MAX1401_02 Datasheet, PDF (26/36 Pages) Maxim Integrated Products – +3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC

+3V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
Table 15. Modulator Operating Frequency, Sampling Frequency, and 16-Bit Data
Output Rates
CLKIN FREQUENCY,
f_CLKIN (MHz)
X2CLK = 0
DEFAULT
X2CLK = 1
1.024
2.048
1.024
2.048
1.024
2.048
1.024
2.048
2.4576
4.9152
2.4576
4.9152
2.4576
4.9152
2.4576
4.9152
Note: Default condition is in bold print.
CLK
0
0
0
0
1
1
1
1
MF1
0
0
1
1
0
0
1
1
MF0
0
1
0
1
0
1
0
1
AIN/REFIN
SAMPLING
FREQUENCY,
f_S
(kHz)
16
32
64
128
38.4
76.8
153.6
307.2
MODULATOR
FREQUENCY,
f_M
(kHz)
8
16
32
64
19.2
38.4
76.8
153.6
AVAILABLE
OUTPUT
DATA RATES
AT 16-BIT
ACCURACY
(sps)
20, 25
40, 50
80, 100
160, 200
50, 60
100, 120
200, 240
400, 480
Table 16a. Noise vs. Gain and Output Data Rate—Unbuffered Mode, V_REF = 1.25V,
f_CLKIN = 2.4576MHz
OUTPUT
DATA
RATE
(sps)
-3dB
FREQ.
(Hz)
x1
50
13.1
5.42
60
15.7
5.91
300
78.6
80.5
600
157.2
441
100
120
600
1200
26.2
5.53
31.4
6.06
157.2
81.5
314.4
450
200
240
1200
2400
52.4
5.39
62.9
6.27
314.4
77.8
628.8
431
400
480
2400
4800
104.8
5.36
125.7
5.88
628.8
79.7
1258
441
TYPICAL OUTPUT NOISE (µV_RMS)
FOR VARIOUS PROGRAMMABLE GAINS
x2
x4
x8
x16
x32
x64
3.03
1.70
1.11
1.06
1.05
1.05
3.20
1.90
1.25
1.13
1.18
1.15
38.6
20.6
10.3
5.73
3.62
2.84
236
112
54.8
29.2
14.5
7.61
2.96
1.73
1.13
1.06
1.06
1.08
3.28
1.90
1.25
1.17
1.11
1.12
39.9
19.6
10.2
5.45
3.49
2.72
232
115
53.4
27.8
14.7
8.00
2.92
1.70
1.09
1.06
1.02
1.02
3.28
1.89
1.20
1.18
1.14
1.17
40.1
20.1
10.0
5.53
3.56
2.74
232
109
54.9
28.2
14.1
8.08
3.00
1.82
1.17
1.10
1.06
1.10
3.25
1.94
1.28
1.26
1.16
1.17
39.6
20.2
10.5
5.74
3.63
3.02
227
111
55.5
29.7
14.6
7.73
x128
1.04
1.15
2.67
5.13
1.05
1.11
2.59
5.08
1.03
1.11
2.59
4.99
1.11
1.15
2.76
5.43
BIT
STATUS
MF1:MF0 = 0
FS1:FS0 = 0
FS1:FS0 = 1
FS1:FS0 = 2
FS1:FS0 = 3
MF1:MF0 = 1
FS1:FS0 = 0
FS1:FS0 = 1
FS1:FS0 = 2
FS1:FS0 = 3
MF1:MF0 = 2
FS1:FS0 = 0
FS1:FS0 = 1
FS1:FS0 = 2
FS1:FS0 = 3
MF1:MF0 = 3
FS1:FS0 = 0
FS1:FS0 = 1
FS1:FS0 = 2
FS1:FS0 = 3
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