 23. Typical Application Diagram with Multiple Supplies

Rev. B | Page 13 of 24

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