EVAL-AD7799EBZ View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

EVAL-AD7799EBZ

3-Channel, Low Noise, Low Power, 16-/24-Bit, Σ-Δ ADC with On-Chip In-Amp

Analog Devices

'EVAL-AD7799EBZ' PDF : 28 Pages View PDF

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Data Sheet
AD7799
Table 7 shows the AD7799 output rms noise for some update
rates and gain settings. The numbers given are for the bipolar
input range with a 2.5 V reference. These numbers are typical
and are generated with a differential input voltage of 0 V. Table 8
shows the effective resolution, and the output peak-to-peak
resolution is given in parentheses. Note that the effective
AD7798/AD7799
resolution is calculated using the rms noise, whereas the
peak-to-peak resolution is based on peak-to-peak noise. The
peak-to-peak resolution represents the resolution for which
there is no code flicker. These numbers are typical and are
rounded to the nearest LSB.
Table 7. Output RMS Noise (µV) vs. Gain and Output Update Rate for the AD7799 Using a 2.5 V Reference
Update Rate Gain of 1 Gain of 2
Gain of 4
Gain of 8
Gain of 16 Gain of 32 Gain of 64
4.17 Hz
0.64
0.6
0.185
0.097
0.075
0.035
0.027
8.33 Hz
1.04
0.96
0.269
0.165
0.108
0.048
0.037
16.7 Hz
1.55
1.45
0.433
0.258
0.176
0.085
0.065
33.2 Hz
2.3
2.13
0.647
0.364
0.24
0.118
0.097
62 Hz
2.95
2.85
0.952
0.586
0.361
0.178
0.133
123 Hz
4.89
4.74
1.356
0.785
0.521
0.265
0.192
242 Hz
11.76
9.5
3.797
2.054
1.027
0.476
0.326
470 Hz
11.33
9.44
3.132
1.773
1.107
0.5
0.413
Table 8. Typical Resolution (Bits) vs. Gain and Output Update Rate for the AD7799 Using a 2.5 V Reference
Update Rate Gain of 1 Gain of 2
Gain of 4
Gain of 8
Gain of 16 Gain of 32 Gain of 64
4.17 Hz
23 (20.5) 22 (19.5)
22.5 (20)
22.5 (20)
22 (19.5)
22 (19.5)
21.5 (19)
8.33 Hz
22 (19.5) 21.5 (19)
22 (19.5)
22 (19.5)
21.5 (19)
21.5 (19)
21 (18.5)
16.7 Hz
21.5 (19) 20.5 (18)
21.5 (19)
21 (18.5)
21 (18.5)
21 (18.5)
20 (17.5)
33.3 Hz
21 (18.5) 20 (17.5)
21 (18.5)
20.5 (18)
20.5 (18)
20.5 (18)
19.5 (17)
62 Hz
20.5 (18) 19.5 (17)
20.5 (18)
20 (17.5)
19.5 (17)
19.5 (17)
19 (16.5)
123 Hz
20 (17.5) 19 (16.5)
20 (17.5)
19.5 (17)
19 (16.5)
19 (16.5)
18.5 (16)
242 Hz
18.5 (16) 18 (15.5)
18.5 (16)
18 (15.5)
18 (15.5)
18.5 (16)
18 (15.5)
470 Hz
18.5 (16) 18 (15.5)
18.5 (16)
18.5 (16)
18 (15.5)
18.5 (16)
17.5 (15)
Gain of 128
0.027
0.040
0.065
0.094
0.134
0.192
0.308
0.374
Gain of 128
20.5 (18)
20 (17.5)
19 (16.5)
18.5 (16)
18 (15.5)
17.5 (15)
17 (14.5)
16.5 (14)
Rev. B | Page 11 of 28

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