Rainbow Electronics MX7705 User Manual
Page 10
MX7705
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
10
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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
1
2
4
8
16
32
64
128
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