AD7796 datasheet(9/24 Pages) AD

9 / 24 page

Data Sheet

AD7796/AD7797

Rev. B | Page 9 of 24

RMS NOISE AND RESOLUTION SPECIFICATIONS

Table 6 shows the rms noise of the AD7796/AD7797 for some

of the update rates. The numbers given are for the bipolar input

range with an external 2.5 V reference. These numbers are typical

and are generated with a differential input voltage of 0 V. Table 7

and Table 8 show the effective resolution, while the output

peak-to-peak (p-p) resolution is shown in parentheses. It is

important to note that the effective resolution is calculated using

the rms noise, while the p-p resolution is based on the p-p

noise. The p-p resolution represents the resolution for which

there is no code flicker. These numbers are typical and are

rounded to the nearest 0.5 LSB.

Table 6. RMS Noise (µV) vs. Output Update Rate for the

AD7796/AD7797 Using a 2.5 V Reference

Update Rate (Hz)

RMS Noise (µV)

4.17

0.065

6.25

0.07

8.33

0.08

0.09

12.5

0.1

16.7

0.12

33.2

0.17

0.21

0.23

123

0.43

Table 7. Typical Resolution (Bits) vs. Output Update Rate for

the AD7797 Using a 2.5 V Reference

Update Rate (Hz)

Effective Bits (p-p)

4.17

19 (16.5)

6.25

19 (16.5)

8.33

19 (16)

18.5 (16)

12.5

18.5 (16)

16.7

18.5 (15.5)

33.2

18 (15)

17.5 (15)

17.5 (14.5)

123

16.5 (13.5)

Table 8. Typical Resolution (Bits) vs. Output Update Rate for

the AD7796 Using a 2.5 V Reference

Update Rate (Hz)

Effective Bits (p-p)

4.17

16 (16)

6.25

16 (16)

8.33

16 (16)

12.5

16 (16)

16.7

16 (15.5)

33.2

16 (15)

16 (14.5)

123

16 (13.5)

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