Rainbow Electronics MX7705 User Manual
Page 8
MX7705
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
8
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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