AD7796BRUZ-REEL datasheet(9/24 Pages) AD

Part #	AD7796BRUZ-REEL

Description	Low Power, 16-/24-Bit Sigma-Delta ADC for Bridge Sensors

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Manufacturer	AD [Analog Devices]

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9 / 24 page

AD7796/AD7797

Rev. A | 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 brackets. 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

10

0.09

12.5

0.1

16.7

0.12

33.2

0.17

50

0.21

62

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)

10

18.5 (16)

12.5

18.5 (16)

16.7

18.5 (15.5)

33.2

18 (15)

50

17.5 (15)

62

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)

10

16 (16)

12.5

16 (16)

16.7

16 (15.5)

33.2

16 (15)

50

16 (15)

62

16 (14.5)

123

16 (13.5)

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