AD7621 datasheet(17/32 Pages) AD

17 / 32 page

AD7610

Rev. 0 | Page 17 of 32

TRANSFER FUNCTIONS

Using the OB/2C digital input or via the configuration register,

the AD7610 offers two output codings: straight binary and twos

complement. See Figure 26 and Table 7 for the ideal transfer char-

acteristic and digital output codes for the different analog input

ranges, VIN. Note that when using the configuration register, the

OB/2C input is a don’t care and should be tied to either high or low.

000...000

000...001

000...010

111...101

111...110

111...111

ANALOG INPUT

+FSR – 1.5 LSB

+FSR – 1 LSB

–FSR + 1 LSB

–FSR

–FSR + 0.5 LSB

Figure 26. ADC Ideal Transfer Function

Table 7. Output Codes and Ideal Input Voltages

VREF = 5 V

Digital Output Code

Description

VIN = 5 V

VIN = 10 V

VIN = ±5 V

VIN = ±10 V

Straight Binary

Twos Complement

FSR −1 LSB

4.999924 V

9.999847 V

+4.999847 V

+9.999695 V

0xFFFF1

0x7FFF1

FSR − 2 LSB

4.999847 V

9.999695 V

+4.999695 V

+9.999390 V

0xFFFE

0x7FFE

Midscale + 1 LSB

2.500076 V

5.000153 V

+152.6 μV

+305.2 μV

0x8001

0x0001

Midscale

2.5 V

5.000000 V

0 V

0x8000

0x0000

Midscale − 1 LSB

2.499924 V

4.999847 V

−152.6 μV

−305.2 μV

0x7FFF

0xFFFF

−FSR + 1 LSB

76.3 μV

152.6 μV

−4.999847 V

−9.999695 V

0x0001

0x8001

−FSR

0 V

−5 V

−10 V

0x00002

0x80002

1 This is also the code for overrange analog input (VIN+ − VIN− above VREF − VREFGND).

2 This is also the code for overrange analog input (VIN+ − VIN− below VREF − VREFGND).

AD7621 データシート(PDF) 17 Page - Analog Devices

AD7621 データシート(HTML) 17 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

データシートダウンロード