AD4697 datasheet(29/107 Pages) AD

29 / 107 page

Data Sheet

AD4697/AD4698

THEORY OF OPERATION

analog.com

Rev. 0 | 29 of 107

Table 9. Output Codes and Ideal Input Voltages, VREF = 5 V, OSR = 1

Description

Input Voltage in

Unipolar Mode

Digital Output Code (Straight

Binary)

Input Voltage in Pseudobipolar

Mode

Digital Output Code (Twos Complement)

FSR − 1 LSB

4.999924 V

0xFFFF

+2.499924 V

0x7FFF

Midscale + 1 LSB

2.500076 V

0x8001

+76.3 µV

0x0001

Midscale

2.5 V

0x8000

0 V

0x0000

Midscale − 1 LSB

2.499924 V

0x7FFF

−76.3 µV

0xFFFF

−FSR + 1 LSB

76.3 µV

0x0001

−2.499924 V

0x8001

−FSR

0 V

0x0000

−2.5 V

0x8000

Table 10. Output Codes and Ideal Input Voltages, VREF = 5 V, OSR = 4

Description

Input Voltage in Unipolar

Mode

Digital Output Code (Straight

Binary)

Input Voltage in Pseudobipolar

Mode

Digital Output Code (Twos Complement)

FSR − 1 LSB

4.999962 V

0x1FFFF

+2.499962 V

0x0FFFF

Midscale + 1 LSB

2.500038 V

0x10001

+38.1 µV

0x00001

Midscale

2.5 V

0x10000

0 V

0x00000

Midscale − 1 LSB

2.499962 V

0x0FFFF

−38.1 µV

0x1FFFF

−FSR + 1 LSB

38.1 µV

0x00001

−2.499962 V

0x10001

−FSR

0 V

0x00000

−2.5 V

0x10000

Table 11. Output Codes and Ideal Input Voltages, VREF = 5 V, OSR = 16

Description

Input Voltage in Unipolar

Mode

Digital Output Code (Straight

Binary)

Input Voltage in Pseudobipolar

Mode

Digital Output Code (Twos Complement)

FSR − 1 LSB

4.999981 V

0x3FFFF

+2.499981 V

0x1FFFF

Midscale + 1 LSB

2.500019 V

0x20001

+19.1 µV

0x00001

Midscale

2.5 V

0x20000

0 V

0x00000

Midscale − 1 LSB

2.499981 V

0x1FFFF

−19.1 µV

0x3FFFF

−FSR + 1 LSB

19.1 µV

0x00001

−2.499981 V

0x20001

−FSR

0 V

0x000004

−2.5 V

0x20000

Table 12. Output Codes and Ideal Input Voltages, VREF = 5 V, OSR = 64

Description

Input Voltage in Unipolar

Mode

Digital Output Code (Straight

Binary)

Input Voltage in Pseudobipolar

Mode

Digital Output Code (Twos Complement)

FSR − 1 LSB

4.999910 V

0x7FFFF

+2.499990 V

0x3FFFF

Midscale + 1 LSB

2.500010 V

0x40001

+9.54 µV

0x00001

Midscale

2.5 V

0x40000

0 V

0x00000

Midscale − 1 LSB

2.499990 V

0x3FFFF

−9.54 µV

0x7FFFF

−FSR + 1 LSB

9.54 µV

0x00001

−2.499990 V

0x40001

−FSR

0 V

0x000004

−2.5 V

0x40000

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