MAX1403_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
1.024
1.024
1.024
2.4576
2.4576
2.4576
2.4576
2.048
2.048
2.048
2.048
4.9152
4.9152
4.9152
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
26.2
5.53
120
31.4
6.06
600
157.2
81.5
1200
314.4
450
200
52.4
5.39
240
62.9
6.27
1200
314.4
77.8
2400
628.8
431
400
104.8
5.36
480
125.7
5.88
2400
628.8
79.7
4800
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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