Datasheet

MX7705
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
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Table 1. Output RMS Noise vs. Gain and Output Data Rate (V
DD
= 5V)
TYPICAL OUTPUT RMS NOISE (µV)
GAIN
FILTER FIRST
NOTCH AND
OUTPUT DATA RATE
-3dB FREQUENCY
1 2 4 8 16 32 64 128
BUFFERED (f
CLKIN
= 1MHz)
20Hz 5.24Hz 4.44 2.28 1.29 0.79 0.70 0.70 0.64 0.63
25Hz 6.55Hz 5.11 2.79 1.55 0.92 0.81 0.80 0.73 0.74
100Hz 26.2Hz 102.35 49.59 23.04 11.78 6.32 3.63 2.25 2.24
200Hz 52.4Hz 586.93 272.83 224.79 70.78 33.94 17.57 9.14 9.22
UNBUFFERED (f
CLKIN
= 1MHz)
20Hz 5.24Hz 4.32 2.50 1.35 0.81 0.73 0.70 0.64 0.64
25Hz 6.55Hz 5.16 2.85 1.63 0.96 0.83 0.81 0.74 0.74
100Hz 26.2Hz 105.78 49.86 24.67 12.16 6.42 3.80 2.22 2.23
200Hz 52.4Hz 526.60 260.51
132.16
67.25 34.09 18.20 8.95 9.08
BUFFERED (f
CLKIN
= 2.4576MHz)
50Hz 13.1Hz 3.53 1.86 1.09 0.73 0.72 0.71 0.67 0.66
60Hz 15.72Hz 4.41 2.23 1.29 0.83 0.79 0.77 0.72 0.73
250Hz 65.5Hz 99.66 46.85 16.98 12.48 6.38 3.78 2.32 2.35
500Hz 131Hz 608.86 288.39 110.80 67.51 36.75 17.98 9.43 9.40
UNBUFFERED (f
CLKIN
= 2.4576MHz)
50Hz 13.1Hz 3.65 1.94 1.17 0.79 0.70 0.69 0.66 0.65
60Hz 15.72Hz 4.56 2.41 1.32 0.87 0.80 0.79 0.71 0.74
250Hz 65.5Hz 101.56 49.64 25.39 12.92 6.65 3.69 2.36 2.36
500Hz 131Hz 556.06 278.91 142.88 74.78 35.41 18.99 9.80 9.44