Datasheet

REV. 0
–18–
AD7708/AD7718
Table II. Typical Output RMS Noise vs. Input Range and Update Rate for AD7718 with Chop Enabled (CHOP = 0);
Output RMS Noise in ␮V
SF Data Update
Input Range
Word Rate (Hz) ⴞ20 mV ⴞ40 mV ⴞ80 mV ⴞ160 mV ⴞ320 mV ⴞ640 mV ⴞ1.28 V ⴞ2.56 V
13 105.3 1.50 1.50 1.60 1.75 3.50 4.50 6.70 11.75
23 59.36 1.0 1.02 1.06 1.15 1.22 1.77 3.0 5.08
27 50.56 0.95 0.95 0.98 1.00 1.10 1.66 5.0
69 19.79 0.60 0.65 0.65 0.65 0.65 0.95 1.40 2.30
255 5.35 0.35 0.35 0.37 0.37 0.37 0.51 0.82 1.25
Table III. Peak-to-Peak Resolution vs. Input Range and Update Rate for AD7718 with Chop Enabled (CHOP = 0);
Peak-to-Peak Resolution in Bits
SF Data Update
Input Range
Word Rate (Hz) ⴞ20 mV ⴞ40 mV ⴞ80 mV ⴞ160 mV ⴞ320 mV ⴞ640 mV ⴞ1.28 V ⴞ2.56 V
13 105.3 12 13 14 15 15 15.5 16 16
23 59.36 12.5 13.5 14.5 15 16 17 17 17
27 50.56 12.5 13.5 14.5 15.5 16.5 17 17 17
69 19.79 13 14 15 16 17 17.5 18 18.5
255 5.35 14 15 16 17 18 18.5 18.8 19.2
Table IV. Typical Output RMS Noise vs. Input Range and Update Rate for AD7708 with Chop Enabled ( CHOP = 0);
Output RMS Noise in ␮V
SF Data Update
Input Range
Word Rate (Hz) ⴞ20 mV ⴞ40 mV ⴞ80 mV ⴞ160 mV ⴞ320 mV ⴞ640 mV ⴞ1.28 V ⴞ2.56 V
13 105.3 1.50 1.50 1.60 1.75 3.50 4.50 6.70 11.75
23 59.36 1.0 1.02 1.06 1.15 1.22 1.77 3.0 5.08
27 50.56 0.95 0.95 0.98 1.00 1.10 1.66 5.0
69 19.79 0.60 0.65 0.65 0.65 0.65 0.95 1.40 2.30
255 5.35 0.35 0.35 0.37 0.37 0.37 0.51 0.82 1.25
Table V. Peak-to-Peak Resolution vs. Input Range and Update Rate for AD7708 with Chop Enabled (CHOP = 0);
Peak-to-Peak Resolution in Bits
SF Data Update
Input Range
Word Rate (Hz) ⴞ20 mV ⴞ40 mV ⴞ80 mV ⴞ160 mV ⴞ320 mV ⴞ640 mV ⴞ1.28 V ⴞ2.56 V
13 105.3 12 13 14 15 15 15.5 16 16
23 59.35 12.5 13.5 14.5 15 16 16 16 16
27 50.56 12.5 13.5 14.5 15.5 16 16 16 16
69 19.79 13 14 15 16 16 16 16 16
255 5.35 14 15 16 16 16 16 16 16