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AD7798BRUZ-REEL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
AD7798/AD7799 Data Sheet
Rev. B | Page 10 of 28
OUTPUT NOISE AND RESOLUTION SPECIFICATIONS
AD7798
Table 5 shows the AD7798 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 6
shows the effective resolution, and the output peak-to-peak
resolution is shown in parentheses. It is important to note that
the effective resolution is calculated using the rms noise, whereas
the peak-to-peak resolution is based on the 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 5. Output RMS Noise (µV) vs. Gain and Output Update Rate for the AD7798 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 Gain of 128
4.17 Hz 0.64 0.6 0.29 0.22 0.1 0.065 0.039 0.041
8.33 Hz 1.04 0.96 0.38 0.26 0.13 0.078 0.057 0.055
16.7 Hz 1.55 1.45 0.54 0.36 0.18 0.11 0.087 0.086
33.2 Hz 2.3 2.13 0.74 0.5 0.23 0.17 0.124 0.118
62 Hz 2.95 2.85 0.92 0.58 0.29 0.2 0.153 0.144
123 Hz 4.89 4.74 1.49 1 0.48 0.32 0.265 0.283
242 Hz 11.76 9.5 4.02 1.96 0.88 0.45 0.379 0.397
470 Hz 11.33 9.44 3.07 1.79 0.99 0.63 0.568 0.593
Table 6. Typical Resolution (Bits) vs. Gain and Output Update Rate for the AD7798 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 Gain of 128
4.17 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16)
8.33 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16)
16.7 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16)
33.2 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16)
62 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (15.5)
123 Hz 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (16) 16 (15.5) 16 (14.5)
242 Hz 16 (16) 16 (15.5) 16 (15.5) 16 (15.5) 16 (16) 16 (16) 16 (15) 16 (14)
470 Hz
16 (16)
16 (15.5)
16 (16)
16 (16)
16 (15.5)
16 (15.5)
16 (14.5)
15.5 (13.5)
Data Sheet AD7798/AD7799
Rev. B | Page 11 of 28
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
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 Gain of 128
4.17 Hz 0.64 0.6 0.185 0.097 0.075 0.035 0.027 0.027
8.33 Hz 1.04 0.96 0.269 0.165 0.108 0.048 0.037 0.040
16.7 Hz 1.55 1.45 0.433 0.258 0.176 0.085 0.065 0.065
33.2 Hz 2.3 2.13 0.647 0.364 0.24 0.118 0.097 0.094
62 Hz 2.95 2.85 0.952 0.586 0.361 0.178 0.133 0.134
123 Hz 4.89 4.74 1.356 0.785 0.521 0.265 0.192 0.192
242 Hz 11.76 9.5 3.797 2.054 1.027 0.476 0.326 0.308
470 Hz 11.33 9.44 3.132 1.773 1.107 0.5 0.413 0.374
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 Gain of 128
4.17 Hz 23 (20.5) 22 (19.5) 22.5 (20) 22.5 (20) 22 (19.5) 22 (19.5) 21.5 (19) 20.5 (18)
8.33 Hz 22 (19.5) 21.5 (19) 22 (19.5) 22 (19.5) 21.5 (19) 21.5 (19) 21 (18.5) 20 (17.5)
16.7 Hz 21.5 (19) 20.5 (18) 21.5 (19) 21 (18.5) 21 (18.5) 21 (18.5) 20 (17.5) 19 (16.5)
33.3 Hz
21 (18.5)
20 (17.5)
21 (18.5)
20.5 (18)
20.5 (18)
20.5 (18)
19.5 (17)
18.5 (16)
62 Hz 20.5 (18) 19.5 (17) 20.5 (18) 20 (17.5) 19.5 (17) 19.5 (17) 19 (16.5) 18 (15.5)
123 Hz 20 (17.5) 19 (16.5) 20 (17.5) 19.5 (17) 19 (16.5) 19 (16.5) 18.5 (16) 17.5 (15)
242 Hz 18.5 (16) 18 (15.5) 18.5 (16) 18 (15.5) 18 (15.5) 18.5 (16) 18 (15.5) 17 (14.5)
470 Hz 18.5 (16) 18 (15.5) 18.5 (16) 18.5 (16) 18 (15.5) 18.5 (16) 17.5 (15) 16.5 (14)
AD7798/AD7799 Data Sheet
Rev. B | Page 12 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
8388640
8388630
8388620
8388610
8388600
8388590
8388580
0 200 400 600 800
999
04856-006
SAMPLES
CODE
Figure 6. AD7799 Noise (V
REF
= AV
DD
/2, Gain = 64, Update Rate = 4.17 Hz)
50
40
30
20
10
0
8388581
8388590
8388600
8388610
8388620
8388630
8388635
04856-007
CODE
OCCURRENCE
Figure 7. AD7799 Noise Distribution Histogram (V
REF
= AV
DD
/2,
Gain = 64, Update Rate = 4.17 Hz)
8388680
8388660
8388640
8388620
8388600
8388580
8388560
8388540
0 200
400 600 800 999
04856-008
SAMPLES
CODE
Figure 8. AD7799 Noise (V
REF
= AV
DD
/2, Gain = 64, Update Rate = 16.7 Hz)
30
25
20
15
10
5
0
8388549
8388560
8388580
8388600
8388620
8388640
8388669
04856-009
CODE
OCCURRENCE
Figure 9. AD7799 Noise Distribution Histogram (V
REF
= AV
DD
/2,
Gain = 64, Update Rate = 16.7 Hz)
3.0
2.5
2.0
1.5
1.0
0.5
0
0
0.5 1.0 1.5
2.0 2.5
3.0
3.5 4.0
4.5 5.0
04856-010
REFERENCE VOLTAGE (V)
RMS NOISE (
µV)
V
DD
= 5V
UPDATE RATE = 16.6Hz
T
A
= 25°C
Figure 10. RMS Noise vs. Reference Voltage (Gain = 1)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

AD7798BRUZ-REEL

Mfr. #:
Buy AD7798BRUZ-REEL
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 3-Ch 16-Bit Low Noise Low Power
Lifecycle:
New from this manufacturer.
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