Datasheet

MX7705
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
10 ______________________________________________________________________________________
Table 3. Output RMS Noise vs. Gain and Output Data Rate (V
DD
= 3V)
TYPICAL OUTPUT RMS NOISE (µV)
GAIN
FILTER FIRST
NOTCH AND
OUTPUT DATA RATE
-3dB FREQUENCY
1248163264128
BUFFERED (f
CLKIN
= 1MHz)
20Hz 5.24Hz 3.52 1.84 2.19 0.73 0.66 0.62 0.62 0.62
25Hz 6.55Hz 4.24 2.23 1.19 0.84 0.74 0.69 0.69 0.69
100Hz 26.2Hz 50.36 25.12 12.06 6.04 3.38 2.23 1.70 1.69
200Hz 52.4Hz 268.02 175.98 65.77 34.89 16.73 8.76 4.70 4.70
UNBUFFERED (f
CLKIN
= 1MHz)
20Hz 5.24Hz 3.58 1.92 1.13 0.72 0.66 0.64 0.61 0.62
25Hz 6.55Hz 4.16 2.27 1.27 0.83 0.74 0.70 0.69 0.67
100Hz 26.2Hz 50.48 23.89 12.10 5.90 3.26 0.70 1.66 1.63
200Hz 52.4Hz 256.43 135.78 65.62 33.18 16.65 8.47 4.66 4.68
BUFFERED (f
CLKIN
= 2.4576MHz)
50Hz 13.1Hz 2.84 1.68 2.00 0.71 0.67 0.65 0.63 0.61
60Hz 15.72Hz 3.27 1.84 1.12 0.78 0.75 0.70 0.68 0.67
250Hz 65.5Hz 47.90 24.43 12.56 6.48 3.45 2.32 1.64 1.66
500Hz 131Hz 281.03 104.19 69.58 34.59 17.44 9.20 5.16 4.92
UNBUFFERED (f
CLKIN
= 2.4576MHz)
50Hz 13.1Hz 3.04 1.74 1.03 0.72 0.64 0.64 0.62 0.63
60Hz 15.72Hz 3.35 1.80 1.13 0.81 0.73 0.69 0.67 0.68
250Hz 65.5Hz 49.63 23.82 13.03 6.23 3.42 2.22 1.68 1.65
500Hz 131Hz 279.13 134.82 69.47 35.42 17.47 9.55 4.90 5.18