Datasheet
AD7193 Data Sheet
Rev. D | Page 18 of 56
RMS NOISE AND RESOLUTION
The following tables show the rms noise, peak-to-peak noise,
effective resolution, and noise free (peak-to-peak) resolution of
the AD7193 for various output data rates and gain settings with
chop disabled for the sinc
4
and sinc
3
filters and for fast settling
mode. The numbers given are for the bipolar input range with
an external 5 V reference. These numbers are typical and are
generated with a differential input voltage of 0 V when the ADC
is continuously converting on a single channel. It is important
to note that the effective resolution is calculated using the rms
noise, whereas the peak-to-peak resolution is calculated based
on peak-to-peak noise. The peak-to-peak resolution represents
the resolution for which there is no code flicker. With chop
enabled, the resolution improves by 0.5 bits.
SINC
4
CHOP DISABLED
Table 7. RMS Noise (nV) vs. Gain and Output Data Rate
Filter Word
(Decimal)
Output Data
Rate (Hz)
Settling
Time (ms)
Gain of
1 8 16 32 64 128
1023 4.7 852.5 340 53 34 18 12 11
640 7.5 533 410 67 40 24 14 13
480 10 400 460 76 45 28 16 15
96 50 80 950 150 80 50 37 31
80 60 66.7 1000 160 90 54 40 35
32
150
26.7
1600
250
140
83
63
55
16 300 13.3 2300 340 190 120 90 79
5 960 4.17 4200 610 350 210 160 140
2 2400 1.67 7100 1000 570 350 260 230
1 4800 0.83 26,000 3400 1700 910 530 380
Table 8. Peak-to-Peak Noise (nV) vs. Gain and Output Data Rate
Filter Word
(Decimal)
Output Data
Rate (Hz)
Settling
Time (ms)
Gain of
1 8 16 32 64 128
1023 4.7 852.5 2200 340 190 110 70 65
640 7.5 533 2700 410 230 130 90 85
480 10 400 3000 450 260 150 100 95
96 50 80 6000 890 500 320 230 200
80 60 66.7 6600 1000 560 350 250 220
32 150 26.7 10,000 1500 920 540 400 370
16 300 13.3 14,000 2200 1300 800 600 530
5 960 4.17 28,000 4100 2400 1400 1000 900
2 2400 1.67 49,000 7000 3800 2400 1800 1700
1 4800 0.83 175,000 23,000 12,000 6100 3500 2600
Table 9. Effective Resolution (Peak-to-Peak Resolution) vs. Gain and Output Data Rate
Filter Word
(Decimal)
Output Data
Rate (Hz)
Settling
Time (ms)
Gain of
1
1 8 16 32 64 128
1023 4.7 852.5 24 (22.1) 24 (21.8) 24 (21.6) 24 (21.4) 23.6 (21.1) 22.8 (20.2)
640 7.5 533 24 (21.8) 24 (21.5) 23.9 (21.4) 23.6 (21.2) 23.4 (20.7) 22.5 (19.8)
480 10 400 24 (21.7) 24 (21.4) 23.7 (21.2) 23.4 (21) 23.2 (20.6) 22.3 (19.6)
96 50 80 23.3 (20.7) 23 (20.4) 22.9 (20.3) 22.6 (19.9) 22 (19.4) 21.3 (18.6)
80
60
66.7
23.3 (20.5)
22.9 (20.3)
22.8 (20.1)
22.5 (19.8)
21.9 (19.3)
21.1 (18.4)
32 150 26.7 22.6 (19.9) 22.3 (19.7) 22.1 (19.4) 21.8 (19.1) 21.2 (18.6) 20.4 (17.7)
16 300 13.3 22.1 (19.4) 21.8 (19.1) 21.6 (18.9) 21.3 (18.6) 20.7 (18) 19.9 (17.2)
5 960 4.17 21.2 (18.4) 21 (18.2) 20.8 (18) 20.5 (17.8) 19.9 (17.3) 19.1 (16.4)
2 2400 1.67 20.4 (17.6) 20.3 (17.4) 20.1 (17.3) 19.8 (17) 19.2 (16.4) 18.4 (15.5)
1 4800 0.83 18.6 (15.8) 18.5 (15.7) 18.5 (15.7) 18.4 (15.6) 18.2 (15.4) 17.6 (14.9)
1
The output peak-to-peak (p-p) resolution is listed in parentheses.